COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY Molly Joseph Ward Secretary of Natural Resources VALLEY REGIONAL OFFICE P.O. Box 3000, Harrisonburg, Virginia 22801 (540) 574-7800 Fax (540) 574-7878 located at 4411 Early Road, Harrisonburg, VA www.deq.virginia.gov David K. Paylor Director Amy Thatcher Owens Regional Director January 19, 2016 Cathy C. Taylor, Director, Electric Environmental Services Dominion Resource Services, Inc. 5000 Dominion Boulevard Glen Allen, Virginia 23060 Re: Reissuance, VPDES Permit No. VA0004138, Dominion – Bremo Power Station Dear Ms. Taylor: The enclosed permit has been approved. This permit action involved reissuing a permit to discharge once-through condenser cooling water, stormwater, and industrial wastewater which includes wastewater from dewatering activities to facilitate the closure of three coal ash ponds and the metal cleaning waste treatment basin at the facility. Please continue to use the e-DMR program to submit the effluent data electronically. Please note that parameters with a sampling frequency less than monthly will only be reflected in the e-DMR in the months designated by the permit. As provided by Rule 2A:2 of the Supreme Court of Virginia, you have thirty days from the date of service (the date you actually received this decision or the date it was mailed to you, whichever occurred first) within which to appeal this decision by filing a notice of appeal in accordance with the Rules of the Supreme Court of Virginia with the Director, Department of Environmental Quality. In the event that this decision is served on you by mail, three days are added to that period. Alternatively, any owner under §§ 62.1 - 44.16, 62.1 - 44.17, and 62.1 - 44.19 of the State Water Control Law aggrieved by any action of the State Water Control Board taken without a formal hearing, or by inaction of the Board, may demand in writing a formal hearing of such owner's grievance, provided a petition requesting such hearing is filed with the Board. Said petition must meet the requirements set forth in §1.23(b) of the Board's Procedural Rule No. 1. In cases involving actions of the Board, such petition must be filed within thirty days after notice of such action is mailed to such owner by certified mail. Permit No. VA0004138 Dominion – Bremo Power Station Page 2 If you have questions about this permit, please do not hesitate to contact me at (540) 574-7892 or brandon.kiracofe@deq.virginia.gov. Sincerely, Brandon D. Kiracofe Regional Water Permits & Compliance Manager Enclosure: Permit No. VA0004138 cc: EPA, Region III – 3WP12 (electronic) L. Ferguson-Davie – VRO (electronic) FileNet – VA0004138 MEMORANDUM DEPARTMENT OF ENVIRONMENTAL QUALITY VALLEY REGIONAL OFFICE 4411 Early Road - P.O. Box 3000 Harrisonburg, VA 22801 SUBJECT: Reissuance of VPDES Permit No.VA0004138, Dominion – Bremo Power Station TO: Regional Director FROM: Regional Water Permits & Compliance Manager DATE: January 19, 2016 COPIES: VRO Permit Processing File Other Agency Comments: EPA had no objections to the initial draft permit or the revised draft permit. DGIF, DCR, and USFWS provided comments on the initial draft permit and the revised draft permit. No other agency comments were received. Public Notice Comments: DEQ held a public hearing on December 1, 2015. DEQ also provided an informational session prior to the hearing so that questions could be asked and answered prior to the hearing. Approximately 60 people attended the public hearing with 16, including the applicant, providing oral comments during the public hearing. During the 45-day public comment period of the draft permit DEQ received 630 comments by email or letter. The comments and staff responses are summarized in Attachment B of the State Water Control Board Memorandum dated December 29, 2015. Board Action: The permit action was presented to the Board on January 14, 2016. By a vote of five to one, the Board: 1. Found that: a. The permit was prepared in conformance with all applicable statues, regulations, and agency practices; b. The effluent limits and conditions in the permit were established to protect instream beneficial uses and fish and wildlife resources; and c. All public comments relevant to the permit were considered. 2. Approved the permit and conditions as presented; and 3. Authorized the Director to issue the permit as approved by the Board. Staff Comments: Processing of this permit was delayed due to the need to develop requirements for dewatering discharges, as well as by the need to hold a hearing and present this permit at the Board meeting. COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY Permit No. VA0004138 Effective Date: January 19, 2016 Expiration Date: December 31, 2020 AUTHORIZATION TO DISCHARGE UNDER THE VIRGINIA POLLUTANT DISCHARGE ELIMINATION SYSTEM AND THE VIRGINIA STATE WATER CONTROL LAW In compliance with the provisions of the Clean Water Act as amended and pursuant to the State Water Control Law and regulations adopted pursuant thereto, the following owner is authorized to discharge in accordance with the information submitted with the permit application, and with this permit cover page, Part I Effluent Limitations and Monitoring Requirements, and Part II – Conditions Applicable To All VPDES Permits, as set forth herein. Owner: Facility Name: County: Facility Location: Virginia Electric and Power Company Dominion – Bremo Power Station Fluvanna 1038 Bremo Road, Bremo Bluff The owner is authorized to discharge to the following receiving stream: Stream: River Basin: River Subbasin: Section: Class: Special Standards: James River (Outfalls 001-004 and 006-008) Holman Creek (Outfall 009) James River (Middle) N/A 10 III None Amy T. Owens, Regional Director Valley Regional Office Date: January 19, 2016 Permit No. VA0004138 Part I Page 1 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 1. During the period beginning with the permit’s effective date and lasting until the permit’s expiration date, the permittee is authorized to discharge from Outfall 001 (Once-Through Condenser Cooling Water). This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Flow (MGD) a pH (standard units) Total Residual Chlorine (TRC)(mg/L) 9 Heat Rejection (x10 BTU/Hr) b,c d MONITORING REQUIREMENTS Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NL 1/Day Calculated NA NA 6.0 9.0 1/Month Grab 0.0099 NA NA 0.02 1/Day Grab NA NA NA 1.62 1/Month Calculated Temperature (°C) NL NA NA NL 1/Day IS Intake Temperature (°C) NL NA NA NL 1/Day IS NL = No Limitation, monitoring required a. b. c. d. e. NA = Not Applicable IS = Immersion Stabilization There are no wastewater treatment facilities. The permit is based on a once-through condenser cooling water flow of 157.6 MGD. See Part I.C for additional monitoring instructions. When chlorine is not applied the daily maximum shall be reported as “NR” meaning not required. See Part I.G.10 for additional monitoring instructions. See Part I.G.13 for additional monitoring instructions. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 2 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 2. During the period beginning with the permit’s effective date and lasting until the permit’s expiration date, the permittee is authorized to discharge from internal Outfall 101 (Traveling Screen Backwash). This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Weekly Average Minimum MONITORING REQUIREMENTS Maximum Frequency Internal Outfall 101 shall contain only river water from the screen backwash. No monitoring of this outfall is required. a. b. There shall be no discharge of process wastewater from this outfall. There shall be no discharge of floating solids or visible foam in other than trace amounts. Sample Type Permit No. VA0004138 Part I Page 3 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 3. During the period beginning with the permit’s effective date and lasting until the permit’s expiration date, the permittee is authorized to discharge from internal Outfall 203 (Discharge from the Sewage Treatment Plant prior to discharge into the Stormwater Management Pond). This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Flow (MGD) a pH BOD5 c Total Suspended Solids E. coli (N/100 mL) b c MONITORING REQUIREMENTS Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NA NA 6.0 NL 1/Month Estimate 9.0 1/Month Grab 1/Month Grab 30 mg/L 4.9 kg/d 45 mg/L 7.4 kg/d NA NA 30 mg/L 4.9 kg/d 45 mg/L 7.4 kg/d NA NA 1/Month Grab NA 4/Month in any month of each calendar year 10 a.m. to 4 p.m. Grab 126 Geometric Mean NA NA NL = No Limitation, monitoring required NA = Not Applicable 4/Month in any month of each calendar year = 4 samples with at least 1 sample taken each calendar week, in any calendar month and reported with the December DMR due January 10th of every year a. b. c. d. The design flow of this treatment facility is 0.0432 MGD. See Part I.G.1 for additional requirements related to facility flows. See Part I.B for disinfection requirements. See Part I.C for additional monitoring instructions. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 4 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 4. During the period beginning with the permit’s effective date and lasting until one of the conditions in Part I.G.19 is met or until internal Outfall 202 is retired, or until the permit’s expiration date whichever occurs first, the permittee is authorized to discharge from internal Outfall 202. Internal Outfall 202 is only authorized to discharge to the West Ash Pond. This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Flow (MGD) a Total Suspended Solids (mg/L) b Oil and Grease (mg/L) Total Iron b b Total Copper b NL = No Limitation, monitoring required a. b. c. Weekly Average Minimum MONITORING REQUIREMENTS Maximum Frequency Sample Type NL NA NA NL 1/Month Estimate 30.0 NA NA 100.0 1/Month Grab 15.0 NA NA 20.0 1/Month Grab 1.0 mg/L 3.8 kg/d NA NA 1.0 mg/L 6.1 kg/d 1/Month Grab 1.0 mg/L 3.8 kg/d NA NA 1.0 mg/L 6.1 kg/d 1/Month Grab NA = Not Applicable The limits are based on a maximum 30-day average flow of 1.0146 MGD and a daily maximum flow of 1.6138 MGD. See Part I.C for additional monitoring instructions. Internal Outfall 202 will be retired following the closure of the Metals Cleaning Waste Treatment Basin. Permit No. VA0004138 Part I Page 5 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 5. During the period beginning with the permit’s effective date and lasting until the permit’s expiration date, the permittee is authorized to discharge from Outfall 002. Any discharge from the West Ash Pond to an external outfall must meet the requirements in Part I.A.9. This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Flow (MGD) a pH (standard units) Total Suspended Solids (mg/L) Oil & Grease (mg/L) b b Total Residual Chlorine (TRC)(mg/L) b,c TKN (mg/L) b Nitrite-N + Nitrate-N (mg/L) Total Nitrogen (mg/L) b,f Total Phosphorus (mg/L) b b MONITORING REQUIREMENTS Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NL 2/Month Estimate NA NA 6.0 9.0 2/Month Grab 30.0 NA NA 100.0 2/Month Grab 15.0 NA NA 20.0 2/Month Grab 0.036 NA NA 0.072 1/Day Grab NA NA NA NL 1/Year Grab NA NA NA NL 1/Year Grab NA NA NA NL 1/Year Calculated NA NA NA NL 1/Year Grab NL = No Limitation, monitoring required NA = Not Applicable 2/Month = 2 samples taken during the calendar month, no less than 7 days apart 1/Year = Annual sampling with the results submitted with the DMR due January 10th of each year a. b. c. d. e. f. g. The limits are based on a flow of 4.2912 MGD. See Part I.C for additional monitoring and reporting requirements. Effluent from the Stormwater Management Pond may be discharged through Outfall 002. TRC limits and monitoring apply if effluent from the Stormwater Management Pond is discharged through Outfall 002. Sampling for the parameters listed above may take place prior to commingling with treated process wastewater from internal Outfalls 501, 502, 503, 504, and 505. During the dewatering activities when Part I.A.9 is effective, process wastewater from internal Outfalls 501, 502, 503, 504, and 505 may be discharged through Outfall 002. Total Nitrogen, which is the sum of TKN and Nitrite-N + Nitrate-N, shall be derived from the results of those tests. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 6 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 6. During the period beginning with the permit’s effective date and lasting until Outfall 003 is retired, or until the permit’s expiration date, whichever comes first, the permittee is authorized to discharge from Outfall 003. a. b. c. d. During the period prior to Part I.A.9 becoming effective, Outfall 003 shall contain only stormwater not exposed to industrial activity. There shall be no discharge of process wastewater from Outfall 003 prior to Part I.A.9 becoming effective. During the dewatering activities when Part I.A.9 is effective, process wastewater from internal Outfalls 501, 502, 503, 504, and 505 may be discharged through Outfall 003. Outfall 003 will be retired following the completion of the dewatering activities at the facility. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 7 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 7. During the period beginning with the permit’s effective date and lasting until Outfall 004 is retired, or until the permit’s expiration date, whichever occurs first, the permittee is authorized to discharge from Outfall 004. Any discharge from the North Ash Pond to an external outfall must meet the requirements in Part I.A.9. This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Flow (MGD) a pH (standard units) Total Suspended Solids (mg/L) Oil & Grease (mg/L) b b Total Residual Chlorine (TRC)(mg/L) b,c MONITORING REQUIREMENTS Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NL 2/Month Estimate NA NA 6.0 9.0 2/Month Grab 30.0 NA NA 100.0 2/Month Grab 15.0 NA NA 20.0 2/Month Grab 0.036 NA NA 0.072 1/Day Grab NL = No Limitation, monitoring required NA = Not Applicable 2/Month = 2 samples taken during the calendar month, no less than 7 days apart a. b. c. d. e. f. g. The limits are based on a flow of 4.2912 MGD. See Part I.C for additional monitoring and reporting requirements. Effluent from the Stormwater Management Pond may be discharged through Outfall 004. TRC limits and monitoring apply if effluent from the Stormwater Management Pond is discharged through Outfall 004. Sampling for the parameters listed above may take place prior to commingling with treated process wastewater from internal Outfalls 501, 502, 503, 504, and 505. During the dewatering activities when Part I.A.9 is effective, process wastewater from internal Outfalls 501, 502, 503, 504, and 505 may be discharged through Outfall 004. Outfall 004 will be retired following the completion of the dewatering activities at the facility. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 8 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 8. During the period beginning with the permit’s effective date and lasting until the permit’s expiration date, whichever comes first, the permittee is authorized to discharge from Outfall 006. a. b. c. d. During the period prior to Part I.A.9 becoming effective, Outfall 006 shall contain only stormwater not exposed to industrial activity. There shall be no discharge of process wastewater from Outfall 006 prior to Part I.A.9 becoming effective. During the dewatering activities when Part I.A.9 is effective, process wastewater from Outfalls 501, 502, 503, 504, and 505 may be discharged through Outfall 006. Following the dewatering activities, Outfall 006 shall contain only stormwater not associated with a regulated industrial activity where monitoring would be required. There shall be no discharge of process wastewater from Outfall 006 during this period. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 9 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 9. During the period beginning with the permit’s effective date and lasting until completion of dewatering activities, or until the permit’s expiration date, whichever comes first, the permittee is authorized to discharge from internal Outfall 501 (process wastewater from dewatering activities in the West Ash Pond), Outfall 502 (process wastewater from dewatering activities in the North Ash Pond), Outfall 503 (process wastewater from dewatering activities in the East Ash Ponds), Outfall 504 (combination of process wastewaters from dewatering activities in the West Ash Pond, North Ash Pond, East Ash Ponds, and Metals Cleaning Waste Treatment Basin), and Outfall 505 (process wastewater from dewatering activities in the Metal Cleaning Waste Treatment Basin). Any process wastewater removed from the West Ash Pond, North Ash Pond, and East Ash Ponds for discharge purposes is considered to be process wastewater from dewatering activities. See Part I.G.19 for requirements regarding the decanting and dewatering of the Metal Cleaning Waste Treatment Basin. This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Flow (MGD) a pH (standard units) h,j Total Suspended Solids (mg/L) b,h,j MONITORING REQUIREMENTS Monthly Average Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NL 1/Day Estimate NA NA 6.0 9.0 3/Week Grab 30.0 NA NA 100.0 3/Week 4 HC Oil & Grease (mg/L) b,h,j 15.0 NA NA 20.0 3/Week 4 HC Total Recoverable Antimony (ug/L) b,h,j 2,100 NA NA 2,100 3/Week 4 HC Total Recoverable Arsenic (ug/L) b,h,j 290 NA NA 530 3/Week 4 HC Total Recoverable Cadmium (ug/L) b,h,j 1.8 NA NA 3.2 3/Week 4 HC Total Recoverable Chromium III (ug/L) b,h,j 120 NA NA 220 3/Week 4 HC Total Recoverable Chromium VI (ug/L) b,h,j 18 NA NA 34 3/Week 4 HC Total Recoverable Copper (ug/L) b,h,j 12 NA NA 23 3/Week 4 HC Total Recoverable Lead (ug/L) b,h,j 19 NA NA 35 3/Week 4 HC 1.5 NA NA 2.8 3/Week 4 HC 31 NA NA 57 3/Week 4 HC 9.6 NA NA 18 3/Week 4 HC 2.7 NA NA 5.0 3/Week 4 HC 1.4 NA NA 1.4 3/Week 4 HC 110 NA NA 210 3/Week 4 HC Total Recoverable Mercury (ug/L) b,h,j Total Recoverable Nickel (ug/L) b,h,j Total Recoverable Selenium (ug/L) b,h,j Total Recoverable Silver (ug/L) b,h,j Total Recoverable Thallium (ug/L) b,h,j Total Recoverable Zinc (ug/L) b,h,j Chloride (mg/L) b,h,j 450 NA NA 820 3/Week 4 HC Ammonia-N (mg/L) b,h,j 9.6 NA NA 14 3/Week 4 HC Hardness (mg/L as CaCO3) h,i NL NA NA NL 3/Week 4 HC Cyanide, Free (ug/L) i NL NA NA NL 1/Month 4 HC NL NA NA NL 1/Month 4 HC NL NA NA NL 1/Month 4 HC Total Recoverable Aluminum (ug/L) Total Recoverable Barium (ug/L) i Total Recoverable Beryllium (ug/L) i i NL NA NA NL 1/Month 4 HC Total Recoverable Boron (ug/L) i NL NA NA NL 1/Month 4 HC i NL NA NA NL 1/Month 4 HC Total Recoverable Cobalt (ug/L) Permit No. VA0004138 Part I Page 10 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 9. Continued from previous page EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS Monthly Average Weekly Average Minimum Maximum Frequency Sample Type NL NA NA NL 1/Month 4 HC NL NA NA NL 1/Month 4 HC NL NA NA NL 1/Month 4 HC NA NA 100 NA 1/Month 24 HC NA NA NA 6.25 1/Month 24 HC NA NA 100 NA 1/Month 24 HC NA NA NA 6.25 1/Month 24 HC Total Recoverable Iron (ug/L) i Total Recoverable Molybdenum (ug/L) i Total Recoverable Vanadium (ug/L) i Acute Whole Effluent Toxicity, Ceriodaphnia dubia (%) c,j Chronic Whole Effluent Toxicity, Ceriodaphnia dubia (TUc) c,j Acute Whole Effluent Toxicity, Pimephales promelas (%) c,j Chronic Whole Effluent Toxicity, Pimephales promelas (TUc) c,j NL = No Limitation, monitoring required a. b. c. d. e. f. g. h. i. j. MONITORING REQUIREMENTS NA = Not Applicable 4 HC = 4- hour Composite 24 HC = 24- hour Composite The limits are based on a flow of 10.2912 MGD. See Part I.C for additional monitoring instructions. See Part I.E for additional monitoring instructions. The discharges from internal Outfalls 501, 502, 503, 504, and 505 are authorized to discharge to the Stormwater Management Pond and West Treatment Pond and through Outfalls 002, 003, 004, and/or 006. Ash dewatering water (pore water within the coal combustion residuals mass) and contact stormwater (stormwater that has contacted the coal combustion residuals) are process wastewater from dewatering activities. Compliance with the limits above may be demonstrated with or without additional treatment. There shall be no discharge of floating solids or visible foam in other than trace amounts. Sampling for the parameters identified with a monitoring frequency of “3/Week” for Internal Outfalls 501, 502, 503, 504, and 505 shall occur at least three (3) days per week with a minimum of 48 hours between sampling events. A sampling week extends Sunday through Saturday. The permittee shall contract to receive results for parameters identified with a monitoring frequency of “3/Week” within four business days of taking the sample. Results of the weekly sampling shall be reported to DEQ no later than the close of business Friday of the week following sample collection. This reporting requirement does not substitute for, or alter, Part II.C concerning the monthly reporting of monitoring results with the Discharge Monitoring Report. The composite period for the parameters identified with a monitoring frequency of “1/Month” for Internal Outfalls 501, 502, 503, and 505 shall occur within the composite period for the Whole Effluent Toxicity monitoring. See Part I.G.22 for additional requirements. Permit No. VA0004138 Part I Page 11 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 10. During the period beginning with the discharge of process wastewater from dewatering activities through internal Outfalls 501, 502, 503, 504, and 505 and lasting until the discharge of process wastewater from dewatering activities ceases, or until the permit’s expiration date, whichever comes first, the permittee is authorized to discharge from Outfall 999a. This discharge shall be limited and monitored as specified below: EFFLUENT CHARACTERISTICS Flow, MGD NL = No Limitation, monitoring required a. DISCHARGE LIMITATIONS MONITORING REQUIREMENTS Monthly Average Weekly Average Minimum Maximum Frequency Sample Type NL NA NA 10.2912 1/Month Calculated NA = Not Applicable Outfall 999 is not an existing discharge point. It is a means of reporting total flow discharged through internal Outfalls 501, 502, 503, 504, and 505 during the dewatering activities for the North Ash Pond, East Ash Ponds, West Ash Pond, and Metal Cleaning Waste Treatment Basin. The limits are based on a flow of 10.2912 MGD. Permit No. VA0004138 Part I Page 12 of 39 A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS – FINAL CONFIGURATION 11. Upon completion of construction of Outfalls 007, 008, and 009 and lasting until the permit’s expiration date, the permittee is authorized to discharge from Outfalls 007, 008, and 009. a. b. c. Outfalls 007, 008, and 009 shall contain only stormwater not exposed to industrial activity. There shall be no discharge of process wastewater from these outfalls. There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit No. VA0004138 Part I Page 13 of 39 B. ADDITIONAL TRC AND E. COLI LIMITATIONS AND MONITORING REQUIREMENTS – Outfall 203 1. TRC shall be monitored at the outlet of each operating chlorine contact tank, 1/Day by grab sample. 2. No more than 3 samples for TRC taken at the outlet of each operating chlorine contact tank, shall be less than 1.0 mg/L for any one calendar month. 3. No TRC sample collected at the outlet of any operating chlorine contact tank, shall be less than 0.6 mg/L. 4. If chlorine disinfection is not used, E. coli shall be limited and monitored by the permittee as specified below: E. coli (N/100 mL) Discharge Limit Monthly Average 126 (Geometric Mean) Monitoring Requirements Frequency Sample Type 4/Month* Grab Between 10 a.m. and 4 p.m. *4/Month = 4 samples taken monthly, with at least 1 sample taken each calendar week This E. coli requirement, if applicable, shall substitute for the TRC and E. coli requirements specified above and elsewhere in this permit. C. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - ADDITIONAL INSTRUCTIONS 1. The quantification levels (QLs) shall be less than or equal to the following concentrations: Effluent Characteristic BOD5 Total Suspended Solids Total Residual Chlorine Ammonia-N Oil & Grease Chloride Total Recoverable Antimony Total Recoverable Arsenic Total Recoverable Cadmium Total Recoverable Chromium III Total Recoverable Chromium VI Total Recoverable Copper Total Recoverable Lead Total Recoverable Mercury Total Recoverable Nickel Total Recoverable Selenium Total Recoverable Silver Total Recoverable Thallium Total Recoverable Zinc Total Copper Total Iron QL 2 mg/L 1.0 mg/L 0.10 mg/L 0.20 mg/L 5.0 mg/L 10 mg/L 5.0 µg/L 5.0 µg/L 1.0 µg/L 5.0 µg/L 5.0 µg/L 5.0 µg/L 5.0 µg/L 0.1 µg/L 5.0 µg/L 5.0 µg/L 0.4 µg/L 1.0 µg/L 25 µg/L 5.0 µg/L 0.25 mg/L The QL is defined as the lowest concentration used to calibrate a measurement system in accordance with the procedures published for the method. It is the responsibility of the permittee to ensure that proper quality assurance/quality control (QA/QC) protocols are followed during the sampling and analytical procedures. QA/QC information shall be documented to confirm that appropriate analytical procedures have been used and the required QLs have been attained. The permittee shall use any method in accordance with Part II.A of this permit. Permit No. VA0004138 Part I Page 14 of 39 2. Compliance Reporting a. Monthly Average – Compliance with the monthly average limitations and/or reporting requirements for the parameters listed in Part I.C.1 shall be determined as follows: All concentration data below the QL used for the analysis shall be treated as zero. All concentration data equal to or above the QL used for the analysis shall be treated as it is reported. An arithmetic average shall be calculated using all reported data for the month, including the defined zeros. This arithmetic average shall be reported on the Discharge Monitoring Report (DMR) as calculated. If all data are below the QL used for the analysis, then the average shall be reported as "