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Home My WebLink AboutNC0036269_Permit Modification_20100316AVA NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Governor Director Dee Freeman Secretary March 16, 2010 Mr. Evander Rowell, P.E. Engineering Director WSACC P.O. Box 428 Concord, NC 28026-0428 Subject: Permit Modification for Interim Flow NPDES Permit NC0036269 WSACC Rocky River WWTP Cabarrus County Dear Mr. Rowell: Division staff have received and approved your request for an interim flow effluent sheet for 26.5 MGD. This facility currently has phased effluent limits for 24 MGD and 34 MGD. In order to activate the 26.5 MGD interim flow, the facility must receive approval from DWQ Construction Grants and Loans for a facility rerate to this interim flow. If this rerate is not approved, the facility will remain at 24 MGD with approved future expansion to 34 MGD upon receipt of Authorization to Construct/Engineer's Certification. Attached please find modified permit sheets. For the new Interim 26.5 MGD Effluent Sheet, CBOD and NH3-N limits were based on freezing mass load at 24 MGD. For the modified 34 MGD Effluent Sheet, the NH3-N limits were updated (1.4 mg/1 summer, 2.9 mg/1 winter) to reflect current requirements; this will aid in planning/design for the future expansion. For the modified Chronic Toxicity Permit Limit Sheet, the effluent test concentration of 62% was added for the Interim 26.5 MGD flow. This permit modification is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 . =hone; 919-807-6300 ?. FAX: 919-807-6492 \ Customer Service: 1-877-623-6748 Internet: www.ncwaterquafity.org An Equal Opportunity ' Affirmative Action Employer North Carolina Naturally which may be required by the Division of Water Quality or permits required by the Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may be required. If you have any questions on this permit modification, please contact me at 919-807-6390. Sincerely, giuckt.tkp Cc: NPDES Permit File Central Files MRO, Surface Water Protection Aquatic Toxicology Unit Construction Grants & Loans, Seth Robertson US EPA, Marshall Hyatt 1617"Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807-6300 t FAX; 919-807-6492 \ Customer Service: 1-877-623-6748 Internet: www.ncwaterquality.org An Equal Opportunity +. Affirmative Action Employer om Belnick Supervisor, Western NPDES Program One NorthCaroli.na Natural/ Permit NC0036269 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation- or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. The Water and Sewer Authority of Cabarrus County is hereby authorized to: 1. to continue operating a 24 MGD wastewater treatment facility consisting of: • influent bar Screens; • an influent pump station; • four (4) primary clarifiers; • grit removal system; - • . first stage aeration (pure oxygen); • four (4) intermediate clarifiers; - • second stage aeration (pure oxygen); • four (4) final clarifiers; • chlorine disinfection (sodium hypochlorite); • pure oxygen generator; • sludge disposal by pumping to two gravity -flow sludge thickeners; • sludge conditioning (polymer addition); • two (2) Centrifuges; • sludge incinerator; • two (2) sludge -ash settling basins; • alkalinity addition; • odor control system; • RAS automative flow .controls; • plant automation control system; • . one (1) standby power generator; located at the Rocky River Regional Wastewater Treatment Plant, off NCSR 2343 (on Breezy Lane, southeast of Concord), Cabarrus County; and 2. After receiving rerate approval from 24 MGD. to 26.5 MGD from DWQ Construction Grants and Loans, operate at 26.5 MGD. 3. After receiving an Authorization to Construct from DWQ Construction Grants and Loans, construct and operate additional facilities needed to expand the facility to 34 MGD; and 4. Discharge from said treatment system via Outfall 001 (see attached- map) into the Rocky River, a stream classified as C waters within the Yadkin -Pee D•ee River Basin. Permit NC0036269 A. (2) _ EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [26.5 MGD] During the period`beginning with receipt of DWQ Rerate Approval to 26.5 MGD and lasting until expansion to 34 MGD or permit expiration, the Permittee is authorized to discharge -from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: _ PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average. ' . Weekly Average Daily Average Measurement Frequency. Sample Type Sample ;Location' Flow 26.5 MGD Continuous Recording Influent or Effluent . CBOD, 5 day, 20°C Summer (April 1 - October 31)2 15.4 mg/L 23.1 mg/L Daily Composite Influent & Effluent CBOD, 5 day, 20°C Winter (November 1 - March 31) 2 - - 22.6 mg/L . '33.9 mg/L Daily 'Composite Influent,& . Effluent Total Suspended Solids (TSS) 2 30.0 mg/L 45.0 mg/L Daily. Composite Influent & Effluent NH3 as N Summer _ (April-1-, October 31) 3.6 mg/L 10.8 mg/L Daily Composite Effluent NH3 as N -Winter (November 1- March 31) 9.0 mg/L 27.0 mg/L Daily Composite Effluent Dissolved Oxygen . Daily average > 6.0 mg/L Daily Grab Effluent Total Residual Chlorine3 - 27 pg/L Daily - Grab Effluent Fecal Coliform (geometric mean) 200 / 100 mL _ 400 / 100 mL Daily Grab Effluent : - Total Nitrogen - (NO2 + NO3 + TKN) - Monthly • - Composite Effluent Total Phosphorus _ Monthly Composite - Effluent Chronic Toxicity4 0 Quarterly Composite - Effluent Temperature, °C _ Daily Grab Effluent pH > 6.0 and < 9.0 standard units Daily Grab Effluent Temperature, °C5 Variable 6 - Grab U, D Conductivity5 • Variable 6 Grab U, D Dissolved Oxygen5 Variable 6 Grab U, D Fecal Coliform (geometric mean) 5 Variable 6 Grab U, D Table Footnotes: 1. - U: Upstream at NCSR 1132; Di: Downstream at U.S. Highway 601; D2: Downstream at NCSR 1006. 2. Monthly average effluent values for Carbonaceous Biochemical Oxygen Demand (CBOD5) and TSS shall not exceed. _ 15% of the respective influent values (i.e. 85% removal). . 3. Total Residual Chlorine (TRC). The facility shall report all effluent TRC values reported_by a NC certified laboratory including field certified. However, effluent values below 50 ug/L will be treated as zero for compliance -purposes. 4 Chronic Toxicity (Ceriodaphn a) at 62:0%: sample quarterly during February, May, August, and November [see A. (4)]. 5. Monitoring upstream (U) and downstream (Di and D2) are provisionally waived, based on membership in the Yadkin — Pee Dee River Basin Association. If at any time during the term of this permit, membership is terminated, the Permittee shall notify the Division immediately, and immediately conduct iristream monitoring as stipulated in this permit: - 6. Variable Frequency — The Permittee shall collect instream samples three times per week (3/week) during the months of June, July, August, and September; and once per week (1/ week) during April, May, and October only. Effluent shall contain no floating solids or foam -visible in other than trace amounts. Permit NC0036269 A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [34.0 MGD] During the period beginning with the receipt of an Engineer's Certification of Completion for expansion to 34 MGD, and lasting until permit expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER LIMITS MONITORING REQUIREMENTS . Monthly Average Weekly Average . Daily Average Measurement Frequency Sample Type Sample Location1 Flow 34.0 MGD - Continuous Recording Influent or Effluent CBOD, 5 day, 20°C Summer (April 1 - October 31)2 10.0 mg/L 25.0 mg/L Daily Composite - Influent & Effluent CBOD, 5 day, 20°C Winter -(November 1 - March 31) 2 . 20.0 mg/L - 35.0 mg/L - .- • - Daily Composite . Influent & Effluent Total Suspended Solids (TSS) 2 30.0 mg/L 45.0 mg/L Daily Composite Influent & Effluent NH3 as N Summer - - (April 1— October 31) _ 1.4 m_ g/L - - 4.2 mg/L Daily . Composite -.. Effluent NH3 as N Winter (November 1 --March 31) 2.9 mg/L - 8.7 mg/L Daily Composite Effluent Dissolved Oxygen Daily average > 6.0 mg/L Daily Grab Effluent Total Residual Chlorine3 25 pg/L Daily - Grab - - - Effluent Fecal Coliform (geometric mean) 200 / 100 mL 400 / 100 mL Daily Grab Effluent Total Nitrogen (NO2+NO3 +TKN) Monthly Composite Effluent Total Phosphorus Monthly Composite Effluent Chronic Toxicity4 Quarterly Composite Effluent Temperature, °C Daily Grab Effluent pH > 6.0 and <9.0 standard units Daily Grab Effluent Temperature, °C5 Variable 6 Grab U, D Conductivity5 Variable 6 Grab U, D Dissolved Oxygen5 Variable 6 Grab U, D Fecal Coliform (geometric mean) 5 Variable 6 Grab U, D Table Footnotes: 1. U: Upstream at NCSR 1132; D,: Downstream at U.S. Highway 601; D2: Downstream at NCSR 1006. 2. Monthly average effluent values for Carbonaceous Biochemical Oxygen Demand (CBOD5) and TSS shall not exceed 15%-of the respective influent values (i.e. 85% removal). 3. Total Residual Chlorine (TRC). The facility shall report all effluent TRC values reported by a NC certified laboratory including field certified. However, effluent values below 50 ug/L will be treated as zero -for compliance purposes 4. Chronic Toxicity (Ceriodaphnia) at 67.7%: sample quarterly during February, May, August, and November [see A. (4)] • - 5. Monitoring upstream (U) and downstream (D, and D2) are provisionally waived, based on membership in the Yadkin — Pee Dee River Basin Association. If at any time during the term of this permit, membership is terminated, the Permittee shall notify the Division immediately, and immediately conduct instream monitoring as stipulated in this pemut. 6. Variable Frequency — The Permittee shall collect instreamsamples three times per week (3/week) during the summer months of June, July, August, and September; and once per week (1/ week) during the months of April, May, and October only. Effluent shall contain no floating solids or foam visible in other than trace amounts. Permit NC0036269 A. (4) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) The permittee shall conduct chronic toxicity tests using test procedures outlined in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -November 1995) or subsequent versions. The effluent concentration defined as the Instream Waste Concentration (IWC) shall be at the following flow -dependant effluent concentrations: 59.6% (24 MGD); 62.0% (26.5 MGD); and 67.7% (34 MGD). The chronic value 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 presence of 48 hour acute toxicity will be determined using Fisher's Exact Test at 48 hours from test initiation. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are described by the document referenced above. The permit holder shall perform at a minimum, quarterly monitoring using these procedures to establish compliance with the permit condition. The tests will be performed during the months of February, May, August, and November. 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. 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 THP3B for the Chronic Value and TGA3B for the 48 hour Acute Toxicity measure (Pass/Fail). Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: NC DENR / DWQ / Environmental Sciences Section 4401 Reedy Creek Road Raleigh, NC 27607 Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in association with the toxicity tests, as well as all dose/response data. 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, then monthly monitoring will begin immediately until such time that a valid test is submitted. Upon submission of a valid- test, this monthly test requirement will revert to quarterly in the months specified above. 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. If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be included in the calculation reporting of the data submitted on the DI R & all AT Forms submitted. 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. WSACC,<et4Jr (� w a I WATER & SEWER AUTHORITY OF CABARRUS COUNTY March 8, 2010 Ai Zy 40 2 b.E i) AIPOF) 44-4 fleipew I owe 2)C(r -L. revfrevi rearte Mr. Tom Belnick Supervisor, NPDES Point Source Branch Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina 27699-1617 SUBJECT: Water & Sewer Authority of Cabarrus County (WSACC) - NPDES Permit No. NC 0036269, "Effluent Limitations/Monitoring Requirements Page Request" for 26.5 mgd Discharge Flow Dear Mr. Belnick: Office: 232 Davidson Hwy. Concord, NC 28027 Mail to: P.O. Box 428 Concord, NC 28026-0428 Phone: 704.786.1783 Fax: 704.795.1564 As you are aware through a recent conversation with Mike Parker, WSACC is in the process of making a formal request to DWQ for a capacity re -rating of its Rocky River Regional WWTP. WSACC has completed the necessary documentation to support this re -rating request, and recently presented this information to the Mooresville Office DWQ representatives. As a result of this meeting, Mike Parker agreed to contact you concerning the proper procedure for having our re -rating request processed/reviewed. Mike relayed to me that you thought it would be best for WSACC to first request an additional "Effluent Limitations and Monitoring Requirements Page" for the re -rating flow of 26.5 mgd from your office. Upon obtaining the additional limitations page, WSACC could then submit this along with the necessary supporting documentation for the re -rating directly to the Construction Grants and Loan Section for their technical review. This would ensure Construction Grants and Loans had all of the necessary information to complete the review. Therefore, it is requested that WSACC be provided with an additional "Effluent Limitations and Monitoring Requirements" page for a discharge flow condition of 26.5 mgd. Our existing permit already has a limitations page for 24.0 mgd and a 34.0 mgd. Mike also noted that you did not think that obtaining the additional limitations page would trigger any type of major permit modification requirement, since this would just be an additional limitations page between the limitations pages already included in the permit. If you need any additional information relative to this request, please let me know. Your help and assistance in regard to this re -rating effort is greatly appreciated. Sincerely, g;x'/ mod' Evander H. Rowell, P.E. Engineering Director EHR: j ss cc: Ray Furr Jim Struve — Hazen & Sawyer Mike Parker — DWQ/Mooresville MAR 102010 DENR-WATER QUALI"iY POINT SOURCE BRANCH iW..S4CC 7:42gektALt nOrDn26g 7/5/ 20/o faCi 11'6 ea 20Y /hea,J6j Roy 6M,.7 ;(eve44- v- 14 ' i►r►%� .266.s ii/IrO Z Y 11161i Z6.s- 4i6-6 CQc14s, M14 17 Fr-e Load S : (i-4-:-14 x 17 = I V M C3 �,1 ple___ , ZS Pm2-1La14. ( 1 x 7.rs - L2.13 oi'r1 , , of ---A fii-3 ._41 y keel.?�: ( ) 6Y -- 3-Litt(),q N�(��,, �A Io fie' t : ( ) x 1a = q 0 Alt, i 0K 6 AN, T unit wLT — ,�o% s ,, r , _ _ _ _ _ - r'-G Nil) 3YiY0 u_iiD GILA- G i cje rAl r'Ji.a//_ l J 1 Whole Effluent Toxicity Testing Self -Monitoring Summary March 15, 2010 FACILITY RI:01 IkI'All :\'I YEAR JAN FEB MAR .APR MAY JUN JUL AUG SEP OCT NOV DEC • Comm Scope Inc./002 24hr LC50 ac monit epis fthd NC0034754/002 Begin 7/1/2007 Frequency: Q I/calendarQ County: Catawba Region: MRO Subbasin: CTB32 PF, var .Spcelal 7Q10: 0.05 IWC(%) na urJer Fthd24Ac 2006 — NonComp: 2007 — 2008 — 2009 — 2010 — — H H — H — — H H — H — H — H -- H — H — — H — — H — H -- H — H — H Comm Scope Inc./003 • 24hr LC50 ac nronit epis fthd NC0034754/003 Begin 7/1/2007 Frequency Q 1/calendarQ County: Catawba Region: MRO Subbasin CTB32 PF: var SIx'c'al 7Q10: 0.0 IWC(%) na order Fthd24Ac 2006 — — H — -- H -- -- H — H NonComp: 2007 — — H — -- H — — H -- H 2008 — — H — -- H — — H -- — H 2009 — — H — -- H -- — H -- — H 2010 — Comm Scope Inc./004 24 hr LCSO ac mono epis fthd Fthd24Ac 2006 — H — -- H H -- H NC0034754/004 Begin 7/1/2007 Frequency: Q 1/calendar Q NonComp: 2007 — — H — — H — — H — H County: Catawba Region: MRO Subbasin: CTB32 2008 — — H — — H — — H — -- -- PF, var Special 2009 — — H — — H — — H — — H 7Q10: 0.0 IWC(%) na Order 2010 — Concord Rocky River WWTP chr lim: 59.6%(till 24 MGD; if 34MGD chr lim 6 Cer7dChV ¥ 2006 — >100,>100(P) -- >100>100(P) — — 50.6>100(P) >100 >100 >100>100(P) — NC0036269/001 Begin 1 I/I/2008 Frequency: Q Feb May Aug Nov + NonComp:Single 2007 — >100 -- -- >100 — — >100 — -- >100 — Counry: Cabarnis Region: MRO Subbasin YAD12 2008 — >100 --- -- 86.6 — — >100 — — >100 PE- 24.0 Spveial 2009 — 86.6 --- -- 86.6 — — >100 -- >100 7010, 25.2 IWC(%) 59.62 (ndcr 2010 — Conoco Philips 24hr P/F ac lim: 90% NC0084697'00 I Begin 1 / 1 /2005 Frequency Q + Jan Apr Jul Oct County' Edgeconsbe Region RRO Subbasin: TARO? PF spiral 7Q10: 36.4 IWC(%) oohs Fthd24PF 2006 Pass — — Pass — — Pass -- -- Pass + NonComp:Single 2007 Pass — — Pass — — Pass -- Fail,Pass 2008 Pass — H — — 4 -- -- Pass 2009 pass -- — Pass — — Pass — Pass 2010 Pass Conover NE WWTP chr lim: 32% NC0024252/001 Begin 9/1/2005 Frequency: Q Mar Jun Sep Dec County: Catawba Region: MRO Subbasin: CTB32 PF: 1.5 sp.-ei:J 7Q10: 5.0 1WC(%) 32.0 orJ>r Ceri7dPF ¥ 2006 — — Pass — Pass — — Pass -- -- Pass * NonComp. Single 2007 — — Pass — — Pass — — Pass -- Pass 2008 — — Pass — — Pass — — Pass — -- Pass 2009 — — Pass,>64(P) — — Pass,>64(P) — — Pass,>64(P) -- -- Pass 2010 — Conover SE WWTP chr line 48% Ceri7dPF 2006 H — — H — — H — — H N00024279/001 Begin 8/1/2005 Frequency. Q Jan Apr Jul Oct * NonComp:Single 2007 H — — H — — H — — H County: Catawba Region: MRO Subbasin: CTB32 2008 H H — H — H PF: 0,30 Sp.eml 2009 H -- -- H — — H — -- H 7Q10: 0.5 IWC(au) 48 Order 2010 H Contentnea MSD WWTP chr km 11% N00032077/00I Begin 3/1/2010 Frequency' Q Jan Apr Jul Oct County: Pitt Region: WARO Subbasin: NEU07 PF: 2.85 special 7Q10: 0.0 IWC(%) 100 Order. Ceri7dPF ¥ 2006 Pass — -- Pass -- — Pass — -- Pass + NonComp:Single 2007 Pass -- -- Pass -- — Pass — -- Pass 2008 Pass — -- Pass -- — Pass — -- Pass 2009 Pass -- -- Fail >44 >44 Pass>44(P) >44(P)t -- Pass 2010 Pass Cookson GW Demarkation System Chr Lim: 90% NC0088081/00I Begin 10/1/2005 Frequency: Q Jan Apr Jul Oct County: Anson Region: FRO Subbasin: YADIO PF: 0.10 Special 7Q10: NA IWC(%) 100 OrJer Ceri7dPF 2006 NR/Pass + NonComp: 2007 Fail >100 2008 Pass — 2009 pass — 2010 Pass -- Late NR Pass Pass -- -- Pass >100 Pass -- — Pass -- -- Pass Pass -- — Pass -- -- Pass -- Pass -- — Pass -- -- Pass Cooleemee WWTP-Town of Mocksville CHR LIM: 2.1% NC0024872/001 Begin 8/1/2009 Frequency: Q Jan Apr Jul Oct County: Davie Region WSRO Subbasin: YAD06 PF: 1.5 7Q10: 106 IWC(%) 2.1 ord.•r Ceri7dPF ¥ 2006 Pass — — Pass — Pass -- Pass + NonComp:SINGLE 2007 Pass Pass -- — Pass -- -- Pass 2008 Pass — Pass,>8.4(P) -- Pass>8.4(P) Pass,>8.4(P) — >8.4(P),Pass Pass 2009 pass — — Pass -- — Pass — — Pass 2010 Pass Cornerstone Carillon. LLC Chr Lim: 90% Ceri7dPF 2006 >100 >100 Pass — — Pass — — Pass — Pass NC0085731/001 Begin 7/1/2005 Frequency: Q Mar Jun Sep Dec + NonComp: 2007 — — Pass — -- Pass — — Pass -- -- Pass County: Mecklenburg Region: MRO Subbasin CTB34 2006 — — Pass — -- Pass — — Pass -- Pass PF: 0.0316 Special 2009 — -- Pass -- -- Pass -- Pass -- -- Pass 7Q10: 0 IWC(%) 100 order. 2010 — ¥ Pre 2006 Data Available LEGEND: PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement Begin = First month required 7Q I 0 = Receiving stream low flow criterion (cfs) += quarterly monitoring increases to monthly upon failure or NR Months that testing must occur - ex. Jan, Apr, Jul, Oct NonComp = Current Compliance Requirement PF = Permined Bow (MGD) I WC% = Instream waste concentration P/F = Pass/Fail test AC = Acute CHR = Chronic Data Notation: f - Fathead Minnow; * • Ceriodaphnia sp.; my - Mysid shnmp; ChV • Chronic value; P - Mortality of stated percentage at highest concentration; at - Performed by DWQ Aquatic Tox Unit; bt - Bad test Reporting Notation: --- = Data not required; NR - Not reported Facility Activity Status: 1 • Inactive, N - Newly Issued(To construct): H - Active but not discharging; t-More data available for month in question; = ORC signature needed 12 Re611,A M430 3yrift Facility: WSACC NC0036269 Prepared By: Tom Belnick Enter Design Flow (MGD): Enter s7Q10 (cfs): Enter w7Q10 (cfs): Total Residual Chlorine (TRC) Daily Maximum Limit (ug/l) s7Q10 (CFS) DESIGN FLOW (MGD) DESIGN FLOW (CFS) STREAM STD (UG/L) Upstream Bkgd (ug/I) IWC (%) Allowable Conc. (ug/I) Fecal Coliform Monthly Average Limit: (If DF >331; Monitor) (If DF<331; Limit) Dilution Factor (DF) IWC Calculations 25.2 34 52.7 17.0 0 67.65 25 Ammonia (Summer) Monthly Average Limit (mg NH3-N/I) s7Q10 (CFS) DESIGN FLOW (MGD) DESIGN FLOW (CFS) STREAM STD (MG/L) Upstream Bkgd (mg/I) IWC (%) Allowable Conc. (mg/I) Ammonia (Winter) Monthly Average Limit (mg NH3-N/I) w7Q10 (CFS) 200/100m1 DESIGN FLOW (MGD) DESIGN FLOW (CFS) STREAM STD (MG/L) 1.48 Upstream Bkgd (mg/I) IWC (%) Allowable Conc. (mg/I) Total Residual Chlorine 1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Ammonia (as NH3-N) 1. If Allowable Conc > 35 mg/I, Monitor Only 2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I 3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I 4. Lower treatment cap for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter) 5. Lower treatment cap for Major Municipals: 1 mg/I (year-round) 25.2 34 52.7 1.0 0.22 35.2 34 52.7 1.8 0.22 Fecal Coliform 1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni) NPDES Server/Current Versions/WLA; TB 1/16/2009