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Water Quality Control Division Public Notice No. CO-03-2022

Water Quality Control Division Public Notice No. CO-03-2022 (0)

Water Quality Control Division

Public Notice No. CO-03-2022

This email notifies parties of a permit action that is available for public comment. A summary page of permits at public notice can be found on the Public Notice Information webpage.

View Public Notice Summary

Original publication 03/10/22

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Water Quality Control Division | 4300 Cherry Creek S Dr, Denver, CO 80246

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WQCD PUBLIC NOTICE 3-10-2022 Enforcement settlement/Penalty Action

WQCD PUBLIC NOTICE 3-10-2022 Enforcement settlement/Penalty Action (0)

This email is to notify parties of a permit action that is available for public comment. A summary page of permits at public notice for this month is attached.  All documents for the permits can be accessed at the Public Notice Information Page by close of business today

To solicit public comment on the February 16, 2022 Notice of Violation/ Cease and Desist Order/ Order for Civil Penalty issued to TDA Construction, Inc. This penalty order was issued in response to TDA Construction, Inc’s violations of the Colorado Water Quality Control Act and a discharge permit. TDA Construction, Inc operated a planned construction dewatering project located in Rio Blanco County, Colorado. Division Contact: Marah Green, 720-260-4158 / marah.green@state.co.us

VIOLATION/CEASE AND DESIST ORDER DOCUMENT

Documents related to the above enforcement actions are available for public inspection at the Division. Public comments should be submitted by April 11, 2022 and directed to CDPHE, WQCD-CWE-B2, 4300 Cherry Creek Drive South, Denver, CO 80246-1530

Debbie Jessop

Technical Support Work Group Lead
Permits Unit

P 303.692.3517 Press 0 for immediate assistance 

4300 Cherry Creek Dr S B2 

Denver CO 80246

 debbie.jessop@state.co.us www.coloradowaterpermits.com

24-hr Environmental Release/Incident Report Line: 1.877.518.5608
 Total Coliform Positive: 303.692.3308

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Water Quality Control Division

Public Notice No. CO-11-2022

This email notifies parties of a permit action that is available for public comment. A summary page of permits at public notice can be found on the Public Notice Information webpage.

View Public Notice Summary

Original publication 11/10/22

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Monday, 14 November 2022 08:29

Direct Potable Reuse (DPR) Policy Feedback

Written by

Direct Potable Reuse (DPR) Policy Feedback

Invitation to provide feedback no later than Dec. 9, 2022.

On October 11, 2022, the Water Quality Control Commission unanimously took preliminary action approving the addition of the Direct Potable Reuse (DPR) Rule within the Colorado Primary Drinking Water Regulations (Regulation 11). This is an incredible achievement and the division would like to acknowledge and thank stakeholders for their enormous contributions to this effort.

One key comment received during the formal commission rulemaking process was to clarify the environmental buffer component of the rule. This was accomplished by adding language to the Statement of Basis and Purpose within the regulation and making minor edits to language in section 4.10 of the DPR Policy.

Opportunity to comment

A DPR Policy and an Enhanced Source Control Policy are associated with the DPR Rule. The division would like the stakeholder community to review the minor edits to the DPR Policy and provide any feedback about the proposed changes. The division is also taking this opportunity to consider whether other minor clarifications to the policies are warranted in light of the Commission's adoption of the rule. The division will not consider large rewrites of any portions of the policies as part of this process.

Please provide comments no later than Friday, Dec. 9, 2022.

Provide feedback no later than Dec. 9, 2022

Next steps

The division does not intend to hold a stakeholder meeting about these policy updates. However, the division is requesting feedback from stakeholders about the need or desire to have an additional stakeholder meeting to review the proposed changes and feedback received. Should the stakeholder feedback indicate that a meeting may be beneficial, the division will schedule a meeting in December. 

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For more information, visit our Direct Potable Reuse webpage

Contact

For questions or comments about the direct potable reuse rulemaking process, email Tyson Ingels at This email address is being protected from spambots. You need JavaScript enabled to view it.

For questions or comments about the engagement process, email This email address is being protected from spambots. You need JavaScript enabled to view it..

cdphe.colorado.gov/water-quality

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Attention: funding opportunity

Assistance grants program is currently accepting applications

The Water Quality Control Division's assistance grants program is currently accepting applications. This program provides financial assistance for drinking water systems that need help reaching or exceeding compliance requirements or addressing a water quality challenge. All drinking water systems and projects are eligible to apply. More information on the program is available on this document.

This program offers grant funds of up to $25,000 for projects that can be completed by the end of 2023. If your system would benefit from this funding, please use the button below to apply by November 25, 2022, at 5:00 pm.

Apply here!

Please feel free to send this opportunity to other water systems that may benefit.

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You can update your preferences at any time using the link at the bottom of this email.

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Email specific questions to

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Colorado Discharge Permit System (CDPS)

Fact Sheet for Modification 3

General Permit Number COG591000 

 

DOMESTIC WASTEWATER TREATMENT FACILITIES THAT DISCHARGE TO RECEIVING WATERS THAT ARE:

UNCLASSIFIED; USE-PROTECTED; REVIEWABLE; OR ARE DESIGNATED

AS THREATENED AND ENDANGERED HABITAT

 

Kelly Drengler

August 11, 2022

 

TABLE OF CONTENTS

 

I.  TYPE OF PERMIT.......................................................................... 1

II.  FACILITY INFORMATION............................................................... 1

III.  CHANGES MADE AS A RESULT OF THE MINOR MODIFICATION......... 2

 

 

I.        TYPE OF PERMIT

  1. Type of Modification: General Permit, Modification 3 - Minor Amendment,

Division-Initiated (no fee)

 

  1. Discharge To:          Surface Water 

II.        FACILITY INFORMATION

  1. SIC Code:                               4952 Sewerage Systems
  1. Facility Flows:                    Less than 1.0 MGD

C.    Facilities and Discharges Covered

 

General Permit COG591000 (the general permit) authorizes discharges from domestic wastewater treatment plants as defined in Regulation 22 (5 CCR 1002-22): Site Location and Design Approval Regulations for Domestic Wastewater Treatment Works. The general permit also authorizes domestic discharges from facilities that accept industrial waste that are not required to develop an industrial pretreatment program pursuant to either Section 307 of the federal Clean Water Act or Section 63.9 of Regulation No. 63 (5 CCR 1002-63): Pretreatment Regulations. The general permit authorizes direct discharges to surface water and discharges to surface water via hydrologically connected groundwater. The applicant must meet all of the qualifications in Part I.A.3 of the general permit in order to qualify for coverage. 

For the purposes of this general permit, dischargers to surface water via hydrologically connected groundwater include dischargers that the division has determined must obtain surface water discharge permit coverage. This may include dischargers that were previously covered under a groundwater discharge permit and have been determined to be discharges to surface water and applied for coverage under a surface water discharge permit. 

 

 

 

III.        CHANGES MADE AS A RESULT OF THE MINOR MODIFICATION

The division initiated a minor modification on July 18, 2022 to clarify several sections in Parts 1.B.2-6 of the permit, and to reorganize the remaining sections. This minor modification also is intended to to address new information, in accordance with 5 CCR 1002-61, Reg. 61.8(8)(b)(ii). 

  1. A typographical correction to Tables 2a – 2d have been made, in accordance with Regulation 61.8(8)(f)(i), to include a To Be Determined (TBD) designation for “Other Pollutants” in the 2-year Avg column since these unspecified parameters may also be subject to antidegradation limits.
  1. A clarification in Part I.B.3 of the permit is needed so that Table 2e – EPA Recommended Periodic Pollutant Monitoring and associated text, may be applied to all certifications under the

COG591000 General Permit, and not just the Classified Water Discharges. Therefore,Table 2e and associated text became Part I.B.5 (EPA Pollutant Monitoring) of the permit. Table 2e – EPA Recommended Periodic Pollutant Monitoring became Table 8 (EPA Recommended Periodic Pollutant Monitoring).

  1. Another clarification in Part I.B.3 of the permit is needed so that monitoring requirements for PFAS may be applied to all certifications under the GOG591000 General Permit, and not just the classified Water Discharges. PFAS monitoring details from Part I.B.3 were moved to a new part of the permit - Part I.B.6 (PFAS Monitoring). Additional changes to the PFAS monitoring requirements are explained below in Part III.E of this fact sheet.
  1. The sections and tables following newly created I.B.4 and I.B.5 and Table 8 in the Permit Document have been renumbered due to the clarifications and reorganization discussed in modifications A and B above.
  1. The division has learned that Method DoD QSM has been updated. A reference to “Method DoD QSM 5.1 or later,” was included in the COG591000 General Permit (issued date of April 30, 2022).

The most recent version of the DoD QSM is version 5.4, which was revised to incorporate EPA Draft Method 1633. Consistent with the current version of the DoD QSM method, Part I.E.5.f of the permit has been updated to require compliance with EPA Draft Method 1633.  Requiring the use of Draft Method 1633 is also consistent with Policy 20-1, which states in part (page 6):

The laboratory selected should be able to perform analysis on wastewater (nonpotable) matrices using a method that is compliant with the requirements set forth in the Department of Defense (DoD) Quality Systems Manual (QSM) for Environmental Laboratories   

Additionally, see Policy 20-1 (page 6). In its citation for the DoD QSM, Policy 20-1 states “please refer to the most up-to-date version available.”  Id. at 6 n.3. As noted in Policy 20-1, it was the Commission’s intent to require permittees use a method that is compliant with the requirements set forth in the most recent version of the Department of Defense (DoD) Quality Systems Manual (QSM) for Environmental Laboratories. 

As stated above, the most recent version of the DoD QSM (version 5.4) was revised to incorporate EPA Draft Method 1633. Therefore, EPA Draft Method 1633 is the currently required laboratory method.

EPA Draft Method 1633 currently tests 40 PFAS parameters. However, the General Permit

COG591000, issued on April 30, 2022, subsequently modified on June 2 and July 14, 2022, only listed the 25 parameters required by the method that was current at the time the permit was issued. Therefore, to ensure that facilities have all of the required parameters listed in the permit tables, and provided on DMRs and consistent with EPA Draft Method 1633, the division has removed Permit Table 2f (PFAS Monitoring Requirements) in Part I.B.2 of the permit, and has included the updated table below. 

 

PFAS Monitoring Requirements

ICIS

Code

Effluent Parameter

Monitoring Requirements

Frequency

Sample Type

51521

Perfluorooctanoic Acid [PFOA], ng/l

1/Permit Term

Grab

51522

Perfluorobutanoic Acid [PFBA], ng/l

1/Permit Term

Grab

51525

Perfluorooctanesulfonamide [PFOSA (or FOSA)], ng/l

1/Permit Term

Grab

51623

Perfluoropentanoic acid [PFPeA], ng/l

1/Permit Term

Grab

51624

Perfluorohexanoic acid [PFHxA], ng/l

1/Permit Term

Grab

51625

Perfluoroheptanoic acid [PFHpA], ng/l

1/Permit Term

Grab

51626

Perfluorononanoic acid [PFNA], ng/l

1/Permit Term

Grab

51627

Perfluorodecanoic acid [PFDA], ng/l

1/Permit Term

Grab

51628

Perfluoroundecanoic acid [PFUnA (or PFUdA)], ng/l

1/Permit Term

Grab

51629

Perfluorododecanoic acid [PFDoA], ng/l

1/Permit Term

Grab

51630

Perfluorotridecanoic acid [PFTrDA (or RFTriA)], ng/l

1/Permit Term

Grab

51631

Perfluorotetradecanoic acid [PFTeDA (or PFTA or PFTeA)], ng/l

1/Permit Term

Grab

51643

2-[N-ethylperfluorooctanesulfonamido] acetic acid [NEtFOSAA], ng/l

1/Permit Term

Grab

51644

2-[N-methylperfluorooctanesulfonamido] acetic acid [NMeFOSAA], ng/l

1/Permit Term

Grab

52602

Perfluorobutanesulfonic acid [PFBS], ng/l

1/Permit Term

Grab

52603

Perfluorodecanesulfonic acid [PFDS], ng/l

1/Permit Term

Grab

52604

Perfluoroheptanesulfonic acid [PFHpS], ng/l

1/Permit Term

Grab

52605

Perfluorohexanesulfonic acid [PFHxS], ng/l

1/Permit Term

Grab

52606

Perfluorooctanesulfonic acid [PFOS], ng/l

1/Permit Term

Grab

52607

4:2 Fluorotelomer sulfonic acid [4:2 FTS], ng/l

1/Permit Term

Grab

52608

6:2 Fluorotelomer sulfonic acid [6:2 FTS], ng/l

1/Permit Term

Grab

52609

8:2 Fluorotelomer sulfonic acid [8:2 FTS], ng/l

1/Permit Term

Grab

52610

Perfluoropentane sulfonic acid [PFPeS], ng/l

1/Permit Term

Grab

52611

Perfluorononane sulfonic acid [PFNS], ng/l

1/Permit Term

Grab

52612

Hexafluoropropylene oxide dimer acid [Gen-X (or HFPO-DA or HPFA-DA], ng/l

1/Permit Term

Grab

52632

Perfluorododecanesulfonic acid [PFDoS], ng/L

1/Permit Term

Grab

52641

N-methyl perfluorooctanesulfonamide [NMeFOSA], ng/L

1/Permit Term

Grab

52642

N-ethyl perfluorooctanesulfonamide [NEtFOSA], ng/L

1/Permit Term

Grab

51642

N-methyl perfluorooctanesulfonamidoethanol [NMeFOSE], ng/L

1/Permit Term

Grab

51641

N-ethyl perfluorooctanesulfonamidoethanol [NEtFOSE], ng/L

1/Permit Term

Grab

             

52636

4,8-Dioxa-3H-perfluorononanoic acid [ADONA], ng/L

1/Permit Term

Grab

52629

Perfluoro(2-ethoxyethane)sulfonic acid [PFEESA], ng/L

1/Permit Term

Grab

52624

Perfluoro-3-methoxypropanoic acid [PFMPA], ng/L

1/Permit Term

Grab

52638

9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid [9CL-PF3ONS], ng/L

1/Permit Term

Grab

52639

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid [11CL-PF3OUDS], ng/L

1/Permit Term

Grab

**

Perfluoro-4-methoxybutanoic acid [PFMBA], ng/L

1/Permit Term

Grab

52626

Nonafluoro-3,6-dioxaheptanoic acid [NFDHA], ng/L

1/Permit Term

Grab

**

3-Perfluoropropyl propanoic acid [3:3 FTCA], ng/L

1/Permit Term

Grab

**

2H,2H,3H,3H-Perfluorooctanoic acid [5:3 FTCA], ng/L

1/Permit Term

Grab

**

3-Perfluoroheptyl propanoic acid [7:3 FTCA], ng/L

1/Permit Term

Grab

87006

PFAS Sum, ng/l*

1/Permit Term

Calculated

ng/L = nanograms per liter

*The PFAS sum is calculated based on the following equation: 

 

PFAS Sum (ng/l) = [PFOA] (ng/l) + [PFOSA] (ng/l) + [PFNA] (ng/l) + ([NEtFOSAA] (ng/l) * 0.85) + ([NMeFOSAA] (ng/l) * 0.88) + [PFOS] (ng/l) + ([8:2 FTS] (ng/l) * 0.78)

 

This calculation is performed for each sampling event, and the resulting daily maximum and 30-day average results shall be reported on the discharge monitoring report submitted for the monthly monitoring period.

** The division does not currently have EPA ICIS codes for the following 4 parameters: 

Perfluoro-4-methoxybutanoic acid [PFMBA], ng/l

3-Perfluoropropyl propanoic acid [3:3 FTCA], ng/l

2H,2H,3H,3H-Perfluorooctanoic acid [5:3 FTCA], ng/l

3-Perfluoroheptyl propanoic acid [7:3 FTCA], ng/l

EPA has not yet provided the codes for these parameters. Therefore, data for these 4 parameters cannot currently be entered into ICIS.  However, the lack of ICIS codes is not intended to indicate relief from sampling or reporting for these parameters. The division anticipates issuing a correction with the ICIS codes prior to this permit becoming effective. However, in the event the ICIS codes are delayed, reporting of these pollutants remains a requirement as indicated in the permit table(s).  Data from the analysis for these 4 parameters should be submitted to the division on blank DMRs that will be sent to the permittee, for the division to enter manually. This will continue until a division-initiated permit modification with the codes becomes effective. As this facility is using netDMR, permit modifications like ICIS codes are immediate, and data can be entered upon the effective date of the modification.

Further, in order to provide a comprehensive list of PFAS quantification limits,the PFAS

Quantification Limits table previously included in Part I.E.5 of the permit has been deleted, and an updated PFAS Quantification Limits Table is included below.  

             

PFAS Quantification Limits Table – Per- and Poly-fluoroalkyl substances (PFAS) 

Parameter

Units1

PFAS QL

Parameter

Units1

PFAS QL

Perfluorooctanoic Acid [PFOA]

ng/L

1.6

2-[N-

methylperfluorooctanesulfonamido] acetic acid [NMeFOSAA]

ng/L

1.6

Perfluorobutanoic Acid [PFBA]

ng/L

6.4

Perfluorobutanesulfonic acid [PFBS]

ng/L

1.6

Perfluorooctanesulfonamide [PFOSA (or FOSA)]

ng/L

1.6

Perfluorodecanesulfonic acid [PFDS]

ng/L

1.6

Perfluoropentanoic acid [PFPeA]

ng/L

3.2

Perfluoroheptanesulfonic acid [PFHpS]

ng/L

1.6

Perfluorohexanoic acid [PFHxA]

ng/L

1.6

Perfluorohexanesulfonic acid [PFHxS]

ng/L

1.6

Perfluoroheptanoic acid [PFHpA]

ng/L

1.6

Perfluorooctanesulfonic acid [PFOS]

ng/L

1.6

Perfluorononanoic acid [PFNA]

ng/L

1.6

4:2 Fluorotelomer sulfonic acid [4:2

FTS]

ng/L

6.4

Perfluorodecanoic acid [PFDA]

ng/L

1.6

6:2 Fluorotelomer sulfonic acid [6:2

FTS]

ng/L

6.4

Perfluoroundecanoic acid [PFUnA (or PFUdA)]

ng/L

1.6

8:2 Fluorotelomer sulfonic acid [8:2

FTS]

ng/L

6.4

Perfluorododecanoic acid [PFDoA]

ng/L

1.6

Perfluoropentane sulfonic acid [PFPeS]

ng/L

1.6

Perfluorotridecanoic acid [PFTrDA (or RFTriA)]

ng/L

1.6

Perfluorononane sulfonic acid [PFNS]

ng/L

1.6

Perfluorotetradecanoic acid [PFTeDA (or PFTA or PFTeA)]

ng/L

1.6

Hexafluoropropylene oxide dimer acid [Gen-X (or HFPO-DA or HPFA-DA]

ng/L

6.4

2-[N-ethylperfluorooctanesulfonamido] acetic acid [NEtFOSAA]

ng/L

1.6

Perfluoro-3-methoxypropanoic acid [PFMPA]

ng/L

3.2

Perfluorododecanesulfonic acid [PFDoS]

ng/L

1.6

9-Chlorohexadecafluoro-3-oxanonane-

1-sulfonic acid [9CL-PF3ONS]

ng/L

6.4

N-methyl perfluorooctanesulfonamide [NMeFOSA]

ng/L

1.6

11-Chloroeicosafluoro-3-oxaundecane-

1-sulfonic acid [11CL-PF3OUDS]

ng/L

6.4

N-ethyl perfluorooctanesulfonamide [NEtFOSA]

ng/L

1.6

Perfluoro-4-methoxybutanoic acid [PFMBA]

ng/L

3.2

N-methyl perfluorooctanesulfonamidoethanol [NMeFOSE]

ng/L

16

Nonafluoro-3,6-dioxaheptanoic acid [NFDHA]

ng/L

3.2

N-ethyl perfluorooctanesulfonamidoethanol [NEtFOSE]

ng/L

16

3-Perfluoropropyl propanoic acid [3:3

FTCA]

ng/L

8

4,8-Dioxa-3H-perfluorononanoic acid [ADONA]

ng/L

6.4

2H,2H,3H,3H-Perfluorooctanoic acid

[5:3 FTCA]

ng/L

40

Perfluoro(2-ethoxyethane)sulfonic acid [PFEESA]

ng/L

3.2

3-Perfluoroheptyl propanoic acid [7:3

FTCA]

ng/L

40

1ng/L = nanograms per liter  

  

The following changes were also made to the permit:

The following PFAS Monitoring text (previously included in Part I.B.3 of the permit document):

“A one-time monitoring requirement for PFAS will be included in the certification to gather information on the presence of this substance in the effluent discharge.  The specific monitoring requirements are shown in Table 2f below. Please note that due to reporting system limitations, the frequency listed in the certification will be “annual”, however for each year the facility does not sample for PFAS parameters, the permittee should enter “Code 9 - Conditional Monitoring – Not Required this Period” into NetDMR for these parameters. Leaving these parameters blank in NetDMR will trigger a non-compliance violation.”

Has been updated in the new Part I.B.6 (PFAS Monitoring) of the permit document to the following text:

“A one-time monitoring requirement for PFAS will be included in the certification to gather information on the presence of this substance in the effluent discharge.  

Please note that due to reporting system limitations, the frequency listed in the certification will be “annual”, however for each year the facility does not sample for PFAS parameters, the permittee should enter “Code 9 - Conditional Monitoring – Not Required this Period” into NetDMR for these parameters. Leaving these parameters blank in NetDMR will trigger a non-compliance violation.”   

 

The PFAS Analysis section in Part I.E.5.f of the previous permit document was updated from the following :

 

“At the time of permit issuance, there is no EPA-approved analytical method for analyzing PFAS in wastewaters (non-potable) that are approved for Clean Water Act monitoring in accordance with 40 CFR Part 136 (Appendix B). The analytical method for the parameters in the table below shall be compliant with the requirements set forth in the Department of Defense (DoD) Quality Systems Manual (QSM) for Environmental Laboratories (DoD QSM 5.1 or later [Table B-15: Per- and Polyfluoroalkyl Substances (PFAS) Using Liquid Chromatography Tandem Mass] Spectrometry (LC/MS/MS) With Isotope Dilution or Internal Standard Quantification in Matrices Other Than Drinking Water]). 

 

At a minimum, the laboratory selected shall be able to analyze and quantify the PFAS listed in Table 2 at or below the associated PFAS quantification limits (PFAS QL). If the laboratory selected is capable of achieving a quantification limit for a specific PFAS that is lower than the PFAS QL listed below, analytical results should be reported to the department relative to the lower laboratory quantification limit, and not reported as “less than” the PFAS QL in the table below.

 

Any 40 CFR Part 136 (Appendix B) approved method for analyzing PFAS in wastewater that becomes available in the future would replace this current analytical method requirement.”

 

The updated text is as follows:

 

“At the time of permit issuance, there is no EPA-approved analytical method for analyzing PFAS in wastewaters (non-potable) that are approved for Clean Water Act monitoring in accordance with 40 CFR Part 136 (Appendix B). The analytical method for the PFAS parameters shall be compliant with the requirements set forth in the Department of Defense (DoD) Quality Systems Manual (QSM) for Environmental Laboratories, currently DoD QSM 5.4. DoD QSM 5.4 in turn requires compliance with EPA Draft Method 1633.

 

At a minimum, the laboratory selected shall be able to analyze and quantify the PFAS parameters at or below the associated PFAS quantification limits (PFAS QL). If the laboratory selected is capable of achieving a quantification limit for a specific PFAS that is lower than the PFAS QL listed below, analytical results should be reported to the department relative to the lower laboratory quantification limit, and not reported as “less than” the PFAS QL in the table below.

 

Any 40 CFR Part 136 (Appendix B) approved method for analyzing PFAS in wastewater that becomes available in the future would replace this current analytical method requirement.”

 Part III: Table V “Toxic Pollutants and Hazardous Substances Required To Be Identified by Existing Dischargers if Expected To Be Present” has been updated with the additional 15 PFAS parameters. 

These actions eliminate the need to modify the permit in the event there is a change to the method that results in different quantification limits.

 Image result for state of colorado seal

 _____________________________________________________________________________________________________________________________________________________________________________________________________________

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT

Water Quality Control Division

 

CDPS GENERAL PERMIT COG591000 DOMESTIC WASTEWATER TREATMENT PLANTS THAT DISCHARGE TO RECEIVING WATERS THAT ARE UNCLASSIFIED; USE PROTECTED; REVIEWABLE; OR ARE DESIGNATED THREATENED AND ENDANGERED SPECIES HABITAT

 

 

AUTHORIZATION TO DISCHARGE UNDER THE COLORADO DISCHARGE PERMIT SYSTEM (CDPS)

In compliance with the provisions of the Colorado Water Quality Control Act (25-8-101 et. seq. CRS, l973 as amended), and the Federal Water Pollution Control Act, as amended (33 U.S.C. 1251 et seq.; the “Act”), domestic wastewater treatment plants, with a design hydraulic capacity of less than one million gallons per day, are authorized to discharge from approved locations throughout the State of Colorado to waters of the state that are considered unclassified, use protected, reviewable, or are discharging to waters designated as threatened and endangered species habitat.  Such discharges shall be in accordance with effluent limitations, monitoring requirements and other conditions set forth in Parts I, II, and III hereof. All discharges authorized herein shall be consistent with the terms and conditions of this permit.

This permit specifically authorizes the entity identified in the certification of this permit to discharge from their domestic wastewater treatment plants, at the location described in the certification of this permit, to waters of the state as identified in the certification of this permit.

The authorization to discharge under this permit is in effect from the date of the certification of this permit until the expiration date identified below.

This permit and the authorization to discharge shall expire at midnight May 31st, 2027.

Issued and Signed , 2022.  

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT

PUBLIC NOTICE VERSION

AUGUST 11, 2022

Erin Scott, Acting Permits Section Manager

Water Quality Control Division

PERMIT ACTION SUMMARY:

Modification #3 – Minor Modification – Issued XX XX 2022, Effective XX XX, 2022 (Parts I.B.2-3)

Modification #2 – Minor Modification – Issued July 14 2022, Effective July 14, 2022 (Parts I.B.2-3)

Modification #1 – Minor Modification – Issued June 2, 2022, Effective June 2, 2022 (Parts I.B.3.c and I.B.3.d) Originally Issued April 30th, 2022; Effective June 1, 2022

 

TABLE OF CONTENTS

PART I........................................................................................................................................................................................................................ 3

A. COVERAGE UNDER THIS PERMIT............................................................................................................................................................. 3

1. Eligibility............................................................................................................................................................................................... 3

2. Application Requirements................................................................................................................................................................ 3

3. Certification Requirements............................................................................................................................................................. 4

B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS........................................................................................................... 4

1. Limitations, Monitoring Frequencies, and Sample Types for Effluent Parameters........................................................... 4

2. Discharges to Unclassified Waters................................................................................................................................................. 6

3. Discharges to Classified Waters.................................................................................................................................................... 10

4. New Facilities With Design Flows Of Less Than 1.0 MGD...................................................................................................... 31

5. EPA Periodic Pollutant Monitoring............................................................................................................................................... 35

6. PFAS Monitoring............................................................................................................................................................................... 35

7. Influent Parameters........................................................................................................................................................................ 35

C.   TERMS AND CONDITIONS..................................................................................................................................................................... 38

1. Service Area...................................................................................................................................................................................... 38

2. Design Capacity................................................................................................................................................................................ 38

3. Expansion Requirements................................................................................................................................................................ 38

4. Facilities Operation and Maintenance........................................................................................................................................ 39

5. Best Management Practices........................................................................................................................................................... 39

6. Change In Conditions...................................................................................................................................................................... 40

7. Lagoon Liner Integrity.................................................................................................................................................................... 40

8. Acute WET Testing........................................................................................................................................................................... 40

9. Chronic WET Testing....................................................................................................................................................................... 43

10. Compliance Schedule(s)............................................................................................................................................................... 47

11. Special Studies and Additional Monitoring.............................................................................................................................. 47

12. Industrial Waste Management..................................................................................................................................................... 47

D. DEFINITIONS OF TERMS.......................................................................................................................................................................... 49

E. PERMIT SPECIFIC MONITORING, SAMPLING AND REPORTING REQUIREMENTS........................................................................... 56

1. Routine Reporting of Data............................................................................................................................................................. 56

2. Annual Biosolids Report................................................................................................................................................................. 57

3. Representative Sampling............................................................................................................................................................... 57

4. Influent and Effluent Sampling Points........................................................................................................................................ 57

5. Analytical and Sampling Methods for Monitoring and Reporting......................................................................................... 58

6. Flow Measuring Devices................................................................................................................................................................. 60

A. DUTY TO COMPLY................................................................................................................................................................................... 61

B. DUTY TO REAPPLY.................................................................................................................................................................................. 62

C. NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE.................................................................................................................. 62

D. DUTY TO MITIGATE................................................................................................................................................................................. 62

E. PROPER OPERATION AND MAINTENANCE........................................................................................................................................... 62

F. PERMIT ACTIONS...................................................................................................................................................................................... 62

G. PROPERTY RIGHTS.................................................................................................................................................................................. 62

H. DUTY TO PROVIDE INFORMATION....................................................................................................................................................... 63

I.  INSPECTION AND ENTRY........................................................................................................................................................................ 63

J. MONITORING AND RECORDS.................................................................................................................................................................. 63

K. SIGNATORY REQUIREMENTS.................................................................................................................................................................. 64

L. REPORTING REQUIREMENTS.................................................................................................................................................................. 65

M. BYPASS...................................................................................................................................................................................................... 67

N. UPSET......................................................................................................................................................................................................... 67

O. REOPENER CLAUSE................................................................................................................................................................................. 68

P. OTHER INFORMATION............................................................................................................................................................................. 68

Q. SEVERABILITY.......................................................................................................................................................................................... 69

R. NOTIFICATION REQUIREMENTS............................................................................................................................................................ 69

S. RESPONSIBILITIES..................................................................................................................................................................................... 69

T. OIL AND HAZARDOUS SUBSTANCE LIABILITY.................................................................................................................................... 69

U. EMERGENCY POWERS............................................................................................................................................................................. 69

V. CONFIDENTIALITY................................................................................................................................................................................... 69

W. FEES........................................................................................................................................................................................................... 70

X. DURATION OF PERMIT............................................................................................................................................................................ 70

Y. SECTION 307 TOXICS.............................................................................................................................................................................. 70

PART III.................................................................................................................................................................................................................... 71

 

           

PART I

A. COVERAGE UNDER THIS PERMIT

1.         Eligibility

In order to be eligible for authorization to discharge under the terms and conditions of this permit, the owner of any domestic wastewater treatment plant that can meet the conditions identified at Part I.A.3., below, must submit a complete permit application form obtained from the Water Quality Control Division (Division).  Such application shall be submitted to the address listed on the application, at least 180 days prior to the anticipated date of first discharge.    

Authorization to discharge shall be site specific and not transferable to alternative locations.  Authorization to discharge will occur when the permittee receives a letter of certification for discharge under this permit, and is allowed to discharge on the effective date noted on the certification.  Authorization to discharge will expire on the expiration date of this general permit, which will also be noted on the certification.  A permittee desiring continued coverage under this general permit must reapply 180 days in advance of the expiration date.  

Upon receipt of a new or a renewal application, the Division will determine if the applicant continues to be eligible to continue to operate under the terms of the general permit.  If the Division determines that the operation does not fall under the authority of the general permit or is determined to be better suited for an individual permit, then the application received will be treated as an individual permit application, and the applicant will be notified about the decision to require an individual permit by a letter from the Division. For a renewal permit, any such applicant will continue to be covered under this general permit until such time as their application to discharge under another applicable general permit or individual permit is issued or denied by the Division.

2. Application Requirements 

The application referenced in Part I.A.1., above, will require the following information:

  1. The name, address, and location information of the municipality/company and its domestic wastewater treatment plant along with an accompanying USGS map, or a map of similar quality and sufficient detail to show the location of all unit processes on the property, and location of effluent discharge point and receiving water;
  2. The name, address, and phone number of the owner and of the certified operator in responsible charge;
  3. The name of water(s) receiving the discharge(s) and a listing of any downstream waters into which the receiving stream flows within five miles of the point of discharge;
  4. The latitude and longitude of the proposed discharge outfall or outfalls;
  5. A United States Geological Survey (USGS) map, or a map of similar quality, which shows the service area for the domestic wastewater treatment plant;  
  6. A list of non-residential users (commercial users, including hauled septage from Individual

Sewage Disposal Systems (ISDSs), and industrial users) whose waste is treated by the facility;

  1. A description of the method(s) and chemicals used for treatment and/or disposal of grit, screenings, and sludge (biosolids);
  2. A summary of recent flow, loading, and influent and effluent quality data along with a description of the operation and management procedures to be used at the domestic wastewater treatment plant;

 

  1. A description of the analytical methods and equipment to be used to measure flows and to analyze pollutants of concern in the discharge; and,

3. Certification Requirements

The applicant must certify, or the Division must find, that the following conditions exist at the domestic wastewater treatment plant or the domestic wastewater treatment plant will not be certified to discharge under the authority of the general permit:

  1. The treatment plant is a domestic wastewater treatment plant as defined in Regulation No. 22 (5

CCR 1002-22): Site Location And Design Approval Regulations for Domestic Wastewater Treatment Works;

  1. The domestic wastewater treatment plant is not required to develop an industrial pretreatment program pursuant to either Section 307 of the federal Clean Water Act or Section 63.9 of  Regulation No. 63 (5 CCR 1002-63): Pretreatment Regulations;
  2. The domestic wastewater treatment plant does not accept any hazardous waste as defined at Part 261 of the Solid and Hazardous Waste Commission’s Regulations (6 CCR 1007-3) for treatment and discharge by truck, rail, or dedicated pipeline; 
  3. Design Capacity:  The rated design capacity of the wastewater treatment works must be less than 1.0 Millon Gallons per Day (MGD); 
  4. The facility is a domestic wastewater treatment facility discharging to at least one of the following: 1) an unclassified water; 2) a use protected water; 3) a reviewable water; or 3) a water that has been designated as threatened and endangered species habitat (including an area within the associated 100-year flood plain).
  5. The discharge to an unclassified water must not return flow to a classified water that has an Outstanding Water designation.

B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS

1. Limitations, Monitoring Frequencies, and Sample Types for Effluent Parameters

In order to obtain an indication of the probable compliance or non-compliance with the effluent limitations specified in Part I.B, the permittee shall monitor all effluent parameters at the frequencies and sample types, as identified in the certification of this permit.  Such monitoring will begin immediately and last for the life of the permit unless otherwise noted.  The results of such monitoring shall be reported on the Discharge Monitoring Report form (See Part I.E).

Self-monitoring sampling by the permittee for compliance with the effluent monitoring requirements specified in this permit, shall be performed at the location(s) designated in the certification authorizing discharge under this permit, following final treatment but prior to entering the receiving stream or potentially mixing with or influenced by other waters, unless otherwise specified in the certification.  Any discharge to the waters of the State from a point source other than specifically authorized by this permit is prohibited.

If the permittee, using an approved analytical method, monitors any parameter more frequently than required by this permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form (DMRs) or other forms as required by the Division.  Such increased frequency shall also be indicated.

  1. Flow Recording Device - Treatment facilities are typically required to have both influent and effluent flow measuring and recording devices. Where influent flow metering is not practicable, the Division may approve on a case-by-case basis flow metering at the effluent end of the treatment facility or flow metering by some other means. For these facilities, influent and/or effluent flow measuring and sampling type will be specified in the certification.  If only one

device is applicable, then that device will be used to report both influent and effluent flow. Reported flows will be used to monitor compliance with the effluent flow limitation and hydraulic loading to the plant.    

  1. Percentage Removal Requirements (BOD5 and TSS Limitations) - If noted in the limits table(s), the arithmetic mean of the BOD5 and TSS concentrations for effluent samples collected during the DMR reporting period shall demonstrate a minimum of eighty-five percent (85%) removal of both BOD5 (or CBOD5), and TSS, as measured by dividing the respective difference between the mean influent and effluent concentrations for the DMR monitoring period by the respective mean influent concentration for the DMR monitoring period, and multiplying the quotient by 100.  Percent removal for TSS for lagoon facilities is waived in accordance with Regulation 62.5(3). Dischargers to the surface water through hydrologically connected groundwater that are neither mechanical nor lagoon facilities will be evaluated on a case-by-basis for technology-based effluent limitations.
  1. Oil and Grease Monitoring:  For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall be collected and analyzed for oil and grease, and reported on the appropriate DMR under parameter 03582.  In addition, corrective action shall be taken immediately to mitigate the discharge of oil and grease.  A description of the corrective action taken should be included with the DMR.
  1. Total Residual Chlorine:  Monitoring for TRC is required only when chlorine is in use.
  1. Metals: Metals concentrations measured in compliance with the effluent monitoring requirements listed in Part I.A of this permit may be used to satisfy any industrial waste management metals monitoring requirements listed in Part I.C.12, if the metals are in the same form (i.e. total).  Sampling must be conducted in accordance with Part I.C.12.  
  1. Additional or Alternate Limitations:  The certification may include limitations or monitoring requirements for any pollutant(s) based on site specific considerations including but not limited to: inclusion on the 303(d) or Monitoring and Evaluation List in Regulation No. 93; an approved TMDL with a waste load allocation; an approved Discharger Specific Variance (DSV); compliance with any Division compliance order on consent, cease and desist order, or an EPA administrative order, or similar decree promulgated by the Division, EPA or any other public entity.  The limitations and monitoring requirements will vary depending on the parameter, and will be fully enforceable under this permit.
  1. Salinity Parameters:  Regulation 61.8(2)(l) contains requirements regarding salinity for any discharges to the Colorado River Watershed.  For discharges tributary to the Colorado River Basin, the permittee shall monitor the raw water source and the wastewater effluent at the frequencies identified in the appropriate table below.  The results are to be reported on the Discharge Monitoring Report. 

Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken prior to treatment of the raw drinking water source (with a composite sample proportioned to flow prepared from individual grab samples if more than one source is being utilized), and at the established domestic wastewater treatment plant effluent sampling point identified in the certification and in Part I.B of this permit.

In accordance with the Water Quality Control Commission Regulations for Effluent Limitations and the Colorado Discharge Permit System Regulations, Section 61.8(2), the permitted discharge shall not contain effluent parameter concentrations, which exceed the limitations for the facility types listed below in Parts I.B.2, I.B.3, I.B.4 or I.B.5.

2. Discharges to Unclassified Waters

The following effluent limitations, listed in Part I.B.2, Tables 1a-1d will apply to discharges to unclassified waters where there is no return flow to a classified water of the state. Footnotes for Tables 1a – 1d are defined following Table 1d.

In accordance with the Water Quality Control Commission Regulations for Effluent Limitations, Section 62.4, and the Colorado Discharge Permit System Regulations, Section 61.8(2), the permitted discharge shall not contain effluent parameter concentrations, which exceed the following limitations:

Table 1a

Mechanical Facilities with Design Flows Less Than or Equal to 0.25 MGD Discharging to Unclassified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

Frequency

1

Type2

50050

Flow, MGD3

TBD

 

Report

Continuous

4

Recorder4

00310

BOD5, mg/l5

30 

45

 

Monthly

Composite

81010

BOD5, percent removal5, 6

85% (min)

   

Monthly

Calculated

00530

Total Suspended Solids, mg/l 

30

45

 

Monthly

Composite

81011

TSS, percent removal6

85% (min)

   

Monthly

Calculated

50060

Total Residual Chlorine, mg/l

   

0.5

Weekly

Grab

00400

pH, s.u.

   

6.0-9.0

Weekly

Grab

84066

Oil and Grease, mg/l 

   

Report

Weekly

Visual

03582

Oil and Grease, mg/l 

   

10

Contingent

Grab

51040

E. coli, #/100 ml7

2,000   

4,000

 

Monthly

Grab

00610

Total Ammonia, mg/l as N

Report

 

Report

Monthly

Composite

00665

Total Phosphorous, mg/l 8

TBD

 

TBD

Monthly

Composite

00665

Total Phosphorous, lbs/month 8

Report 

 

Report 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months 9

TBD 

 

NA

Monthly

Calculated

70295

Total Dissolved Solids,  mg/l9

Report

 

Report

Quarterly

Composite

 

Other Pollutants, units 

TBD 

 

TBD

TBD

TBD

 

Regulation 85 or Regulation 31 Nutrients 10

Running

Annual

Median

95% percentile

 

Frequency

Type

00665

Total Phosphorus, mg/l

See Table 7a or 7d/7e

See Table 7a

 

Monthly

Composite

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

 

Monthly

Composite

TBD means to be determined for each certification.

Table 1b

Mechanical Facilities with Design Flows Greater Than 0.25 MGD and less  than 1.0 MGD Discharging to Unclassified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

Frequency1

Type2

50050

Flow, MGD3

TBD

 

Report

Continuous4

Recorder4

00310

BOD5, mg/l5

30 

45

 

Weekly

Composite

81010

BOD5, percent removal5, 6

85% (min)

   

Weekly

Calculated

00530

Total Suspended Solids, mg/l 

30

45

 

Weekly

Composite

81011

TSS, percent removal6

85% (min)

   

Weekly

Calculated

50060

Total Residual Chlorine, mg/l

   

0.5

3 days/week

Grab

00400

pH, s.u.

   

6.0-9.0

Daily

Grab

84066

Oil and Grease, mg/l 

   

Report

Daily

Visual

03582

Oil and Grease, mg/l 

   

10

Contingent

Grab

51040

E. coli, #/100 ml 7

2,000   

4,000

 

Weekly

Grab

00610

Total Ammonia, mg/l as

N8

Report

 

Report

Weekly

Composite

00665

Total Phosphorous, mg/l 8

TBD

 

TBD

Monthly

Composite

00665

Total Phosphorous, lbs/month 8

Report 

 

Report 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months 8

TBD 

 

NA

Monthly

Calculated

70295

Total Dissolved Solids,  mg/l 9

Report

 

Report

Quarterly

Composite

 

Other Pollutants, units 

TBD 

 

TBD

TBD

TBD

 

Regulation 85 or Regulation 31 Nutrients 10

Running

Annual

Median

95% percentile

 

Frequency

Type

00665

Total Phosphorus, mg/l

See Table 7a or 7d/7e

See Table 7a

 

Monthly

Composite

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

 

Monthly

Composite

TBD means to be determined for each certification.

 

  

Table 1c

Lagoon  or Other Non- Mechanical Facilities With Design Flows Less or Equal to 0.5 MGD

Discharging to Unclassified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

Frequency1

Type2

50050

Flow, MGD3

TBD

 

Report

Continuous4

Recorder4

00310

BOD5, mg/l5

30  

45

 

Monthly

Grab

81010

BOD5, percent removal5, 6

85% (min)

 

 

Monthly

Calculated

00530

Total Suspended Solids, mg/l  

 

 

 

 

 

 

Aerated Lagoons

75

 

110

Monthly

Grab

 

Non-Aerated Lagoons

105

 

160

Monthly

Grab

81011

TSS, percent removal6

85% (min)

 

 

Monthly

Calculated

50060

Total Residual Chlorine, mg/l

 

 

0.5

Weekly

Grab

00400

pH, s.u.

 

 

6.0-9.0

Weekly

Grab

84066

Oil and Grease, mg/l  

 

 

Report

Weekly

Visual

03582

Oil and Grease, mg/l  

 

 

10

Contingent

Grab

51040

E. coli, #/100 ml7

2,000   

4,000

 

Monthly

Grab

00610

Total Ammonia, mg/l as N

Report

 

Report

Monthly

Grab

00665

Total Phosphorous, mg/l8

TBD

 

TBD

Monthly

Grab

00665

Total Phosphorous, lbs/month8

Report  

 

Report  

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months8

TBD  

 

NA

Monthly

Calculated

70295

Total Dissolved Solids,  mg/l9

Report

 

Report

Quarterly

Grab

 

Other Pollutants, units  

TBD  

 

TBD

TBD

TBD

 

Regulation 85 or Regulation 31 Nutrients 10

Running

Annual

Median

95% percentile

 

Frequency

Type

00665

Total Phosphorus, mg/l

See Table

7a or

7d/7e

See Table 7a

 

Monthly

Grab

00640

Total Inorganic Nitrogen, mg/l  

See Table 7a

See Table 7a

 

Monthly

Grab

TBD means to be determined for each certification.

Table 1d

Lagoon  or Other Non- Mechanical Facilities With Design Flows Greater than 0.5 MGD Discharging to Unclassified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

Frequency1

Type2

50050

Flow, MGD3

TBD

 

Report

Continuous4

Recorder4

00310

BOD5, mg/l5

30  

45

 

Weekly

Grab

81010

BOD5, percent removal5, 6

85% (min)

 

 

Weekly

Calculated

00530

Total Suspended Solids, mg/l  

 

 

 

 

 

 

Aerated Lagoons

75

 

110

Weekly

Grab

 

Non-Aerated Lagoons

105

 

160

Weekly

Grab

81011

TSS, percent removal6

85% (min)

 

 

Weekly

Calculated

50060

Total Residual Chlorine, mg/l

 

 

0.5

5 days/week

Grab

00400

pH, s.u.

 

 

6.0-9.0

5 day/week

Grab

84066

Oil and Grease, mg/l  

 

 

Report

5 days/week

Visual

03582

Oil and Grease, mg/l  

 

 

10

Contingent

Grab

51040

E. coli, #/100 ml7

2,000   

4,000

 

Weekly

Grab

00610

Total Ammonia, mg/l as N

Report

 

Report

Weekly

Grab

00665

Total Phosphorous, mg/l8

TBD

 

TBD

Monthly

Grab

00665

Total Phosphorous, lbs/month8

Report  

 

Report  

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months8

TBD  

 

NA

Monthly

Calculated

70295

Total Dissolved Solids,  mg/l9

Report

 

Report

Quarterly

Grab

 

Other Pollutants, units  

TBD  

 

TBD

TBD

TBD

 

Regulation 85 or Regulation 31 Nutrients 10

Running

Annual

Median

95% percentile

 

Frequency

Type

00665

Total Phosphorus, mg/l

See Table

7a or

7d/7e

See Table 7a

 

Monthly

Grab

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

 

Monthly

Grab

FOOTNOTES FOR TABLES 1a-1d

  • 1 Monitoring frequency reductions may be granted, in accordance with the Baseline Monitoring Frequency, Sample Type, and Reduced Monitoring Frequency Policy for Industrial and Domestic Wastewater Treatment Facilities (WQP-20).
  • 2 See the definition of “composite” in Part I.D of this permit. If the division determines that a flow-weighted composite sample is impracticable for a facility, a time composite sample of four equal aliquots collected at two-hour intervals will be allowed. The monitoring frequency and sample type will be specified in the certification. See Section VI.A of the fact sheet for more information.
  • 3 The 30-day average effluent limitation for flow is identified in the certification, is generally based on the design capacity of the facility as outlined in the most recent site approval, and is enforceable under this permit. Facilities with flow equalization basin and reclaimed water configurations may be addressed differently. See 61.8(2)(f).
  • 4 The monitoring frequency and sample type for effluent flow is specified in the certification and is fully enforceable under this permit.  Mechanical type treatment facilities are typically required to have both influent and effluent flow measuring and recording devices. This requirement may be waived in cases where the division determines that either influent or effluent flow measurements are impractical. For these facilities, flow measuring and sampling type will be specified in the certification. If only one device is applicable, then that device will be used to report both influent and effluent flow.  However, where these devices are not in place at the time of certification, the permittee has one year from the end of the calendar month that certification was given to install the required equipment.  Where such equipment is in place, the

 

frequency and type of flow monitoring will be "Continuous" and "Recorder", respectively.  Where such equipment is not in place, the frequency and type of flow monitoring, during the interim period, will be specified in the certification.  For certain facilities, the use of a metered pumping rate or potable water use or may be allowed.  In these cases, the monitoring frequency and sample type are determined and specified in the certification.

  • 5 Limitations for 5-day Carbonaceous Biochemical Oxygen Demand (CBOD5) of 25 mg/l (30-day average) and 40 mg/l (maximum 7-day average) may be substituted for the limits for BOD5 as identified in the certification. 85% removal of CBOD5 would also be required. 
  • 6 For domestic sources, where the permittee has demonstrated that the treatment facility is unable to meet the 85 percent removal requirement for a parameter and the inability to meet the requirement is not caused by infiltration and inflow, a lower percent removal requirement or a mass loading limit may be substituted provided that the permittee can demonstrate that the numeric limitations for BOD5, CBOD5, and TSS can be met.
  • 7 For coli the statistic used is the Geometric Mean, which is based on Method 1: Geometric Mean  = (a*b*c*d*...)(1/n) , or Method 2: Geometric Mean  = antilog([log(a)+log(b)+log(c)+log(d)+...]/n).
  • 8 Total Phosphorous limits will be established and included in the certification, where applicable, and may be based on Regulation 85 phosphorus  limits, Regulation 31 phosphorus limits, basin regulations (Reg 32-38) phosphorus limits, or Regulations 71-74. The limits and reporting requirements, where applicable, will be fully enforceable under this permit.
  • 9 TDS monitoring requirement applies to discharges in the Colorado River basin. Samples are to be of the raw water supply.  If more than one source is being utilized, a composite sample proportioned to flow shall be prepared from individual grab samples.
  • 10 New facilities will also be subject to total inorganic nitrogen and total phosphorus requirements in Part I.B.4 of the permit.

  

3. Discharges to Classified Waters

For discharges to unclassified water where return flow to a classified state water is possible or for discharges into classified water, the limitations under Part I.B. Tables 2a-2d will apply.  For discharges where the receiving stream is a T&E water, the zero dilution limitations shown under Tables 3a through 7e will apply. Footnotes for Tables 2a-2d are defined following Table 2d.

In accordance with the Water Quality Control Commission Regulations for Effluent Limitations, Section 62.4, and the Colorado Discharge Permit System Regulations, Section 61.8(2), the permitted discharge shall not contain effluent parameter concentrations, which exceed the following limitations:

Table 2a

Mechanical Facilities with Design Flows Less Than or Equal to 0.25 MGD Discharging to Classified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

2-year Avg.

Frequency

1

Type2

50050

Flow, MGD

TBD 1

 

Report

 

Continuous

4

Recorder 4

00310

BOD5, mg/l 5

30 

45 2

   

Monthly

Composite

81010

BOD5, percent removal5,6

85% (min)

     

Monthly

Calculated

00530

Total Suspended Solids, mg/l

30

45

   

Monthly

Composite

81011

TSS, percent removal 6

85% (min)

     

Monthly

Calculated

00400

pH, s.u.

   

6.5-9.0

 

Weekly

Grab

84066

Oil and Grease, mg/l

   

Report

 

Weekly

Visual

03582

Oil and Grease, mg/l

   

10

 

Contingent

Grab

51040

E. coli, no/100 ml7

See Tables 3a-3c

2 X 30-day Avg.

 

See Tables  3d – 3f

Monthly

Grab

50060

Total Residual Chlorine, mg/l

See Table 4a

 

See Table 4b

See Table 4c

Weekly

Grab

00640

Total Inorganic Nitrogen

   

See Table 5a 

See Table 5b

Monthly

Composite

00610

Total Ammonia, mg/l as N

See Table 6a or 6c

 

See Table 6e or 6g

See Table 6i or 6k

Monthly

Composite

00665

Total Phosphorous, mg/l

8

TBD 

 

TBD 

 

Monthly

Composite

00665

Total Phosphorous, lbs/month8

Report 

 

Report 

 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months 8

TBD 

 

NA

 

Monthly

Calculated

70295

Total Dissolved Solids, mg/l 9

Report 

 

Report 

 

Quarterly

Composite

00010

Temp Daily Max (°C)

   

TBD

 

Continuous

Recorder

00010

Temp Daily Max (°C)

   

TBD

 

Continuous

Recorder

00010

Temp MWAT (°C)

 

TBD

   

Continuous

Recorder

00010

Temp MWAT (°C)

 

TBD

   

Continuous

Recorder

 

Other Pollutants, units

TBD

 

TBD

TBD

TBD

TBD

 

WET, Acute 10

           

TAN6

C

LC50 Statre 96Hr Acute Pimephales promelas

   

LC50 ≥ 100

 

TBD

Grab

TAM3

B

LC50 Statre 48Hr Acute Ceriodaphnia dubia

   

LC50 ≥ 100

 

TBD

Grab

 

WET, Chronic 10

           

TKP6

C

Static Renewal 7 Day Chronic  Pimephales promelas

   

NOEC or

IC25 ≥ IWC 

 

TBD

3

Composites

/Test

TKP3

B

Static Renewal 7 Day

Chronic Ceriodaphnia

Dubia

   

NOEC or

IC25 ≥ IWC

 

TBD

3

Composites

/Test

 

Regulation 85 or

Regulation 31 Nutrients

11

Running

Annual

Median

95% percentile

 

 

Frequency

Type

00665

Total Phosphorus, mg/l

See Table 7a or 7d/7e

See Table 7a

   

Monthly

Composite

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

   

Monthly

Composite

00600

Total Nitrogen, mg/l  12

See Table 7b/7c

     

Monthly

Composite

TBD means to be determined for each certification.

Table 2b

Mechanical Facilities with Design Flows Greater Than 0.25 MGD and Less Than 1.0 MGD Discharging to Classified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

2-year Avg.

Frequency1

Type2

50050

Flow, MGD3

TBD 

 

Report

 

Continuous 4

Recorder 4

00310

BOD5, mg/l5

30 

45 

   

Weekly

Composite

81010

BOD5, percent removal5,6

85% (min)

     

Weekly

Calculated

00530

Total Suspended Solids, mg/l 

30

45

   

Weekly

Composite

81011

TSS, percent removal 6

85% (min)

     

Weekly

Calculated

00400

pH, s.u.

   

6.5-9.0

 

Daily

Grab

84066

Oil and Grease, mg/l 

   

Report

 

Daily

Visual

03582

Oil and Grease, mg/l 

   

10

 

Contingent

Grab

51040

E. coli, no/100 ml 7

See Tables 3a – 3c

2 X 30day Avg.

 

See

Tables 3d – 3f

Weekly

Grab

50060

Total Residual Chlorine, mg/l

See Table 4a

 

See Table 4b

See Table 4c

3 days/week

Grab

00640

Total Inorganic Nitrogen

   

See Table 5a

See Table 5b

Weekly

Composite

00610

Total Ammonia, mg/l as N

See Table 6a or 6c

 

See Table 6e or 6g

See Table 6i or 6k

Weekly

Composite

00665

Total Phosphorous, mg/l 8

TBD 

 

TBD 

 

Monthly

Composite

00665

Total Phosphorous, lbs/month 8

Report 

 

Report  

 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months 8

TBD 

 

NA

 

Monthly

Calculated

70295

Total Dissolved Solids, mg/l 9

 Report

 

Report

 

Quarterly

Composite

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

 

Other Pollutants, units 

TBD 

 

TBD

TBD

TBD

TBD

 

WET, Acute 10

           

TAN6C

LC50 Statre 96Hr Acute Pimephales promelas

   

LC50 ≥ 100

 

TBD

Grab

TAM3B

LC50 Statre 48Hr Acute Ceriodaphnia dubia

   

LC50 ≥ 100

 

TBD

Grab

 

WET, Chronic 10

           

TKP6C

Static Renewal 7 Day Chronic  Pimephales promelas 

   

NOEC or

IC25 ≥ IWC 

 

TBD

3

Composites

/Test

TKP3B

Static Renewal 7 Day Chronic Ceriodaphnia Dubia

   

NOEC or

IC25 ≥ IWC

 

TBD

3

Composites

/Test

 

Regulation 85 or Regulation 31 Nutrients11

Running

Annual

Median

95% percentil e

   

Frequency

Type

00665

Total Phosphorus, mg/l

See Table

7a or

7d/7e

See Table 7a

   

Monthly

Composite

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

   

Monthly

Composite

00600

Total Nitrogen, mg/l 12

See Table 7b/7c

     

Monthly

Composite

Table 2c

Non-Mechanical Facilities with Design Flows Less Than or Equal to 0.5 MGD Discharging to Classified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

2-year Avg.

Frequency1

Type2

50050

Flow, MGD3

TBD 

 

Report

 

Continuous 4

Recorder 4

00310

BOD5, mg/l 5

30 

45 

   

Monthly

Grab

81010

BOD5, percent removal 5,6

85% (min)

     

Monthly

Calculated

00530

Total Suspended Solids, mg/l 6  

           
 

  Aerated Lagoons

75

110

   

Monthly

Grab

 

  Non-aerated Lagoons

105

160

   

Monthly

Grab

81011

TSS, percent removal 6

NA

         

00400

pH, s.u.

   

6.5-9.0

 

Weekly

Grab

84066

Oil and Grease, mg/l 

   

Report

 

Weekly

Visual

03582

Oil and Grease, mg/l 

   

10

 

Contingent

Grab

51040

E. coli, no/100 ml 7

See

Tables 3a

– 3c

2 X 30day Avg.

 

See Tables 3d – 3f

Monthly

Grab

50060

Total Residual Chlorine, mg/l

See Table 4a

 

See Table 4b

See Table 4c

Weekly

Grab

00640

Total Inorganic Nitrogen

   

See Table 5a

See Table 5b

Monthly

Grab

00610

Total Ammonia, mg/l as N

See Table 6b or 6d

 

See Table 6f or 6h

See Table 6j or 6l

Monthly

Grab

00665

Total Phosphorous, mg/l8

TBD 

 

TBD 

 

Monthly

Grab

00665

Total Phosphorous, lbs/month8

Report 

 

Report   

 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive

months8

TBD 

 

NA

 

Monthly

Calculated

70295

Total Dissolved Solids, mg/l 9

 Report 

 

Report 

 

Quarterly

Grab

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

 

Other Pollutants, units 

TBD 

 

TBD

TBD

TBD

TBD

 

WET, Acute 10

           

TAN6C

LC50 Statre 96Hr Acute Pimephales promelas

   

LC50 ≥ 100

 

TBD

Grab

TAM3B

LC50 Statre 48Hr Acute Ceriodaphnia dubia

   

LC50 ≥ 100

 

TBD

Grab

 

WET, Chronic 10

           

TKP6C

Static Renewal 7 Day Chronic  Pimephales promelas 

   

NOEC or

IC25 ≥ IWC 

 

TBD

3

Composites

/Test

TKP3B

Static Renewal 7 Day Chronic Ceriodaphnia Dubia

   

NOEC or

IC25 ≥ IWC

 

TBD

3

Composites

/Test

 

Regulation 85 or Regulation 31 Nutrients11

Running

Annual

Median

95% percentil e

   

Frequency

Type

00665

Total Phosphorus, mg/l

See Table

7a or

7d/7e

See Table 7a

   

Monthly

Grab

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

   

Monthly

Grab

00600

Total Nitrogen, mg/l 12

See Table 7b/7c

     

Monthly

Grab

Table 2d

Non-Mechanical Facilities  with Design Flows Greater Than 0.5 MGD and Less Than 1.0 MGD Discharging to Classified Waters

ICIS

Code

Parameter

Limitation

Sampling

30-day Avg.

7-day Avg.

Daily Max

2-year Avg.

Frequency1

Type2

50050

Flow, MGD

TBD 3

 

Report

 

Continuous 4

Recorder 4

00310

BOD5, mg/l 5

30 

45 

   

Weekly

Grab

81010

BOD5, percent removal5,6

85% (min)

     

Weekly

Calculated

00530

Total Suspended Solids, mg/l 

           
 

  Aerated Lagoons

75

110

   

Weekly

Grab

 

  Non-aerated Lagoons

105

160

   

Weekly

Grab

81011

TSS, percent removal 6

NA

         

00400

pH, s.u.

   

6.5-9.0

 

5 days/week

Grab

84066

Oil and Grease, mg/l 

   

Report

 

5 days/week

Visual

03582

Oil and Grease, mg/l 

   

10

 

Contingent

Grab

51040

E. coli, no/100 ml7

See Tables 3a – 3c

2 X 30-day Avg.

 

See

Tables

3d – 3f

Weekly

Grab

50060

Total Residual Chlorine, mg/l

See Table 4b

 

See Table 4a

See

Table

4c

5 days/week

Grab

00640

Total Inorganic Nitrogen

   

See Table 5a

See

Table

5b

Weekly

Grab

00610

Total Ammonia, mg/l as N

See Table 6b or 6d

 

See Table 6f or 6h

See

Table 6j or 6l

Weekly

Grab

00665

Total Phosphorous, mg/l 8

TBD 

 

TBD 

 

Monthly

Grab

00665

Total Phosphorous, lbs/month 8

Report 

 

Report 6

 

Monthly

Calculated

00665

Total Phosphorous, cumulative lbs/previous 12 consecutive months 8

TBD 

 

NA

 

Monthly

Calculated

70295

Total Dissolved Solids, mg/l 9

 Report 

 

Report 

 

Quarterly

Grab

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp Daily Max (°C) 

   

TBD

 

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

00010

Temp MWAT (°C) 

 

TBD

   

Continuous

Recorder

 

Other Pollutants, units 

TBD 

 

TBD

TBD

TBD

TBD

 

WET, Acute10

           

TAN6C

LC50 Statre 96Hr Acute Pimephales promelas

   

LC50 ≥ 100

 

TBD

Grab

TAM3B

LC50 Statre 48Hr Acute Ceriodaphnia dubia

   

LC50 ≥ 100

 

TBD

Grab

 

WET, Chronic10

           

TKP6C

Static Renewal 7 Day Chronic  Pimephales promelas 

   

NOEC or

IC25 ≥ IWC 

 

TBD

3

Composites

/Test

TKP3B

Static Renewal 7 Day Chronic Ceriodaphnia Dubia

   

NOEC or

IC25 ≥ IWC

 

TBD

3

Composites

/Test

 

Regulation 85 or Regulation 31 Nutrients11

Running

Annual

Median

95% percentile

   

Frequency

Type

00665

Total Phosphorus, mg/l

See Table

7a or

7d/7e

See Table 7a

   

Monthly

Grab

00640

Total Inorganic Nitrogen, mg/l

See Table 7a

See Table 7a

   

Monthly

Grab

00600

Total Nitrogen, mg/l 12

See Table 7b/7c

     

Monthly

Grab

Footnotes for Table 2a-2d

  • 1 Monitoring frequency reductions may be granted, in accordance with the Baseline Monitoring Frequency, Sample Type, and Reduced Monitoring Frequency Policy for Industrial and Domestic Wastewater Treatment Facilities (WQP-20).
  • 2 See the definition of “composite” in Part I.D of this permit. If the division determines that a flow-weighted composite sample is impracticable for a facility, a time composite sample of four equal aliquots collected at two-hour intervals will be allowed. The monitoring frequency and sample type will be specified in the certification. See Section VI.A of the fact sheet for more information.
  • 3 The 30-day average effluent limitation for flow is identified in the certification, is generally based on the design capacity of the facility as outlined in the most recent site approval, and is enforceable under this permit. Facilities with flow equalization basin and reclaimed water configurations may be addressed differently. See 61.8(2)(f).
  • 4 The monitoring frequency and sample type for effluent flow is specified in the certification and is fully enforceable under this permit.  Mechanical type treatment facilities are typically required to have both influent and effluent flow measuring and recording devices. This requirement may be waived in cases where the division determines that either influent or effluent flow measurements are impractical. For these facilities, flow measuring and sampling type will be specified in the certification. If only one device is applicable, then that device will be used to report both influent and effluent flow.  However, where these devices are not in place at the time of certification, the permittee has one year from the end of the calendar month that certification was given to install the required equipment.  Where such equipment is in place, the frequency and type of flow monitoring will be "Continuous" and "Recorder", respectively.  Where such equipment is not in place, the frequency and type of flow monitoring, during the interim period, will be specified in the certification.  For certain facilities, the use of a metered pumping rate or potable water use or may be allowed.  In these cases, the monitoring frequency and sample type are determined and specified in the certification.
  • 5 Limitations for 5-day Carbonaceous Biochemical Oxygen Demand (CBOD5) of 25 mg/l (30-day average) and 40 mg/l (maximum 7day average) may be substituted for the limits for BOD5 as identified in the certification. 85% removal of CBOD5 would also be required. 
  • 6 For domestic sources, where the permittee has demonstrated that the treatment facility is unable to meet the 85 percent removal requirement for a parameter and the inability to meet the requirement is not caused by infiltration and inflow, a lower percent removal requirement or a mass loading limit may be substituted provided that the permittee can demonstrate that the numeric limitations for BOD5, CBOD5, and TSS can be met.
  • 7 For coli the statistic used is the Geometric Mean, which is based on Method 1: Geometric Mean  = (a*b*c*d*...)(1/n) , or Method 2: Geometric Mean  = antilog([log(a)+log(b)+log(c)+log(d)+...]/n).
  • 8 Total Phosphorus limits are established and included in the certification, where applicable, and are based on the applicable regulation (Regulation Nos. 71-74). 
  • 9 TDS monitoring requirement applies to discharges in the Colorado River basin. Samples are to be of the raw water supply.  If more than one source is being utilized, a composite sample proportioned to flow shall be prepared from individual grab samples.
  • 10 Monitoring frequency for WET testing are implemented in accordance with the Division’s Whole Effluent Toxicity (WET) Testing Policy. For chronic WET, “Composite” = 24 hour Composite. The in-stream waste concentration (IWC) for each facility is specified in the certification and determined using the following equation: IWC = [Facility Flow (FF)/(Stream Chronic Low Flow

(annual) + FF)] X 100%

  • 11 New facilities will also be subject to total inorganic nitrogen and total phosphorus requirements in Part I.B.4 of the permit.
  • 12 This facility is eligible for Regulation 31 Total Nitrogen due to available dilution instead of Regulation 85 Total Inorganic Nitrogen. 

  

a. Effluent limitations for E. Coli

The following chronic 30-day Geometric Mean E. coli water quality based effluent limitations (WQBEL) will apply based on the appropriate dilution and upstream water quality.  The shaded cells in the E. coli WQBEL tables 3a-3c indicate that the result is greater than the allowed maximum, and therefore the limit will be set to 2,000 CFU/100mL. 

If the exact dilution ratio of a facility to stream flow is not shown on Tables 3a-3c below, the next lower dilution ratio will be used in the selection of the limit, in order to be protective of the receiving stream at the point of discharge. Note that for dilution ratios over 20:1 (for E, U, and P classified waters) or 5:1 (for N classified waters), the selected WQBEL limit will be above the maximum allowable E. coli limit of 2,000 CFU/100ml, therefore additional dilution is inconsequential. 

If the exact ambient concentration is not shown on Tables 3a-3c below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge.  

The acute 7-day Geometric mean WQBEL will be based on a limit that is two times the chronic 30day limit.

 

Table 3a

 
 

E. coli Chronic WQBEL for Recreation E and U Classified Waters 

 
   

30E3 : Design Flow Dilution Ratio

 
   

0

1

2

3

4

5

7

10

13

15

20

 

1

126

251

376

501

626

751

1001

1376

1751

2001

2626

2

126

250

374

498

622

746

994

1366

1738

1986

2606

3

126

249

372

495

618

741

987

1356

1725

1971

2586

4

126

248

370

492

614

736

980

1346

1712

1956

2566

5

126

247

368

489

610

731

973

1336

1699

1941

2546

10

126

242

358

474

590

706

938

1286

1634

1866

2446

25

126

227

328

429

530

631

833

1136

1439

1641

2146

50

126

202

278

354

430

506

658

886

1114

1266

1646

75

126

177

228

279

330

381

483

636

789

891

1146

100

126

152

178

204

230

256

308

386

464

516

646

126

126

126

126

126

126

126

126

126

126

126

126

   

Table 3b

   
   

E. coli Chronic WQBEL for Recreation P Classified Waters 

   
     

30E3 : Design Flow Dilution Ratio

   
     

0

1

2

3

4

5

6

7

8

9

10

15

20

   

1

205

409

613

817

1021

1225

1429

1633

1837

2041

2245

3265

4285

 

2

205

408

611

814

1017

1220

1423

1626

1829

2032

2235

3250

4265

 

3

205

407

609

811

1013

1215

1417

1619

1821

2023

2225

3235

4245

 

4

205

406

607

808

1009

1210

1411

1612

1813

2014

2215

3220

4225

5

205

405

605

805

1005

1205

1405

1605

1805

2005

2205

3205

4205

10

205

400

595

790

985

1180

1375

1570

1765

1960

2155

3130

4105

50

205

360

515

670

825

980

1135

1290

1445

1600

1755

2530

3305

100

205

350

495

640

785

930

1075

1220

1365

1510

1655

2380

3105

150

205

310

415

520

625

730

835

940

1045

1150

1255

1780

2305

205

205

205

205

205

205

205

205

205

205

205

205

205

205

 

Table 3c

 

E. coli Chronic WQBEL for Recreation N Classified Waters 

   

30E3 : Design Flow Dilution Ratio

   

0

1

2

3

4

5

10

15

 

1

630

1259

1888

2517

3146

3775

6920

10065

5

630

1255

1880

2505

3130

3755

6880

10005

10

630

1250

1870

2490

3110

3730

6830

9930

50

630

1210

1790

2370

2950

3530

6430

9330

100

630

1160

1690

2220

2750

3280

5930

8580

200

630

1060

1490

1920

2350

2780

4930

7080

300

630

960

1290

1620

1950

2280

3930

5580

400

630

860

1090

1320

1550

1780

2930

4080

500

630

760

890

1020

1150

1280

1930

2580

600

630

660

690

720

750

780

930

1080

630

630

630

630

630

630

630

630

630

Where the waters are non-designated, antidegradation considerations must be taken into account.  Therefore, either the following E. coli chronic 2-year average antidegradation based effluent average concentrations (ADBAC) from Tables 3d-3f will apply, or the chronic discharge requirement (effluent loading to stream) that was occurring because of this discharge as of September 30, 2000 (or other reviewable date), otherwise known as the Non-Impact Limit (NIL) will apply. Note that 0 CFU/100ml cannot be used in a geometric mean calculation, therefore 1 is used in the calculation even when the ambient is <1. BWQ is assumed to be 1.  

The shaded cells in the E. Coli ADBAC tables indicate that the result is greater than the allowed maximum, and therefore the limit will be set to 2,000 CFU/100mL. 

If the exact dilution ratio of a facility to stream flow is not shown on Tables 3d-3f below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge.

If the exact ambient concentration is not shown on Tables 3d-3f below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

   

Table 3d

   
   

E. coli ADBAC for Recreation E and U Classified Waters 

   
   

30E3 : Design Flow Dilution Ratio

   

0

1

2

3

4

5

7

10

20

30

40

50

75

 

1

20

39

57

76

95

114

151

207

395

582

770

957

1426

3

20

37

53

70

87

104

137

187

355

522

690

857

1276

5

20

35

49

64

79

94

123

167

315

462

610

757

1126

7

20

33

45

58

71

84

109

147

275

402

530

657

976

10

20

30

39

49

59

69

88

117

215

312

410

507

751

15

20

25

29

34

39

44

53

67

115

162

210

257

376

20

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

20(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the E. coli in the receiving stream.

   

Table 3e (Part 1)

 
   

E. coli ADBAC for Recreation P Classified Waters 

 
   

30E3 : Design Flow Dilution Ratio

 
   

0

1

2

3

4

5

7

10

 

1

32

62

93

123

154

185

246

338

2

32

61

91

120

150

180

239

328

3

32

60

89

117

146

175

232

318

4

32

59

87

114

142

170

225

308

5

32

58

85

111

138

165

218

298

10

32

53

75

96

118

140

183

248

15

32

48

65

81

98

115

148

198

20

32

43

55

66

78

90

113

148

25

32

38

45

51

58

65

78

98

32

32(A)

32(A)

32(A)

32(A)

32(A)

32(A)

32(A)

32(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the E. coli in the receiving stream

   

Table 3e (Part 2)

   
   

E. coli ADBAC for Recreation P Classified Waters

   
   

30E3: Design Flow Dilution Ratio

   
   

15

20

30

40

50

60

70

80

90

 

1

491

644

950

1256

1562

1868

2327

2480

2786

2

476

624

920

1216

1512

1808

2252

2400

2696

3

461

604

890

1176

1462

1748

2177

2320

2606

4

446

584

860

1136

1412

1688

2102

2240

2516

5

431

564

830

1096

1362

1628

2027

2160

2426

10

356

464

680

896

1112

1328

1652

1760

1976

15

281

364

530

696

862

1028

1277

1360

1526

20

206

264

380

496

612

728

902

960

1076

25

131

164

230

296

362

428

527

560

626

32

32(A

32(A

32(A

32(A

32(A

32(A

32(A

32(A

32(A

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the E. coli in the receiving stream

     

Table 3f

     
     

E. coli ADBAC for Recreation N Classified Waters 

     
     

30E3 : Design Flow Dilution Ratio

     

0

1

2

3

4

5

7

10

15

20

25

 

1

95

190

284

378

473

567

756

1039

1511

1982

2454

2

95

189

282

375

469

562

749

1029

1496

1962

2429

3

95

188

280

372

465

557

742

1019

1481

1942

2404

4

95

187

278

369

461

552

735

1009

1466

1922

2379

5

95

186

276

366

457

547

728

999

1451

1902

2354

10

95

181

266

351

437

522

693

949

1376

1802

2229

20

95

171

246

321

397

472

623

849

1226

1602

1979

95

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

95(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the E. coli in the receiving stream.

b. Effluent limitations for Total Residual Chlorine

The following chronic 30-day average and acute 1-day average total residual chlorine WQBELs, shown in Tables 4a and 4b below, will apply based on the appropriate dilution and upstream water quality. The shaded cells in the chronic and acute TRC tables indicate that the calculated TRC limit is greater than the Regulation 62 TRC limit of 0.5 mg/l, and therefore the WQBEL will be set to 0.5 mg/l. 

If the exact dilution ratio of a facility to stream flow is not shown on Tables 4a-4b below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge.

If the exact ambient concentration is not shown on Tables 4a-4b below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

   

Table 4a

 
   

Chronic Total Residual Chlorine WQBEL for Aquatic Life Classified Waters 

 

 

 

30E3: Design Flow Dilution Ratio 

 

0

1

2

3

4

5

7

10

15

20

25

30

40

50

 

0

0.011

0.022

0.033

0.044

0.055

0.066

0.088

0.121

0.176

0.231

0.286

0.341

0.451

0.561

0.001

0.011

0.021

0.031

0.041

0.051

0.061

0.081

0.111

0.161

0.211

0.261

0.311

0.411

0.511

0.002

0.011

0.020

0.029

0.038

0.047

0.056

0.074

0.101

0.146

0.191

0.236

0.281

0.371

0.461

0.003

0.011

0.019

0.027

0.035

0.043

0.051

0.067

0.091

0.131

0.171

0.211

0.251

0.331

0.411

0.004

0.011

0.018

0.025

0.032

0.039

0.046

0.060

0.081

0.116

0.151

0.186

0.221

0.291

0.361

0.005

0.011

0.017

0.023

0.029

0.035

0.041

0.053

0.071

0.101

0.131

0.161

0.191

0.251

0.311

0.01

0.011

0.012

0.013

0.014

0.015

0.016

0.018

0.021

0.026

0.031

0.036

0.041

0.051

0.061

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

0.011

 

Table 4b

 
 

Acute Total Residual Chlorine WQBEL for Aquatic Life Classified Waters (mg/l) 

 

 

 

1E3: Design Flow Dilution Ratio 

 

0

1

2

3

4

5

7

10

15

20

25

30

50

 

0

0.019

0.038

0.057

0.076

0.095

0.11

0.15

0.21

0.30

0.40

0.49

0.59

0.97

0.001

0.019

0.037

0.055

0.073

0.091

0.11

0.15

0.20

0.29

0.38

0.47

0.56

0.92

0.002

0.019

0.036

0.053

0.070

0.087

0.10

0.14

0.19

0.27

0.36

0.44

0.53

0.87

0.003

0.019

0.035

0.051

0.067

0.083

0.099

0.13

0.18

0.26

0.34

0.42

0.50

0.82

0.004

0.019

0.034

0.049

0.064

0.079

0.094

0.12

0.17

0.24

0.32

0.39

0.47

0.77

0.005

0.019

0.033

0.047

0.061

0.075

0.089

0.12

0.16

0.23

0.30

0.37

0.44

0.72

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

0.019

Where the waters are non-designated, antidegradation considerations must be taken into account.  Therefore, either the following TRC chronic 2-year average antidegradation based effluent average concentrations (ADBAC) from Table 4c will apply, or the chronic discharge requirement (effluent loading to stream) that was occurring because of this discharge as of September 30, 2000 (or other reviewable date), otherwise known as the Non-Impact Limit (NIL) will apply. Note that the TRC BWQ is set to zero.

If the exact dilution ratio of a facility to stream flow is not shown on Table 4c below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. Note that Table 4c is split into two tables.

If the exact ambient concentration is not shown on Table 4c below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

Table 4c - PART 1

Total Residual Chlorine ADBAC for Aquatic Life Classified Waters (mg/l)  

 

 

30E3: Design Flow Dilution Ratio 

   

0

1

2

5

10

15

 

0

0.0017

0.0033

0.0050

0.0099

0.018

0.026

0.001

0.0017

0.0023

0.0030

0.0049

0.0082

0.011

0.0015

0.0017

0.0018

0.0020

0.0024

0.0032

0.0039

0.0017

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the TRC in the receiving stream.

Table 4c - PART 2

Total Residual Chlorine ADBAC for Aquatic Life Classified Waters (mg/l)

 

 

30E3: Design Flow Dilution Ratio 

   

20

30

40

50

70

90

 

0

0.035

0.051

0.068

0.084

0.12

0.15

0.001

0.015

0.021

0.028

0.034

0.047

0.060

0.0015

0.0046

0.0062

0.0076

0.0091

0.012

0.015

0.0017

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

0.0017(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the TRC in the receiving stream.

c. Effluent limitations for Total Inorganic Nitrogen (TIN)

The following acute 1-day average total inorganic Nitrogen (TIN) WQBELs, shown in Table 5a below, will apply for receiving streams that are classified for water supply and are based on the appropriate dilution and upstream water quality. 

The shaded cells in the WQBEL TIN table indicates that the calculated TIN limit is greater than the maximum TIN limit allowed by the division, and the TIN WQBEL will be set to 100 mg/l. 

For facilities that discharge to streams only classified for Agriculture and not classified as Water Supply, the WQBEL will be set to 100 mg/l, regardless of ambient TIN concentration and dilution ratio.  

If the exact dilution ratio of a facility to stream flow is not shown on Tables 5a below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

If the exact ambient concentration is not shown on Table 5a below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

   

Table 5a

   
   

Acute Total Inorganic Nitrogen for Water Supply Classified Waters (mg/l)

   

 

 

1E3: Design Flow Dilution Ratio 

   
   

0

0.25

0.5

0.75

1

2

3

4

5

7

9

10

15

20

25

30

 

0

10

13

15

18

20

30

40

50

60

80

100

110

160

210

260

310

0.5

10

12

15

17

20

29

39

48

58

77

96

105

153

200

248

295

1

10

12

15

17

19

28

37

46

55

73

91

100

145

190

235

280

2

10

12

14

16

18

26

34

42

50

66

82

90

130

170

210

250

3

10

12

14

15

17

24

31

38

45

59

73

80

115

150

185

220

4

10

12

13

15

16

22

28

34

40

52

64

70

100

130

160

190

5

10

11

13

14

15

20

25

30

35

45

55

60

85

110

135

160

7

10

11

12

12

13

16

19

22

25

31

37

40

55

70

85

100

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

10

Where the waters are non-designated, antidegradation considerations must be taken into account.  Therefore, either the following TIN chronic 2-year average antidegradation based effluent average concentrations (ADBAC) from Table 5b will apply, or the acute discharge requirement (effluent loading to stream) that was occurring because of this discharge as of September 30, 2000 (or other reviewable date), otherwise known as the Non-Impact Limit (NIL) will apply. Note that the TIN BWQ is assumed to be zero. The shaded cells in the ADBAC TIN table indicates that the calculated TIN limit is greater than the maximum TIN limit allowed by the division, and the TIN WQBEL will be set to 100 mg/l.

If the exact dilution ratio of a facility to stream flow is not shown on Table 5b below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge.

If the exact ambient concentration is not shown on Table 5b (Part 1 and Part 2) below, the next higher ambient concentration will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. 

 

Table 5b - PART 1

 
 

Total Inorganic Nitrogen ADBAC for Water Supply Classified Waters (mg/l)

 
   

1E3: Design Flow Dilution Ratio

 
   

0

0.5

1

2

3

4

5

6

7

8

9

10

 

0

1.5

2.3

3.0

4.5

6.0

7.5

9.0

11

12

14

15

17

0.25

1.5

2.1

2.8

4.0

5.3

6.5

7.8

9.0

10

12

13

14

0.5

1.5

2.0

2.5

3.5

4.5

5.5

6.5

7.5

8.5

9.5

11

12

1

1.5

1.8

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

1.25

1.5

1.6

1.8

2.0

2.3

2.5

2.8

3.0

3.3

3.5

3.8

4.0

1.5

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the TIN in the receiving stream.

Table 5b – PART 2

Total Inorganic Nitrogen ADBAC for Water Supply Classified Waters (mg/l)

   

1E3: Design Flow Dilution Ratio

   

12

15

20

30

40

50

60

70

80

90

 

0

20

24

32

47

62

77

92

107

122

137

0.25

17

20

27

39

52

64

77

89

102

114

0.5

14

17

22

32

42

52

62

72

82

92

1

7.5

9.0

12

17

22

27

32

37

42

47

1.25

4.5

5.3

6.5

9.0

12

14

17

19

22

24

1.5

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

1.5(A)

(A)The ADBAC is set equal to the SCT because there is no assimilative capacity for the TIN in the receiving stream.

d. Effluent Limitations for Total Ammonia

The following chronic 30-day average (Tables 6a-6d) total ammonia WQBELs will apply based on the appropriate 30E:3 dilution ratio and month. Tables are divided by Cold/Warm water and Mechanical/Non-Mechanical facilities designations. Note that the ambient ammonia concentration is set to 0.01 mg/l to reflect typical ambient ammonia concentrations. 

The shaded cells in the Ammonia WQBEL tables indicate that the calculated limit is greater than the maximum Ammonia limit allowed by the division, and therefore the Ammonia WQBEL will be set to 50 mg/l.

If the exact dilution ratio of a facility to stream flow is not shown on Tables 6a-6d below, the next lower dilution ratio will be used in the selection of the limit, in order to be protective of the receiving stream at the point of discharge.

 

Table 6a (Part 1)

 
 

Ammonia Cold Water Chronic WQBELs for a Mechanical Facility (mg/l)

 

 

30E3: Design Flow

 
 

0

1

2

3

4

5

6

7

8

9

10

JAN

4.3

5.9

5.4

5.5

5.8

6.1

6.5

6.9

7.4

7.9

8.4

FEB

4.5

6.7

6.2

6.2

6.3

6.7

7.0

7.5

7.9

8.4

8.8

MAR

3.7

5.5

6.5

6.8

7.1

7.5

7.9

8.4

8.8

9.3

10

APR

3.3

5.0

6.6

8.1

9.1

10

10

11

11

12

12

MAY

3.5

5.5

7.3

9.0

10

10

10

11

11

12

13

JUNE

3.6

5.7

7.6

10

11

13

14

16

16

17

17

JULY

3

4.8

6.4

7.9

9.4

10

12

13

15

16

17

AUG

3.2

4.9

6.2

7.5

8.7

10

11

12

13

14

15

SEP

3.8

5.3

6.6

7.7

8.8

10

11

12

13

14

14

OCT

4

6.2

8.0

10

10

11

11

12

12

13

13

NOV

4.1

6.4

7.1

7.1

7.3

7.6

8.0

8.4

8.9

9.4

10

DEC

4

5.5

5.2

5.4

5.7

6.1

6.6

7.1

7.6

8.1

8.6

                     

Table 6a (Part 2)

Ammonia Cold Water Chronic WQBELs for a Mechanical Facility (mg/l)

 

30E3: Design Flow

 

15

20

25

30

40

50

60

70

80

90

JAN

11

13

15

18

22

27

31

35

40

44

FEB

11

14

16

18

23

27

32

36

40

45

MAR

13

15

18

20

25

29

34

39

43

48

APR

17

20

22

25

30

35

40

45

50

50

MAY

17

20

22

25

30

35

40

46

50

50

JUNE

23

25

28

30

36

41

46

50

50

50

JULY

24

26

27

29

34

38

42

47

50

50

AUG

23

24

26

28

31

35

39

43

47

50

SEP

21

22

24

26

29

33

37

41

45

48

OCT

17

19

22

24

30

35

40

44

50

50

NOV

13

15

17

20

25

29

34

39

44

48

DEC

11

13

16

18

23

28

32

37

41

46

 

Table 6b (Part 1)

 
 

Ammonia Cold Water Chronic WQBELs for a Non-Mechanical Facility

 

 

30E3: Design Flow

 
 

0

1

2

3

4

5

6

7

8

9

10

JAN

4.3

5.9

5.4

5.5

5.8

6.1

6.5

6.9

7.4

7.9

8.4

FEB

4.5

6.7

6.2

6.2

6.3

6.7

7.0

7.5

7.9

8.4

8.8

MAR

3.7

5.5

6.5

6.8

7.1

7.5

7.9

8.4

8.8

9.3

10

APR

3.3

5.0

6.6

8.1

9.1

10

10

11

11

12

12

MAY

3.5

5.5

7.3

9.0

10

10

10

11

11

12

13

JUNE

3.6

5.7

7.6

10

11

13

14

16

16

17

17

JULY

3.0

4.8

6.4

7.9

9.4

10

12

13

15

16

17

AUG

3.2

4.9

6.2

7.5

8.7

10

11

12

13

14

15

SEP

3.8

5.3

6.6

7.7

8.8

10

11

12

13

14

14

OCT

4.0

6.2

8.0

10

10

11

11

12

12

13

13

NOV

4.1

6.4

7.1

7.1

7.3

7.6

8.0

8.4

8.9

9.4

10

DEC

4.0

5.5

5.2

5.4

5.7

6.1

6.6

7.1

7.6

8.1

8.6

Table 6b (Part 2)

Ammonia Cold Water Chronic WQBELs for a Non-Mechanical Facility (mg/l)

 

30E3: Design Flow

 

15

20

25

30

40

50

60

70

80

90

JAN

10

13

15

17

22

26

31

35

40

44

FEB

11

13

15

18

22

27

31

36

40

45

MAR

12

14

17

19

24

29

33

38

43

48

APR

15

18

21

24

29

34

39

45

50

50

MAY

15

18

21

24

29

34

40

45

50

50

JUNE

20

23

26

29

34

40

46

50

50

50

JULY

20

22

25

27

32

37

41

46

50

50

AUG

18

20

22

25

29

33

37

42

46

50

SEP

17

19

21

23

27

32

36

39

43

47

OCT

16

18

21

23

29

34

39

44

49

50

NOV

12

14

17

19

24

29

34

39

43

48

DEC

11

13

16

18

23

27

32

36

41

46

Table 6c (Part 1)

 

Ammonia Warm Water Chronic WQBELs for a Mechanical Facility (mg/l)

 

 

30E3: Design Flow

 
 

0

1

2

3

4

5

6

7

8

9

10

JAN

7.2

13

12

12

12

13

13

14

15

15

16

FEB

7.7

13

15

14

14

14

15

15

16

17

18

MAR

6.7

10

13

15

15

14

15

15

15

16

16

APR

4.6

7.4

9.8

11

13

15

17

18

18

19

19

MAY

4.8

7.7

10

12

14

15

17

19

20

21

21

JUNE

4.8

6.8

8.5

10

11

12

14

15

16

18

19

JULY

4.3

5.9

7.3

8.6

10

10

11

13

14

15

16

AUG

4.5

6.2

7.5

8.7

10

10

11

12

13

14

15

SEP

4.6

6.6

8.2

10

11

12

13

15

16

17

18

OCT

5.1

8.6

11

13

16

18

20

20

21

21

21

NOV

5.6

10

14

14

14

14

14

15

15

16

16

DEC

6.7

12

12

11

11

12

12

13

14

14

15

Table 6c (Part 2)

Ammonia Warm Water Chronic WQBELs for a Mechanical Facility (mg/l)

 

30E3: Design Flow

 

15

20

25

30

40

50

60

70

80

90

JAN

20

24

28

33

41

49

50

50

50

50

FEB

22

26

30

34

43

50

50

50

50

50

MAR

19

22

25

29

35

41

48

50

50

50

APR

22

25

28

30

36

42

48

50

50

50

MAY

23

25

28

30

35

40

44

49

50

50

JUNE

25

29

31

33

36

40

44

47

50

50

JULY

21

26

30

34

38

42

45

48

50

50

AUG

20

24

29

32

37

41

43

46

49

50

SEP

24

30

33

35

38

42

45

49

50

50

OCT

23

26

29

31

37

42

47

50

50

50

NOV

20

24

27

31

39

46

50

50

50

50

DEC

19

23

27

32

40

48

50

50

50

50

Table 6d (Part 1)

Ammonia Warm Water Chronic WQBELs for a Non-Mechanical Facility (mg/l)

 

30E3: Design Flow

 

0

1

2

3

4

5

6

7

8

9

10

JAN

7.0

10

10

10

10

11

12

12

13

14

15

FEB

7.3

11

11

11

12

12

13

14

15

16

17

MAR

6.0

8.9

10

10

11

11

12

12

13

14

14

APR

3.3

5.3

7.2

9.1

10

12

13

14

15

16

16

MAY

3.5

5.5

7.3

9.1

10

12

14

15

16

17

18

JUNE

3.6

5.0

6.3

7.6

8.8

10

11

12

13

15

16

JULY

3.0

3.9

4.9

5.9

6.9

7.9

8.8

10

10

11

12

AUG

3.2

4.1

5.0

5.8

6.7

7.6

8.4

9.3

10

11

11

SEP

3.8

5.0

6.2

7.4

8.6

10

11

12

13

14

15

OCT

5.1

7.7

10

12

14

16

17

17

18

18

19

NOV

6.6

10

11

11

12

12

13

13

14

15

16

DEC

6.5

10

9.1

9.3

10

10

11

12

13

13

14

Table 6d (Part 2)

Ammonia Warm Water Chronic WQBELs for a Non-Mechanical Facility (mg/l)

 

30E3: Design Flow

 

15

20

25

30

40

50

60

70

80

90

JAN

19

23

28

32

40

49

50

50

50

50

FEB

21

25

30

34

42

50

50

50

50

50

MAR

18

21

25

28

34

41

47

50

50

50

APR

20

23

26

29

35

41

47

50

50

50

MAY

21

23

26

29

34

39

44

48

50

50

JUNE

22

25

28

30

34

38

42

46

50

50

JULY

17

22

27

30

35

39

42

45

49

50

AUG

16

20

24

28

33

37

40

43

46

49

SEP

21

26

29

32

36

40

44

47

50

50

OCT

22

25

27

30

36

41

47

50

50

50

NOV

19

23

27

31

38

46

50

50

50

50

DEC

18

22

27

31

39

47

50

50

50

50

The following acute 1-day average total ammonia WQBELs in Tables 6e-6h will apply based on the appropriate 1E3 dilution ratio and month. Tables are divided by Cold/Warm water and Mechanical/Non-Mechanical facilities designations. The shaded cells in the Ammonia WQBEL tables indicate that the calculated limit is greater than the maximum Ammonia limit allowed by the division, and therefore the Ammonia WQBEL will be set to 50 mg/l. Note that the ambient ammonia concentration is set to 0.01 mg/l to reflect typical ambient ammonia concentrations. 

If the exact dilution ratio of a facility to stream flow is not shown on Tables 6e-6h below, the next lower dilution ratio will be used in the selection of the limit in order to be protective of the receiving stream at the point of discharge. Note that the acute ammonia tables do not have dilution ratios greater than 50:1 because at higher dilutions, the resulting selection is greater than the 50 mg/l division allowable limit.

   

Table 6e

   
   

Ammonia Cold Water Acute WQBELs for a Mechanical Facility (mg/l)

   
   

1E3: Design Flow

   
 

0

1

2

3

4

5

6

7

8

9

10

15

20

25

30

40

50

JAN

16

19

15

13

13

13

14

15

15

16

17

21

26

30

35

44

50

FEB

18

22

17

15

15

15

15

16

17

17

18

22

27

31

36

45

50

MAR

15

21

21

19

19

18

19

19

20

21

21

26

30

35

39

49

50

APR

14

20

24

25

26

26

26

27

27

28

28

33

38

43

48

50

50

MAY

15

21

26

27

26

26

26

26

27

27

28

33

38

43

48

50

50

JUNE

16

23

28

32

36

39

40

41

42

43

43

47

50

50

50

50

50

JULY

17

23

28

32

36

40

43

47

50

50

50

50

50

50

50

50

50

AUG

18

25

30

34

37

41

44

47

50

50

50

50

50

50

50

50

50

SEP

17

23

27

30

33

36

39

42

44

46

48

50

50

50

50

50

50

OCT

15

21

26

28

28

27

27

27

28

28

29

33

37

42

47

50

50

NOV

15

21

19

17

17

17

17

18

18

19

20

25

29

34

39

49

50

DEC

15

18

14

13

13

13

14

15

15

16

17

22

27

31

36

45

50

 

Table 6f

   
 

Ammonia Cold Water Acute WQBELs for a Non-Mechanical Facility (mg/l)

   
 

1E3: Design Flow

   
 

0

1

2

3

4

5

6

7

8

9

10

15

20

25

30

40

50

JAN

13

11

10

10

10

11

12

13

14

15

16

20

25

30

34

43

50

FEB

14

12

11

11

11

12

13

14

15

16

16

21

26

30

35

44

50

MAR

10

12

12

12

13

14

15

15

16

17

18

23

28

33

38

48

50

APR

8.5

12

14

16

17

18

19

20

21

22

24

29

35

40

46

50

50

MAY

9.4

13

16

17

18

19

20

21

22

23

24

30

35

41

46

50

50

JUNE

9.9

14

18

22

26

28

30

32

33

35

36

42

48

50

50

50

50

JULY

9.0

12

16

19

23

26

30

33

36

38

40

49

50

50

50

50

50

AUG

9.8

13

16

19

22

25

27

30

33

35

37

45

50

50

50

50

50

SEP

10

14

16

19

22

24

27

29

32

34

36

43

49

50

50

50

50

OCT

11

15

19

20

20

21

22

22

23

24

25

30

35

40

46

50

50

NOV

12

14

13

13

13

14

15

16

17

18

18

23

28

33

38

48

50

DEC

11

10

9.7

10

10

11

12

13

14

15

16

21

26

31

35

45

50

   

Table 6g

   
   

Ammonia Warm Water Acute WQBELs for a Mechanical Facility (mg/l)

   
   

1E3: Design Flow

   
 

0

1

2

3

4

5

6

7

8

9

10

15

20

25

30

40

50

JAN

16

20

16

14

14

15

15

16

17

17

18

23

27

32

37

46

50

FEB

18

25

21

19

19

19

19

20

21

21

22

27

32

37

42

50

50

MAR

15

21

25

24

24

24

24

25

25

26

27

31

36

41

46

50

50

APR

14

21

25

30

32

33

34

35

35

36

37

42

48

50

50

50

50

MAY

15

21

26

31

35

39

42

44

46

47

49

50

50

50

50

50

50

JUNE

16

22

27

31

35

39

43

47

50

50

50

50

50

50

50

50

50

JULY

17

23

28

32

36

40

43

47

50

50

50

50

50

50

50

50

50

AUG

18

25

30

34

38

42

45

49

50

50

50

50

50

50

50

50

50

SEP

17

23

28

33

37

41

45

49

50

50

50

50

50

50

50

50

50

OCT

15

22

27

32

37

39

41

42

43

44

45

49

50

50

50

50

50

NOV

15

21

23

22

21

21

21

22

23

23

24

29

34

39

44

50

50

DEC

15

20

16

15

15

15

15

16

17

17

18

22

27

31

36

45

50

   

Table 6g

   
   

Ammonia Warm Water Acute WQBELs for a Non-Mechanical Facility (mg/l)

   
   

1E3: Design Flow

   
 

0

1

2

3

4

5

6

7

8

9

10

15

20

25

30

40

50

JAN

13

11

11

11

11

12

13

14

15

16

17

22

27

31

36

46

50

FEB

14

15

14

14

15

15

16

17

18

19

20

25

31

36

41

50

50

MAR

10

13

15

16

17

17

18

19

20

21

23

28

33

39

44

50

50

APR

8.5

12

17

20

22

24

26

27

29

30

31

38

44

50

50

50

50

MAY

9.4

13

17

21

25

28

31

34

36

38

40

47

50

50

50

50

50

JUNE

9.9

14

17

21

25

28

32

36

39

43

46

50

50

50

50

50

50

JULY

9.0

12

16

19

23

26

30

33

36

40

43

50

50

50

50

50

50

AUG

9.8

13

17

20

23

26

29

32

35

39

42

50

50

50

50

50

50

SEP

10

15

18

22

26

30

33

37

41

45

48

50

50

50

50

50

50

OCT

11

16

21

25

29

31

33

35

36

37

39

45

50

50

50

50

50

NOV

12

16

16

16

17

17

18

19

20

21

22

27

32

38

43

50

50

DEC

11

11

11

11

11

12

13

14

14

15

16

21

25

30

35

44

50

           

Where the waters are non-designated, antidegradation considerations must be taken into account.  Therefore, either the following ammonia chronic 2-year average antidegradation based effluent average concentrations (ADBAC) from Tables 6i-6l will apply, or the chronic discharge requirement (effluent loading to stream) that was occurring because of this discharge as of September 30, 2000 (or other reviewable date), otherwise known as the Non-Impact Limit (NIL) will apply. Note that the ambient ammonia concentration is set to 0.01 mg/l and the BWQ is set to be zero to reflect typical ambient ammonia concentrations. 

If the exact dilution ratio of a facility to stream flow is not shown on Tables 6i-6l below, the next lower dilution ratio will be used in the selection of the limit, in order to be protective of the receiving stream at the point of discharge.

   

Table 6i

   
   

Monthly Total Ammonia Cold Water ADBAC for Mechanical Facilities (mg/l)

   

 

 

30E3:Design Flow

   
 

0

1

2

4

7

10

15

20

25

30

40

50

60

70

80

90

JAN

0.8

1.2

1.6

1.8

2.0

2.2

2.6

3.0

3.4

3.8

4.6

5.4

6.2

6.9

7.7

8.5

FEB

0.8

1.3

1.7

2.0

2.2

2.4

2.8

3.2

3.6

4.0

4.8

5.6

6.3

7.1

7.8

8.6

MAR

0.8

1.2

1.5

2.0

2.4

2.7

3.2

3.7

4.2

4.6

5.5

6.3

7.2

8.0

8.8

9.6

APR

0.7

1.1

1.4

2.0

2.7

3.3

4.1

4.7

5.4

6.0

7.1

8.1

9.1

10

11

12

MAY

0.8

1.2

1.5

2.1

2.9

3.5

4.2

4.9

5.5

6.1

7.2

8.2

9.2

10

11

12

JUNE

0.8

1.2

1.6

2.2

3.1

3.9

5.2

6.2

7.1

7.8

9.2

10

11

12

13

14

JULY

0.7

1.1

1.5

2.0

2.8

3.5

4.6

5.7

6.6

7.4

8.8

10

11

12

13

14

AUG

0.7

1.2

1.5

2.0

2.7

3.2

4.2

5.1

5.9

6.6

7.9

9.1

10

11

12

13

SEP

0.7

1.1

1.4

1.9

2.4

3.0

3.8

4.6

5.3

6.0

7.2

8.4

9.4

10

11

12

OCT

0.8

1.2

1.5

2.1

2.8

3.3

4.1

4.7

5.3

5.9

6.9

7.9

8.9

9.8

10

11

NOV

0.7

1.2

1.5

2.0

2.3

2.7

3.2

3.6

4.1

4.5

5.4

6.3

7.2

8.0

8.8

9.7

DEC

0.7

1.2

1.5

1.7

2.0

2.3

2.7

3.1

3.6

4.0

4.9

5.7

6.5

7.3

8.1

8.9

 

Table 6j

   
 

Monthly Total Ammonia Cold Water ADBAC for Non-Mechanical Facilities (mg/l)

   

 

30E3:Design Flow

   

0

1

2

4

7

10

15

20

25

30

40

50

60

70

80

90

JAN

0.7

1.0

1.3

1.4

1.7

2.0

2.4

2.8

3.3

3.7

4.5

5.3

6.1

6.8

7.6

8.3

FEB

0.7

1.1

1.4

1.6

1.8

2.1

2.5

3.0

3.4

3.8

4.6

5.4

6.2

7.0

7.7

8.5

MAR

0.6

0.9

1.1

1.5

1.9

2.3

2.8

3.4

3.8

4.3

5.2

6.1

6.9

7.8

8.6

9.4

APR

0.5

0.8

1.0

1.5

2.1

2.7

3.5

4.3

4.9

5.6

6.7

7.8

8.8

10

10

11

MAY

0.6

0.9

1.1

1.6

2.4

2.9

3.7

4.4

5.1

5.7

6.8

7.9

8.9

10

10

11

JUNE

0.6

0.9

1.2

1.7

2.5

3.3

4.6

5.6

6.6

7.4

8.8

10

11

12

13

14

JULY

0.5

0.8

1.0

1.5

2.1

2.8

3.9

4.9

5.9

6.7

8.2

10

10

12

13

14

AUG

0.5

0.8

1.0

1.4

1.9

2.4

3.3

4.1

5.0

5.7

7.1

8.4

10

10

11

12

SEP

0.6

0.8

1.0

1.4

1.9

2.3

3.1

3.9

4.6

5.3

6.6

7.8

8.9

10

10

11

OCT

0.6

1.0

1.2

1.7

2.4

2.9

3.7

4.3

5.0

5.6

6.7

7.7

8.6

9.6

10

11

NOV

0.7

1.0

1.3

1.7

2.1

2.4

3.0

3.4

3.9

4.4

5.3

6.2

7.1

7.9

8.8

9.6

DEC

0.6

1.0

1.2

1.4

1.8

2.1

2.5

3.0

3.5

3.9

4.8

5.6

6.4

7.2

8.0

8.8

   

Table 6k

   
   

Monthly Total Ammonia Warm Water ADBAC for Mechanical Facilities (mg/l)

   

 

 

30E3:Design Flow Dilution Ratio

   

0

1

2

4

7

10

15

20

25

30

40

50

60

70

80

90

JAN

1.1

2.0

2.6

2.8

3.1

3.5

4.2

4.8

5.6

6.2

7.6

9.0

10

11

13

14

FEB

1.2

2.1

2.8

3.3

3.7

4.1

4.8

5.5

6.3

7.0

8.4

9.9

11

12

14

15

MAR

1.1

1.6

2.1

2.9

3.5

3.9

4.6

5.3

5.9

6.5

7.7

8.9

10

11

12

13

APR

0.7

1.2

1.5

2.1

3.0

3.8

5.0

5.9

6.8

7.5

9.0

10

11

12

13

14

MAY

0.8

1.2

1.5

2.2

3.0

3.8

5.1

6.1

6.9

7.7

9.2

10

11

13

14

15

JUNE

0.8

1.1

1.3

1.8

2.4

2.9

3.9

4.8

5.8

6.7

8.5

10

11

12

14

15

JULY

0.7

0.9

1.1

1.5

2.0

2.5

3.2

3.9

4.7

5.4

6.9

8

10

11

12

13

AUG

0.7

1.0

1.2

1.5

2.0

2.4

3.1

3.7

4.4

5.0

6.3

7.6

9

10

11

12

SEP

0.7

1.0

1.3

1.7

2.3

2.8

3.8

4.7

5.5

6.4

8.2

9.9

11

12

14

15

OCT

0.8

1.3

1.7

2.5

3.5

4.5

5.6

6.5

7.4

8.1

9.6

10

12

13

14

15

NOV

0.9

1.6

2.2

3.0

3.5

4.0

4.7

5.4

6.0

6.7

8.0

9.3

10

11

13

14

DEC

1.0

1.8

2.3

2.6

3.0

3.3

3.9

4.6

5.3

6.0

7.3

8.6

9.9

11

12

13

 

Table 6l

 
 

Monthly Total Ammonia Warm Water ADBAC for Non-Mechanical Facilities (mg/l)

 

 

30E3:Design Flow Dilution Ratio

 

0

1

2

4

7

10

15

20

25

30

40

50

60

70

80

90

JAN

1.1

1.7

2.0

2.3

2.7

3.2

3.9

4.6

5.3

6.1

7.5

8.9

10

11

12

14

FEB

1.1

1.8

2.3

2.8

3.2

3.7

4.5

5.3

6.1

6.8

8.3

9.8

11

12

13

15

MAR

0.9

1.4

1.7

2.3

2.9

3.4

4.2

4.9

5.6

6.2

7.4

8.6

9.8

10

12

13

APR

0.5

0.8

1.1

1.7

2.5

3.3

4.5

5.4

6.3

7.1

8.6

10

11

12

13

14

MAY

0.6

0.9

1.1

1.7

2.4

3.2

4.5

5.5

6.4

7.3

8.8

10

11

12

13

14

JUNE

0.6

0.8

1.0

1.4

1.9

2.5

3.4

4.3

5.3

6.2

8.0

10

11

12

13

15

JULY

0.5

0.6

0.8

1.1

1.5

1.9

2.7

3.4

4.1

4.9

6.3

7.8

9.2

10

12

13

AUG

0.5

0.7

0.8

1.0

1.4

1.8

2.5

3.1

3.7

4.4

5.7

7.0

8.2

9.5

10

12

SEP

0.6

0.8

1.0

1.3

1.9

2.4

3.3

4.2

5.1

5.9

7.7

9.4

11

12

13

15

OCT

0.8

1.2

1.6

2.2

3.2

4.1

5.2

6.2

7.0

7.9

9.3

10

11

13

14

15

NOV

1.0

1.6

2.1

2.6

3.2

3.7

4.4

5.2

5.9

6.5

7.9

9.2

10

11

13

14

DEC

1.0

1.5

1.9

2.2

2.6

3.0

3.7

4.4

5.1

5.8

7.1

8.4

9.7

11

12

13

4. New Facilities With Design Flows Of Less Than 1.0 MGD

The limits that follow apply to new treatment facilities.  New treatment facility means any domestic wastewater treatment facility on a new site that is not an “existing treatment facility” and commences discharge to surface water, or receives PELs, after May 31, 2012 in addition to the applicable influent and effluent limits in Parts I.B.2 and I.B.3 of this permit. Existing Treatment facility means any existing domestic wastewater treatment facility that commenced discharge or received PELs or site approval prior to May 31, 2012 for groundwater discharge, surface water discharge, or a non-discharging facility; or that applied for a Notice of Authorization for the application of reclaimed water prior to May 31, 2012.

a. The following annual median and 95th percentile total inorganic nitrogen and total phosphorus technologybased effluent limitations will apply based on Regulation 85.

Table 7a

Regulation 85 Technology-Based Effluent Limits for New Domestic Wastewater Treatment Works 

Parameter

Annual Median(A)

95th Percentile(B)

Total Phosphorus (mg/l)

0.7

1.75

Total Inorganic Nitrogen (mg/l)

7

14

  • (A) Reported as a running annual median, which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85
  • (B) Reported as the 95th percentile of all samples taken in the most recent 12 calendar months including samples collected in accordance with Regulation 85

For discharges to classified streams, the following annual median total nitrogen WQBELs (Table 7b for Cold Water streams, and Table 7c for Warm Water streams) will apply for new facilities based on the appropriate upstream water quality and the interim nutrient water quality standards in Regulation 31.17. If the selected Total Nitrogen WQBEL is in the shaded portion of the table, the division will automatically apply the annual median technology-based effluent TIN limitations from Table 7a (Parts 1 & 2) instead. Regulation 31 Total Nitrogen limits will not apply to discharges to unclassified streams.  

Table 7b - PART 1

Total Nitrogen WQBEL(A) for New Facilities Discharging into Cold Water Classified Streams

 

 

1E5:Design Flow

   

0

1

2

3

4

5

6

7

8

9

10

 

0

1.25

2.5

3.75

5

6.25

7.5

8.75

10

11.25

12.5

13.75

0.1

1.25

2.4

3.55

4.7

5.85

7

8.15

9.3

10.5

11.6

12.75

0.2

1.25

2.3

3.35

4.4

5.45

6.5

7.55

8.6

9.65

10.7

11.75

0.5

1.25

2

2.75

3.5

4.25

5

5.75

6.5

7.25

8

8.75

1

1.25

1.5

1.75

2

2.25

2.5

2.75

3

3.25

3.5

3.75

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

(A)Reported as a running annual median, which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85

Table 7b - PART 2

Total Nitrogen WQBEL(A) for New Facilities Discharging into Cold Water Classified Streams

 

 

1E5:Design Flow

   

12

15

20

25

30

40

50

60

70

80

90

 

0

16.3

20.0

26.3

32.5

38.8

51.3

63.8

76.3

88.8

101 (B)

114(B)

0.1

15.1

18.5

24.3

30.0

35.8

47.3

58.8

70.3

81.8

93.3

105(B)

0.2

13.9

17.0

22.3

27.5

32.8

43.3

53.8

64.3

74.8

85.3

95.8

0.5

10.3

12.5

16.3

20.0

23.8

31.3

38.8

46.3

53.8

61.3

68.8

1

4.25

5.00

6.25

7.50

8.75

11.3

13.8

16.3

18.8

21.3

23.8

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

1.25

(A)Reported as a running annual median, which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85

(B) Total Nitrogen effluent limitation is capped at 100 mg/l in accordance with division practice. 

Table 7c - PART 1

Total Nitrogen WQBEL(A) for New Facilities Discharging into Warm Water Classified Streams

 

 

1E5:Design Flow

   

0

1

2

3

4

5

6

7

8

9

10

 

0

2.01

4.02

6.03

8.04

10.1

12.1

14.1

16.1

18.1

20

22

0.1

2.01

3.92

5.83

7.74

9.65

11.6

13.5

15.4

17.3

19.2

21

0.2

2.01

3.82

5.63

7.44

9.25

11.1

12.9

14.7

16.5

18.3

20

0.5

2.01

3.52

5.03

6.54

8.05

9.56

11.1

12.6

14.1

15.6

17.1

0.75

2.01

3.27

4.53

5.79

7.05

8.31

9.57

10.8

12.1

13.4

14.6

1

2.01

3.02

4.03

5.04

6.05

7.06

8.07

9.08

10.1

11.1

12.1

1.25

2.01

2.77

3.53

4.29

5.05

5.81

6.57

7.33

8.09

8.85

9.61

1.5

2.01

2.52

3.03

3.54

4.05

4.56

5.07

5.58

6.09

6.6

7.11

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

(A)Reported as a running annual median, which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.

Table 7c - PART 2

Total Nitrogen WQBEL(A) for New Facilities Discharging into Warm Water Classified Streams

 

 

1E5:Design Flow

   

12

15

20

25

30

40

50

60

70

80

90

 

0

26

32

42

52

62

82

103(B)

123(B)

143(B)

163(B)

183(B)

0.1

25

31

40

50

59

78

98

117(B)

136(B)

155(B)

174(B)

0.2

24

29

38

47

56

74

93

111(B)

129(B)

147(B)

165(B)

0.5

20

25

32

40

47

62

78

93

108

123(B)

138(B)

0.75

17.1

21

27

34

40

52

65

78

90

103(B)

115(B)

1

14.1

17

22

27

32

42

53

63

73

83

93

1.25

11.1

13.4

17.2

21

25

32

40

48

55

63

70

1.5

8.13

9.66

12.2

14.8

17.3

22

28

33

38

43

48

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

2.01

(A)Reported as a running annual median, which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.

(B) Total Nitrogen effluent limitation is capped at 100 mg/l in accordance with division practice. 

For discharges to classified streams, the following annual median total phosphorus WQBELs (Table 7d for Cold Water streams, and Table 7e for Warm Water streams) will apply for new facilities based on the appropriate upstream water quality and the interim nutrient water quality standards in Regulation 31.17. If the WQBEL is shaded in grey, the division will automatically apply the technology-based effluent limitations in Table 7a. Regulation 31 Total Phosphorus limits will not apply to discharges to unclassified streams.

Table 7d - PART 1

Total Phosphorus WQBEL(A) for New Facilities Discharging into Cold Water Classified Streams

 

 

1E5:Design Flow

   

0

1

2

3

4

5

6

7

8

9

10

 

0

0.11

0.22

0.33

0.44

0.55

0.66

0.77

0.88

0.99

1.1

1.21

0.01

0.11

0.21

0.31

0.41

0.51

0.61

0.71

0.81

0.91

1.01

1.11

0.02

0.11

0.2

0.29

0.38

0.47

0.56

0.65

0.74

0.83

0.92

1.01

0.05

0.11

0.17

0.23

0.29

0.35

0.41

0.47

0.53

0.59

0.65

0.71

0.08

0.11

0.14

0.17

0.2

0.23

0.26

0.29

0.32

0.35

0.38

0.41

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

(A) Reported as a running annual median, (in mg/l) which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.

Table 7d - PART 2

Total Phosphorus WQBEL(A) for New Facilities Discharging into Cold Water Classified Streams

 

 

1E5:Design Flow

   

12

15

18

20

30

40

50

60

70

80

90

 

0

1.4

1.8

2.1

2.3

3.4

4.5

5.6

6.7

7.8

8.9

10.0

0.01

1.3

1.6

1.9

2.1

3.1

4.1

5.1

6.1

7.1

8.1

9.1

0.02

1.2

1.5

1.7

1.9

2.8

3.7

4.6

5.5

6.4

7.3

8.2

0.05

0.8

1.0

1.2

1.3

1.9

2.5

3.1

3.7

4.3

4.9

5.5

0.08

0.47

0.56

0.65

0.71

1.01

1.3

1.6

1.9

2.2

2.5

2.8

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

0.11

(A) Reported as a running annual median, (in mg/l) which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.

 

 

Table 7e - PART 1

Total Phosphorus WQBEL(A) for New Facilities Discharging into Warm Water Classified

Streams

 

 

1E5:Design Flow

   

0

1

2

3

4

5

6

7

8

9

10

 

0

0.17

0.34

0.51

0.68

0.9

1.0

1.2

1.4

1.5

1.7

1.9

0.01

0.17

0.33

0.49

0.65

0.81

1.0

1.1

1.3

1.5

1.61

1.8

0.02

0.17

0.32

0.47

0.62

0.77

0.9

1.1

1.2

1.4

1.52

1.7

0.05

0.17

0.29

0.41

0.53

0.65

0.77

0.89

1.0

1.1

1.25

1.4

0.1

0.17

0.24

0.31

0.38

0.45

0.52

0.59

0.66

0.73

0.80

0.87

0.13

0.17

0.21

0.25

0.29

0.33

0.37

0.41

0.45

0.49

0.53

0.57

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

(A) Reported as a running annual median (in mg/l), which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.

Table 7e - PART 2

Total Phosphorus WQBEL (A) for New Facilities Discharging into Warm Water Classified

Streams

 

 

1E5:Design Flow

   

12

15

18

20

30

40

50

60

70

80

90

 

0

2.2

2.7

3.2

3.6

5.3

7.0

8.7

10

12

14(B)

15(B)

0.01

2.1

2.6

3.1

3.4

5.0

6.6

8.2

10

11

13(B)

15(B)

0.02

2.0

2.4

2.9

3.2

4.7

6.2

7.7

9.2

11

12

14(B)

0.05

1.6

2.0

2.3

2.6

3.8

5.0

6.2

7.4

8.6

10

11

0.1

1.0

1.2

1.4

1.6

2.3

3.0

3.7

4.4

5.1

5.8

6.5

0.13

0.65

0.77

0.89

1.0

1.4

1.8

2.2

2.6

3.0

3.4

3.8

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

0.17

  • (A) Reported as a running annual median (in mg/l), which is a median of all samples collected in the most recent 12 calendar months including samples collected in accordance with Regulation 85.
  • (B) Total Phosphorus effluent limitation is capped at 12 mg/l in accordance with division practice. See the fact sheet for more information.

5. EPA Periodic Pollutant Monitoring

POTWs may require periodic pollutant scans of the parameters in Table 8. Therefore, the division may include these sampling requirements which shall commence within thirty (30) days of the effective date of this permit and continue at an annual frequency.  

 

 

Table 8

 
 

EPA Recommended Periodic Pollutant Monitoring 

 

ICIS

Code

Effluent Parameter

Effluent Limitations

Maximum Concentrations, Daily Max

Frequency

Sample Type

01002

Total Arsenic, µg/l

Report

Annual

Composite

01027

Total Cadmium, µg/l

Report

Annual

Composite

01034

Total Chromium, µg/l

Report

Annual

Composite

01042

Total Copper, µg/l

Report

Annual

Composite

01051

Total Lead, µg/l

Report

Annual

Composite

71900

Total Mercury, µg/l

Report

Annual

Composite

01062

Total Molybdenum, µg/l

Report

Annual

Composite

01067

Total Nickel, µg/l

Report

Annual

Composite

01147

Total Selenium, µg/l

Report

Annual

Composite

01077

Total Silver, µg/l

Report

Annual

Composite

01092

Total Zinc, µg/l

Report

Annual

Composite

00720

Total Cyanide, µg/l

Report

Annual

Grab

03604

Total Phenols, µg/l

Report

Annual

Composite

6. PFAS Monitoring 

A one-time monitoring requirement for PFAS will be included in the certification to gather information on the presence of this substance in the effluent discharge.  

Please note that due to reporting system limitations, the frequency listed in the certification will be “annual”, however for each year the facility does not sample for PFAS parameters, the permittee should enter “Code 9 - Conditional Monitoring – Not Required this Period” into NetDMR for these parameters. Leaving these parameters blank in NetDMR will trigger a non-compliance violation.

See section I.E.5.f below for guidance of PFAS sampling requirements. 

7. Influent Parameters

   

Regardless of whether or not an effluent discharge occurs and in order to obtain an indication of the current influent loading as compared to the approved capacity specified in the certification and in Part I.B; the permittee shall at least monitor the following influent parameters at the required frequencies, as identified in the certification of this permit, the results to be reported on the Discharge Monitoring Report (See Part I.E).  

If the permittee monitors any parameter more frequently than required by the permit, using an approved test procedure or as specified in this permit, the result of this monitoring shall be included in the calculation and reporting of data to the Division.Such increased frequency shall also be indicated.

Self-monitoring samples taken in compliance with the monitoring requirements specified below shall be taken at Monitoring point 300I (or its equivalent as noted in the certification), at a representative point prior to any biological treatment.

 

Table 9a

 
 

Mechanical Plants With Design Flows Of Less Than Or Equal To 0.25 MGD

 

ICIS

Code

Parameter

Discharge Limitations Maximum Concentrations

Monitoring Frequency

1

Sample Type

30-Day Avg.

7-Day Avg.

Daily Max.

50050G

Flow, MGD                               

Report

 

Report

Continuous2

Recorder2

00180P

Plant Capacity (% of Hydraulic   Capacity)3

Report

   

Monthly

Calculated3

80082G

CBOD5, mg/l4

Report

Report

 

Monthly

Composite5

00310G

BOD5, mg/l

Report

Report

 

Monthly

Composite5

00310G

BOD5, lbs/day

Report

Report

 

Monthly

Calculated

00180Q

Plant Capacity (% of Organic Capacity)3

Report

   

Monthly

Calculated3

00530G

Total Suspended Solids, mg/l

Report

Report

 

Monthly

Composite5

00978

Total Recoverable Arsenic6

Report

   

Monthly

Composite

 

Table 9b

 

Mechanical Plants With Design Flows Of Greater Than 0.25 MGD and Less Than 1 MGD

ICIS

Code

Parameter

Discharge Limitations Maximum Concentrations

Monitoring Frequency1

Sample Type

30-Day Avg.

7-Day Avg.

Daily Max.

50050G

Flow, MGD                 

Report

 

Report

Continuous2

Recorder2

00180P

Plant Capacity (% of Hydraulic Capacity)3

Report

   

Monthly

Calculated3

80082G

CBOD5, mg/l4

Report

Report

 

Weekly

Composite5

00310G

BOD5, mg/l

Report

Report

 

Weekly

Composite5

00310G

BOD5, lbs/day

Report

Report

 

Weekly

Calculated

00180Q

Plant Capacity (% of Organic Capacity)3

Report

   

Monthly

Calculated3

00530G

Total Suspended Solids, mg/l

Report

Report

 

Weekly

Composite5

00978G

Total Recoverable Arsenic6

Report

   

Monthly

Composite

  • 1 Monitoring frequency reductions may be granted, in accordance with the Baseline Monitoring Frequency, Sample Type, and Reduced Monitoring Frequency Policy for Industrial and Domestic Wastewater Treatment Facilities (WQP-20).

  

  • 2 The monitoring frequency and sample type for effluent flow is specified in the certification and is fully enforceable under this permit.  Mechanical type treatment facilities are typically required to have both influent and effluent flow measuring and recording devices. This requirement may be waived in cases where the division determines that either influent or effluent flow measurements are impractical. For these facilities, flow measuring and sampling type will be specified in the certification. If only one device is applicable, then that device will be used to report both influent and effluent flow.  However, where these devices are not in place at the time of certification, the permittee has one year from the end of the calendar month that certification was given to install the required equipment.  Where such equipment is in place, the frequency and type of flow monitoring will be "Continuous" and "Recorder", respectively.  Where such equipment is not in place, the frequency and type of flow monitoring, during the interim period, will be specified in the certification.  For certain facilities, the use of a metered pumping rate or potable water use or may be allowed.  In these cases, the monitoring frequency and sample type will be determined and specified in the certification.
  • 3 The % capacity is to be reported against the listed capacities for the design capacity and for the organic capacities as noted in the most recent Site Approval and as listed in the certification. The percentage should be calculated using the 30-day average values divided by the corresponding capacity, times 100.
  • 4 Monitoring for CBOD5 will be added in addition to BOD5 on the influent sampling requirements when CBOD is used as a limitation on the effluent instead of BOD.  This is needed to determine the percent removal of CBOD where applicable.  BOD monitoring is still necessary to determine the organic loading in terms of percent capacity when Site Approvals are developed on BOD.
  • 5 See the definition of “composite” in Part I.D of this permit. If the division determines that a flow-weighted composite sample is impracticable for a facility, a time composite sample of four equal aliquots collected at two-hour intervals or sampling equal aliquots will be allowed. The monitoring frequency and sample type will be specified in the certification. See Section VI.A of the fact sheet for more information.
  • 6 Total Recoverable Arsenic will be added to influent monitoring if a special study is required. Frequency of monitoring may be modified to match effluent sampling if more frequent.

Table 9c

Lagoon or other Non-Mechanical Facilities With Design Flows Of Less Than Or Equal To 0.5 MGD

ICIS

Code

Parameter

Discharge Limitations Maximum Concentrations

Monitoring Frequency1

Sample Type

30-Day

Average

7-Day Avg.

Daily Max.

50050G

Flow, MGD                               

Report

 

Report

Continuous2

Recorder2

00180P

Plant Capacity (% of Hydraulic Capacity)3

Report

   

Monthly

Calculated3

80082G

CBOD5, mg/l4

Report 

Report 

 

Monthly

Composite5

00310G

BOD5, mg/l

Report

Report

 

Monthly

Composite5

00310G

BOD5, lbs/day

Report

Report

 

Monthly

Calculated

00180Q

Plant Capacity (% of Organic Capacity)

Report

   

Monthly

Calculated3

00978G

Total Recoverable Arsenic6

Report

   

Monthly

Composite

Table 9d

Lagoon or other Non-Mechanical Facilities With Design Greater Than 0.5 MGD and Less Than 1 MGD

ICIS

Code

Parameter

Discharge Limitations Maximum Concentrations

Monitoring Frequency1

Sample Type

30-Day Avg.

7-Day Avg.

Daily Max.

50050G

Flow, MGD                 

Report

 

Report

Continuous2

Recorder2

00180P

Plant Capacity (% of Hydraulic Capacity)3

Report

   

Monthly

Calculated3,5

80082G

CBOD5, mg/l4

Report

Report

 

Weekly

Composite5

00310G

BOD5, mg/l

Report

Report

 

Weekly

Composite5

00310G

BOD5, lbs/day

Report

Report

 

Weekly

Calculated5

00180Q

Plant Capacity (% of Organic Capacity)

Report

   

Monthly

Calculated3,5

00978G

Total Recoverable Arsenic6

Report

   

Monthly

Composite

  • 1 Monitoring frequency reductions may be granted, in accordance with the Baseline Monitoring Frequency, Sample Type, and Reduced Monitoring Frequency Policy for Industrial and Domestic Wastewater Treatment Facilities (WQP-20). 
  • 2 The monitoring frequency and sample type for effluent flow is specified in the certification and is fully enforceable under this permit.  Lagoon type and OWTS treatment facilities are typically required to have both influent and effluent flow measuring and recording devices.  This requirement may be waived in cases where the division determines that either influent or effluent flow measurements are impractical. For these facilities, flow measuring and sampling type will be specified in the certification. If only one device is applicable, then that device will be used to report both influent and effluent flow.   However, where these devices are not in place at the time of certification, the permittee has one year from the end of the calendar month that certification was given to install the required equipment.  Where such equipment is in place, the frequency and type of flow monitoring will be "Continuous" and "Recorder", respectively.  Where such equipment is not in place, the frequency and type of flow monitoring, during the interim period, will be specified in the certification.  For certain facilities, the use of a metered pumping rate or potable water use or may be allowed.  In these cases, the monitoring frequency and sample type will be determined and specified in the certification.
  • 3 The % capacity is to be reported against the listed capacities for the design capacity and for the organic capacities as noted in the most recent Site Approval and as listed in the certification. The percentage should be calculated using the 30-day average values divided by the corresponding capacity, times 100.
  • 4 Monitoring for CBOD5 will be added in addition to BOD5 on the influent sampling requirements when CBOD is used as a limitation on the effluent instead of BOD.  This is needed to determine the percent removal of CBOD where applicable.  BOD monitoring is still necessary to determine the organic loading in terms of percent capacity when Site Approvals are developed on BOD.  
  • 5 See the definition of “composite” in Part I.D of this permit. If the division determines that a flow-weighted composite sample is impracticable for a facility, a time composite sample of four equal aliquots collected at two-hour intervals or sampling equal aliquots will be allowed. The monitoring frequency and sample type will be specified in the certification. If the division determines that a representative sample of influent flow is impractical (e.g. septic tank at individual buildings), the influent sample may be collected after an initial septic/primary settling tank that does not receive recycle flow. In that case, the results would be adjusted for reporting based on the following procedure: The influent concentration reported on Discharge Monitoring Reports (DMRs) shall be calculated as the sample result divided by 0.7 for BOD and 0.4 for TSS. Monitoring of influent loading and concentration for secondary treatment parameters, BOD and TSS, is specified in the certification.
  • 6 Total Recoverable Arsenic will be added to influent monitoring if a special study is required. Frequency of monitoring may be modified to match effluent sampling if more frequent.

 

C.   TERMS AND CONDITIONS

1. Service Area

All wastewater flows contributed in the service area may be accepted by the WWTFs under this permit for treatment at the permittee's wastewater treatment plant provided that such acceptance does not cause or contribute to an exceedance of the throughput or design capacity of the treatment works or the effluent limitations in Part I.B, or constitute a substantial impact to the functioning of the treatment works, degrade the quality of the receiving waters, or harm human health, or the environment.

In addition, the permittee shall enter into and maintain service agreements with any municipalities that discharge into the wastewater treatment facility.  The service agreements shall contain all provisions necessary to protect the financial, physical, and operational integrity of the wastewater treatment works.

2. Design Capacity

The design capacities of the WWTFs under this permit will be based on the levels shown in the respective Site Approvals for these WWTFs.  The hydraulic design capacity of these domestic wastewater treatment works will be shown in units of million gallons per day (MGD) based on a 30day average flow, and organic loading in units of lbs. BOD5 per day based on a 30-day average load.

3. Expansion Requirements

Pursuant to Colorado Law, C.R.S. 25-8-501 (5 d & e), the permittee is required to initiate engineering and financial planning for expansion of the domestic wastewater treatment works whenever throughput reaches eighty (80) percent of the treatment capacity.  Such planning may be deemed unnecessary upon a showing that the area served by the domestic wastewater treatment works has a stable or declining population; but this provision shall not be construed as preventing periodic review by the Division should it be felt that growth is occurring or will occur in the area.

The permittee shall commence construction of such domestic wastewater treatment works expansion whenever throughput reaches ninety-five (95) percent of the treatment capacity or, in the case of a municipality, either commence construction or cease issuance of building permits within such municipality until such construction is commenced; except that building permits may continue to be issued for any construction which would not have the effect of increasing the input of wastewater to the sewage treatment works of the municipality involved.  

Where unusual circumstances result in throughput exceeding 80% of treatment capacity, the permittee may, in lieu of initiating planning for expansion, submit a report to the Division that demonstrates that it is unlikely that the event will reoccur, or even if it were to reoccur, that 95% of the treatment capacity would not be exceeded.

Where unusual circumstances result in throughput exceeding 95% of the treatment capacity, the permittee may, in lieu of initiating construction of the expansion, submit a report to the Division that demonstrates that the domestic wastewater treatment works was in compliance at all times during the events and that it is extremely unlikely that the event will reoccur.

Where the permittee submits a report pursuant to unusual circumstances, and the Division, upon review of such report, determines in writing to the permittee that the report does not support the required findings, the permittee shall initiate planning and/or construction of the domestic wastewater treatment works as appropriate.

4. Facilities Operation and Maintenance

The permittee shall at all times properly operate and maintain all facilities and systems of treatment and control including all portions of the collection system and lift stations owned by the permittee (and related appurtenances) which are installed or used by the permittee as necessary to achieve compliance with the conditions of this permit.  Proper operation and maintenance also includes effective performance, and adequate laboratory and process controls, including appropriate quality assurance procedures.  This provision requires the operation of back-up or auxiliary facilities or similar systems when installed by the permittee only when necessary to achieve compliance with the conditions of the permit.  

Any sludge produced at the wastewater treatment facility shall be disposed of in accordance with State and Federal regulations. The permittee shall take all reasonable steps to minimize or prevent any discharge of sludge use or disposal in violation of this permit which has a reasonable likelihood of adversely affecting human health or the environment.  As necessary, accelerated or additional monitoring to determine the nature and impact of the noncomplying discharge is required. 

5. Best Management Practices

  1. If the domestic wastewater treatment facility consists of an on-site wastewater treatment system (OWTS), (e.g., septic system), the permittee shall employ best management practices (BMPs) to effectively manage the onsite treatment system and to minimize the potential risk of any unintentional release of pollutants. Best management practices shall include, but are not limited to the following:
  1. Properly operate and manage the wastewater treatment system at no greater than its maximum treatment capacity. Keep a logbook to demonstrate the average and maximum daily flows for each month of operation.
  2. Inspect the scum level and sludge level in each septic tank (as applicable) in order to know when the particular septic tank needs to be pumped. Have the septic tank pumped by a licensed pumping contractor. 
  • Conduct routine inspections of all facilities and systems of treatment and control. Maintain a log book on inspection results and a description of any repairs made.
  1. Make every effort to prevent hazardous waste, toxic waste, and/or recreational vehicle (RV) septage from entering any on-site wastewater treatment system (OWTS), as applicable.
  1. Where a Division approved Operation and Maintenance (O&M) Plan is required as a condition of the Site Application Approval, the Permittee shall operate and maintain the wastewater treatment plant in accordance with the approved O&M plan.

 The certification for discharge may include a special report schedule or other permit requirement.

6. Change In Conditions

Any change to the domestic wastewater treatment plant, or to the wastewater it receives, which results in an inability to meet any condition identified in the "Certification Requirements" at Part I.A.3., above, must be reported to the Division within ten (10) working days of the date the permittee becomes aware of such change.  The Division will require the permittee to apply for and obtain an individual permit if it determines that the domestic wastewater treatment plant no longer qualifies for authorization to discharge under the general permit.

7. Lagoon Liner Integrity

For those facilities that use a lagoon as treatment for meeting the permit limitations, the Division will require proof that the lagoon linear meets the allowable seepage rate of 1 * 10 -6 cm/sec.  The certification for discharge may include a compliance schedule or other permit requirement to show that the liner is in place and is functioning appropriately.  

8. Acute WET Testing

a. General Acute WET Testing and Reporting Requirements

The permittee shall conduct an acute 48-hour WET test using Ceriodaphnia dubia and an acute 96-hour WET test using Pimephales promelas.  Acute tests shall be conducted as a static replacement test using a single effluent grab sample.  The permittee shall conduct each acute WET test in accordance with the 40 CFR Part 136 methods described in Methods for Measuring the

Acute Toxicity of Effluents and Receiving Water to Freshwater and Marine Organisms, Fifth Edition, October 2002 (EPA-821-R-02-012) or its most current edition.  The following specifications may be added to the acute WET method in the certification:

Use of the 0.01 alpha level – The permittee may request use of the 0.01 alpha level, and if specified in the certification, this alpha level shall be used for every WET test under the certification.  In this case, the permittee is responsible for determining whether an increase in replicates within each individual test is needed to assure that the test meets the minimum sensitivity requirements.  Chapter 2 of the Method Guidance and Recommendations for Whole Effluent Toxicity (WET) Testing, EPA 821-B-00-004, USEPA, July 2000, must be used to calculate and determine if the minimum significant difference (MSD) requirement has been met.  If this requirement is not met, the test is considered invalid and retesting must be performed during the monitoring period.  The permittee will be required to submit documentation showing that the appropriate number of replicates was used and that the proper MSD criterion has been met, with the WET information summary that is submitted to the Division with the WET test results.  

Use of a CO2 atmosphere to control pH drift – The use of a CO2 atmosphere may be allowed, if specified in the certification, to control ammonia toxicity due to pH drift.  The proper methodology as outlined in the Chronic Method must be followed and documented during the test.  The permittee will be required to submit documentation showing that the proper methodology was used in the testing with the WET information summary that is submitted to the Division with the WET test results.  

The following minimum dilution series should be used: 0% effluent (control), 20%, 40%, 60%, 80%, and 100% effluent.  If the permittee uses more dilutions than prescribed, and accelerated testing is to be performed, the same dilution series shall be used in the accelerated testing as was used in the failed test.

Tests shall be done at the frequency listed in the certification.  Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end of the reporting period when the sample was taken. (i.e., WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, etc.)  The permittee shall submit all laboratory statistical summary sheets, summaries of the determination of a valid, invalid or inconclusive test, and copies of the chain of custody forms, along with the DMR for the reporting period.  

If a test is considered invalid, the permittee is required to perform additional testing during the monitoring period to obtain a valid test result.  Failure to obtain a valid test result during the monitoring period shall result in a violation of the permit for failure to monitor.

  1. Violations of the Permit Limit and Division Notification

An acute WET test is failed whenever the LC50, which represents an estimate of the effluent concentration which is lethal to 50% of the test organisms in the time period prescribed by the test, is found to be less than or equal to 100% effluent.  The permittee must provide written notification of the failure of a WET test to the Division, along with a statement as to whether

accelerated testing or a Toxicity Identification Evaluation (TIE) is being performed, unless otherwise exempted, in writing, by the Division.  Notification must be received by the Division within 14 calendar days of the permittee receiving notice of the WET testing results.  

  1. Automatic Compliance Response

The permittee is responsible for implementing the automatic compliance response provisions of this permit when one of the following occurs:

  • there is a violation of the permit limit (the LC50 endpoint is less than the applicable IWC)
  • during a report-only period, when the LC50 endpoint is less than the applicable IWC
  • the permittee is otherwise informed by the Division that a compliance response is necessary

When one of the above listed events occurs, the following automatic compliance response shall apply.  The permittee shall either: 

  • conduct accelerated testing using the single species found to be more sensitive
  • conduct a Toxicity Identification Evaluation / Toxicity Reduction Evaluation (TIE/TRE) investigation as described below.
  1. Accelerated Testing

If accelerated testing is being performed, testing will be at least once every two weeks for up to five tests, at the appropriate IWC, with only one test being run at a time.   Accelerated testing shall continue until; 1) two consecutive tests fail or three of five tests fail, in which case a pattern of toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found.  Note that the same dilution series should be used in the accelerated testing as was used in the initial test(s) that result in the accelerated testing requirement. 

If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume.  If a pattern of toxicity is found, a TIE/TRE investigation is to be performed.  If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach.  The permittee shall provide written notification of the results within 14 calendar days of completion of the Pattern of Toxicity/No Toxicity demonstration.  

  1. Toxicity Identification Evaluation / Toxicity Reduction Evaluation (TIE/TRE)

 

If a TIE/TRE is being performed, the results of the investigation are to be received by the Division within 180 calendar days of the demonstration of acute WET in the routine test, as defined above, or if accelerated testing was performed, the date the pattern of toxicity is demonstrated.  A status report is to be provided to the Division at the 60 and 120 calendar day points of the TIE/TRE investigation.  The Division may extend the time frame for investigation where reasonable justification exists.  A request for an extension must be made in writing and received prior to the 180 calendar day deadline.  Such request must include a justification and supporting data for such an extension.  

Under a TIE, the permittee may use the time for investigation to conduct a preliminary TIE

(PTIE) or move directly into the TIE.  A PTIE consists of a brief search for possible sources of WET, where a specific parameter(s) is reasonably suspected to have caused such toxicity, and could be identified more simply and cost effectively than a formal TIE.  If the PTIE allows resolution of the WET incident, the TIE need not necessarily be conducted in its entirety.  If, however, WET is not identified or resolved during the PTIE, the TIE must be conducted within the allowed 180 calendar day time frame. 

The Division recommends that the EPA guidance documents regarding TIEs be followed.  If another method is to be used, this procedure should be submitted to the Division prior to initiating the TIE.  

If the pollutant(s) causing toxicity is/are identified, and is/are controlled by a permit effluent limitation(s), this permit may be modified upon request to adjust permit requirements regarding the automatic compliance response. 

If the pollutant(s) causing toxicity is/are identified, and is/are not controlled by a permit effluent limitation(s), the Division may develop limitations the parameter(s), and the permit may be reopened to include these limitations.  

If the pollutant causing toxicity is not able to be identified, or is unable to be specifically identified, or is not able to be controlled by an effluent limit, the permittee will be required to perform either item 1 or item 2 below. 

  • 1) Conduct an investigation which demonstrates actual instream aquatic life conditions upstream and downstream of the discharge, or identify, for Division approval, and conduct an alternative investigation which demonstrates the actual instream impact.  This should include WET testing and chemical analyses of the ambient water.  Depending on the results of the study, the permittee may also be required to identify the control program necessary to eliminate the toxicity and its cost.  Data collected may be presented to the WQCC for consideration at the next appropriate triennial review of the stream standards;
  • 2) Move to a TRE by identifying the necessary control program or activity and proceed with elimination of the toxicity so as to meet the WET effluent limit.  

If toxicity spontaneously disappears in the midst of a TIE, the permittee shall notify the Division within 10 calendar days of such disappearance.  The Division may require the permittee to conduct accelerated testing to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increased frequency of WET testing for some period of time.  If no pattern of toxicity is demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WET testing shall resume.

The control program developed during a TRE consists of the measures determined to be the most feasible to eliminate WET.  This may happen through the identification of the toxicant(s) and then a control program aimed specifically at that toxicant(s) or through the identification of more general toxicant treatability processes. A control program is to be developed and submitted to the Division within 180 calendar days of beginning a TRE.  Status reports on the TRE are to be provided to the Division at the 60 and 120 calendar day points of the TRE investigation.

If toxicity spontaneously disappears in the midst of a TRE, the permittee shall notify the Division within 10 calendar days of such disappearance.  The Division may require the permittee to conduct accelerated testing to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increased frequency for some period of time.  If no pattern of toxicity is demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WET testing shall resume.

d. Toxicity Reopener

This permit may be reopened and modified to include additional or modified numerical permit limitations, new or modified compliance response requirements, changes in the WET testing protocol, the addition of both acute and chronic WET requirements, or any other conditions related to the control of toxicants.

9. Chronic WET Testing

a. General Chronic WET Testing and Reporting Requirements

The permittee shall conduct the chronic WET test using Ceriodaphnia dubia and Pimephales promelas, as a static renewal 7-day test using three separate composite or grab samples, as specified in the certification.  The permittee shall conduct each chronic WET test in accordance with the 40 CFR Part 136 methods described in Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Water to Freshwater Organisms, Fourth Edition, October 2002 (EPA-821-R-02-013) or the most current edition. The following specifications may be added to the chronic WET method: 

Use of the 0.01 alpha level – The permittee has requested use of the 0.01 alpha level, and therefore this alpha level shall be used for every WET test under this permit.  The permittee is responsible for determining whether an increase in replicates within each individual test is needed to assure that the test meets the minimum sensitivity requirements.  Chapter 2 of the

Method Guidance and Recommendations for Whole Effluent Toxicity (WET) Testing, EPA 821B-00-004, USEPA, July 2000, must be used to calculate and determine if the minimum significant difference (MSD) requirement has been met.  If this requirement is not met, the test is considered invalid and retesting must be performed during the monitoring period.  The permittee will be required to submit documentation showing that the appropriate number of replicates was used and that the proper MSD criterion has been met, with the WET information summary that is submitted to the Division with the WET test results.  

Use of a CO2 atmosphere to control pH drift – The use of a CO2 atmosphere will be allowed to control ammonia toxicity due to pH drift.  The proper methodology as outlined in the Chronic Method must be followed and documented during the test.  The permittee will be required to submit documentation showing that the proper methodology was used in the testing with the WET information summary that is submitted to the Division with the WET test results.  

Ceriodaphnia reproduction percentage - For the chronic Ceriodaphnia dubia test, the termination requirement shall be where 80% or more of the surviving control females having produced their third brood.  If this requirement is not met, the test is considered invalid and retesting must be performed during the monitoring period.  The permittee will be required to submit documentation showing that the appropriate number of the surviving control females have had their third brood with the WET information summary that is submitted to the Division with the WET test results.  

The following minimum dilution series should be used based on the IWC calculated in the certification:  0% effluent (control), IWC/4%, IWC/2%, IWC%, (IWC+100)/2%, and 100% effluent.  If the permittee uses more dilutions than prescribed, and accelerated testing is to be performed, the same dilution series shall be used in the accelerated testing (if applicable) as was initially used in the failed test.

Tests shall be done at the frequency listed in the certification.  Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end of the reporting period when the sample was taken. (i.e., WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, etc.)  The permittee shall submit all laboratory statistical summary sheets, summaries of the determination of a valid, invalid or inconclusive test, and copies of the chain of custody forms, along with the DMR for the reporting period.  

If a test is considered invalid, the permittee is required to perform additional testing during the monitoring period to obtain a valid test result.  Failure to obtain a valid test result during the monitoring period shall result in a violation of the permit for failure to monitor.

  1. Violations of the Permit Limit, Failure of One Test Statistical Endpoint and Division Notification

A chronic WET test is considered a violation of a permit limitation when both the NOEC and the IC25, for the same sub-lethal endpoint are at any effluent concentration less than the IWC. This determination is made independently for each test species. The IWC for each facility covered by this general permit will be outlined in the certification. 

A chronic WET test is considered to have failed one of the two statistical endpoints when either the NOEC or the IC25 are at any effluent concentration less than the IWC.  Simultaneous failure of both the NOEC and IC25 for both sub-lethal endpoints, when tests are performed on identical split samples, constitutes only a single violation of the Daily Maximum Effluent Limitation for Chronic WET specified in the certification. The IWC for each facility covered by this general permit will be outlined in the certification. 

In the event of a permit violation, or during a report only period when both the NOEC and the IC25 are at any effluent concentration less than the IWC, or when two consecutive reporting periods have resulted in failure of one of the two statistical endpoints (regardless of which statistical endpoints are failed), the permittee must provide written notification to the Division.  Such notification should explain whether it was a violation or two consecutive failures of a single endpoint, and must indicate whether accelerated testing or a Toxicity Identification Evaluation or Toxicity Reduction Evaluation (TIE or TRE) is being performed, unless otherwise exempted, in writing, by the Division.  Notification must be received by the Division within 14 calendar days of the permittee receiving notice of the WET testing results.

  1. Automatic Compliance Response

The permittee is responsible for implementing the automatic compliance response provisions of this permit when one of the following occurs:

  • there is a violation of the permit limit (both the NOEC and the IC25 endpoints are less than the applicable IWC)
  • during a report only period when both the NOEC and the IC25 are at any effluent concentration less than the IWC
  • two consecutive monitoring periods have resulted in failure of one of the two statistical endpoints (either the IC25 or the NOEC) , including during a report-only period. This determination is made independently for each test species. 
  • the permittee is otherwise informed by the Division that a compliance response is necessary

When one of the above listed events occurs, the following automatic compliance response shall apply.  The permittee shall either: 

  • conduct accelerated testing using the single species found to be more sensitive
  • conduct a Toxicity Identification Evaluation (TIE) or a Toxicity Reduction Evaluation (TRE) investigation as described below.
  1. Accelerated Testing

If accelerated testing is being performed, testing will be at least once every two weeks for up to five tests with only one test being run at a time, using only the IC25 statistical endpoint to determine if the test passed or failed at the appropriate IWC.   Accelerated testing shall continue until; 1) two consecutive tests fail or three of five tests fail, in which case a pattern of toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found.  Note that the same dilution series should be used in the accelerated testing as was used in the initial test(s) that result in the accelerated testing requirement. 

If accelerated testing is required due to failure of one statistical endpoint in two consecutive monitoring periods, and in both of those failures it was the NOEC endpoint that was failed, then the NOEC shall be the only statistical endpoint used to determined whether the accelerated testing passed or failed at the appropriate IWC.  Note that the same dilution series should be used in the accelerated testing as was used in the initial test(s) that result in the accelerated testing requirement. 

If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume.  If a pattern of toxicity is found, a TIE/TRE investigation is to be performed.  If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach.  The permittee shall provide written notification of the results within 14 calendar days of completion of the Pattern of Toxicity/No Toxicity demonstration.  

  1. Toxicity Identification Evaluation (TIE) or Toxicity Reduction Evaluation (TRE)

If a TIE or a TRE is being performed, the results of the investigation are to be received by the Division within 180 calendar days of the demonstration chronic WET in the routine test, as defined above, or if accelerated testing was performed, the date the pattern of toxicity is demonstrated.  A status report is to be provided to the Division at the 60 and 120 calendar day points of the TIE or TRE investigation.  The Division may extend the time frame for

investigation where reasonable justification exists.  A request for an extension must be made in writing and received prior to the 180 calendar day deadline.  Such request must include a justification and supporting data for such an extension.  

Under a TIE, the permittee may use the time for investigation to conduct a preliminary TIE

(PTIE) or move directly into the TIE.  A PTIE consists of a brief search for possible sources of WET, where a specific parameter(s) is reasonably suspected to have caused such toxicity, and could be identified more simply and cost effectively than a formal TIE.  If the PTIE allows resolution of the WET incident, the TIE need not necessarily be conducted in its entirety.  If, however, WET is not identified or resolved during the PTIE, the TIE must be conducted within the allowed 180 calendar day time frame. 

The Division recommends that the EPA guidance documents regarding TIEs be followed.  If another method is to be used, this procedure should be submitted to the Division prior to initiating the TIE.  

If the pollutant(s) causing toxicity is/are identified, and is/are controlled by a permit effluent limitation(s), this permit may be modified upon request to adjust permit requirements regarding the automatic compliance response. 

If the pollutant(s) causing toxicity is/are identified, and is/are not controlled by a permit effluent limitation(s), the Division may develop limitations the parameter(s), and the permit may be reopened to include these limitations.  

If the pollutant causing toxicity is not able to be identified, or is unable to be specifically identified, or is not able to be controlled by an effluent limit, the permittee will be required to perform either item 1 or item 2 below. 

  • 1) Conduct an investigation which demonstrates actual instream aquatic life conditions upstream and downstream of the discharge, or identify, for Division approval, and conduct an alternative investigation which demonstrates the actual instream impact.  This should include WET testing and chemical analyses of the ambient water.  Depending on the results of the study, the permittee may also be required to identify the control program necessary to eliminate the toxicity and its cost.  Data collected may be presented to the WQCC for consideration at the next appropriate triennial review of the stream standards;
  • 2) Move to a TRE by identifying the necessary control program or activity and proceed with elimination of the toxicity so as to meet the WET effluent limit.  

If toxicity spontaneously disappears in the midst of a TIE, the permittee shall notify the Division within 10 calendar days of such disappearance.  The Division may require the permittee to conduct accelerated testing to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increased frequency of WET testing for some period of time.  If no pattern of toxicity is demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WET testing shall resume.

The control program developed during a TRE consists of the measures determined to be the most feasible to eliminate WET.  This may happen through the identification of the toxicant(s) and then a control program aimed specifically at that toxicant(s) or through the identification of more general toxicant treatability processes. A control program is to be developed and submitted to the Division within 180 calendar days of beginning a TRE.  Status reports on the TRE are to be provided to the Division at the 60 and 120 calendar day points of the TRE investigation.

If toxicity spontaneously disappears in the midst of a TRE, the permittee shall notify the Division within 10 calendar days of such disappearance.  The Division may require the permittee to conduct accelerated testing to demonstrate that no pattern of toxicity exists, or may amend the permit to require an increased frequency for some period of time.  If no pattern of toxicity is demonstrated through the accelerated testing or the increased monitoring frequency, the toxicity incident response will be closed and normal WET testing shall resume.

d. Toxicity Reopener

This permit may be reopened and modified to include additional or modified numerical permit limitations, new or modified compliance response requirements, changes in the WET testing protocol, the addition of both acute and chronic WET requirements, or any other conditions related to the control of toxicants.

10. Compliance Schedule(s)  

Pursuant to Regulations 61.8(3)(n) and 61.9(2)(f), this general permit authorizes the inclusion of compliance schedules in specific certifications when consistent with the Division’s Compliance Schedule Policy CW3 and federal requirements. For instance, a certification for an existing discharger under this general permit may contain a compliance schedule if there is a new water quality based effluent limitation or if a water quality based effluent limitation becomes more stringent. The terms and conditions of the compliance schedule will be modeled after the examples in the fact sheet and will include dates for submitting specific reports or the completion of various activities needed to meet the final permit limitations. Compliance schedules will include enforceable milestones at least once a year. 

Regulation 61.8(3)(n)(i) states that a report shall be submitted to the Division no later than 14 calendar days following each date identified in the schedule of compliance. The 14 days have already been incorporated into the due date. The specific report or action item is due by the date listed in the compliance schedule.

11. Special Studies and Additional Monitoring 

Pursuant to Regulation 61.9(2)(f), this general permit authorizes the inclusion in certifications of additional reporting requirements based on site specific considerations including but not limited to a Salinity Study; Groundwater Protection Study; Infiltration/Inflow study; Onsite-Wastewater Treatment System Annual Report; or Installing Flow Measurement Devices. These requirements will vary depending on site-specific considerations and will be fully enforceable under this permit.

12. Industrial Waste Management

  1. The Permittee has the responsibility to protect the Domestic Wastewater Treatment Works

(DWTW), as defined at section 25.8.103(5) of the Colorado Water Quality Control Act, or the Publicly-Owned Treatment Works (POTW), as defined at 40 CFR section 403.3(q) of the federal pretreatment regulations, from pollutants which would cause pass through or interference, as defined at 40 CFR 403.3(p) and (k), or otherwise be incompatible with operation of the treatment works including interference with the use or disposal of municipal sludge. 

  1. Pretreatment Standards (40 CFR Section 403.5) developed pursuant to Section 307 of the Federal Clean Water Act (the Act) require that the Permittee shall not allow, under any circumstances, the introduction of the following pollutants to the DWTW from any source of non-domestic discharge: 
  1. Pollutants which create a fire or explosion hazard in the DWTW, including, but not limited to, wastestreams with a closed cup flashpoint of less than sixty (60) degrees Centigrade (140 degrees Fahrenheit) using the test methods specified in 40 CFR Section 261.21; 

 ii. Pollutants which will cause corrosive structural damage to the DWTW, but in no case discharges with a pH of lower than 5.0 s.u., unless the treatment facilities are specifically designed to accommodate such discharges; 

  • Solid or viscous pollutants in amounts which will cause obstruction to the flow in the DWTW, or otherwise interfere with the operation of the DWTW; 
  1. Any pollutant, including oxygen demanding pollutants (e.g., BOD), released in a discharge at a flow rate and/or pollutant concentration which will cause Interference with any treatment process at the DWTW; 
  1. Heat in amounts which will inhibit biological activity in the DWTW resulting in Interference, but in no case heat in such quantities that the temperature at the DWTW treatment plant exceeds forty (40) degrees Centigrade (104 degrees Fahrenheit) unless the Approval Authority, upon request of the DWTW, approves alternate temperature limits; 
  1. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause Interference or Pass Through; 
  • Pollutants which result in the presence of toxic gases, vapors, or fumes within the DWTW in a quantity that may cause acute worker health and safety problems; 

 viii. Any trucked or hauled pollutants, except at discharge points designated by the DWTW; and

  1. Any specific pollutant that exceeds a local limitation established by the Permittee in accordance with the requirements of 40 CFR Section 403.5(c) and (d). 
  1. Any other pollutant which may cause Pass Through or Interference.
  1. EPA shall be the Approval Authority and the mailing address for all reporting and notifications to the Approval Authority shall be: USEPA 1595 Wynkoop St. 8ENF-W-NP, Denver, CO 80202-1129.  Should the State be delegated authority to implement and enforce the Pretreatment Program in the future, the Permittee shall be notified of the delegation and the state permitting authority shall become the Approval Authority. 
  1. In addition to the general limitations expressed above, more specific Pretreatment Standards have been and will be promulgated for specific industrial categories under Section 307 of the Act (40 CFR Part 405 et. seq.). 
  1. The Permittee must notify the state permitting authority and the Approval Authority, of any new introductions by new or existing industrial users or any substantial change in pollutants from any industrial user within sixty (60) calendar days following the introduction or change.  Such notice must identify: 
  1. Any new introduction of pollutants into the DWTW from an industrial user which would be subject to Sections 301, 306, or 307 of the Act if it were directly discharging those pollutants; or
  1. Any substantial change in the volume or character of pollutants being introduced into the DWTW by any industrial user; 

 iii. For the purposes of this section, adequate notice shall include information on: 

  • (A) The identity of the industrial user;
  • (B) The nature and concentration of pollutants in the discharge and the average and maximum flow of the discharge to be introduced into the  DWTW; and
  • (C) Any anticipated impact of the change on the quantity or quality of effluent to be discharged from or biosolids or sludge produced at such DWTW. 

 iv. For the purposes of this section, an industrial user shall include: 

  • (A) Any discharger subject to Categorical Pretreatment Standards under Section 307 of the Act and 40 CFR chapter I and subchapter N;
  • (B) Any discharger which has a process wastewater flow of 25,000 gallons or more per day;
  • (C) Any discharger contributing five percent or more of the average dry weather hydraulic or organic capacity of the DWTW treatment plant; 
  • (D) Any discharger who is designated by the Approval Authority as having a reasonable potential for adversely affecting the DWTWs operation or for violating any Pretreatment Standard or requirements; 
  1. At such time as a specific Pretreatment Standard or requirement becomes applicable to an industrial user of the Permittee, the state permitting authority and/or Approval Authority may, as appropriate: 
  1. Amend the Permittee's NPDES discharge permit to require the Permittee to develop and submit an approvable Pretreatment program under a compliance schedule, in accordance with procedures in 40 CFR 403.8(e).  The modification of a POTW's NPDES Permit for the purposes of incorporating a POTW Pretreatment Program approved in accordance with the procedure in §403.11 shall be deemed a minor Permit modification subject to the procedures in 40 CFR 122.63(g); or,; 

 ii. Require the Permittee to specify, by ordinance, order, or other enforceable means, the type of pollutant(s) and the maximum amount which may be discharged to the Permittee's DWTW for treatment.  Such requirement shall be imposed in a manner consistent with the program development requirements of the General Pretreatment Regulations at 40 CFR Part 403; and/or, 

 iii. Require the Permittee to monitor its discharge for any pollutant which may likely be discharged from the Permittee's DWTW, should the industrial user fail to properly pretreat its waste. 

The state permitting authority and the Approval Authority retains, at all times, the right to take legal action against any source of nondomestic discharge, whether directly or indirectly controlled by the Permittee, for violations of a permit, order or similar enforceable mechanism issued by the Permittee, violations of any Pretreatment Standard or requirement, or for failure to discharge at an acceptable level under national standards issued by EPA under 40 CFR, chapter I, subchapter N.  In those cases where a CDPS permit violation has occurred because of the failure of the Permittee to properly develop and enforce Pretreatment Standards and requirements as necessary to protect the DWTW, the state permitting authority and/or Approval Authority shall hold the Permittee and/or industrial user responsible and may take legal action against the Permittee as well as the Industrial user(s) contributing to the permit violation.

D. DEFINITIONS OF TERMS

 

  1. "Acute Toxicity" - The acute toxicity limitation is exceeded if the LC50 is at any effluent concentration less than or equal to the IWC indicated in this permit. 
  1. “Antidegradation limits” – See “Two (2) - Year Rolling Average”.
  1. “Applicable water quality criterion (AWQC)” is the quantitation target level or goal. The AWQC may be one of the following: 

Where an effluent limit has been established, 

                      i.      The AWQC is the effluent limit.

Where an effluent limit has not been established, the AWQC may be

  1. An applicable technology based effluent limit (TBEL); 
  2. Half of a water quality standard;
  • Half of a water quality standard as assessed in the receiving water, or potential WQBEL; or  iv.       Half of a potential antidegradation based effluent limitation, which can be an antidegradation based average concentration or a potential non-impact limit.
  1. "Chronic toxicity", which includes lethality and growth or reproduction, occurs when the NOEC and IC25 are at an effluent concentration less than the IWC indicated in this permit.   
  1. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. For a SBR type treatment system, a composite sample is defined as sampling equal aliquots during the beginning, middle and end of a decant period, for two consecutive periods during a day (if possible).
  1. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures the effluent for the parameter in question, or that provides measurements at specified intervals.  
  1. "Daily Maximum limitation" for all parameters (except temperature, pH, dissolved oxygen, and WET) means the limitation for this parameter shall be applied as an average of all samples collected in one calendar day.  For these parameters the DMR shall include the highest of the daily averages.  For pH and dissolved oxygen, this means an instantaneous maximum (and/or instantaneous minimum) value.  For WET, this means an instantaneous minimum value. The instantaneous value is defined as the analytical result of any individual sample.  For pH and dissolved oxygen, DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar month.  For WET, DMRs shall include the minimum of all instantaneous values within the reporting period. For pH and dissolved oxygen, the value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. For temperature, see Daily Maximum Temperature. For WET violation and failure descriptions, see Part I.B.5.   
  1. “Daily Maximum Temperature (DM)” is defined in the Basic Standards and Methodologies for Surface Water 1002-31,  as the highest two-hour average water temperature recorded during a given 24-hour period.  This will be determined using a rolling 2-hour maximum temperature.  If data is collected every 15 minutes, a 2 hour maximum can be determined on every data point after the initial 2 hours of collection.  Note that the time periods that overlap days (Wednesday night to Thursday morning) do not matter as the reported value on the DMR is the greatest of all the 2-hour averages.

This would continue throughout the course of a calendar day.  The highest of these 2 hour averages over a month would be reported on the DMR as the daily maximum temperature.  At the end/beginning of a month, the collected data should be used for the month that contains the greatest number of minutes in the 2-hour maximum.  

  1. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water

1002-31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM (micron) membrane filter.  Determinations of "dissolved" constituents are made using the filtrate.  This may include some very small (colloidal) suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical solution. 

  1. “Geometric mean” for E. coli bacteria concentrations, the thirty (30) day and seven (7) day averages shall be determined as the geometric mean of all samples collected in a thirty (30) day period and the geometric mean of all samples taken in a seven (7) consecutive day period respectively.  The geometric mean may be calculated using two different methods.  For the methods shown, a, b, c, d, etc. are individual sample results, and n is the total number of samples.

Method 1:

                                               (1/n)

Geometric Mean = (a*b*c*d*...) "*" - means multiply

Method 2:

Geometric Mean = antilog ( [log(a)+log(b)+log(c)+log(d)+...]/n )

Graphical methods, even though they may also employ the use of logarithms, may introduce significant error and may not be used.

In calculating the geometric mean, for those individual sample results that are reported by the analytical laboratory to be "less than" a numeric value, a value of 1 should be used in the calculations.  If all individual analytical results for the month are reported to be less than numeric values, then report "less than" the largest of those numeric values on the monthly DMR.  Otherwise, report the calculated value.

For any individual analytical result of "too numerous to count" (TNTC), that analysis shall be considered to be invalid and another sample shall be promptly collected for analysis.  If another sample cannot be collected within the same sampling period for which the invalid sample was collected (during the same month if monthly sampling is required, during the same week if weekly sampling is required, etc.), then the following procedures apply: 

i. A minimum of two samples shall be collected for coliform analysis within the next sampling period. 

 ii. If the sampling frequency is monthly or less frequent:  For the period with the invalid sample results, leave the spaces on the corresponding DMR for reporting coliform results empty and attach to the DMR a letter noting that a result of TNTC was obtained for that period, and explain why another sample for that period had not been collected. 

If the sampling frequency is more frequent than monthly:  Eliminate the result of TNTC from any further calculations, and use all the other results obtained within that month for reporting purposes.  Attach a letter noting that a result of TNTC was obtained, and list all individual analytical results and corresponding sampling dates for that month. 

  1. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. 
  1. “IC25” or “Inhibition Concentration” is a point estimate of the toxicant concentration that would cause a given percent reduction in a non-lethal biological measurement (e.g. growth or reproduction) calculated from a continuous model (i.e. interpolation method).  IC25 is a point estimate of the toxic concentration that would cause a 25-percent reduction in a non-lethal biological measurement. 
  1. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. 
  1. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 
  1. “LC50” or “Lethal Concentration” is the toxic or effluent concentration that would cause death in 50 percent of the test organisms over a specified period of time.
  1. “Maximum Weekly Average Temperature (MWAT)” is defined in the Basic Standards and

Methodologies for Surface Water 1002-31, as an implementation statistic that is calculated from field monitoring data.  The MWAT is calculated as the largest mathematical mean of multiple, equally spaced, daily temperatures over a seven-day consecutive period, with a minimum of three data points spaced equally through the day.  For lakes and reservoirs, the MWAT is assumed to be equivalent to the maximum WAT from at least three profiles distributed throughout the growing season (generally July-September).  

The MWAT is calculated by averaging all temperature data points collected during a calendar day, and then averaging the daily average temperatures for 7 consecutive days.  This 7 day averaging period is a rolling average, i.e. on the 8th day, the MWAT will be the averages of the daily averages of days 2-8.  The value to be reported on the DMR is the highest of all the rolling 7-day averages throughout the month.   For those days that are at the end/beginning of the month, the data shall be reported for the month that contains 4 of the 7 days.

Day 1:  Average of all temperature data collected during the calendar day.

Day 2:  Average of all temperature data collected during the calendar day.

Day 3:  Average of all temperature data collected during the calendar day.

Day 4:  Average of all temperature data collected during the calendar day.

Day 5:  Average of all temperature data collected during the calendar day.

Day 6:  Average of all temperature data collected during the calendar day.

Day 7:  Average of all temperature data collected during the calendar day.

1st MWAT Calculation as average of previous 7 days Day 8:  Average of all temperature data collected during the calendar day.

2nd MWAT Calculation as average of previous 7 days Day 9:  Average of all temperature data collected during the calendar day.

3rd MWAT Calculation as average of previous 7 days

  1. “Minimum level (ML)” means the lowest concentration of an analyte that can be accurately and precisely quantified using a given method, as determined by the laboratory.
  1. “NOEC” or “No-Observed-Effect-Concentration” is the highest concentration of toxicant to which organisms are exposed in a full life cycle or partial life cycle (short term) test, that causes no observable adverse effects on the test organisms (i.e. the highest concentration of toxicant in which the values for the observed responses are not statistically different from the controls).  This value is used, along with other factors, to determine toxicity limits in permits.
  1. "Potentially dissolved (PD) metals fraction” is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated with nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45-UM (micron) membrane filter.  Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent measured. 
  1. “Practical Quantitation Limit (PQL)” means the minimum concentration of an analyte (substance) that can be measured with a high degree of confidence that the analyte is present at or above that concentration.  The use of PQL in this document may refer to those PQLs shown in Part I.D of this permit or the PQLs of an individual laboratory.
  1. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual discharge occurs.  If the discharge is intermittent, then samples shall be collected during the period that discharge occurs. 
  1. "Recorder" requires the continuous operation of an automatic data retention device for providing required records such as a data logger, a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 
  1. SAR and Adjusted SAR - The equation for calculation of SAR-adj is:

Na

SAR-adj

                Where:                    

                     Na+ = Sodium in the effluent reported in meq/l 

                     Mg++ = Magnesium in the effluent reported in meq/l 

Cax = calcium (in meq/l) in the effluent modified due to the ratio of bicarbonate to calcium 

The values for sodium (Na+), calcium (Ca++), bicarbonate (HCO3-) and magnesium (Mg++) in this equation are expressed in units of milliequivalents per liter (meq/l).  Generally, data for these parameters are reported in terms of mg/l, which must then be converted to calculate the SAR.  The conversions are:

Concentration in mg/l

 

Equivalentweight in mg/meq meq/l =          

Where the equivalent weights are determined based on the atomic weight of the element divided by the ion’s charge: 

Na+ = 23.0 mg/meq (atomic weight of 23, charge of 1)

Ca++ = 20.0 mg/meq (atomic weight of 40.078, charge of 2)

Mg++ = 12.15 mg/meq (atomic weight of 24.3, charge of 2)

HCO3- = 61 mg/mep (atomic weight of 61, charge of 1)

The EC and the HCO3 -/Ca++ ratio in the effluent (calculated by dividing the HCO3 - in meq/l by the Ca++ in meq/l) are used to determine the Cax using the following table. 

Table – Modified Calcium Determination for Adjusted Sodium Adsorption Ratio 

 

HCO3/Ca Ratio And EC 1, 2, 3

 

Salinity of Effluent (EC)(dS/m)

   

0.1

0.2

0.3

0.5

0.7

1.0

1.5

2.0

3.0

4.0

6.0

8.0

Ratio of

HCO3/Ca

.05

.10

.15

.20

.25

.30

.35

13.20

13.61

13.92

14.40

14.79

15.26

15.91

16.43

17.28

17.97

19.07

19.94

8.31

8.57

8.77

9.07

9.31

9.62

10.02

10.35

10.89

11.32

12.01

12.56

6.34

6.54

6.69

6.92

7.11

7.34

7.65

7.90

8.31

8.64

9.17

9.58

5.24

5.40

5.52

5.71

5.87

6.06

6.31

6.52

6.86

7.13

7.57

7.91

4.51

4.65

4.76

4.92

5.06

5.22

5.44

5.62

5.91

6.15

6.52

6.82

4.00

4.12

4.21

4.36

4.48

4.62

4.82

4.98

5.24

5.44

5.77

6.04

3.61

3.72

3.80

3.94

4.04

4.17

4.35

4.49

4.72

4.91

5.21

5.45

 

.40

.45

.50

.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

3.00

3.50

4.00

4.50

5.00

7.00

10.00

20.00

30.00

3.30

3.40

3.48

3.60

3.70

3.82

3.98

4.11

4.32

4.49

4.77

4.98

3.05

3.14

3.22

3.33

3.42

3.53

3.68

3.80

4.00

4.15

4.41

4.61

2.84

2.93

3.00

3.10

3.19

3.29

3.43

3.54

3.72

3.87

4.11

4.30

2.17

2.24

2.29

2.37

2.43

2.51

2.62

2.70

2.84

2.95

3.14

3.28

1.79

1.85

1.89

1.96

2.01

2.09

2.16

2.23

2.35

2.44

2.59

2.71

1.54

1.59

1.63

1.68

1.73

1.78

1.86

1.92

2.02

2.10

2.23

2.33

1.37

1.41

1.44

1.49

1.53

1.58

1.65

1.70

1.79

1.86

1.97

2.07

1.23

1.27

1.30

1.35

1.38

1.43

1.49

1.54

1.62

1.68

1.78

1.86

1.13

1.16

1.19

1.23

1.26

1.31

1.36

1.40

1.48

1.54

1.63

1.70

1.04

1.08

1.10

1.14

1.17

1.21

1.26

1.30

1.37

1.42

1.51

1.58

0.97

1.00

1.02

1.06

1.09

1.12

1.17

1.21

1.27

1.32

1.40

1.47

0.85

0.89

0.91

0.94

0.96

1.00

1.04

1.07

1.13

1.17

1.24

1.30

0.78

0.80

0.82

0.85

0.87

0.90

0.94

0.97

1.02

1.06

1.12

1.17

0.71

0.73

0.75

0.78

0.80

0.82

0.86

0.88

0.93

0.97

1.03

1.07

0.66

0.68

0.69

0.72

0.74

0.76

0.79

0.82

0.86

0.90

0.95

0.99

0.61

0.63

0.65

0.67

0.69

0.71

0.74

0.76

0.80

0.83

0.88

0.93

0.49

0.50

0.52

0.53

0.55

0.57

0.59

0.61

0.64

0.67

0.71

0.74

0.39

0.40

0.41

0.42

0.43

0.45

0.47

0.48

0.51

0.53

0.56

0.58

0.24

0.25

0.26

0.26

0.27

0.28

0.29

0.30

0.32

0.33

0.35

0.37

0.18

0.19

0.20

0.20

0.21

0.21

0.22

0.23

0.24

0.25

0.27

0.28

  • 1 Adapted from Suarez (1981).
  • 2 Assumes a soil source of calcium from lime (CaCO3) or silicates; no precipitation of magnesium, and partial pressure of CO2 near the soil surface (PCO2) is 0.0007 atmospheres.
  • 3 Cax, HCO3, Ca are reported in meq/l; EC is in dS/m (deciSiemens per meter).

Because values will not always be quantified at the exact EC or  HCO3– /Ca++ ratio in the table, the resulting Cax must be determined based on the closest value to the calculated value.  For example, for a calculated EC of 2.45 dS/m, the column for the EC of 2.0 would be used.  However, for a calculated EC of 5.1, the corresponding column for the EC of 6.0 would be used.  Similarly, for a HCO3– /Ca++ ratio of 25.1, the row for the 30 ratio would be used.

The Division acknowledges that some effluents may have electrical conductivity levels that fall outside of this table, and others have bicarbonate to calcium ratios that fall outside this table.  For example, some data reflect HCO3– /Ca++ ratios greater than 30 due to bicarbonate concentrations reported greater than 1000 mg/l versus calcium concentrations generally less than 10 mg/l (i.e., corresponding to HCO3– /Ca++ ratios greater than 100).  Despite these high values exceeding the chart’s boundaries, it is noted that the higher the HCO3– /Ca++ ratio, the greater the SAR-adj.  Thus, using the Cax values corresponding to the final row containing bicarbonate/calcium ratios of 30, the permittee will actually calculate an SAR-adj that is less than the value calculated if additional rows reflecting HCO3– /Ca++ ratios of greater than 100 were added. 

  1. "Seven (7) day average" means, with the exception of fecal coliform or E. coli bacteria (see geometric mean), the arithmetic mean of all samples collected in a seven (7) consecutive day period.  Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as beginning on Sunday and ending on Saturday.  If the calendar week overlaps two months (i.e. the Sunday is in one month and the Saturday in the following month), the seven (7) day average calculated for that calendar week shall be associated with the month that contains the Saturday.  Samples may not be used for more than one (1) reporting period.  (See the “Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.D.5 for guidance on calculating averages and reporting analytical results that are less than the PQL).
  1. “Sufficiently sensitive test procedures”: 
  1. An analytical method is ‘‘sufficiently sensitive’’ when the method detects and accurately and precisely quantifies the amount of the analyte. In other words there is a valid positive result; or
  2. An analytical method is “sufficiently sensitive” when the method accurately and precisely quantifies the result to the AWQC, as demonstrated by the ML is less than or equal to the

AWQC. In other words, the level of precision is adequate to inform decision making; or iii.An analytical method is “sufficiently sensitive” when the method achieves the required level of accuracy and precision, as demonstrated by the ML is less than or equal to the PQL. In other words, the most sensitive method is being used and properly followed.

  1. "Thirty (30) day average" means, except for fecal coliform or E. coli bacteria (see geometric mean), the arithmetic mean of all samples collected during a thirty (30) consecutive-day period, which represents a calendar month.  The permittee shall report the appropriate mean of all self-monitoring sample data collected during the calendar month on the Discharge Monitoring Reports.  Samples shall not be used for more than one (1) reporting period. (See the “Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.D.5 for guidance on calculating averages and reporting analytical results that are less than the PQL).
  1. Toxicity Identification Evaluation (TIE) is a set of site-specific procedures used to identify the specific chemical(s) causing effluent toxicity.
  1. “Total Inorganic Nitrogen (T.I.N.)” is an aggregate parameter determined based on ammonia, nitrate and nitrite concentrations.  To determine T.I.N. concentrations, the facility must monitor for total ammonia and total nitrate plus nitrite (or nitrate and nitrite individually) on the same days.  The calculated T.I.N. concentrations in mg/L shall then be determined as the sum of the analytical results of same-day sampling for total ammonia (as N) in mg/L, and total nitrate plus nitrite (as N) in mg/L (or nitrate as N and nitrite as N individually).  From these calculated T.I.N. concentrations, the daily maximum and thirty (30) day average concentrations for T.I.N. shall be determined in the same manner as set out in the definitions for the daily maximum and thirty (30) day average.  (See the “Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.D.5 for guidance on calculating averages and reporting analytical results that are less than the PQL).
  1. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous digestion (Section 4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in Manual of Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, March 1979, or its equivalent. 
  1. “Total Recoverable Metals” means that portion of a water and suspended sediment sample measured by the total recoverable analytical procedure described in Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, March 1979 or its equivalent. 
  1. Toxicity Reduction Evaluation (TRE) is a site-specific study conducted in a step-wise process to identify the causative agents of effluent toxicity, isolate the source of toxicity, evaluate the effectiveness of toxicity control options, and then confirm the reduction in effluent toxicity after the control measures are put in place.
  1. "Twenty four (24) hour composite" sample is a combination of at least eight (8) sample aliquots of at least 100 milliliters, collected at equally spaced intervals during the operating hours of a facility over a twenty-four (24) hour period.  For volatile pollutants, aliquots must be combined in the laboratory immediately before analysis.  The composite must be flow proportional; either the time interval between each aliquot or the volume of each aliquot must be proportional to either the wastewater

or effluent flow at the time of sampling or the total wastewater or effluent flow since the collection of the previous aliquot.  Aliquots may be collected manually or automatically. 

  1. "Twice Monthly" monitoring frequency means that two samples shall be collected each calendar month on separate weeks with at least one full week between the two sample dates.  Also, there shall be at least one full week between the second sample of a month and the first sample of the following month. 
  1. “Two (2) -Year Rolling Average” (Antidegradation limits)- the average of all monthly average data collected in a two year period.  Reporting of two-year rolling average results should begin in the first DMR due once the reporting requirements has been in place for a two year period. To calculate a two-year rolling average, add the current monthly average to the previous 23 monthly averages and divide the total by 24.  This methodology continues on a rolling basis as long as the two year rolling average reporting and/or effluent limit applies (i.e., in the first reporting period use data from month 1 to month 24, in the second reporting period use data from month 2 to month 25, then month 3 to month 26, etc). Ongoing reporting is required across permit terms when data is available for a two year period.     
  1. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. 
  1. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in 25-8-101 et al.) 

Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et seq., the Colorado Discharge Permit System Regulations, Regulation 61 (5 CCR 1002-61) and other applicable regulations.

E. PERMIT SPECIFIC MONITORING, SAMPLING AND REPORTING REQUIREMENTS

1. Routine Reporting of Data

Reporting of the data gathered in compliance with Part I.B or Part I.C shall be on a monthly basis. Reporting of all data gathered shall comply with the requirements of Part I.E (General Requirements).  

Monitoring results shall be summarized for each calendar month via the division’s NetDMR service unless a waiver is granted in compliance with 40 CFR 127.  If a waiver is granted, monitoring results shall be reported on division approved discharge monitoring report (DMR) forms (EPA form 3320-1). 

Reporting No Discharge:  

If no discharge occurs during the reporting period, a DMR must still be submitted. However, "No Discharge" shall be reported on the paper DMR and if reporting electronically please use the No Data Code (NODI) "C" for No Discharge in NetDMR.

When submitting monitoring results via NetDMR, the Copy of Record shall reflect that the DMR was signed and submitted no later than the 28th day of the month following the reporting period.  If submitting DMRs by mail, which is only allowed if a waiver has been granted, one copy of the DMR form shall be mailed to the division at the address provided below, so that the DMR is received no later than the 28th day of the month following the reporting period.

If mailing, the original signed copy of each DMR shall be submitted to the division at the following address:

Colorado Department of Public Health and Environment

Water Quality Control Division

WQCD-P-B2

4300 Cherry Creek Drive South

Denver, Colorado 80246-1530

The Discharge Monitoring Report paper and electronic forms shall be filled out accurately and completely in accordance with the requirements of this permit and the instructions on the forms; and signed by an authorized person as identified in Part II.K.1.

2. Annual Biosolids Report

State Biosolids Annual Report

The permittee shall provide a biosolids annual report to the Division no later February 19th of each year.  The Self-Monitoring Report shall include the items identified in Regulation 64.17.B.  Reports shall be submitted addressing all such activities that occurred in the previous calendar year. 

Biosolids monitoring results shall be reported using appropriate division-provided forms, currently the Biosolids Annual Report form.  Biosolids Annual Reports required herein, shall be signed and certified in accordance with the Signatory Requirements, Part II.K and submitted as follows:

The original copy of each form, plus copies of all required documentation, shall be submitted to the following address:

BIOSOLIDS PROGRAM

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT,

WATER QUALITY CONTROL DIVISION

WQCD-PERMITS-B2

4300 CHERRY CREEK DRIVE SOUTH

DENVER, COLORADO  80246-1530

EPA Biosolids Annual Report

EPA biosolids reporting is now done electronically.  It is the responsibility of the permittee to check with the EPA on whether or not the EPA requires a biosolids annual report for the facility.

3. Representative Sampling

Samples and measurements taken for the respective identified monitoring points as required herein shall be representative of the volume and nature of: 1) all influent wastes received at the facility, including septage, biosolids, etc.; 2) the monitored effluent discharged from the facility; and 3) biosolids produced at the facility.  All samples shall be taken at the monitoring points specified in this permit and, unless otherwise specified, before the influent, effluent, or biosolids wastestream joins or is diluted by any other wastestream, body of water, or substance.  Monitoring points shall not be changed without notification to and prior approval by the Division.  

4. Influent and Effluent Sampling Points

Influent and effluent sampling points shall be so designed or modified so that: 1) a sample of the influent can be obtained after preliminary treatment and prior to primary or biological treatment and 2) a sample of the effluent can be obtained at a point after the final treatment process and prior to discharge to state waters, unless otherwise specified in the certification. Any discharge to the waters of the State from a point source other than specifically authorized by this permit is prohibited. The permittee shall provide access to the Division to sample at these points.  

5. Analytical and Sampling Methods for Monitoring and Reporting

                    The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods.  All sampling shall be performed by the permittee according to specified methods in 40 C.F.R. Part 136; methods approved by EPA pursuant to 40 C.F.R. Part 136; or methods approved by the Division, in the absence of a method specified in or approved pursuant to 40 C.F.R. Part 136.  

The permittee may use an equivalent and acceptable alternative to an EPA-approved method without EPA review where the requirements of 40 CFR Part 136.6 are met and documented. The permittee may use an Alternative Test Procedure (ATP). An ATP is defined as a way in which an analyte is identified and quantified that is reviewed and approved by EPA in accordance with 40 CFR Part 136.4 for nationwide use, or a modification to a 40 CFR 136 approved method that is reviewed and approved by EPA in accordance with 40 CFR Part 136.5 for limited use.

  1. The permittee must select a test procedure that is “sufficiently sensitive” for all monitoring conducted in accordance with this permit.
  1. The PQLs for specific parameters are listed in the table below. PQLs for other parameters may be included in a certification under this general permit. 

  

  1. If the permit contains an interim effluent limitation (a limit is report until such time as a numeric effluent limit becomes effective) for a parameter, the final numeric effluent limit shall be considered the AWQC for the purpose of determining whether a test method is sufficiently sensitive.
  1. When the analytical method which complies with the above requirements has an ML greater than the permit limit, and the permittee’s analytical result is less than the ML, the permittee shall report "BDL" on the DMR. Such reports will not be considered as violations of the permit limit, as long as the method is sufficiently sensitive. For parameters that have a report only limitation, and the permittee’s analytical result is less than the ML, (where X = the ML) “< X” shall be reported on the DMR.
  1. In the calculation of average concentrations (i.e. 7- day, 30-day average, 2-year rolling average) any individual analytical result that is less than the ML shall be considered to be zero for the calculation purposes. When reporting:

If all individual analytical results are less than the ML, the permittee shall report either “BDL” or “<X” (where X = the ML), following the guidance above.

If one or more individual results is greater than the ML, an average shall be calculated and reported. Note that it does not matter if the final calculated average is greater or less than the ML, it must be reported as a value.

Table Practical quantitation limits – Metals, inorganics, nutrients, radiological parameters, and nonylphenol 

 

Parameter

Reporting Units

PQL

Parameter

Reporting Units

PQL

Aluminum 

μg/L¹ 

15 

Ammonia

Nitrogen 

mg/L² N 

0.2 

Antimony 

μg/L 

Nitrate+Nitrite Nitrogen 

mg/L N 

0.1 

Parameter

Reporting Units

PQL

Parameter

Reporting Units

PQL

Arsenic 

μg/L 

Nitrate Nitrogen 

mg/L N 

0.1 

Barium 

μg/L 

Nitrite

Nitrogen 

mg/L N 

0.05 

Beryllium 

μg/L 

Total Kjeldahl Nitrogen 

mg/L N 

0.5 

Boron 

μg/L 

20 

Total Nitrogen 

mg/L N 

0.5 

Cadmium 

μg/L 

0.5 

Total

Inorganic

Nitrogen 

mg/L N 

0.2 

Calcium 

μg/L 

120 

Phosphorus 

mg/L P 

0.053

Chromium 

μg/L 

20 

BOD/CBOD 

mg/L 

Chromium,

Trivalent 

μg/L 

 ---

Chloride 

mg/L 

Chromium, Hexavalent 

μg/L 

203, 4

Total Residual Chlorine, DPD 

mg/L 

0.5 

Copper 

μg/L 

Total Residual

Chlorine,

Amperiometric 

mg/L 

0.05 

Iron 

μg/L 

203

Cyanide 

μg/L 

103

Lead 

μg/L 

0.5 

Fluoride 

mg/L 

0.5 

Magnesium 

μg/L 

35 

Phenols 

μg/L 

30 

Manganese 

μg/L 

Sulfate 

mg/L 

Mercury 

μg/L 

0.23

Sulfide 

mg/L H₂S 

0.1 

Mercury, Low Level 

μg/L 

0.002 

Total

Dissolved

Solids (TDS) 

mg/L 

10 

Molybdenum 

μg/L 

0.5 

Total

Suspended

Solids (TSS) 

mg/L 

Nickel 

μg/L 

Radium-226 

pCi/L 

Selenium 

μg/ L 

13

Radium-228 

pCi/L 

Silver 

μg/ L 

0.5 

Uranium 

μg/ L 

Sodium 

μg/ L 

150 

Nonylphenol, ASTM D7065 

μg/ L 

10 

Thallium 

μg/ L 

0.5 

Zinc 

μg/ L 

10 

1 μg/L = micrograms per liter 

² mg/L = milligrams per liter 

³ PQL established based on parameter specific evaluation

4 For hexavalent chromium, samples must be unacidified so dissolved concentrations will be measured rather than potentially dissolved concentrations.

f. PFAS Analysis - At the time of permit issuance, there is no EPA-approved analytical method for analyzing PFAS in wastewaters (non-potable) that are approved for Clean Water Act monitoring in accordance with 40 CFR Part 136 (Appendix B). The analytical method for the PFAS parameters shall be compliant with the requirements set forth in the Department of Defense (DoD) Quality Systems Manual (QSM) for Environmental Laboratories, currently DoD QSM 5.4. DoD QSM 5.4 in turn requires compliance with EPA Draft Method 1633.

At a minimum, the laboratory selected shall be able to analyze and quantify the PFAS parameters at or below the associated PFAS quantification limits (PFAS QL). If the laboratory selected is capable of achieving a quantification limit for a specific PFAS that is lower than the PFAS QL listed below, analytical results should be reported to the department relative to the lower laboratory quantification limit, and not reported as “less than” the PFAS QL in the table below.

Any 40 CFR Part 136 (Appendix B) approved method for analyzing PFAS in wastewater that becomes available in the future would replace this current analytical method requirement.

6. Flow Measuring Devices

Unless exempted in the permit certification, flow metering at the headworks shall be provided to give representative values of throughput and treatment of the wastewater system.  The metering device shall be equipped with a local flow indication instrument and a flow indication-recording-totalization device suitable for providing permanent flow records, which should be in the plant control building.  

An instantaneous or continuous effluent flow measuring device shall be required in addition to the above described influent flow measuring device. Where influent/effluent flow metering is not practical and the same results may be obtained from metering at the influent/effluent end of the treatment facility or flow metering by some other means, this type of flow metering arrangement will be considered, and if approved, noted in the certification.  In these cases, the monitoring frequency and sample type will be determined and specified in the certification.

At the request of the Division, the permittee must be able to show proof of the accuracy of any flow-measuring device used in obtaining data submitted in the monitoring report.  The flow-measuring device must indicate values within ten (10) percent of the actual flow being measured.

 

PART II

Part II contains standard conditions required by federal regulation to be included in all NPDES permits (see 40 C.F.R. 122.41). Part I contains permit specific requirements.  To the extent that Part I conflicts with the standard terms and conditions of Part II, the requirements of Part I shall control.  

A. DUTY TO COMPLY

 

  1. The permittee must comply with all conditions of this permit. Any permit noncompliance constitutes a violation of the Colorado Water Quality Control Act and is grounds for: 1) enforcement action; 2) permit termination, revocation and reissuance, or modification; or 3) denial of a permit renewal application.
  2. Federal Enforcement:
    1. The permittee shall comply with effluent standards or prohibitions established under section 307(a) of the Clean Water Act for toxic pollutants and with standards for sewage sludge use or disposal (see 40 CFR 122.2) established under section 405(d) of the CWA within the time provided in the regulations that establish these standards or prohibitions or standards for sewage sludge use or disposal, even if the permit has not yet been modified to incorporate the requirement. 
    2. The Clean Water Act provides that any person who violates section 301, 302, 306, 307, 308, 318 or 405 of the Act, or any permit condition or limitation implementing any such sections in a permit issued under section 402, or any requirement imposed in a pretreatment program approved under sections 402(a)(3) or 402(b)(8) of the Act, is subject to a civil penalty not to exceed $25,000 per day for each violation. The Clean Water Act provides that any person who negligently violates sections 301, 302, 306, 307, 308, 318, or 405 of the Act, or any condition or limitation implementing any of such sections in a permit issued under section 402 of the Act, or any requirement imposed in a pretreatment program approved under section 402(a)(3) or 402(b)(8) of the Act, is subject to criminal penalties of $2,500 to $25,000 per day of violation, or imprisonment of not more than 1 year, or both. In the case of a second or subsequent conviction for a negligent violation, a person shall be subject to criminal penalties of not more than $50,000 per day of violation, or by imprisonment of not more than 2 years, or both. Any person who knowingly violates such sections, or such conditions or limitations is subject to criminal penalties of $5,000 to $50,000 per day of violation, or imprisonment for not more than 3 years, or both. In the case of a second or subsequent conviction for a knowing violation, a person shall be subject to criminal penalties of not more than $100,000 per day of violation, or imprisonment of not more than 6 years, or both. Any person who knowingly violates section 301, 302, 303, 306, 307, 308, 318 or 405 of the Act, or any permit condition or limitation implementing any of such sections in a permit issued under section 402 of the Act, and who knows at that time that he thereby places another person in imminent danger of death or serious bodily injury, shall, upon conviction, be subject to a fine of not more than $250,000 or imprisonment of not more than 15 years, or both. In the case of a second or subsequent conviction for a knowing endangerment violation, a person shall be subject to a fine of not more than $500,000 or by imprisonment of not more than 30 years, or both. An organization, as defined in section 309(c)(3)(B)(iii) of the CWA, shall, upon conviction of violating the imminent danger provision, be subject to a fine of not more than $1,000,000 and can be fined up to $2,000,000 for second or subsequent convictions.
    3. Any person may be assessed an administrative penalty by the Administrator for violating section 301, 302, 306, 307, 308, 318 or 405 of this Act, or any permit condition or limitation implementing any of such sections in a permit issued under section 402 of this Act. Administrative penalties for Class I violations are not to exceed $10,000 per violation, with the maximum amount of any Class I penalty assessed not to exceed $25,000. Penalties for Class II violations are not to exceed $10,000 per day for each day during which the violation continues, with the maximum amount of any Class II penalty not to exceed $125,000.

B. DUTY TO REAPPLY

If the permittee plans to continue an activity regulated by this permit after the expiration date of this permit, the permittee must submit a permit application at least 180 days before this permit expires as required by Regulations 61.4 and 61.10.  

C. NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE

It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit. 

D.  DUTY TO MITIGATE

The permittee must take all reasonable steps to minimize or prevent any discharge or sludge use or disposal in violation of this permit which has a reasonable likelihood of adversely affecting human health or the environment. 

E.  PROPER OPERATION AND MAINTENANCE 

 

The permittee must at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances) that are installed or used by the permittee to achieve compliance with the conditions of this permit. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality assurance procedures. This provision requires the operation of backup or auxiliary facilities or similar systems which are installed by a permittee only when the operation is necessary to achieve compliance with the conditions of this permit.  See 40 C.F.R. §122.41(e).  

F. PERMIT ACTIONS 

This permit may be modified, revoked and reissued, or terminated for cause. The filing of a request for a permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not stay any permit condition.  Any request for modification, revocation, reissuance, or termination under this permit must comply with all terms and conditions of Regulation

61.8(8).  See also 40 C.F.R. § 122.41(f).  

G. PROPERTY RIGHTS 

In accordance with 40 CFR §122.41(g) and Regulation 61.8(9):

  1. The issuance of a permit does not convey any property or water rights in either real or personal property, or stream flows or any exclusive privilege.
  2. The issuance of a permit does not authorize any injury to person or property or any invasion of personal rights, nor does it authorize the infringement of federal, state, or local laws or regulations.
  3. Except for any toxic effluent standard or prohibition imposed under Section 307 of the Clean Water Act or any standard for sewage sludge use or disposal under Section 405(d) of the Federal act, compliance with a permit during its term constitutes compliance, for purposes of enforcement, with Sections 301, 302, 306, 318, 403, and 405(a) and (b) of the Clean Water Act. However, a permit may be modified, revoked and reissued, or terminated during its term for cause as set forth in Section

61.8(8) of the Colorado Discharge Permit System Regulations. See 61.8(9)(c).

H. DUTY TO PROVIDE INFORMATION 

The permittee shall furnish to the Division, within a reasonable time, any information which the Division may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this permit, or to determine compliance with this permit. The permittee shall also furnish to the Division, upon request, copies of records required to be kept by this permit in accordance with 40 C.F.R. §122.41(h) and/or Regulation 61.8(3)(q). 

I. INSPECTION AND ENTRY

The permittee shall allow the Division and the authorized representative, including U.S. EPA, and/or their authorized representatives (including an authorized contractor acting as their representative), upon the presentation of credentials as required by law, to conduct inspections in accordance with 40 C.F.R.

  • 122.41(i), Regulation 61.8(3), and Regulation 61.8(4): 
  1. To enter upon the permittee's premises where a regulated facility or activity is located or conducted in which any records are required to be kept under the terms and conditions of this permit;
  2. At reasonable times to have access to and copy any records required to be kept under the terms and conditions of this permit and to inspect any facilities, equipment (including monitoring and control equipment), practices, operations or monitoring method regulated or required in the permit; 
  3. To enter upon the permittee's premises in a reasonable manner and at a reasonable time to inspect or investigate, any actual, suspected, or potential source of water pollution, or to ascertain compliance or noncompliance with the Colorado Water Quality Control Act or any other applicable state or federal statute or regulation or any order promulgated by the Division, and;  
  4. Sample or monitor at reasonable times, for the purposes of assuring permit compliance or as otherwise authorized by the Clean Water Act, any substances or parameters at any location.

J. MONITORING AND RECORDS

  1. Samples and measurements taken for the purpose of monitoring must be representative of the volume and nature of the monitored activity.  See 40 C.F.R. § 122.41(j)(1).
  2. Monitoring must be conducted according to test procedures approved under 40 C.F.R. part 136 for the analyses of pollutants unless another method is required under 40 C.F.R. subchapters N or O. In the case of pollutants for which there are no approved methods under 40 C.F.R. part 136 or otherwise required under 40 C.F.R. subchapters N or O, monitoring must be conducted according to a test procedure specified in this permit for such pollutants.  See 40 C.F.R. § 122.41(j)(4); 122.44(i)(1)(iv)(A).
  3. Except for records of monitoring information required by this permit related to the permittee's sewage sludge use and disposal activities, which shall be retained for a period of at least five years (or longer as required by 40 CFR part 503), the permittee shall retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, copies of all reports required by this permit, and records of all data used to complete the application for this permit, for a period of at least 3 years from the date of the sample, measurement, report or application. This period of retention shall be extended during the course of any unresolved litigation regarding the discharge of pollutants by the permittee or when requested by the Division or Regional Administrator.
  4. Records of monitoring information must include:
    1. The date, exact place, and time of sampling or measurements;
    2. The individual(s) who performed the sampling or measurements;
    3. The date(s) analyses were performed
    4. The individual(s) who performed the analyses;
    5. The analytical techniques or methods used; and
    6. The results of such analyses.
  5. The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including biological and indicated pollutant monitoring methods. See Regulation 61.8(4)(b)(iii).  All sampling shall be performed by the permittee according to sufficiently sensitive test procedures required by 40 C.F.R. 122.44(i)(1)(iv) or methods approved by the Division, in the absence of a method specified in or approved pursuant to 40 C.F.R. Part 136.
  6. The CWA provides that any person who falsifies, tampers with, or knowingly renders inaccurate any monitoring device or method required to be maintained under this permit shall, upon conviction, be punished by a fine of not more than $10,000, or by imprisonment for not more than 2 years, or both. If a conviction of a person is for a violation committed after a first conviction of such person under this paragraph, punishment is a fine of not more than $20,000 per day of violation, or by imprisonment of not more than 4 years, or both.

K.  SIGNATORY REQUIREMENTS

  1. Authorization to Sign:  All documents required to be submitted to the Division by the permittee must be signed in accordance with 40 CFR §122.22, Regulation 61.4, and the following criteria:
    1. For a corporation: By a responsible corporate officer. For the purpose of this subsection, a responsible corporate officer means: (i) a president, treasurer, or vice president of the corporation in charge of a principal business function, or any other person who performs similar policy- or decision-making functions for the corporation, or (ii) the manager of one or more manufacturing, production, or operating facilities, provided, the manager is authorized to make management decisions which govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long term environmental compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures.
    2. For a partnership or sole proprietorship: By a general partner or the proprietor, respectively; or
    3. For a municipality, state, federal, or other public agency: By either a principal executive officer or ranking elected official. For purposes of this subsection, a principal executive officer of a federal agency includes (i) the chief or principal executive officer of the agency, or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency. (e.g., Regional Administrator of EPA). For purposes of this section, a principal executive officer has responsibility for the overall operation of the facility from which the discharge originates.
    4. By a duly authorized representative in accordance with 40 C.F.R. 122.22(b), only if:
      1. the authorization is made in writing by a person described in Part II.K.1.a, b, or c above; 
      2. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and, 
  • The written authorization is submitted to the Division.
  1. Any person(s) signing documents required for submittal to the Division must make the following certification:

“I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.”

  1. The CWA provides that any person who knowingly makes any false statement, representation, or certification in any record or other document submitted or required to be maintained under this permit, including monitoring reports or reports of compliance or non-compliance shall, upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more than 6 months per violation, or by both. See 40 C.F.R. §122.41(k)(2).

L. REPORTING REQUIREMENTS  

  1. Planned Changes:  The permittee shall give advance notice to the Division, in writing, of any planned physical alterations or additions to the permitted facility in accordance with 40 CFR §122.41(l) and Regulation 61.8(5)(a) and Part II.O. of this permit.  Notice is required only when: 
    1. The alteration or addition to a permitted facility may meet one of the criteria for determining whether a facility is a new source in 40 CFR §122.29(b); or
    2. The alteration or addition could significantly change the nature or increase the quantity of pollutants discharged.  This notification applies to pollutants which are subject neither to effluent limitations in the permit, nor to notification requirements under 40 CFR §122.41(a)(1).  
    3. The alteration or addition results in a significant change in the permittee's sludge use or disposal practices, and such alteration, addition, or change may justify the application of permit conditions that are different from or absent in the existing permit, including notification of additional use or disposal sites not reported during the permit application process or not reported pursuant to an approved land application plan.  See 40 C.F.R.
  • 122.41(l)(1)(iii).
  1. Anticipated Non-Compliance:  The permittee shall give advance notice to the Division, in writing, of any planned changes in the permitted facility or activity that may result in noncompliance with permit requirements.  The timing of notification requirements differs based on the type of noncompliance as described below. 
  2. Transfer of Ownership or Control:   The permittee shall notify the Division, in writing, thirty (30) calendar days in advance of a proposed transfer of the permit. This permit is not transferable to any person except after notice to the Division. The Division may require modification or revocation and reissuance of the permit to change the name of the permittee and incorporate such other requirements as may be necessary under the Clean Water Act.  See Regulation 61.8(6); 40 C.F.R. §§ 122.41(l)(iii) and 122.61.
  3. Monitoring reports:  Monitoring results must be reported at the intervals specified in this permit.
    1. If the permittee monitors any pollutant at the approved monitoring locations listed in Part I more frequently than that required by this permit using test procedures approved under 40 CFR Part 136, or another method required for an industry-specific waste stream under 40 CFR subchapters N or O, the results of such monitoring shall be included in the calculation and reporting of the data submitted in the DMR or sludge reporting form specified by the Division. See 40 CFR 122.41(l)(4).
    2. Calculations for all limitations which require averaging of measurements shall utilize an arithmetic mean unless otherwise specified by the Division in the permit.
  4. Submission of Discharge Monitoring Reports (DMRs):  DMRs shall be submitted electronically through NetDMR system unless the permittee requests and is granted a waiver of the electronic reporting requirement by the Division pursuant to Regulation 61.8(4)(d).
  5. Compliance Schedules:  Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule in the permit, shall be submitted on the date listed in the compliance schedule section. The fourteen (14) calendar day provision in Regulation 61.8(4)(n)(i) has been incorporated into the due date.
  6. Twenty-four hour reporting:  
    1. In addition to the reports required elsewhere in this permit, the permittee shall report the following circumstances orally within twenty-four (24) hours from the time the permittee becomes aware of the circumstances, and shall mail to the Division a written report containing the information requested within five (5) working days after becoming aware of the following circumstances:
      1. Circumstances leading to any noncompliance which may endanger health or the environment regardless of the cause of the incident;
      2. Circumstances leading to any unanticipated bypass which exceeds any effluent limitations in the permit;
  • Circumstances leading to any upset which causes an exceedance of any effluent limitation in the permit; or
  1. Daily maximum violations for any of the pollutants limited by Part I.B of this permit as specified in Part III of this permit. This includes any toxic pollutant or hazardous substance or any pollutant specifically identified as the method to control any toxic pollutant or hazardous substance. 
  1. The report shall contain a description of the noncompliance and its cause; the period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance.
  2. For noncompliance events related to combined sewer overflows, sanitary sewer overflows, or bypass events, these reports must include the data described above (with the exception of time of discovery) as well as the type of event (combined sewer overflows, sanitary sewer overflows, or bypass events), type of sewer overflow structure (e.g., manhole, combine sewer overflow outfall), discharge volumes untreated by the treatment works treating domestic sewage, types of human health and environmental impacts of the sewer overflow event, and whether the noncompliance was related to wet weather. See 40 CFR 122.41(l)(6)(i).

i.      As of December 21, 2020 all reports related to combined sewer overflows, sanitary sewer overflows, or bypass events submitted in compliance with this section must be submitted electronically by the permittee to the division.

  1. Other non-compliance:  A permittee must report all instances of noncompliance at the time monitoring reports are due.  These reports may be submitted annually in accordance with Regulation

61.8(4)(p) and/or 61.8(5)(f), but may be submitted at a more frequent interval. 

M. BYPASS

  1. Definitions: 
    1. “Bypass” means the intentional diversion of waste streams from any portion of a treatment facility in accordance with 40 CFR §122.41(m)(1)(i) and/or Regulation 61.2(12).
    2. Severe property damage means substantial physical damage to property, damage to the treatment facilities which causes them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production. See 40 CFR §122.41(m)(1)(ii).
  2. Bypass not exceeding limitations. The permittee may allow any bypass to occur which does not cause effluent limitations to be exceeded, but only if it also is for essential maintenance to assure efficient operation. These bypasses are not subject to the provisions of 40 CFR 122.41(m)(3) and (m)(4). See 40 CFR §122.41(m)(2).
  3. Notice of bypass:  
    1. Anticipated bypass. If the permittee knows in advance of the need for a bypass, the permittee shall submit prior notice, if possible, at least ten (10) days before the date of the bypass.  See 40 CFR §122.41(m)(3)(i) and/or Regulation 61.9(5)(c).
    2. Unanticipated bypass. You must submit notice of an unanticipated bypass as required in Part II.L.7. See also 40 CFR §122.41(m)(3)(ii).
  4. Prohibition of Bypass:  Bypasses are prohibited and the Division may take enforcement action against the permittee for bypass, unless:
    1. the bypass is unavoidable to prevent loss of life, personal injury, or severe property damage;
    2. There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, or maintenance during normal periods of equipment downtime. This condition is not satisfied if adequate backup equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass which occurred during normal periods of equipment downtime or preventive maintenance; and
    3. Proper notices were submitted to the Division. 

i. The Division may approve an anticipated bypass, after considering its adverse effects, if the Division determines that it will meet the three conditions listed.

N. UPSET 

  1. Definition:  “Upset” means an exceptional incident in which there is unintentional and temporary noncompliance with technology based permit effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or careless or improper operation. See 40 CFR §122.41(n) and Regulation 61.2(113).
  2. Effect of an upset:  An upset constitutes an affirmative defense to an action brought for noncompliance with permit effluent limitations if the requirements of section 3 are met. A determination made during administrative review of claims that noncompliance was caused by upset is final administrative action subject to judicial review in accordance with Regulation 61.8(3)(j).  

**special note:** this provision is consistent with the definition of “Upset” as codified in Regulation

61.2(113). However, the Colorado regulatory definition of upset is less stringent than the federal

code of regulations, which restricts the use of an upset defense to noncompliance with technologybased permit effluent limitations only.     

  1. Conditions necessary for demonstration of an Upset:  A permittee who wishes to establish the affirmative defense of upset shall demonstrate through properly signed contemporaneous operating logs, or other relevant evidence that:
    1. an upset occurred and the permittee can identify the cause(s) of the upset;
    2. the permitted facility was at the time being properly maintained; and
    3. the permittee submitted notice of the upset as required in Part II.L.7 (24-hour notice); and
    4. The permittee complied with any remedial measure necessary to minimize or prevent any discharge or sludge use or disposal in violation of this permit which has a reasonable likelihood of adversely affecting human health or the environment. See also 40 C.F.R.

122.41(n)(3)(i)-(iv).  

**special note:** this provision is consistent with the definition of “Conditions necessary for demonstration of upset” as codified in Regulation 61.8(3)(j)(ii). However, the Colorado regulatory definition of upset is less stringent than the federal code of regulations, which restricts the use of an upset defense to demonstrate that a facility was properly operated and maintained.  Colorado’s regulatory definition of “Conditions necessary for demonstration of upset” is less stringent than the requirements of the federal Clean Water Act.

  1. In addition to the demonstration required above, a permittee who wishes to establish the affirmative defense of upset for a violation of effluent limitations based upon water quality standards shall also demonstrate through monitoring, modeling or other methods that the relevant standards were achieved in the receiving water.
  2. Burden of Proof:  In any enforcement proceeding, the permittee seeking to establish the occurrence of an upset has the burden of proof.

O.  REOPENER CLAUSE

Procedures for modification or revocation. Permit modification or revocation of this permit or coverage under this permit will be conducted according to Regulation 61.8(8). This permit may be reopened and modified (following proper administrative procedures) to include the appropriate effluent limitations (and compliance schedule, if necessary), or other appropriate requirements if one of the following events occurs, including but not limited to:

  1. Water Quality Standards: The water quality standards of the receiving water(s) to which the permittee discharges are modified in such a manner as to require different effluent limits than contained in this permit.
  2. Wasteload Allocation: A wasteload allocation is developed and approved by the State of Colorado and/or EPA for incorporation in this permit.
  3. Discharger-specific variance:  A variance is adopted by the Water Quality Control Commission.

P. OTHER INFORMATION

When the permittee becomes aware that it failed to submit any relevant facts in a permit application, or submitted incorrect information in a permit application or in any report to the Division or U.S. EPA, the Discharger shall promptly submit such facts or information.  See 40 C.F.R. § 122.41(l)(8).  

Q. SEVERABILITY

The provisions of this permit are severable. If any provisions or the application of any provision of this permit to any circumstances, is held invalid, the application of such provision to other circumstances and the application of the remainder of this permit shall not be affected.

R. NOTIFICATION REQUIREMENTS

1.    Notification to Parties:  All notification requirements shall be directed as follows: 

  1. Oral Notifications, during normal business hours shall be to:

CDPHE-Emergency Reporting Line: 1-877-518-5608; or

Water Quality Protection Section – Compliance Program 

Water Quality Control Division

Telephone: (303) 692-3500

After hours notifications should be made to the CDPHE-Emergency Reporting Line: 1-877-5185608.

  1. Written notification shall be to:

Water Quality Protection Section – Compliance Program Water Quality Control Division

Colorado Department of Public Health and Environment

WQCD-WQP-B2

4300 Cherry Creek Drive South

Denver, CO 80246-1530

S. RESPONSIBILITIES

Reduction, Loss, or Failure of Treatment Facility:  The permittee has the duty to halt or reduce any activity if necessary to maintain compliance with the effluent limitations of the permit.  It shall not be a defense for a permittee in an enforcement action that it would be necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit.

T. OIL AND HAZARDOUS SUBSTANCE LIABILITY

 

Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to under Section 311 (Oil and Hazardous Substance Liability) of the Clean Water Act. 

U. EMERGENCY POWERS

Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee from any responsibilities, liabilities, or penalties established pursuant to any applicable State law or regulation under authority granted by Section 510 of the Clean Water Act.  Nothing in this permit shall be construed to prevent or limit application of any emergency power of the Division. 

V. CONFIDENTIALITY

Any information relating to any secret process, method of manufacture or production, or sales or marketing data which has been declared confidential by the permittee, and which may be acquired, ascertained, or discovered, whether in any sampling investigation, emergency investigation, Colorado Open Records Act (CORA) request, or otherwise, shall not be publicly disclosed by any member, officer, or employee of the Water Quality Control Commission or the Division, but shall be kept confidential. Any person seeking to invoke the protection of this section shall bear the burden of proving its applicability. This section shall never be interpreted as preventing full disclosure of effluent data.

W. FEES

The permittee is required to submit payment of an annual fee as set forth in the 2016 amendments to the Water Quality Control Act. Section 25-8-502 (1.1) (e), and the Regulation 61.15 as amended. Failure to submit the required fee when due and payable is a violation of the permit and will result in enforcement action pursuant to Section 25-8-601 et. seq., C.R.S.1973 as amended.

X. DURATION OF PERMIT 

The duration of a permit shall be for a fixed term and shall not exceed five (5) years. If the permittee desires to continue to discharge, a permit renewal application shall be submitted at least one hundred eighty (180) calendar days before this permit expires. Filing of a timely and complete application shall cause the expired permit to continue in force to the effective date of the new permit. The permit's duration may be extended only through administrative extensions and not through interim modifications. If the permittee anticipates there will be no discharge after the expiration date of this permit, the Division should be promptly notified so that it can terminate the permit in accordance with Regulation 61.

Y. SECTION 307 TOXICS 

If a toxic effluent standard or prohibition, including any applicable schedule of compliance specified, is established by regulation pursuant to Section 307 of the Clean Water Act for a toxic pollutant which is present in the permittee's discharge and such standard or prohibition is more stringent than any limitation upon such pollutant in the discharge permit, the Division shall institute proceedings to modify or revoke and reissue the permit to conform to the toxic effluent standard or prohibition.

  

 

PART III

Table I—Testing Requirements for Organic Toxic Pollutants by Industrial Category for Existing Dischargers

                                                                            Industry Category                                                                                   

              Adhesives and sealants                                                      Ore mining

              Aluminum forming                                                             Organic chemicals manufacturing

              Auto and other laundries                                                   Paint and ink formulation

              Battery manufacturing                                                      Pesticides

              Coal mining                                                                       Petroleum refining

             Coil coating                                                                       Pharmaceutical preparations

             Copper forming                                                                 Photographic equipment and supplies

             Electrical and electronic components                                 Plastics processing

              Electroplating                                                                   Plastic and synthetic materials manufacturing

              Explosives manufacturing                                                  Porcelain enameling

              Foundries                                                                          Printing and publishing

              Gum and wood chemicals                                                  Pulp and paper mills

             Inorganic chemicals manufacturing                                    Rubber processing

              Iron and steel manufacturing                                             Soap and detergent manufacturing

             Leather tanning and finishing                                             Steam electric power plants

             Mechanical products manufacturing                                   Textile mills

              Nonferrous metals manufacturing                                      Timber products processing

             

   

 

 

           Volatiles

          Acid Compounds

            Base/Neutral

       Pesticides

1V acrolein

 

1A 2-chlorophenol

1B acenaphthene

 

1P aldrin

2V acrylonitrile

 

2A 2,4-dichlorophenol

2B acenaphthylene

 

2P alpha-B

3V benzene

 

3A 2,4-dimethylphenol

3B anthracene

 

3P beta-BHC

5V bromoform

 

4A 4,6-dinitro-o-cresol

4B benzidine

 

4P gamma-BHC

6V carbon tetrachloride

 

5A 2,4-dinitrophenol

5B benzo(a)anthracene

 

5P delta-BHC

7V chlorobenzene

 

6A 2-nitrophenol

6B benzo(a)pyrene

 

6P chlordane

8V chlorodibromomethane

 

7A 4-nitrophenol

7B 3,4-benzofluoranthene

 

7P 4,4′-DDT

9V chloroethane

 

8A p-chloro-m-cresol

8B benzo(ghi)perylene

 

8P 4,4′-DDE

10V 2-chloroethylvinyl ether

 

9A pentachlorophenol

9B benzo(k)fluoranthene

 

9P 4,4′-DDD

11V chloroform

 

10A phenol

10B bis(2-chloroethoxy)methane

 

10P dieldrin

12V dichlorobromomethane

 

11A 2,4,6-trichlorophenol

11B bis(2-chloroethyl)ether

 

11P alpha-endosulfan

14V 1,1-dichloroethane

   

12B bis(2-chloroisopropyl)ether

 

12P beta-endosulfan

15V 1,2-dichloroethane

   

13B bis (2-ethylhexyl)phthalate

 

13P endosulfan sulfate

16V 1,1-dichloroethylene

   

14B 4-bromophenyl phenyl ether

 

14P endrin

17V 1,2-dichloropropane

   

15B butylbenzyl phthalate

 

15P endrin aldehyde

18V 1,3-dichloropropylene

   

16B 2-chloronaphthalene

 

16P heptachlor

19V ethylbenzene

   

17B 4-chlorophenyl phenyl ether

 

17P heptachlor epoxide

20V methyl bromide

   

18B chrysene

 

18P PCB-1242

21V methyl chloride

   

19B dibenzo(a,h)anthracene

 

19P PCB-1254

22V methylene chloride

   

20B 1,2-dichlorobenzene

 

20P PCB-1221

23V 1,1,2,2-tetrachloroethane

   

21B 1,3-dichlorobenzene

 

21P PCB-1232

24V tetrachloroethylene

   

22B 1,4-dichlorobenzene

 

22P PCB-1248

25V toluene

26V 1,2-trans-

   

23B 3,3′-dichlorobenzidine

 

23P PCB-1260

                dichloroethylene

   

24B diethyl phthalate

 

24P PCB-1016

27V 1,1,1-trichloroethane

   

25B dimethyl phthalate

 

25P toxaphene

28V 1,1,2-trichloroethane

   

26B di-n-butyl phthalate

   

29V trichloroethylene

   

27B 2,4-dinitrotoluene

   

31V vinyl chloride

   

28B 2,6-dinitrotoluene

   
     

29B di-n-octyl phthalate

   
     

30B 1,2-diphenylhydrazine (as                     azobenzene)

   
     

31B fluroranthene

   
     

32B fluorene

   
     

33B hexachlorobenzene

   
     

34B hexachlorobutadiene

   
     

35B hexachlorocyclopentadiene

   
     

36B hexachloroethane

   
     

37B indeno(1,2,3-cd)pyrene

   
     

38B isophorone

   
     

39B napthalene

   
     

40B nitrobenzene

   
     

41B N-nitrosodimethylamine

   
     

42B N-nitrosodi-n-propylamine

   
     

43B N-nitrosodiphenylamine

   
     

44B phenanthrene

   
     

45B pyrene

   
     

46B 1,2,4-trichlorobenzene

   

Table II—Organic Toxic Pollutants in Each of Four Fractions in Analysis by Gas Chromatography/Mass

             

Table III—Other Toxic Pollutants (Metals and Cyanide) and Total Phenols

             Antimony, Total                                                                                                                                                                                   

             Arsenic, Total                                                                                                                                                                                   

             Beryllium, Total                                                                                                                                                                                   

            Cadmium, Total                                                                                                                                                                                   

            Chromium, Total                                                                                                                                                                                   

             Copper, Total                                                                                                                                                                                   

             Lead, Total                                                                                                                                                                                   

             Mercury, Total                                                                                                                                                                                   

             Nickel, Total                                                                                                                                                                                   

             Selenium, Total                                                                                                                                                                                   

             Silver, Total                                                                                                                                                                                    

             Thallium, Total                                                                                                                                                                                   

             Zinc, Total                                                                                                                                                                                   

             Cyanide, Total                                                                                                                                                                                   

             Phenols, Total                                                                                                                                                                                   

Table IV—Conventional and Nonconventional Pollutants Required To Be Tested by Existing Dischargers if Expected to be Present

            Bromide                                                                                                                                                                                   

            Chlorine, Total Residual                                                                                                                                                                                    

             Color                                                                                                                                                                                   

             Fecal Coliform                                                                                                                                                                                   

            Fluoride                                                                                                                                                                                   

             Nitrate-Nitrite                                                                                                                                                                                   

             Nitrogen, Total Organic                                                                                                                                                                                   

            Oil and Grease                                                                                                                                                                                   

             Phosphorus, Total                                                                                                                                                                                    

             Radioactivity                                                                                                                                                                                   

             Sulfate                                                                                                                                                                                   

             Sulfide                                                                                                                                                                                   

             Sulfite                                                                                                                                                                                   

             Surfactants                                                                                                                                                                                   

            Aluminum, Total                                                                                                                                                                                    

             Barium, Total                                                                                                                                                                                    

             Boron, Total                                                                                                                                                                                   

             Cobalt, Total                                                                                                                                                                                   

             Iron, Total                                                                                                                                                                                    

             Magnesium, Total                                                                                                                                                                                   

            Molybdenum, Total                                                                                                                                                                                   

             Manganese, Total                                                                                                                                                                                   

             Tin, Total                                                                                                                                                                                   

             Titanium, Total                                                                                                                                                                                   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table V—Toxic Pollutants and Hazardous Substances Required To Be Identified by Existing Dischargers  if Expected To Be Present

Toxic Pollutants

   

Asbestos

   

Hazardous Substances

   

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid [11CL-PF3OUDS]*

 

Mevinphos

2,2-Dichloropropionic acid

 

Mexacarbate

2,4,5-T (2,4,5-Trichlorophenoxy acetic acid)

 

Monoethyl amine

2,4,5-TP [2-(2,4,5-Trichlorophenoxy) propanoic acid]

 

Monomethyl amine

2,4-D (2,4-Dichlorophenoxy acetic acid)

 

2-[N-ethylperfluorooctanesulfonamido] acetic acid* 

2-[N-ethylperfluorooctanesulfonamido] acetic acid* 

 

2-[N-methylperfluorooctanesulfonamido] acetic acid* 

2-[N-methylperfluorooctanesulfonamido] acetic acid* 

 

Naled

2H,2H,3H,3H-Perfluorooctanoic acid [5:3 FTCA]*

 

Napthenic acid

3-Perfluoroheptyl propanoic acid [7:3 FTCA]*

 

Nitrotoluene

3-Perfluoropropyl propanoic acid [3:3 FTCA]*

 

Parathion

4,8-Dioxa-3H-perfluorononanoic acid [ADONA]*

 

Perfluorooctanoic Acid* 

4:2 Fluorotelomer sulfonic acid* 

 

Perfluorobutanoic Acid* 

6:2 Fluorotelomer sulfonic acid* 

 

Perfluorooctanesulfonamide* 

8:2 Fluorotelomer sulfonic acid* 

 

Perfluoropentanoic acid* 

9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid [9CL-PF3ONS]*

 

Perfluorohexanoic acid* 

Cresol

 

Perfluoroheptanoic acid*

Crotonaldehyde

 

Perfluorononanoic acid* 

Cyclohexane

 

Perfluorodecanoic acid* 

2,4-D (2,4-Dichlorophenoxy acetic acid)

 

Perfluoroundecanoic acid* 

Diazinon

 

Perfluorododecanoic acid* 

Dicamba

 

Perfluorotridecanoic acid* 

Dichlobenil

 

Perfluorotetradecanoic acid* 

Dichlone

 

Perfluorobutanesulfonic acid* 

2,2-Dichloropropionic acid

 

Perfluorodecanesulfonic acid* 

Dichlorvos

 

Perfluoroheptanesulfonic acid* 

Diethyl amine

 

Perfluorohexanesulfonic acid* 

Dimethyl amine

 

Perfluorooctanesulfonic acid* 

Dintrobenzene

 

Perfluoropentane sulfonic acid* 

Diquat

 

Perfluorononane sulfonic acid* 

Disulfoton

 

Phenolsulfanate

Diuron

 

Phosgene

Epichlorohydrin

 

Propargite

Ethion

 

Propylene oxide

Ethylene diamine

 

Pyrethrins

Ethylene dibromide

 

Quinoline

4:2 Fluorotelomer sulfonic acid* 

 

Resorcinol

6:2 Fluorotelomer sulfonic acid* 

 

Strontium

8:2 Fluorotelomer sulfonic acid* 

 

Strychnine

Formaldehyde

 

Styrene

Furfural

 

2,4,5-T (2,4,5-Trichlorophenoxy acetic acid)

Guthion

 

TDE (Tetrachlorodiphenylethane)

Hexafluoropropylene oxide dimer acid* 

 

2,4,5-TP [2-(2,4,5-Trichlorophenoxy) propanoic acid]

Isoprene

 

Trichlorofan

Isopropanolamine Dodecylbenzenesulfonate

 

Triethanolamine dodecylbenzenesulfonate

Kelthane

 

Triethylamine

Kepone

 

Trimethylamine

Malathion

 

Uranium

Mercaptodimethur

 

Vanadium

Methoxychlor

 

Vinyl acetate

 

Permit No.: COG591000


          Methyl mercaptan                                                              Xylene

          Methyl methacrylate                                                          Xylenol

          Methyl parathion                                                               Zirconium

* Parameter applicable to wastewater discharge only; it does not apply to biosolids.

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Online Form for Stormwater Discharge Noncompliance Event Reporting

As a requirement of the CDPS General Permit for Stormwater Discharges Associated with

Construction Activity (COR400000), permittees must notify the division of a noncompliance

event within 24 hours of the incident. The permittee must then follow up with a

five-day report indicating the steps they have taken to correct the issue and actions taken to prevent future events.

To streamline this reporting process, the division has created a new online form for

submission of these noncompliance notifications.

Construction Stormwater Permit Noncompliance Form

Please visit the compliance assistance page for more information or visit the noncompliance form guidance page for useful tips on filling out the form.

Stay informed

Visit our website for more information about COR400000 stormwater discharge permitting.

If you received this email from a colleague and are interested in subscribing to these notifications, please sign up using this form and select the topics that interest you.

You can update your preferences at any time using the link at the bottom of this email.

Contact

Email general questions to This email address is being protected from spambots. You need JavaScript enabled to view it.

cdphe.colorado.gov/water-quality

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Thursday, 17 February 2022 13:50

Commissioner Meeting Dates

Written by

Rio Grande County Commissioner meetings dates for 2022.

 

The County Commissioners of Rio Grande County will meet regularly on the following dates: January 12, 19, 26; February 2, 9, 16, 23; March 2, 9,

16, 23, 30; April 6, 13, 20, 27; May 4, 11, 18, 25; June 8, 15, 22, 29; July 13, 20, 27; August

3, 10, 17, 24, 31; September?, 14, 21, 28; October 5, 12, 19, 26; November 2, 9, 16;

December 7, 14, and 21.

Proposed Land Use Development Code Book Amendments

CSOC Membership Renewal Message for Sheriffs’ Offices

When you become an Honorary or Business member of County Sheriffs of Colorado you allow the organization to continually progress and improve the many services provided to your local sheriff agency.  Together, we understand that there is no greater factor for safeguarding our communities than the rule of law.  Law enforcement is an honorable profession and sheriff deputies perform their duties like unsung heroes in the pursuit of public safety.  Visit the website to learn more about CSOC and how you can be involved today!  https://www.coloradosheriffs.org/membership