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Home My WebLink AboutNC0020231_SPECULATIVE LIMITS_19900727NPDES DOCUWENT SCAMMIMS COVER SHEET NPDES Permit: NC0020231 Louisburg WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Data Monitoring Report Speculative Limits Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: July 27, 1990 This document is printed on reuse paper -- 4pxo a s►ng content on tla►e reV-erse side lIM TS ir-A(ii,(Ty 'Ex c 1.5 AA • r r f.� EA me G.0 1 f r t i t y✓ f T! ni I 16 3 equest No.: 5697 ------------------- WASTELOAD ALLOCATION APPROVAL FORM ------------------- Facility Name: NPDES No.: Type of Waste: Status: Receiving Stream: Classification: Subbasin: County: Regional Office: Requestor: Date of Request: Quad: Louisburg WWTP NCO0202031 94% Domestic/6% Existing/Modif Tar River WS-III, NSW 030301 Franklin RRO Jule Shanklin 4/13/90 C25SE Industrial 1986 Drainage area: 437.0 sq mi Summer 7Q10: 14,:=00 cfs Winter 7Q10 : '4'8_ 00 -, cfs Average flow: 46S,,00'''c'fs 30Q2: ' ! 2 c£s -------------------- RECOMMENDED EFFLUENT LIMITS ------------------------- EXISTING PROPOSED summer winter Wasteflow (mgd) : 0.80 1.50 BOD5 (mg/1) : 30 10 /26 NH3N (mg/1): 3 /4 DO (mg/1) : 5 5 TSS (mg/1) : 30 30 Fecal coliform (#/100ml): 1000 200 pH (su) : 6-9 6-9 t PAILq Phosphorous (mg/1): 2 Total Nitrogen (mg/1) : 4 /8 Chlorine (mg/1) : 0.028 Oil & Grease (mg/1) : 30(moAl0k) (oD"P-AR�N'*-A-0 Toxicity Testing Req.: Chronic Q P/F: 14% ---------------------------- MONITORING ---------------------------------- Parameters: D.O., temperature, Fecal coli, conductivity Upstream (Y/N): Y Location: at least 100 ft upstream Downstream (YIN): Y Location: approximately 5.7 miles downstream of discharge. ----------------------------- COMMENTS ----------------------------------- Louisburg WWTP is expanding from 0.8 MGD to 1.5 MGD. Compliance data indicates no problems at current limits. However, chlorine may be a problem so facility should implement dechlorination with modification. See the attached graph for the various BOD5 and corresponding NH3 limits available to the facility. The Tar River is classified as NSW so a phosphorous limit and total nitrogen limit will apply. rRe-i"ArA&wr 02"n.)G¢AW�' MA" t Rs ,WAWC+ ro WLA Ra+h wR I.1 n� Recommended by: �,.a, , / , Date: & t S/jd Reviewed by � 1 Teec�cch�h Support Supervisor: Date: (,0 1S qD Regional Supervisor: �, w Date: _i/,2djy Permits & Engineering: ,' P- Date: 7 Z7 go RETURN TO TECHNICAL SUPPORT BY: JUL 311990 C+�}r,, e.,f R,I, LL—,,rr_.. Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Govemor William W. Cobey, Jr., Secretary August 1, 1990 Mr. Michael S. Acquesta, P.E. Peirson and Whitman, Inc. P.O. Box 52099 Raleigh, NC 27612 Subject: Town of Louisburg NPDES No. NCO020231 Franklin County Dear Mr. Acquesta: George T. Everett, Ph.D. Director The Technical Support Branch of the Division of Environmental Management (DEM) has received your correspondence, dated May 4, 1990, requesting speculative permit limits should the Town of Louisburg (NPDES No. NCO020231) choose to increase its effluent discharge from 0.8 MGD to 1.5 MGD. Departmental requirements effective July 27, 1989, state that any expansion greater than 0.5 MGD requires the preparation of an Environmental Assessment (EA) or an Environmental Impact Statement (EIS) before the NPDES permit modification request is processed. Therefore, this stipulation would have to be met should the Town choose to expand to 1.5 MGD. The Town of Louisburg's discharge point into the Tar River is characterized by 1986 U.S. Geological Survey (USGS) flow estimates and are as follows: drainage area = 437.0 square miles average floe- = 41600 cubic feet per Second SUI--ne."!. Q10 = ' .0 cubic fect per second winter 7Q10 = 48.0 cubic feet per second Using these flows and current modeling techniques, the following limits for the Louisburg Wastewater Treatment Plant were determined: Polludon Prevention Pays Raj-isr, , Norm raroiin Z7-5ii-7687 T•eie:inone 919-733-7015 PARAMETER EFFLUENT LIMITATION Monthly Average Summr;r Winter Flow (MGD) 1.50 1.50 BODS (mg/l) 10 26 NH3-N (mg/1) 3 4 DO (mg/1) 5 5 TSS (mg/1) 30 30 Fecal coliform (#/100m1) 200 200 pH 6-9 daily max 6-9 Phosphorous (mg/1) * 2 2 Total Nitrogen (mg/1) * 4 8 Chlorine (µg/1) 28 daily max 28 Oil & Grease (mg/1) 30 . 30 (60 mg/1 daily max) Toxicity Testing Requirement: Chronic quarterly P/F at 14% (the facility is required to perform the North Carolina Chronic Pass/Fail test at an effluent concentration of 14%, which is the instream waste concentration, on a quarterly basis). Instream monitoring of D.O., temperature, Fecal coliform, and conductivity will be required. Effluent monitoring of Lead will also be required. * based on quarterly average of weekly samples The Tar River is classified as a nutrient sensitive water (NSW), Therefore, a phosphorous limit and total nitrogen limit were applied. The facility should implement chlorination/dechlorination or another means of disinfection upon expansion. These effluent limitations were developed only for your use in the engineering study for expansion of the treatment works. Effluent limitations can only be made final upon review of an official NPDES permit application and issuance of an NPDES permit. Please call me at (919) 733-5083 if you have any questions regarding this matter. Sincerely, ; J.;T'revor Clements, Assistant Chief W a?er Quality Sec. or. - JTC:saw cc: Don Safrit Tim Donnelly Central Files I .�. yam,; May 4, 1990 A 0 CAS Mr. Trevor Clemments Water Quality Section PERSON N N.C. Division of Environmental Management P.O. Box 27687 AND Raleigh, North Carolina 27611-7687 WHITMAN Re: speculative Discharge Limits Louisburg ME? INC. P&W Project No. 0806 Dear Mr. Clenments: ARCHITECTS The T wn of Louisburg is on the 1990 Contingency Funding List for an EPA loan. As part of the requirements for obtaining this loan, I am ENGINEERS in the pis of preparing a 201 Facilities Plan. In order to properly plan the wastewater treatment facilities, I am hereby PLANNERS requesting Speculative NPDES Discharge Limits for a 1.5 MOD plant on the Tar River in Louisburg, at the site of the existing plant. Your timely issuance of these limits would be greatly appreciated. ESTABLISHED 1938 Very truly yam► PEIRSON & WHI'"A++fP,N, INC. 0o ting Eng' eers Michael S. Acquesta, E. 5510 MUNFORD ROAD MSA/la P. O. BOX cc: Tcwn of Louisburg 52099 Arthur Mouber'y, P.E., Raleigh Regional Office PHONE 919/782-8300 FAX P 949/783-7642 F'- TWX 5109280511 MAY 4 7 1990 RALEIGH N.C. 27612 U.S.A. shy Cr+crr S, 7�rsz C54r r a rG vJ C LkV 5U l fq UM (TS21 E 90 T/�c Y 'zvicL By uLC-D Cso�� NOD Or- w(AlrOF 11 57 _ F w�NrG,e- Cflovs� 3LL: M t NN7 'Ile _ IurgRC�1�lr�o�C,� 7Qra� -14-u- o-LA.3c:�ll�f,�� ! Paa os P_An1 ScoN So �tM �7 4 o-z5- OfAND DEG�[o�lnl/}�� Tq,e PAni 4I CO B/i�N �r�u��Y N�r±1 % G'.�P�NDLG � y D. 5 MGD ,ypk_L. CrorR�� — IW C, - /¢. Z % C4e. Q Pl R%1_ Z° d�CT��-1* WINTER BOD5=26, NH3-N=4, D.Q.=5 WINTER ----------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ---------------------------------------------------------------------- The End D.O. is 8.88 mg/1. The End CBOD is 2.40 mg/l. The End NBOD is 0.85 mg/l. ---------------------------------------------------------------------- WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) ---------------------- ---- (mg/1) ---- (mg/1) -- (mgd) ---------- Segment 1 8.88 7.90 4 Reach 1 26.00 4.00 5.00 1.50000 Reach 2 0.00 0.00 0.00 0.00000 Reach 3 0.00 0.00 0.00 0.00000 Reach 4 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER Summer 7Q10 : 14.0 Design Temperature: 14.0 Subbasin : 030301 Stream Class: WS-III Winter 7Q10 : 48.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/mil fps I ft Idesignl @204 Idesignl @204 Idesignl Segment 1 I I 1 0.801 I 1.481 0.307 I 1 3.31 I I 1 0.16 1 0.21 I . I 1 0.35 1 I- 0.401 I 0.19 1 Reach ------------------------------------------------------------------------------------ 1 1 1 1 1 1 1 1 1 I 1 Segment 1 I I 1 1.901 I 1.481 0.309 I 1 3.33 l I 1 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 0.311 I 1 3.35 I I l 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach ---------------------------------------___---------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 .1.301 I 1.481 0.309 I 1 3.36 l I 1 0.16 1 0.21 I I 1 0.35 1 l 0.401 I 0.19 1 Reach ---------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD 1 D.O. I I cfs I mg/1 I mg/1 1 mg/1 Segment 1 Reach 1 Waste 1 2.325 1 26.000 1 4.000 1 5.000 Headwatersl 48.000 1 2.000 1 1.000 1 9.280 Tributary 1 0.000 1 2.000 1 1.000 1 9.280 * Runoff 1 0.000 1 2.000 1 1.000 1 9.280 Segment 1 Reach 2 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 1.100 1 2.000 1 1.000 1 9.280 * Runoff 1 0.000 1 2.000 1 1.000 1 9.280 Segment 1 Reach 3 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.920 1 2.000 1 1.000 1 9.280 * Runoff 1 0.000 l 2.000 1 1.000 1 9.280 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.150 1 2.000 1 1.000 1 9.280 * Runoff 1 0.000 1 2.000 1 1.000 1 9.280 SUMMER CBOD=01 SUMMER ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ---------------------------------------------------------------------- The End D.O. is 5.28 mg/l. The End CBOD is 0.65 mg/l. The End NBOD is 0.74 mg/l. ---------------------------------------------------------------------- DO Min (mg/1) Milepoint Reach # Segment 1 5.06 5.10 3 Reach 1 Reach 2 Reach 3 Reach 4 WLA WLA WLA CBOD NBOD DO Waste Flow (mg/1) (mg/1) (mg/1) (mgd) 0.00 24.00 5.00 1.50000 0.00 0.00 0.00 0.00000 0.00 0.00 0.00 0.00000 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER Summer 7Q10 : 14.0 Design Temperature: 26.0 Subbasin : 030301 Stream Class: WS-III Winter 7Q10 : 48.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/mil fps I ft Idesignl @2046 Idesigni @20;6 Idesignl Segment 1 I I 1 0.801 I 1.481 0.132 I 1 2.87 I I 1 0.27 1 0.20 I I 1 0.29 I I 0.251 I 0.48 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I 1 1 1.901 I 1.481 0.132 I 1 2.89 I I 1 0.27 1 0.20 I . I 1 0.29 1 I 0.251 I 0.48 1 Reach --------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I 1 1 3.901 I 1.481 0.133 I 1 2.91 I I 10.27 1 0.20 I I 1 0.29 1 I 0.261 I 0.48 1 Reach -----------------------------------------------------------•-----------__----------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.301 I 1.481 0.132 I 1 2.92 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach -------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD I D.O. I I cfs I mg/l I mg/l I mg/l I Segment 1 Reach 1 Waste 1 2.325 1 0.000 1 24.000 1 5.000 Headwatersl 14.000 1 2.000 1 1.000 1 7.300 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 I 1.000 1 7.300 Segment 1 Reach 2 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.200 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 3 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary I 0.300 1 2.000 1 1.000 1 7.300 * Runoff I 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.000 1 2.000 I 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 SUMMER NBOD=O, SUMMER ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ---------------------------------------------------------------------- The End D.O. is 5.06 mg/l. The End CBOD is 2.41 mg/l. The End -------------------------------------------------------------------_--- NBOD is 0.15 mg/l. WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) --- (mgd) Segment 1 ------ 5.00 --------- 6.30 ------- ---- 3 ---- ----------- Reach 1 34.00 0.00 5.00 1.50000 Reach 2 0.00 0.00 0.00 0.00000 Reach 3 0.00 0.00 0.00 0.00000 Reach 4 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** • Discharger : LOUISBURG WWTP Subbasin 030301 Receiving Stream : TAR RIVER Stream Class: WS-III Summer 7Q10 : 14.0 Winter 7Q10 : 48.0 Design Temperature: 26.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/mil fps I ft Idesignl @20% ldesignl @20% Idesignl Segment 1 1 I 1 0.801 I 1.481 I 0.132 1 2.87 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach ---------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.901 I 1.481 I 0.132 1 2.89 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 I 0.133 1 2.91 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.261 I 0.48 1 Reach --------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 . I I I Segment 1 I I 1 1.301 ! 1.481 I 0.132 1 2.92 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach --------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD I D.O. I I cfs I mg/1 I mg/1 I mg/l I Segment 1 Reach 1 Waste 1 2.325 1 34.000 1 0.000 1 5.000 Headwatersl 14.000 1 2.000 1 1.000 1 7.300 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 2 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary 0.200 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 3 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.300 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 4 Waste 1 0.000 I 0.000 1 0.000 1 0.000 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300