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HomeMy WebLinkAboutNC0046426_Wasteload Allocation_19901031State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Governor George T. Everett, Ph.D. William W. Cobey, Jr., Secretary Director October 31, 1990 Frank C. Cockinos & Associates, Inc. 600 Lexington Avenue Charlotte, NC 28203 Subject: Wilkes County Schools Permit Nos. NC0046418,and NC0046426. Wilkes County Schools Dear Mr. Cockinos: The Technical Support Branch has completed its assessment of the remaining Wilkes County Schools, Mt. View and Traphill Elementary Schools. Mt. View Elementary should receive secondary limits if the discharge is relocated to either "Site 1" on Hay Meadow Creek or "Site 2" on the unnamed tributary of Mulberry Creek. Hay Meadow Creek will provide greater dilution. Traphill Elementary should receive secondary limits if the discharge is relocated to Little Sandy Creek at SR 1002 which is your "Site 2". In summary, Mt. View and Traphill schools should be relocated as suggested above. Roaring River Elementary School should be relocated to the Yadkin River below Roaring River. Miller Creek Elementary should be upgraded to meet its existing limits for the Reddies River site. Prior to any relocation of a discharge point, a permit modification must be obtained. The above limits are speculative and are for use in an engineering review of discharge alternatives. If you have any questions regarding the above recommendations, please call me at (919) 733-5083, Ext. 516. Sincerely, Betsy on cc: David Russell, Winston-Salem Regional Office Pollution Prevention Pays P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer l •Dyn\ es .r� �'\ i 1 /,- �, 269 S u l I ,/r\ a Y.4 it 11 l J \1. )1 BM 131 901 O 3Q1 `, -»h efeoe tlol C�m 2200' r^1 f3/6 I • II i• t lr • . )9. V. • • f• • • * *C7 ko . _ • .v•--..„--......,5 ..,. .. ..„.„. •_....:. ......,. \ •:...-- ..-----. •.-0*--aF'7,0,..---, ..; ....,,\J $-..v.,, ---).•-•%;.-‘ ' ,---.--=-7- -••• ... ,.; -.7.-•. •—• 4\- (/ •••••••• • ••••••••••'. 2▪ r . • . • ... f, .....' • ..ar . . . 1.... o. .. . ‘'5 .. ................: .\, •k ,::. . ..,....., \ .‘1,,,,,..‘...., ..../.. a \'‘%..', I /P60 ; • II. cp-. 0 ......,.. r .:.--. -- -------_,. , • " 0 il ,• , ,...--:. —., _..„.. ........ _....• --.....„,_ • _.„-•• ,-•-,. --:-.---. , --....-.....„ --." ,...„......-- .\-1,_ 13/Q. It - •%! -...-:^) ". -'' ' 7 ° a c • ,11/%'• • •.*.1•V-1. %,e• Fairplains te. 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WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) Segment 1 7.39 0.00 1 Reach 1 45.00 90.00 0.00 0.00400 Reach 2 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger : TRAPHILL ELEM SCHOOL Subbasin : 030701 Receiving Stream : LITTLE SANDY CREEK Stream Class: C Summer 7Q10 : 0.84 Winter 7Q10 : 1.3 Design Temperature: 25.0 ILENGTHI SLOPE' VELOCITY 1 DEPTH' Kd 1 Kd 1 Ka 1 Ka 1 KN I 1 mile I ft/mil fps 1 ft Idesign l @204 Idesign l @2024 Idesign' 1 1 1 1 1 1 1 I I Segment 1 1 0.301 47.001 0.221 1 0.51 1 0.57 1 0.45 120.86 1 18.711 0.73 Reach 1 1 1 I 1 1 I 1 1 I 1 1 1 1 1 1 1 1 I Segment 1 I 1.101133.001 0.323 1 0.46 10.78 10.62 155.75 1 50.001 0.73 Reach 2 1 1 1 1 I I 1 1 I I Flow I CBOD 1 NBOD 1 D.O. I I cfs I mg/1 1 mg/1 I mg/1 I Segment 1 Reach 1 Waste I 0.006 1 45.000 1 90.000 1 0.000 Headwaters) 0.840 I 2.000 1 1.000 I 7.440 Tributary I 0.000 1 2.000 i 1.000 1 7.440 * Runoff I 0.070 1 2.000 I 1.000 I 7.440 Segment 1 Reach 2 Waste I 0.000 1 0.000 I 0.000 I 0.000 Tributary I 0.120 1 2.000 I 1.000 I 7.440 * Runoff I 0.070 1 2.000 1 1.000 1 7.440 * Runoff flow is in cfs/mile ma c SUMMER I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 1 1 0.00 7.39 2.32 1.65 0.85 1 1 0.05 7.57 2.30 1.63 0.85 1 1 0.10 7.72 2.28 1.61 0.85 1 1 0.15 7.82 2.26 1.59 0.86 1 1 0.20 7.90 2.24 1.58 0.86 1 1 0.25 7.96 2.22 1.56 0.86 1 1 0.30 8.01 2.20 1.54 0.87 1 2 0.30 7.94 2.18 1.47 0.99 1 2 0.40 8.11 2.14 1.45 0.99 1 2 0.50 8.18 2.11 1.43 1.00 1 2 0.60 8.20 2.08 1.41 1.01 1 2 0.70 8.21 2.05 1.38 1.02 1 2 0.80 8.21 2.02 1.36 1.02 1 2 0.90 8.21 1.99 1.34 1.03 1 2 1.00 8.21 1.96 1.32 1.04 1 2 1.10 8.21 1.93 1.30 1.04 1 2 1.20 8.21 1.90 1.28 1.05 1 2 1.30 8.21 1.88 1.26 1.06 1 2 1.40 8.21 1.85 1.24 1.06 I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I DIVISION OF ENVIRONMENTAL MANAGEMENT September 24, 1990 TO: Dale Overcash Permits and Engineering FROM: Betsy_Johnson Technical Su orrnt THROUGH: Carla SandersonCA Trevor Clements SUBJECT: Revision of Wilkes County Schools' Permits. NPDES Permit Nos. NC00046396, NC0046426, NC0046418. Wilkes County NPDES Permits were recently reissued for three Wilkes County schools: C.B. Eller Elementary School, Traphill Elementary School, and Mt. View Elementary School. The first two permits (C.B. Eller, and Traphill) each contained chronic toxicity testing requirements for ammonia toxicity. However, no toxicity tests were recommended by Technical Support (see attached Wasteload Allocation forms). Please drop the toxicity testing requirements from the above referenced permits. Mt. View Elementary does not discharge to its permitted site. In 1980, the school received secondary limits in exchange for rerouting the discharge below the pond at the headwaters of Mulberry Creek. The discharge was not relocated as requested. The County now plans to relocate the discharge as part of the SOC. As the SOC supercedes the NPDES permit until 1994, no changes in the existing permit are - necessary. A permit modification to allow for a new discharge site is expected before 1994. cc: David Russell, WSRO Central Files Superintendent Marsh D. Lyall Associate Superintendent Dr. Linda H. Greene Assistant Superintendents K. Wayne Barker C. Eugene Reavis (+7 f)' WILKLS COUNTY SCHOOLS 1461,6. September 7, 1990 ii r.� 201 West Main Street Wilkesboro, North Carolina 28697 919-667-1121 919-838-5021 (FAX) Mr. Dale 0vercash NPDES Permits Group Department of Environment, Health and Natural Resources Division of Environmental Management P.O. Box 27687 Raleigh, NC 27611-7687 RE: NPDES Permit Draft I NC0046426 Traphill Elementary School Mr. 0vercash, Board Chairman Dr. Fay C. Byrd Board Vice Chairman Gene Jones, Jr. C.W. Barker John T. Phillips Ralph T. Steele 1 - Ly U 1 Ar RP4I rC' . •11VCrgtA/r By this letter the Wilkes County Board of Education is requesting a change in the draft permit for the above referenced facility. I believe the quarterly chronic toxicity parameter should be omitted from the final permit. This parameter is only to be monitored for a portion of the permits effective dates. The final year of the permit requires that ammonia nitrogen (NH3) concentration be reduced to 1 mg/1. Whether or not our effluent would be considered toxic by this analysis, our ultimate goal would be to reduce NH3 to the final limit of 1 mg/1. Based on estimated cost of the chronic toxicity analysis, if this facility could not pass this analysis the Board of Education could be paying out $7500 during the next three years for lab analysis. The results of the toxicity analysis would mean little to us since our concen- tration would already be directed toward meeting the final effluent limit of 1 mg/l. 1 V r Another fact to be considered in making this request is that this school is operating under a special order by consent agreement (SOC) (EMC WQ No. 89-74). The SOC calls for compliance or cease discharge by December 31, 1992. Preliminary engineering studies have already begun and we foresee no-fproblems in meeting this deadline. In summary I see no valid reason for conducting the chronic toxicity analysis since we are already heavily committed in resolving this situation. I have discussed this matter with David Russell of the Winston-Salem Regional Office and he has indicated to me that he is in agreement with this request. Sincerely, Keith Lenderman Operator in Responsible Charge KL/jth cc: WSRO David Russell State of North Carolina Department of Environment, Health, and Natural Resources Winston-Salem Regional Office James G. Martin, Governor Margaret Plemmons Fo . er William W. Cobey, Jr., Secretary Regional Mana r DIVISION OF ENVIRONMENTAL) MANAGEMENT l August 14, 1990 Mr. H. L. Moorefield, Jr. Frank C. Cockinos & Associates, Inc. 600 Lexington Avenue Charlotte, NC 28203 tt,;;;J 7 1990 1 Subject: Wasteloads for Wilkes County Schools County: Wilkes Dear Mr. Moorefield: This letter is to acknowledge receipt of your letter dated August 2, 1990, requesting wasteload information for Wilkes County Schools. Your request has been forwarded to Raleigh for assistance in this matter. You will be advised of the results. If you have any questions, contact our office. Sincerely, i David Russell Environmental Specialist cc: "Trevor Clements Central Files WSRO 8025 North Point Boulevard, Suite 100, Winston-Salem, N.C. 27106.3203 • Telephone 919-761-2351 An Equal Opportunity Affirmative Action Employer State of North Carolina Department of Environment, Health, and Natural Resources Winston-Salem Regional Office James G. Martin, Governor Margaret Plemmons Foster William W. Cobey, Jr., Secretary Regional Manager DIVISION OF ENVIRONMENTAL MANAGEMENT August 14, 1990 MEMORANDUM TO: Carla Sanderson Technical Support Supervisor THROUGH: St=ev >Mauney Water Quality Supervisor FROM: David Russell Environmental Specialist, WSRO SUBJECT: Request for Wasteloads for Wilkes County Schools Wilkes County Find attached a letter from a consultant working with the Wilkes County Schools. The consultant is requesting wasteloads for the potential relocation of discharge points. All four (4) of the schools are covered in a recently issued SOC. The consultant needs to know the required limits at a potential discharge point in order to make a determination of the cost effective method to achieve compliance either by continuing to discharge or constructing a non -discharge disposal system. Information is needed only for potential discharge points for Traphill Elementary and Mount View Elementary. The proposed discharge into the Yadkin River for Roaring River Elementary would receive 30-30 limits. Likewise, Miller's Creek Elementary has received 30-30 limits at the school's existing discharge point. 8025 North Point Boulevard, Suite 100, Winston-Salem, N.C. 27106-3203 • Telephone 919-761-2351 An Equal Opportunity r. nrmative Action Employer 2 Please calculate the limits for Traphill and Mount View. For Traphill, start with point number 1, should that location receive 30-30 limits, do not calculate the other two points. All locations at the junction of two (2) streams should have the discharge just downstream of the junction. The flow for Mount View is 0.01 mgd and 0.0045 for Roaring River Elementary. Your help in this matter would be appreciated. If you need additional information, please call. DR/dh Attachment t t FRANK C. COCKINOS & ASSOCIATES, INC. CONSULTING ENGINEERS 600 LEXINGTON AVENUE (704) 372-4464 CHARLOTTE, N.C. 28203 August 2, 1990 North Carolina Department of Environment Health and Natural Resources 8025 North Point Boulevard Winston-Salem, North Carolina 27106 Attention: Mr. David Russell Reference: Wilkes County Schools Dear David: RECEIVED N.C. Dept. NRCD AUG 6 1990 Winston-Salem Regional Office Attached please find four (4) U.S.G.S. prints locating schools which may have the discharge points relocated. Please inform our office of the viability of the relocated discharge points shown and the wasteload allocations associated with them. The schools are as follows: 1. Millers Creek Elementary School - Two (2) points selected, see Wilkesboro Quadrangle. 2. Mountain View Elementary School - Two (2) points selected, see Wilkesboro Quadrangle. 3. Traphill Elementry School - Three (3) points selected, see Traphill Quadrangle. 4. Roaring River Elementary School - One (1) point selected, see Roaring River Quadrangle. Since these schools are under a S.O.C. a timely response would be appreciated. Should you have any questions, please do not hesitate to contact our office. Very truly yours, FRANK C. COCKINOS & ASSOCIATES, INC. H. L. Moorefield, Jr., P.E. HLM,Jr./hc Attachments cc: Mr. KEith Lenderman • •r. •494(G4A 0 YA.4;14 .„r- ilt; ,,' ,r.i. S-;i;%,-• ( .:1'''', i ,?1.q‘ 2'3.O" ,....,. Fs;ik.,:--1;g77.' qvggr,tpotyKrra,-vvrapl- -v--mr-,-----7,44 1 44,,.,4-.,A!),I. -:,.,,....t9r. 7,,:o.,,,f,,,,;.t.:.,q,..x; vir l , T.,. :(' TRAPHILL QUA .ANdLE. .,14„• NORTH CAROLINA .. 7.5. MINUTE SERIES (TOPOORAPHI6: '''" ky ..1:7,7;..y. I. -...-,ty.• ,,,•-\.,,0 .. 1V1ii\tu 499 1 410 000- FEET • 81 *00' 3E -96C EE 4.•,),. • It r ,f 1.4 ." r„ .• 4°24 z -4-oz 7102 z 2( DAFT REQUEST NPDES WASTE LOAD ALLOCATION PERMIT NO.: NC0046426 PERMITTEE NAME: Wilkes County Schools / Traphill Elementary Facility Status: Existing Permit Status: Renewal Major Minor '1 Pipe No.: 001 Design Capacity: 0.004 MGD Domestic (% of Flow): 100 % Industrial (% of Flow): Comments: RECEIVING STREAM: an unnamed tributary to Little Sandy Creek Class: C Sub -Basin: 03-07-01 Reference USGS Quad: County: Wilkes Regional Office: Winston-Salem Regional Office Previous Exp. Date: 1/31/91 Treatment Plant Class: Classification changes within three miles: No change within three miles. Requested by: Mack Wiggins Prepared by: Reviewed by: (di&' /K thA 2€ 0 BG0 J S / kv s�w Sa,S L36- v /ZS B 14SE (please attach) 1 Modeler Date Rec. # C is 5-(`,b(.10 5-104 Drainage k (mi2 ) , o S Avg. Streamflow (cfs):. 0"7 7Q10 (cfs) b Winter 7Q10 (cfs) O 30Q2 (cfs) O Toxicity Limits: IWC % Acute/Chronic Instream Monitoring: parameters— l e Onkt (' b ? c 1-c Cc� Cbl 1- rw Upstream -7 Location -CD Vcci- „ fisirpa.,,,,.. Downstream -/ Location 1bDO. ot- pawnE Caw.. ST Effluent Characteristics - - t +e--'-. . sur,,,,i r- ',,An4-e.,. s401314.4-0/- ,,,A,d-C,. BOD5 (mg/1) P 0 3e ,j ' 10 NH3-N (mg/1) / 3 n�e,u / 1, ? D.O. (mg/1) (P 6, 4- TSS (mg/1) 33 3o 3o 3 0 F. Col. (/100 ml) a 0 O aop a pCj d flo pH (SU) 6 - 5 -9 (, - 4, -1 Chlug,.e. ,UaE- &3/1 Zero flow policy: Recommend removal of discharge. Renew with above limits for 3 years. Facility must submit an engineering proposal within 12 months evaluating alternatives to discharge. If no feasible alternatives, limits will change after 3 years to 5(10) and 1(1.8) for BOD5 and NH3-N (summer/winter). Instream monitoring may be dropped after facility agrees, in writing, to a schedule for removal. Facility will receive letter addressing chlorine toxicity. Date: 5T7/90 Date: 7/a 3/9 0 Date: 4)45.___L /72-4 0 Comments: rict,r' FLU N.C. G;,,;c. NRCO JUN 2 6 1990 Winston-Salem Request No.: Regional Office WASTELOAD ALLOCATION APPROVAL F6RM Facility Name: NPDES No.: Type of Waste: Status: Receiving Stream: Classification: Subbasin: County: Regional Office: Requestor: Date of Request: Quad: Wasteflow (mgd) : BOD5 (mg/1) : NH3N (mg/1) : DO (mg/1) : TSS (mg/1) : Fecal coliform (#/100m1): pH (su) : Traphill Elementary NC0046426 Domestic Existing/Renewal UT to Little Sandy C 30701 Wilkes Winston-Salem Mack Wiggins B14SE 0.007936 School 5704 JUL 1 7 199 , Creek PERMITS & ENGIN.EURiN!; Drainage area: 0.050 sq mi Summer 7Q10: 0.00 cfs Winter 7Q10: 0.00 cfs Average flow: 0.07 cfs 30Q2: 0.00 cfs RECOMMENDED EFFLUENT LIMITS EXISTING summer winter 0.004 0.004 20 30 13 monitor 6 6 30 30 1000 1000 6-9 6-9 PROPOSED summer 0.004 20 13 6 30 200 6-9 winter 0.004 30 monitor 6 30 200 6-9 Toxicity Testing Req.: -Chronic quart_ etly—at-9-90 a'p //z s`qa - per ammonia toxicity procedure MONITORING Upstream (Y/N): Y Location:50 feet upstream Downstream (Y/N): Y Location:1000 feet downstream PARAMETERS: DO, Cond, Temp, Fecal Coliform COMMENTS Numerous violations. Zero flow policy: Recommend removal of discharge. Renew with above limits for 3 years. Facility must submit an engineering proposal within 12 months evaluating alternatives to discharge. If no feasible alternatives, limits will change after 3 years to 5(10) and 1(1.8) for BOD5 and NH3-N (summer/winter). Instream monitoring may be dropped after facility agrees, in writing, to a schedule for removal. Facility will receive letter addressing chlorine toxicity. Recommended by: Reviewed by Instream Assessment: Regional Supervisor: Permits & Engineering: RETURN TO TECHNICAL SUPPORT BY: (Arvs-J5 SOL AA04-46-1 /14 00)-7L.ia,autio, Date: („// 37?c.) Date: £/16ici Date: Date: JUL 18 1990 tA 8/89 Facility Name T ki tAtmtv.kuni Zakoo I Permit # NU) b4IL, a (o CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY) The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests, using test procedures outlined in: 1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay Procedure - Revised *June 1988) or subsequent versions. The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality is '1 % (defined as treatment two in the North C rolina procedure document). The permit holder shall perform quarterly monitoring using this procedure to establish compliance with the permit condition. The first test will be performed after thirty days from issuance of this permit during the months of J1.W , s EP I l)E C 1N11�2 . Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Environmental Management P.O. Box 27687 Raleigh, N.C. 27611 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 any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, 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 Environmental Management indicate potential impacts to the receivint 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 and appropriate environmental controls, shall constitute an invalid test and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute noncompliance with monitoring requirements. 7Q10 cfs Permited low • D0'i MGD Recommended by: IWC% /o 0 Basin & Sub -basin v 3 —07-- Receiving Stream LET &ndy Ge,r t /' County W' (i{es Date lL 3' fc) **Chronic Toxicity (Ceriodaphnia) P/F at 9? %, MARidSi F, bE+~See Part 3 , Condition r! . T*11;11_ Ek.me,t‘ry Sdho./EJ nicithe,ou.5 effice6,21 . rss A416 - de -AP" 11 ?2/10 /Is g/,5 1 hSif-eav,,--• v:-YNO A-Ktftipvit- -hp 4c5±- 1 er0 Hoi c* 6 1: icts ,444.-ts -Fp,- 3 y eats 14fAte, (Rec. revv1,0 V6,-( 5v6‘4.:4- eik5 . e -,-takitts US G S c.01._tiai.Jors- 71)A :OA eiY7 BoDs-- 3Dm3it 'Ta03 Ch 67-) dic 'MS 3 C., PTQkb ( • 03) -El 1\11-flA 13 -scom. DLO e (p kz_s- 77A) 6-- Li/12/7-5 5 ,....cvv% .kcctL _IODLL boo 1 Sk INSTREAM SELF -MONITORING DATA MONTHLY AVERAGES Discharger: --Irraft.JAI E1ew4• ZdtotA Permit No.: NC00'LifeLia(0 Receiving Stream: UT i..;t}{e Satidti C ta< Sub -basin: 0 3 -67-01 Upstream Location: ? Downstream Location 2 Upstream DATE TEMP D.O. DEC-90 P C-eld 4c NOV-90 OCT-90 SEP-90 AUG-90 JUL-90 JUN-90 MAY-90 APR-90 lb-3 (o.S-- 75- MAR- 9 0 _f`� l G• S 9 5 FEB-90 _ _ /p.Lf ( ,S5 Y0 JAN-90 ( l0. (o 30 DEC-89 /D" jr ( . 5 NOV-89 y�f G a C> OCT-89 ,3 _r_Ze_ 25. 4,0 SEP-89 F? a`( AUG-89 L hIs 6-& JUL-89 JUN-89 MAY-89 13 APR-89 /0 iv• (P-5- Soo MAR-89 FEB-89 JAN-89 DEC-88 NOV-88 OCT-88 SEP-88 AUG-88 JUL-88 JUN-88 MAY-88 APR-88 MAR-88 FEB-88 JAN-88 DEC-87 NOV-87 OCT-87 SEP-87 AUG-87 JUL-87 JUN-87 MAY-87 APR-87 MAR-87 FEB-87 JAN-87 Downstream TEMP D.O. - P u -E cAc. L 1 lv ( - 5- l0 10_S 67. S 1 Zo Cv 1(. Z E.T OS /a, , G.s __ - 13 9,r 6. 3— 75- / 1 e"• ? 1. S 3/5- (ao-o lv 10.9 G.5 lcroo 7 State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Governor Wiliam W. Coney, Jr., Secretary June 19, 1990 George.T. Everett, Ph.D. Director Keith Lenderman Traphill Elementary School/Wilkes County Board of Education 201 W. Main Street Wilkesboro, NC 28697 Subject: Chlorine Toxicity NPDES Permit No. NC0046426 Wilkes County Dear Mr. Lenderman: Chlorine, a widely used wastewater disinfectant for the treatment of coliform organisms, often remains instream in residual amounts that may prove to be toxic under critical low stream flow conditions. In the last decade, EPA assessed the potential adverse effects of chlorine to the aquatic environment and has taken steps to reduce the impacts through the development of federal criteria. In 1986, EPA recommended that all states have a chlorine standard by their next triennial review of water quality standards. In revising its water quality standards in 1989, North Carolina developed an action level for chlorine of 17 ug/1 (freshwater classes only). In addition, the fecal coliform limit was reduced from 1000 colonies/100 ml to 200 colonies/ 100 mi. Under a new DEM procedure, dechiorination and chlorine limits are now recommended for all new or expanding dischargers proposing the use of chlorine for effluent disinfection. The Division is reviewing chlorine levels from all existing dischargers as part of their NPDES permit renewal process. Our records indicate that chlorine from your. facility's effluent discharge is considered toxic to the receiving stream under low flow conditions, i.e., the amount of chlorine discharged causes a violation of the instream action level for chlorine (17 ug/1) under 7Q10 conditions (the lowest average daily flow for seven (7) consecutive days during a ten (10) year period). Action should be taken to reduce the effluent concentration of chlorine to an acceptable level. Based on your facility's instream waste concentration of 100%, an acceptable level of chlorine in your effluent is 17 ug/1 or 0.017 mg/l. If this level is not feasible, you should consider dechiorination or alternate methods of disinfection for your facility to ensure that both chlorine and bacterial limits are met. In addition, if your facility plans to undertake any phase of construction, dechiorination or alternate disinfection should be included. However, please note that an authorization to construct must be obtained from this Division prior to any alteration to your treatment plant. Poludon Prevendon Pays P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone 919-733-7015 An r.,,,.I (lnr,nrn.nih, Afi'irmahi,, ANinn FmnInvi r -2- The Division is currently reviewing its water quality regulations pertaining to chlorine. In the future, effluent limits and/or dechlorination may be required of existing facility's with chlorine problems. If the chlorine levels in your facility's effluent remain unchanged, a chlorine limit or a whole effluent toxicity testing requirement may be added to your permit limitations. Please feel free to call Steve Mauney of the Division's Regional Office at (919) 761-2351, if you have any questions or comments regarding this issue. Sincerely, calt--- Steve Tedder Water Quality Section Chief SWT/eaj cc: Winston-Salem Regional Office Central Files