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HomeMy WebLinkAboutNC0025453_Draft Permit_200607051 July 3, 2006 27520 Dear Mr. Biggs: Copies: Mr. Steve Biggs, Manager Town of Clayton P.O. Box 879 Clayton, North Carolina The Division has reviewed your June 8, 2006, request to modify the NPDES permit for the Town’s Little Creek WRF and has made a tentative determination to modify the permit as requested. We are enclosing a copy of the draft permit and fact sheet for your review and comment. The proposed modification will increase the Town’s Total Nitrogen (TN) discharge limits from 21,400 to 28,736 lb/yr, reflecting your recent purchase of 7,336 lb/yr of discharge TN allocation (3,668 lb/yr as estuaiy allocation) from the South Granville Water and Sewer Authority. The change becomes effective January 1, 2007, and is conditioned upon prior closure of the purchase per the Agreement of Purchase and Sale. The draft permit also includes one minor correction, changing a previous reference on its cover page from the Water Quality Commission to the Environmental Management Commission. At this time, the Division is submitting a notice to the newspapers of general circulation in Wake County, inviting public comment on the draft modification. The notice is scheduled for publication on or about July 7. Following a 30-day comment period, we will review all pertinent comments received and take appropriate action on the permit. Please provide any comments you have regarding the draft permit to this office, in writing, no later than August 7. If you have any questions concerning the draft permit, please contact me at (919) 733-5083, extension 541, or at mike.templeton@ncmail.net. Michael F. Easley, Governor State of North Carolina William G. Ross, Jr., Secretary Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality Subject: Draft NPDES Permit Modification Permit NC0025453 Clayton - Little Creek WRF Johnston County NorthCarolinaNaturally Division of Water Quality, Point Source Branch Telephone (919) 733-7015 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 FAX (919) 733-0719 512 N. Salisbury Street, Raleigh, North Carolina 27604 On the Internet at http://h2o.enr.state.nc.us/ An Equal Opportunity/Affirmative Action Employer Sincerely, Michael E. Templetdn, P.E. Point Source Branch Enclosure: Draft permit modification, NC0025453 Fact Sheet James C. Wrenn, Jr. - Hopper, Hicks & Wrenn, LLP; PO Box 247; Oxford, NC 27565 Chief, NPDES and Biosolids Permits Section, Region IV, EPA Raleigh Regional Office, Surface Water Protection Central Files NPDES Files 5 7 Permit No. NC0025453 PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM is hereby authorized to discharge wastewater from a facility located at to receiving waters designated as the Neuse River in the Neuse River Basin This permit shall become effective March 31, 2008. Signed this day DRAFT Town of Clayton Little Creek Water Reclamation Facility Alan W. Klimek, P.E., Director Division of Water Quality By the Authority of the Environmental Management Commission In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, the in accordance with the discharge limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof. Issued March 11, 2003 Modified STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY Little Creek Water Reclamation Facility On Durham Street Extension Clayton Johnston County Clayton WWTP NPDES No. NC0025453 This permit and the authorization to discharge shall expire at midnight on Permit No. NC0025453 SUPPLEMENT TO PERMIT COVER SHEET is hereby authorized to: 1. 2. 3.After receiving an Authorization to Operate from the Division of Water Quality, the Town may operate the facility to a maximum design flow of 2.5 MGD, and discharge to the point listed above. Discharge wastewater from said treatment works at the location specified on the attached map into the Neuse River, which is classified WS-IV NSW CA waters, in the Neuse River Basin. Town of Clayton Little Creek Water Reclamation Facility Town of Clayton NPDES No. NC0025453 Continue to operate an existing 1.9 MGD wastewater treatment facility consisting of a mechanical bar screen, grit removal, parshall flume with flow measurement, primary clarifier/digester, trickling filter, dual oxidation ditches, dual secondary clarifiers, tertiary filters, ultraviolet disinfection, chlorine contact chamber, sulfur dioxide dechlorination, sludge thickener tank, aerobic sludge digester, and sludge drying beds located at the Little Creek Water Reclamation Facility, Durham Street Extension, Clayton, Johnston County, and A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Effluent Limitations Effluent Characteristics Sample Type Flow Recording 5.0 mg/l 7.5 mg/l Daily Composite 10.0 mg/l 15.0 mg/l Daily Composite 30.0 mg/l 45.0 mg/l Daily Composite 200/100 ml 400/100 ml 28 pg/l Grab 6-9 (Footnotes on next page) Issued March 11, 2003 Modified__________ Weekly Average Daily Maximum Town of Clayton NPDES No. NC0025453 Conductivity Conductivity Fecal Coliform (geometric mean) Fecal Coliform (geometric mean) Monitor & Report Monitor & Report Monitor & Report Monitor & Report Monitor & Report (Ib/month) 21,400 Ib/year (Annual Mass Loading)7-** 2.0 mg/L (Quarterly Average) 2.0 mg/l 4,0 mg/l 6.0 mg/l 12.0 mg/l Monitoring Requirements Measurement Frequency Continuous Quarterly Monthly Monthly Monthly Daily Daily Weekly Weekly Weekly Monthly Monthly Annually Weekly Daily 3/Week Daily Daily Daily 3/Week Daily 3/Week Daily 3/Week Composite Composite Grab Grab Composite Composite Composite Calculated Calculated Calculated Composite Composite Composite Composite Grab Composite Grab Grab Grab Grab Grab Grab Sample Location^ Influent or Effluent Influent & Effluent Influent & Effluent Influent & Effluent Effluent Effluent Effluent Upstream & Downstream Effluent Upstream & Downstream Effluent Effluent Effluent Upstream & Downstream Effluent Upstream & Downstream Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent NHa as N [April 1 - October 31] NH3 as N [November 1 - March 31] Dissolved Oxygen^________ Dissolved Oxygen Chronic Toxicity1 Q Copper_______ Zinc_________ Silver________ PHU BOD, 5 day (20°C)2 [April 1 - October 31] BOD, 5 day (20°C)2 [November 1 - March 31] Total Suspended Residue2 Monthly Average 1.9MGD During the period beginning on the effective date of the permit and lasting until expansion or expiration, the Permittee is authorized to discharge 1.9 MGD of municipal wastewater from outfall OO1. Such discharges shall be limited and monitored by the Permittee as specified below: Total Residual Chlorine^ TKN (mg/l) NO2-N + NO3-N (mg/l) TN (mg/l)5_________ Total Monthly Flow (MG) TN Load6 Total Phosphorus 6 Temperature (°C) Temperature (°C) Footnotes: 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1. 4. There shall be no discharge of floating solids or visible foam in other than trace amounts. L 10. Chronic Toxicity (Ceriodaphnia dubia) P/F at 1.6%: March, June, September, and December [see Special Condition A.(5)]. Toxicity monitoring shall coincide with metals monitoring. 11. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample. Issued March 11, 2003 Modified Per ISA NCAC 2B .0505(c)(4), stream sampling (as well as influent/effluent sampling) may be discontinued when flow conditions could result in injury or death of the person(s) collecting the samples. In such cases, on each day that sampling is discontinued, written justification shall be specified in the monitoring report for the month in which the event occurred. Total residual chlorine is required only if chlorine is used as a disinfectant (or elsewhere in the process). A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL (Continued) Town of Clayton NPDES No. NC0025453 2. The monthly average effluent BODS and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). 5. TN means Total Nitrogen. For a given wastewater sample, TN is the sum of Total Kjeldahl Nitrogen and Nitrate-Nitrite Nitrogen: TN = TKN + NO2-N + NO3-N. 6. TN Load is the mass load of TN discharged by the Permittee in a period of time. See Special Condition A.(3.), Calculation of TN Loads. 7. The annual TN Load limit shall become effective with the calendar year beginning on January 1, 2003. Compliance with this limits shall be determined in accordance with Special Condition A.(4.), Annual Limits for Total Nitrogen. 9. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar quarter (January-March, April-June, July-September, October- December). 1. Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1700, D - Downstream at (1) NC Highway 42 and (2) NCSR 1908. Stream samples shall be grab samples and shall be collected 3/Week during June - September and 1 /Week during the remaining months of the year. Instream monitoring is provisionally waived in light of the permittee’s participation in the Lower Neuse Basin Association. Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. 8. Effective January 1, 2007, the TN Load limit shall increase to 28,736 Ib/yr; provided that the Permittee demonstrates to the Division the closure of its purchase of 7,336 Ib/yr allocation (3,668 Ib/yr at estuary) from the South Granville Water and Sewer Authority according to the Agreement of Purchase and Sale. A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Effluent Limitations Effluent Characteristics Sample Type Flow Recording 5.0 mg/l 7.5 mg/l Daily Composite 10.0 mg/l 15.0 mg/l CompositeDaily 30.0 mg/l 45.0 mg/l Daily Composite 200/100 ml 400/100 ml Grab28 pg/l 6-9 (Footnotes on next page) j During the period beginning upon expansion above 1.9 MGD or expiration, the Permittee is authorized to discharge up to 2.5 MGD of municipal wastewater from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: Issued March 11, 2003 Modified____________ Weekly Average Daily Maximum Town of Clayton NPDES No. NC0025453 Fecal Coliform (geometric mean) Fecal Coliform (geometric mean) Conductivity Conductivity Monitor & Report Monitor & Report Monitor & Report Monitor & Report Monitor & Report (Ib/month) 21,400 Ib/year (Annual Mass Loading)?^ 2.0 mg/L (Quarterly Average) 1.0 mg/l 2.0 mg/l 3.0 mg/l 6.0 mg/l Monitoring Requirements Measurement Frequency Continuous Daily Weekly Weekly Weekly Monthly Monthly Annually Weekly Daily 3/Week Daily 3/Week Composite Composite Grab Grab Composite Composite Composite Calculated Calculated Calculated Composite Grab Grab Composite Composite Composite Composite Grab Grab Grab Grab Grab Sample Location^ Influent or Effluent Influent & Effluent Influent & Effluent Influent & Effluent Effluent Effluent Effluent Upstream & Downstream Effluent Upstream & Downstream Effluent Effluent Effluent Upstream & Downstream Effluent Upstream & Downstream Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Chronic Toxicity10 Copper_______ Zinc_________ Silver________ PHU NHa as N [April 1 - October 31] NHa as N [November 1 - March 31] Dissolved Oxygen^_________ Dissolved Oxygen Quarterly Monthly Monthly Monthly Daily Daily Daily Daily 3/Week Daily 3/Week Monthly Average 2.5 MGD Total Residual Chlorine4 TKN (mg/l) NO2-N + NO3-N (mg/l) TN (mg/l)5_________ Total Monthly Flow (MG) TN Load6 BOD, 5 day (20°C)2 [April 1 - October 31] BOD, 5 day (20°C)2 [November 1 - March 31] Total Suspended Residue2 Total Phosphorus 9 Temperature (°C) Temperature (°C) Footnotes: 1. 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1. 8. There shall be no discharge of floating solids or visible foam in other than trace amounts. L 10. Chronic Toxicity (Ceriodaphnia dubia) P/F at 2.0 %: March, June, September, and December [see Special Condition A. (6)]. Toxicity monitoring shall coincide with metals monitoring. 11. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample. Issued March 11, 2003 Modified Per ISA NCAC 2B .0505(c)(4), stream sampling (as well as influent/effluent sampling) may be discontinued when flow conditions could result in injury or death of the person(s) collecting the samples. In such cases, on each day that sampling is discontinued, written justification shall be specified in the monitoring report for the month in which the event occurred. Effective January 1, 2007, the TN Load limit shall increase to 28,736 Ib/yr; provided that the Permittee demonstrates to the Division the closure of its purchase of 7,336 Ib/yr allocation (3,668 Ib/yr at estuary) from the South Granville Water and Sewer Authority according to the Agreement of Purchase and Sale. Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1700, D - Downstream at (1) NC Highway 42 and (2) NCSR 1908. Stream samples shall be grab samples and shall be collected 3/Week during June - September and 1 /Week during the remaining months of the year. Instream monitoring is provisionally waived in light of the permittee’s participation in the Lower Neuse Basin Association. Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL (Continued) Town of Clayton NPDES No. NC0025453 9. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar quarter (January-March, April-June, July-September, October- December). 5. TN means Total Nitrogen. For a given wastewater sample, TN is the sum of Total Kjeldahl Nitrogen and Nitrate-Nitrite Nitrogen: TN = TKN + NO2-N + NO3-N. 7. The annual TN Load limit shall become effective with the calendar year beginning on January 1, 2003. Compliance with this limits shall be determined in accordance with Special Condition A.(4.), Annual Limits for Total Nitrogen. 2. The monthly average effluent BODS and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). 4. Total residual chlorine is required only if chlorine is used as a disinfectant (or elsewhere in the process). 6. TN Load is the mass load of TN discharged by the Permittee in a period of time. See Special Condition A. (3.), Calculation of TN Loads. a. TMF 8.34 b. b. i. c. ii. Town of Clayton NPDES No. NC0025453 A.(3.) CALCULATION OF TOTAL NITROGEN LOADS The Permittee shall calculate monthly and annual TN Loads as follows: i. Monthly TN Load (Ib/mo) = TN x TMF x 8.34 Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the Neuse River basin are annual limits and are applied for the calendar year. For any given calendar year, the Permittee shall be in compliance with the annual TN Load limit in this Permit if: the Permittee's annual TN Load is less than or equal to said limit, or ii. the Permittee is a Co-Permittee Member of a compliance association. The TN Load limit in this Permit (if any) may be modified as the result of allowable changes in the Permittee's TN allocation. i. Allowable changes include those resulting from purchase of TN allocation from the A.(4.) ANNUAL LIMITS FOR TOTAL NITROGEN a. ii. Annual TN Load (Ib/yr) = Sum of the 12 Monthly TN Loads for the calendar year The Permittee shall report monthly Total Nitrogen results (mg/L and Ib/mo) in the discharge monitoring report for that month and shall report each year's annual results (Ib/yr) in the December report for that year. = the average Total Nitrogen concentration (mg/L) of the composite samples collected during the month = the Total Monthly Flow of wastewater discharged during the month (MG/mo) = conversion factor, from (mg/L x MG) to pounds Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation between the Permittee and other dischargers; regionalization; and other transactions approved by the Division. The Permittee may request a modification of the TN Load limit in this Permit to reflect allowable changes in its TN allocation. Upon receipt of timely and proper application, the Division will modify the permit as appropriate and in accordance with state and federal program requirements. iii. Changes in TN limits become effective on January 1 of the year following permit where: TN modification. The Division must receive application no later than August 31 for changes proposed for the following calendar year. iv. Application shall be sent to: NCDWQ / NPDES Unit Attn: Neuse River Basin Coordinator Mail Service Center Raleigh, NC 27699-1617 d. i. ii. iii. e. A. (5.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 1.6 %. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the “North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,” Revised February 1998, or subsequent versions or “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple-concentration testing shall be performed at a minimum, in each of the two following months as described in “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of “detectable impairment,” collection methods, exposure regimes, and further statistical methods are specified in the “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Town of Clayton NPDES No. NC0025453 If the Permittee is a member and co-permittee of an approved compliance association, its TN discharge during that year is governed by that association's group NPDES permit and the TN limits therein. The Permittee shall be considered a Co-Permittee Member for any given calendar year in which it is identified as such in Appendix A of the association's group NPDES permit. Association roster(s) and members' TN allocations will be updated annually and in accordance with state and federal program requirements. If the Permittee intends to join or leave a compliance association, the Division must be notified of the proposed action in accordance with the procedures defined in the association's NPDES permit. (1) Upon receipt of timely and proper notification, the Division will modify the permit as appropriate and in accordance with state and federal program requirements. (2) Membership changes in a compliance association become effective on January 1 of the year following modification of the association's permit. The TN monitoring and reporting requirements in this Permit remain in effect until expiration of this Permit and are not affected by the Permittee's membership in a compliance association. Attention: North Carolina Division of Water Quality Environmental Sciences Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Town of Clayton NPDES No. NC0025453 A. (5.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) (cont’d.) Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must e measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aQuatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of “No Flow” in the comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re opened and modified to include alternate monitoring requirements or limits. NOTE- Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (6.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 2.0 %. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the “North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure, Revised February 1998, or subsequent versions or “North Carolina Phase II Chronic Whole EfflY^nt Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple-concentration testing shall be performed at a minimum, in each of the two following months as described in “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. 7 L Town of Clayton NPDES No. NC0025453 Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re­ opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shah constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. A. (6.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) (cont’d.) The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of “detectable impairment,” collection methods, exposure regimes, and further statistical methods are specified in the “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: North Carolina Division of Water Quality Environmental Sciences Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of “No Flow” in the comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. annual pollutant scan of its treated effluent for the following Bis (2-chloroethyl) ether Bis (2-chloroisopropyl) ether Bis (2-ethylhexyl) phthalate 4-bromophenyl phenyl ether Butyl benzyl phthalate 2-chloronaphthalene 4-chlorophenyl phenyl ether Chrysene Di-n-butyl phthalate Di-n-octyl phthalate Dibenzo(a,h)anthracene 1.2- dichlorobenzene 1.3- dichlorobenzene 1.4- dichlorobenzene 3.3- dichlorobenzidine Diethyl phthalate Dimethyl phthalate 2.4- dinitrotoluene 2,6-dinitrotoluene 1,2-diphenylhydrazine Fluoranthene Fluorene Hexachlorobenzene H exachlor obutadiene Hexachlorocyclo-pentadiene H exachlor oethane Indeno(l,2,3-cd)pyrene Isophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-nitrosodimethylamine N-nitrosodiphenylamine Phenanthrene Pyrene 1,2,4-trichlorobenzene Town of Clayton NPDES No. NC0025453 A. (7.) EFFLUENT POLLUTANT SCAN The permittee shall perform an ; \ " parameters: Ammonia (as N) Chlorine (total residual, TRC) Dissolved oxygen Nitrate/Nitrite Total Kjeldahl nitrogen Oil and grease Total Phosphorus Total dissolved solids Hardness Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Mercury Nickel Selenium Silver Thallium Zinc Cyanide Total phenolic compounds Volatile organic compounds: Acrolein Acrylonitrile Benzene Bromoform Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane 2-chloroethylvinyl ether Chloroform Dichlorobromomethane 1,1 -dichloroethane 1,2-dichloroethane Trans-1,2-dichloroethylene 1.1- dichloroethylene 1.2- dichloropropane 1.3- dichloropropylene Ethylbenzene Methyl bromide Methyl chloride Methylene chloride 1.1.2.2- tetrachloroethane Tetrachloroethylene Toluene 1,1,1 -trichloroethane 1.1.2- trichloroethane Trichloroethylene Vinyl chloride Acid-extractable compounds: P-chloro-m-creso 2-chlorophenol 2.4- dichlorophenol 2.4- dimethylphenol 4.6- dinitro-o-cresol 2.4- dinitrophenol 2-nitrophenol 4-nitrophenol Pentachlorophenol Phenol 2.4.6- trichlorophenol Base-neutral compounds: Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene Benzo(k)fluoranthene Bis (2-chloroethoxy) methane 1. The total set of samples analyzed during the current term of the permit must be representative of seasonal variations. 2. Samples shall be collected and analyzed in accordance with analytical methods approved under 40 CFR Part 136. 3. Unless indicated otherwise, metals must be analyzed and reported as total recoverable. 4. Test results shall be reported to the Division in DWQ Form- DMR-PPA1 or in a form approved by the Director, within 90 days of sampling. Two copies of the report shall be submitted along with the DMRs to the following address: Division of Water Quality, Water Quality Section, Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. 1 ACTION SUMMARY OF FACILITY AND WASTELOAD ALLOCATION The Division of Water Quality has made a tentative determination to modify the Little Creek WRF permit to increase its Total Nitrogen discharge limit. The increase reflects the Town’s purchase of nitrogen allocation from the South Granville Water and Sewer Authority. The Town’s current discharge TN allocation (and discharge limit) is 21,400 Ib/yr. The added 3,668 Ib/yr of estuary allocation is equivalent to 7,336 Ib/yr TN at the point of Clayton’s discharge (50% transport factor), bringing its discharge allocation to 28,736 Ib/yr. The Town has requested that its TN limit be increased to reflect its increased allocation. The Neuse River downstream of Clayton is free-flowing to the estuary, and the Division does not anticipate localized water quality impacts as the result of the increase in nitrogen discharge. Further, the transfer reduces the discharge allocation from 36,680 Ib/yr at Butner (10% Fact Sheet Amendment NPDES Permit Modification - Town of Clayton, Little Creek WRF, NC0025453 Page 1 DENR/DWQ AMENDED FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES No. NC0025453, Clayton/ Little Creek WRF The Neuse River Basin Nutrient Management Strategy rule for Wastewater Discharges (T15A NCAC 02B .0234) provides for the transfer of nitrogen allocation among permitted dischargers in the basin. On October 31, 2003, the NC Department of Health and Human Services (DHHS) purchased 6,113 Ib/yr of estuary Total Nitrogen (TN) allocation from the Bay River Metropolitan Sewer District for its Town of Bunter WWTP. The DHHS has since entered into an agreement with the South Granville Sewer and Water Authority (SGWSA), transferring operation of the Butner plant and control of its TN allocation to SGWSA. The Authority has elected to sell a portion of the allocation to fmance capital improvements at the plant. In April 2006, it offered 3,668 Ib/yr of its allocation to the highest bidder among the other members of the Neuse River Compliance Association. The Town of Clayton was the highest bidder and was awarded the sale. 303(d) Listed?: Subbasin:_________ Drainage Area (mi2): Summer 7Q10 (cfs) Winter 7Q10 (cfs): Average Flow (cfs): IWC (%):__________ Primary SIC Code: Receiving Stream: Stream Classification: Regional Office: Quad Permit Writer: Date: RRO__________ E25NW Clayton_______ Mike Templeton June 27,2006 Applicant / Facility Name: Applicant Address:_____ Facility Address:_______ Permitted Flow________ Type of Waste:_________ Facility/Permit Status: County: 1.6 4952 Facility Information_____________________ Town of Clayton/ Little Creek Water Reclamation Facility P.O. Box 879, Clayton, NC 27520____________________ Durham Street Extension____________________________ 1.9 MGD (expansion request to 2.5 MGD)______________ ~ 22% Ind., -78% Domestic (at permitted flow)_________ Renewal___________________________________________ Johnston__________________________________________ ________Miscellaneous Neuse River WS-IV NSW CA SI: 27-41.3 Yes__________ 030402_______ 1150_________ 186 (regulated) r PROPOSED SCHEDULE FOR PERMIT ISSUANCE The draft permit also includes a correction on its cover page, changing the previous reference to the Water Quality Commission to the Environmental Management Commission. Draft Permit to Public Notice: Permit Scheduled to Issue: transport factor) to 7,336 Ib/yr (50% TF), an 80% reduction in the allowable nitrogen discharge. The proposed increase in nitrogen limits would become effective on January 1, 2007, because the annual TN limit is applied on a calendar year basis. The increase is conditioned on the Town demonstrating that is has closed the purchase according to the Agreement of Purchase and Sale. July 7, 2006 August 21, 2006 Fact Sheet Amendment NPDES Pennit Modification - Town of Clayton, Little Creek WRF, NC0025453 Page 2 September 8, 2006 27520 Dear Mr. Biggs: Sincerely, Copies: NorthCarolinaNaturally Mr. Steve Biggs, Manager Town of Clayton P.O. Box 879 Clayton, North Carolina In our August 8 meeting here in Raleigh, you and James Warren further explained the Town of Clayton’s plans for nitrogen allocation recently purchased from the South Granville Water and Sewer Authority. You indicated that the Town has no need to increase its nitrogen limit at this time but will instead hold the added allocation in reserve for future flows, that is, flows beyond the 2.5 MGD now permitted. In light of this clarification, the Division has revised the draft permit modification. The new draft restores your nitrogen limit to its current value of 21,400 Ib/yr; and, at your request, includes one new Special Condition that identifies the Town's nitrogen allocations and the status of each. We are enclosing a copy of the revised draft permit for your review and comment. We are also distributing the package to all who have expressed an interest in the matter since we first published notice of the modification in July. Please provide any comments you have regarding the draft permit to this office, in writing, no later than September 22. If you have any questions concerning the draft permit, please contact me at (919) 733-5083, extension 541, or at mike.templeton@ncmail.net. Enclosure: Revised draft permit modification, NC0025453 Revised Fact Sheet Michael F. Easley, Governor State of North Carolina William G. Ross, Jr., Secretary Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality NPDES and Biosolids Permits Section, Region IV, EPA Raleigh Regional Office, Surface Water Protection Central Files NPDES Files Telephone (919) 733-7015 FAX (919) 733-0719 27604 On the Internet at http://h2o.enr.state.nc.us/ An Equal Opportunity/Affirmative Action Employer Subject: Revised Draft Permit Modification NPDES Permit NC0025453 Clayton - Little Creek WRF Johnston County 4?— I I Division of Water Quality, Point Source Branch 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 512 N. Salisbury Street, Raleigh, North Carolina | r- 1 — ■ X Templeton, P.E. Point Source Branch DRAFT, ver.2, 9/8/1 TOTAL NITROGEN ALLOCATIONS a. SOURCE DATE STATUS Estuary (Ib/yr)Discharge (Ib/yr) Base 10,700 21,400 Active Supplemental 3,668 7,336 In Reserve TOTAL 14,368 28,736 (Mixed) Footnote: (1) Transport Factor = 50% b. Issued March 11, 2003 Page Modified ALLOCATION TYPE Town of Clayton NPDES No. NC0025453 12/7/97; 4/1/03 7/5/06 Assigned by Rule (T15ANCAC 02B.0234) Purchased from South Granville WSA (Bay River MSD base) Any addition, deletion, or modification of the listed allocations (other than typographical errors) or any change in status of any of the listed allocations shall be considered a major modification of this permit and shall be subject to the public review process afforded such modifications under state and federal rules. A. (8.) The following table lists the Total Nitrogen (TN) allocations assigned to, acquired by, or transferred to the Permittee in accordance with the Neuse River nutrient management rule (T15A NCAC 02B .0234) and the status of each as of permit issuance. For compliance purposes, this table does not supercede any TN limit(s) established elsewhere in this permit or in the NPDES permit of a compliance association of which the Permittee is a Co-Permittee Member. ALLOCATION AMOUNT <1) Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days after the end of the reporting period for which the report is made. A. (6.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) (cont’d.) The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of “detectable impairment,” collection methods, exposure regimes, and further statistical methods are specified in the “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised- February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of “No Flow” in the comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re­ opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. Town of Clayton NPDES No. NC0025453 Attention: North Carolina Division of Water Quality Environmental Sciences Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 A. (7.) EFFLUENT POLLUTANT SCAN 1. 2. 3. Bis (2-chloroethyl) ether Bis (2-chloroisopropyl) ether Bis (2-ethylhexyl) phthalate 4-bromophenyl phenyl ether Butyl benzyl phthalate 2-chloronaphthalene 4-chlorophenyl phenyl ether Chrysene Di-n-butyl phthalate Di-n-octyl phthalate Dibenzo(a,h)anthracene 1.2- dichlorobenzene 1.3- dichlorobenzene 1.4- dichlorobenzene 3,3 - dichlor obenzidin e Diethyl phthalate Dimethyl phthalate 2.4- dinitrotoluene 2,6-dinitrotolu ene 1,2-diphenylhydr azine Fluoranthene Fluorene Hexachlorobenzene H exachlorobutadiene Hexachlorocyclo-pentadiene Hexachloroethane Indenof 1,2,3-cd)pyrene Isophorone Naphthalene Nitrobenzene N-nitrosodi-n-propylamine N-nitrosodimethylamine N-nitrosodiphenylamine Phenanthrene Pyrene 1,2,4 -trichlorobenzene Town of Clayton NPDES No. NC0025453 Ammonia (as N) Chlorine (total residual, TRC) Dissolved oxygen Nitrate/Nitrite Total Kjeldahl nitrogen Oil and grease Total Phosphorus Total dissolved solids Hardness Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Mercury Nickel Selenium Silver Thallium Zinc Cyanide Total phenolic compounds Volatile organic compounds: Acrolein Acrylonitrile Benzene Bromoform Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane 2-chloroethylvinyl ether Chloroform Dichlorobromomethane 1,1 -dichloroethane 1,2-dichloroethane Trans-1,2-dichloroethylene 1.1 -dichloroethylene 1.2- dichloropropane 1.3- dichloropropylene Ethylbenzene Methyl bromide Methyl chloride Methylene chloride 1.1.2.2- tetrachloroethane T etr achlor oethylene Toluene 1.1.1 -trichloroethane 1.1.2- trichloroethane Trichloroethylene Vinyl chloride Acid-extractable compounds: P-chloro-m-creso 2-chlorophenol 2.4- dichlorophenol 2.4- dimethylphenol 4.6- dinitro-o-cresol 2.4- dinitrophenol 2-nitrophenol 4-nitrophenol Pentachlorophenol Phenol 2.4.6- trichlorophenol Base-neutral compounds: Acenaphthene Acenaphthylene Anthracene Benzidine Benzo(a)anthracene Benzo(a)pyrene 3,4 benzofluoranthene Benzo(ghi)perylene Benzo(k)fluoranthene Bis (2-chloroethoxy) methane The permittee shall perform an annual pollutant scan of its treated effluent for the following parameters: The total set of samples analyzed during the current term of the permit must be representative of seasonal variations. Samples shall be collected and analyzed in accordance with analytical methods approved under 40 CFR Part 136. Unless indicated otherwise, metals must be analyzed and reported as total recoverable. 4. Test results shall be reported to the Division in DWQ Form- DMR-PPA1 or in a form approved by the Director, within 90 days of sampling. Two copies of the report shall be submitted along with the DMRs to the following address: Division of Water Quality, Water Quality Section, Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617. d. i. e. A. (5.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 1.6 %. The permit holder shall perform at a minimum, quarterlif monitoring using test procedures outlined in the “North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,” Revised February 1998, or subsequent versions or “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of “detectable impairment,” collection methods, exposure regimes, and further statistical methods are specified in the “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised- February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple-concentration testing shall be performed at a minimum, in each of the two following months as described in “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. Town of Clayton NPDES No. NC0025453 If the Permittee is a member and co-permittee of an approved compliance association, its TN discharge during that year is governed by that association's group NPDES permit and the TN limits therein. The Permittee shall be considered a Co-Permittee Member for any given calendar year in which it is identified as such in Appendix A of the association's group NPDES permit. ii. Association roster(s) and members' TN allocations will be updated annually and in accordance with state and federal program requirements. iii. If the Permittee intends to join or leave a compliance association, the Division must be notified of the proposed action in accordance with the procedures defined in the association's NPDES permit. (1) Upon receipt of timely and proper notification, the Division will modify the permit as appropriate and in accordance with state and federal program requirements. (2) Membership changes in a compliance association become effective on January 1 of the year following modification of the association's permit. The TN monitoring and reporting requirements in this Permit remain in effect until expiration of this Permit and are not affected by the Permittee's membership in a compliance association. Attention: North Carolina Division of Water Quality Environmental Sciences Branch 1621 Mail Service Center Raleigh, North Carolina 27699-1621 A. (5.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) (cont’d.) Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of “No Flow” in the comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re­ opened and modified to include alternate monitoring requirements or limits. A. (6.) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 2.0 %. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the “North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,” Revised February 1998, or subsequent versions or “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. The tests will be performed during the months of March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. Town of Clayton NPDES No. NC0025453 NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple-concentration testing shall be performed at a minimum, in each of the two following months as described in “North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure” (Revised-February 1998) or subsequent versions. Footnotes: 1. 2. 3.The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1. 4. 5. 6. 7. 8. 9. There shall be no discharge offloating solids or visible foam in other than trace amounts. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). Total residual chlorine is required only if chlorine is used as a disinfectant (or elsewhere in the process). TN means Total Nitrogen. For a given wastewater sample, TN is the sum of Total Kjeldahl Nitrogen and Nitrate-Nitrite Nitrogen: TN = TKN + NO2-N + NO3-N. TN Load is the mass load of TN discharged by the Permittee in a period of time. See Special Condition A.(3.), Calculation of TN Loads. The annual TN Load limit shall become effective with the calendar year beginning on January 1, 2003. Compliance with this limits shall be determined in accordance with Special Condition A.(4.), Annual Limits for Total Nitrogen. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar quarter (January-March, April-June, July-September, October- December). Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1700, D - Downstream at (1) NC Highway 42 and (2) NCSR 1908. Stream samples shall be grab samples and shall be collected 3/Week during June - September and 1/Week during the remaining months of the year. Instream monitoring is provisionally waived in light of the permittee’s participation in the Lower Neuse Basin Association. Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. Per 15A NCAC 2B .0505(c)(4), stream sampling (as well as influent/effluent sampling) may be discontinued when flow conditions could result in injury or death of the person(s) collecting the samples. In such cases, on each day that sampling is discontinued, written justification shall be specified in the monitoring report for the month in which the event occurred. Chronic Toxicity (Ceriodaphnia dubia) P/F at 1.6%: March, June, September, and December [see Special Condition A. (5)]. Toxicity monitoring shall coincide with metals monitoring. A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL (Continued) Town of Clayton NPDES No. NC0025453 10. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample. a. of the TMF 8.34 b. a. b. i. c. i. ii. Annual TN Load (Ib/yr) = Sum of the 12 Monthly TN Loads for the calendar year The Permittee shall report monthly Total Nitrogen results (mg/L and lb/mo) in the discharge monitoring report for that month and shall report each year's annual results (Ib/yr) in the December report for that year. Town of Clayton NPDES No. NC0025453 = the average Total Nitrogen concentration (mg/L) composite samples collected during the month = the Total Monthly Flow of wastewater discharged during the month (MG/mo) = conversion factor, from (mg/L x MG) to pounds where: TN the Permittee's annual TN Load is less than or equal to said limit, or ii. the Permittee is a Co-Permittee Member of a compliance association. The TN Load limit in this Permit (if any) may be modified as the result of allowable changes in the Permittee's TN allocation. Allowable changes include those resulting from purchase of TN allocation from the Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation between the Permittee and other dischargers; regionalization; and other transactions approved by the Division. ii. The Permittee may request a modification of the TN Load limit in this Permit to reflect allowable changes in its TN allocation. Upon receipt of timely and proper application, the Division will modify the permit as appropriate and in accordance with state and federal program requirements. iii. Changes in TN limits become effective on January 1 of the year following permit modification. The Division must receive application no later than August 31 for changes proposed for the following calendar year. iv. Application shall be sent to: NCDWQ / NPDES Unit Attn: Neuse River Basin Coordinator Mail Service Center Raleigh, NC 27699-1617 A.(4.) ANNUAL LIMITS FOR TOTAL NITROGEN Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the Neuse River basin are annual limits and are applied for the calendar year. For any given calendar year, the Permittee shall be in compliance with the annual TN Load limit in this Permit if: A.(3.) CALCULATION OF TOTAL NITROGEN LOADS The Permittee shall calculate monthly and annual TN Loads as follows: i. Monthly TN Load (Ib/mo) = TN x TMF x 8.34 Footnotes: 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1. 6. 9. There shall be no discharge offloating solids or visible foam in other than trace amounts. 10. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored daily at the effluent by grab sample. TN Load is the mass load of TN discharged by the Permittee in a period of time. See Special Condition A.(3.), Calculation of TN Loads. Per ISA NCAC 2B .0505(c)(4), stream sampling (as well as influent/effluent sampling) may be discontinued when flow conditions could result in injury or death of the person(s) collecting the samples. In such cases, ‘on each day that sampling is discontinued, written justification shall be specified in the monitoring report for the month in which the event occurred. Chronic Toxicity (Ceriodaphnia dubia) P/F at 1.6%: March, June, September, and December [see Special Condition A.(5)]. Toxicity monitoring shall coincide with metals monitoring. Town of Clayton NPDES No. NC0025453 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL (Continued) 7. The annual TN Load limit shall become effective with the calendar year beginning on January 1, 2003. Compliance with this limits shall be determined in accordance with Special Condition A.(4.), Annual Limits for Total Nitrogen. 1. Sample locations: E - Effluent, I - Influent, U - Upstream at NCSR 1700, D - Downstream at (1) NC Highway 42 and (2) NCSR 1908. Stream samples shall be grab samples and shall be collected 3/Week during June - September and 1 / Week during the remaining months of the year. Instream monitoring is provisionally waived in light of the permittee’s participation in the Lower Neuse Basin Association. Instream monitoring shall be conducted as stated in this permit should the permittee end its participation in the Association. 2. The monthly average effluent BODS and Total Suspended Residue concentrations shall not exceed 15% of the respective influent value (85% removal). 4. Total residual chlorine is required only if chlorine is used as a disinfectant (or elsewhere in the process). 5. TN means Total Nitrogen. For a given wastewater sample, TN is the sum of Total Kjeldahl Nitrogen and Nitrate-Nitrite Nitrogen: TN = TKN + NO2-N + NO3-N. 8. The quarterly average for total phosphorus shall be the average of composite samples collected weekly during the calendar quarter (January-March, April-June, July-September, October- December). EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Sample Type Flow 2.5 MGD Continuous Recording 5.0 mg/l 7.5 mg/l Daily Composite 10.0 mg/l 15.0 mg/l Daily Composite 30.0 mg/l 45.0 mg/l Daily Composite Dissolved Oxygen 3/Week Grab Fecal Coliform (geometric mean)200/100 ml 400/100 ml Daily Grab Fecal Coliform (geometric mean)3/Week Grab Total Residual Chlorine^28 pg/l Grab Effluent Effluent Effluent TN Load6 Temperature (°C)3/Week Grab Conductivity Daily Grab Conductivity 3/Week Grab Effluent 6-9 Effluent (Footnotes on next page) Measurement Frequency EFFLUENT CHARACTERISTICS Monthly Average Weekly Average Daily Maximum Calculated Calculated Sample Location^ Influent or Effluent Influent & Effluent Influent & Effluent Effluent Effluent A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL During the period beginning upon expansion above 1.9 MGD or expiration, the Permittee is authorized to discharge up to 2.5 MGD of municipal wastewater from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: Town of Clayton NPDES No. NC0025453 Monitor & Report Monitor & Report Monitor & Report Monitor & Report Monitor & Report 21,400 Ib/year (Annual Mass Loading)7 2.0 mg/L (Quarterly Average) 1.0 mg/l 2.0 mg/l 3.0 mg/l 6.0 mg/l Quarterly Monthly Monthly Monthly Daily Daily Weekly Weekly Weekly Monthly Monthly Annually Weekly Daily Daily Daily Daily Composite Grab Composite Composite Composite Composite Grab Composite Composite Grab Composite Composite Composite Calculated Effluent Effluent Upstream & Downstream Effluent Upstream & Downstream Upstream & Downstream Effluent Upstream & Downstream Influent & Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Silver TKN (mg/l)__________ NO2-N + NO3-N (mg/l) TN (mg/l)5 Total Monthly Flow (MG) BOD, 5 day (20°C)2 [April 1 - October 31] BOD, 5 day (20°C)2 [November 1 - March 31] NHaasN [April 1 - October 31] NH3 as N [Nov 1 - March 31] Dissolved Oxygen6 Chronic Toxicity6 Copper Zinc Total Suspended Residue2 Total Phosphorus 8 Temperature (°C) This page reserved for facility map. Town of Clayton NPDES No. NC0025453 EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Sample Type Flow 1.9 MGD Continuous Recording 5.0 mg/l 7.5 mg/l Daily Composite 10.0 mg/l 15.0 mg/l Daily Composite 30.0 mg/l 45.0 mg/l Daily Composite Dissolved Oxygen 3/Week Grab Fecal Coliform (geometric mean)200/100 ml 400/100 ml Daily Grab Fecal Coliform (geometric mean)3/Week Grab Total Residual Chlorine4 28 pg/l Grab Effluent Effluent Effluent TN Load6 Effluent Temperature (°C)3/Week Grab Conductivity Daily Grab Conductivity 3/Week Grab Effluent 6-9 Effluent (Footnotes on next page) EFFLUENT CHARACTERISTICS Monthly Average Weekly Average Daily Maximum Measurement Frequency Calculated Calculated Sample Location^ Influent or Effluent Influent & Effluent Influent & Effluent Effluent Effluent Town of Clayton NPDES No. NC0025453 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL During the period beginning on the effective date of the permit and lasting until expansion or expiration, the Permittee is authorized to discharge 1.9 MGD of municipal wastewater from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: Composite Grab 2.0 mg/l 4.0 mg/l Quarterly Monthly Monthly Monthly Daily Daily Weekly Weekly Weekly Monthly Monthly Annually Weekly Daily Daily Daily Daily Composite Composite Grab Composite Composite Composite Calculated Composite Composite Composite Composite Grab Upstream & Downstream Effluent Upstream & Downstream Effluent Upstream & Downstream Effluent Upstream & Downstream Influent & Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent Effluent BOD, 5 day (20°C)2 [April 1 - October 31] BOD, 5 day (20°C)2 [November 1 - March 31] Silver pH10 6.0 mg/l 12.0 mg/l TKN (mg/l) NO2-N + NOa-N (mg/l) TN (mg/l)5 Total Monthly Flow (MG) NH3 as N [April 1 - October 31] NHsasN [Nov 1-March 31] Dissolved Oxygen6 Total Suspended Residue2 Monitor & Report Monitor & Report Monitor & Report Monitor & Report Monitor & Report 21,400 Ib/year (Annual Mass Loading)^ 2.0 mg/L {Quarterly Average) Chronic Toxicity6 Copper Zinc Total Phosphorus 6 Temperature (°C) DRAFT, ver.2, 9/8/2^^~Permit No. NC0025453 PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM is hereby authorized to discharge wastewater from a facility located at to receiving waters designated as the Neuse River in the Neuse River Basin This permit shall become effective This permit and the authorization to discharge shall expire at midnight on March 31, 2008. Signed this day DRAFT Alan W. Klimek, P.E., Director Division of Water Quality By the Authority of the Environmental Management Commission Issued March 11, 2003 Modified In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Water Quality Commission, and the Federal Water Pollution Control Act, as amended, in accordance with the discharge limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof. STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY Town of Clayton Little Creek Water Reclamation Facility Little Creek Water Reclamation Facility On Durham Street Extension Clayton Johnston County Clayton WWTP NPDESNo. NC0025453 Permit No. NC0025453 SUPPLEMENT TO PERMIT COVER SHEET is hereby authorized to: 1. 2. 3.After receiving an Authorization to Operate from the Division of Water Quality, the Town may operate the facility to a maximum design flow of 2.5 MGD, and discharge to the point listed above. Discharge wastewater from said treatment works at the location specified on the attached map into the Neuse River, which is classified WS-IV NSW CA waters, in Neuse River Basin. Town of Clayton Little Creek Water Reclamation Facility Town of Clayton NPDES No. NC0025453 Continue to operate an existing 1.9 MGD wastewater treatment facility consisting of a mechanical bar screen, grit removal, parshall flume with flow measurement, primary clarifier/digester, trickling filter, dual oxidation ditches, dual secondary clarifiers, tertiary filters, ultraviolet disinfection, chlorine contact chamber, sulfur dioxide dechlorination, sludge thickener tank, aerobic sludge digester, and sludge drying beds located at the Little Creek Water Reclamation Facility, Durham Street Extension, Clayton, Johnston County, and r DRAFT ACTION SUMMARY OF FACILITY AND WASTELOAD ALLOCATION PERMIT ACTION The Division of Water Quality has made a tentative determination to modify the Little Creek WRF permit. The revised modification differs from the July 2006 draft permit in that it does not increase the Town’s Total Nitrogen discharge limit to reflect its purchase of allocation from the South Granville Water and Sewer Authority. Instead, it adds a Special Condition that identifies the Town’s allocations and notes that the new allocation is being held in reserve for future use. The Neuse River Basin Nutrient Management Strategy rule for Wastewater Discharges (T15A NCAC 02B .0234) provides for the transfer of nitrogen allocation among permitted dischargers in the basin. On October 31, 2003, the NC Department of Health and Human Services (DHHS) purchased 6,113 Ib/yr of estuary Total Nitrogen (TN) allocation from the Bay River Metropolitan Sewer District for its Town of Bunter WWTP. The DHHS has since entered into an agreement with the South Granville Sewer and Water Authority (SGWSA), transferring operation of the Butner plant and control of its TN allocation to SGWSA. The Authority elected to sell a portion of the allocation to finance capital improvements at the plant. In April 2006, it offered 3,668 Ib/yr of its allocation to the highest bidder among the other members of the Neuse River Compliance Association. The Town of Clayton was the highest bidder and was awarded the sale. Fact Sheet Amendment NPDES Permit Modification - Town of Clayton, Little Creek WRF, NC0025453 Page 1 DENR/DWQ AMENDED FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES No. NC0025453, Clayton/ Little Creek WRF Applicant/Facility Name: Applicant Address:______ Facility Address:________ Permitted Flow__________ Type of Waste:__________ Facility/Permit Status: County: Receiving Stream: Stream Classification: Regional Office: Quad Permit Writer: Date: RRO______________ E25NW Clayton___________ Mike Templeton September 8, 2006 1.6 4952 303(d) Listed?: Subbasin:__________ Drainage Area (mi2): Summer 7Q10 (cfs) Winter 7Q10 (cfs): Average Flow (cfs): IWC (%):___________ Primary SIC Code: Facility Information_____________________ Town of Clayton/ Little Creek Water Reclamation Facility P.O. Box 879, Clayton, NC 27520______________________ Durham Street Extension_______________________________ 1.9 MGD (expansion request to 2.5 MGD)_______________ ~ 22% Ind., -78% Domestic (at permitted flow)__________ Renewal________________________________________________ Johnston_______________________________________________ ________Misce llane ous Neuse River WS-IV NSW CA SI: 27-41.3 Yes___________ 030402_______ 1150__________ 186 (regulated) The current discharge TN allocation (and discharge limit) for the Town’s 2.5 MGD permitted flow is 21,400 Ib/yr. The Town’s original request was to increase its TN limit to 28,736 Ib/yr (21,400 + (3,668/50% transport)). The Division sent the draft permit to public notice with that SEP ' 3 2® 1 PROPOSED SCHEDULE FOR PERMIT ISSUANCE The revised draft permit includes a correction on its cover page, changing the previous reference to the Water Quality Commission to the Environmental Management Commission. change. It extended the comment period by two weeks when the Neuse Riverkeepers indicated they had not received a copy of the permit and were not aware of the proposal. In order activate the reserve allocation and increase its limit, the Town must seek and obtain approval through permit modification, in which case the proposed action must undergo the usual public review process. Draft Permit to Public Notice: Comment Period Extended to: Revised Draft Permit to Review: Comments Due: Permit Scheduled to Issue: September 8, 2006 September 22, 2006 Late September - Early October, 2006 July 7, 2006 August 21, 2006 During the initial public comment period, the Town clarified that it intends to hold the additional allocation in reserve for future flows, that is, permitted flows beyond 2.5 MGD, and so does not need the higher nitrogen limit at this time. It is confident it will meet its existing limit until flow increases require a plant expansion. As a result of this clarification, the revised draft permit restores the 21,400 Ib/yr nitrogen limit and instead lists the Town’s allocations and the status of each (active or reserved) in a new Special Condition. Fact Sheet Amendment NPDES Permit Modification - Town of Clayton, Little Creek WRF, NC0025453 Page 2