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Home My WebLink AboutNC0030210_Wasteload Allocation_19940701WDES DOCYNEW1' SCANNIM6 COVER SNEE'1' NPDES Permit: NC0030210 Charlotte / Mallard Creek WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Staff Comments Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: July 1, 1994 This documeazt A0 p3&3urted on reuse paper - more any coateat oa the reverse iaide DIVISION OF ENVIRONMENTAL MANAGEMENT JULY 1,1994 MEMORANDUM TO: Jay Lucas THRU: Carla Sanderson FROM: Michelle Wilson 00 r, W1 R � L The last Waste Load Allocation was finalized on July 19, 1993 and the permit was never issued. Meanwhile, the Rocky River Study was completed (3/31/93) and the results which pertain to this facility are as follows: "Any new or expanding discharge in the lower watersheds of the Rocky River should receive a total BODu limit of 32 mg/1 or less. .. This level of treatment will protect the DO standard as well as preventing any one discharge from using up 100 percent of the available assimilative capacity of the river". A formal Waste Load Allocation was not requested; however, the limits given on the last WLA were reviewed to insure water quality. It was determined that it is necessary to change the NH3N and the BOD5 limits for the expanding flow to receive a BODu of 32 mg/1 or less. Therefore the following limits were recommended: Monthly Average Summer Winter NH3N 2 4 BOD5 15 22 All other limits for both flows, including the chlorine limit for 0.95 mgd, should remain the same as recommended on the Waste Load Allocation request #7426. AdditionaN,since Reedy Creek is Water Quality limited any change in flow w' 1 require a change in limits in order to maintain current mass loading of oxygen consuming wastes. cc: Mooresville Regional Office- Rex Gleason c //* EXECUTIVE SLRvIIvIARY Water quality models for three sections of the Rocky River and its tributaries were joined to produce one calibrated model for 47.6 stream miles in the Yadkin River basin. This model was used to predict dissolved oxygen and biochemical oxygen demand concentrations at low flow conditions for both permitted and summer average discharge conditions. The general objective of this project was to provide a tool to assist with management of wastewater discharge issues in the upper watershed of the Rocky River. A more specific objective of the project was to provide a model that could be used to determine the appropriate waste load allocation for the Charlotte -Mecklenburg Utility Department (CMUD) Mallard Creek WWTP. CMUD has applied for an expansion of the Mallard Creek WWTP from 3 to 6 MGD. Results from this model indicate that water quality in the upper watershed of the Rocky River is not adequately protected by the current NPDES permit effluent limits. Under current operating conditions, that are well below permitted loads, the DO standard is not predicted to be violated in the Rocky River study area. However, three DO sags are predicted to drop to or near the stream standard, indicating that little assimilative capacity remains for oxygen consuming wastes. It is recommended that no new or expanded discharges be permitted in the study area unless an evaluation of engineering alternatives shows that it is the most environmentally sound alternative. If new or expanding discharges are permitted, they should receive best available technology limits in the watersheds above the confluence of Mallard Creek and the Rocky River, due to severely limited assimilative capacity. Any new or expanding discharge in the lower watersheds of the Rocky•River should receive a total BODu limit of 32 mg/l or less, equivalent to 10 mg/l BOD5 and 4 mg/1 NH3 for typical domestic discharges. This level of treatment will protect the DO standard as well as preventing any one discharge from using up 100 percent of the available assimilative capacity of the river. In addition, it is recommended that Mooresville WWTP, Mallard Creek WWTP, and Concord WWTP be encouraged to continue to meet advanced treatment levels. Upon expansion or modification, Mooresville WWTP and Concord WWTP should receive more advanced treatment requirements that will protect water quality in the Rocky River. This will mean advanced tertiary treatment at the Mooresville WWTP and limits at least as stringent as 10 mg/l BOD5 (5.7 mg/l CBOD5) and 4 mg/1 NH3 at the Concord WWTP. ii Dye Branch ky River Figure 1. Rocky River Study Area Mooresville Rivermile 1 WWTP 44 USGS Gage at SR 2420 To Concord To Charlotte on �e rD m Mallard Creek Mal l and Creek WWTP �•*jj��Sol Lac\, +ram!► Concord WWTP Muddy Creek 04Rivermile43 Downstream Study Boundary NPDES WASTE LOAD ALLOCATION PERMIT NO.: NC0030210 PERMIME NAME: FACILMY NAME: Charlotte -Mecklenburg Utility Department Mallard Creek Wastewater Treatment Plant Facility Status: Existing Permit Status: Renewal Major -4 _ Minor Pipe No.: 001 Design Capacity: 6.0 MGD Domestic (% of Flow): 98.3 % Industrial (% of Flow): 1.7 % Comments: t�9• Ltd y�yi�� RECEIVING STREAM: Mallard Creek Class: C Sub -Basin: 03-07-11 Reference USGS Quad: F16SW (please attach) County: Mecklenburg Regional Office:_ Mooresville Regional Office Previous Exp. Date: 9/30/94 Treatment Plant Class: Class IV Classification changes within three miles: „ 1 Requested by: Greg Nizich65 0 Date: 4/13/94 Prepared by: ' Date: Reviewed by: Date: 310 lJ IIJQ li., Icd / L/ Modeler Date Rec. 11 m cr g3 a Drainage Area (mil ) 51. S Avg. Streamflow (cfs): /. D 7Q10 (cfs) n. L q Winter 7Q10 (cfs) 2,1 30Q2 (cfs) 7. 9 Toxicity Limits: IWC ' % Acute hmmc Instream Monitoring: Parameters�c,lvltra�vr�T� �J r.j•br•^-%, oaxJuc,�u.� Upstream ✓ Location WnD Downstream ✓ Location --'SR 1 3 X ) Effluent Characteristics Summer Winter BOD5 (m ) Q NH3-N (mg/1) Z �% D.O. (mg/1) TSS (mg/1) F. Col. (/100 ml) pH (SU) _ 1 � r Q XY , Xx Y YX Comments 61 UV '41 K 1�1�'li Ar C-�Iy iYt&�[�MJN4� MPLmuor vn�mi�ly �rJ C�,N�, ,t, �N� A5 FACT SHEET FOR WASTELOAD ALLOCATION Request # 7832 Facility Name: Mallard Creek W WTP N.C. DEFT. OF NPDES No.: NCO030210 ENVIRONMENT, HEALTH. Type of Waste: 98.3% Domestic; 1.7°% Industrial & NATURAL RESOURCES Facility Status: Existing Permit Status: Renewal JUN 14 1994 Receiving Stream: Mallard Creek Stream Classification: C DIVISION DE INVINONNENiAI NANAOENENT Subbasin: 03-07-11 Mecklenburg Stream "WgV"E�AI 091E County: Regional Office: Mooresville RO A�� USGS #0212415000 Requestor. Greg Nizich Date: 5/2189 Date of Request 4/13/94 Drainage Area (mi2): 37.5 Topo Quad F16SW Stunmer 7Q10 (cfs): 0.64 Winter 7Q10 (cfs): 2.1 Average Flow (cfs): 41.0 30Q2 (cfs): 2.9 IWC (%): 94 C z .v _C Wasteload Allocation Summary N) - facility requested a modification to upgrade to 6 MGD a year ago and are now requesting permit renewal V - facility has passed all Chronic Toxicity tests for the last 3 years and wants to change the test from P/F to permit limit - instream monitoring and DMRs show no problems - performed toxicity evaluation based on data from facility self -monitoring. Recommend monitoring for Cu, Zn, Ni, CN, and Ag with limits of 27.0 ug/1 for Pb, 2.1 ug/1 for Cd, and 0.013 ug/1 for Hg - recommend maintaining all other limits since facility was evaluated only a year ago Requirements and Recommended by: Date: G Reviewed by Instream Assessment Regional Supervisor. Permits & Engineerin RETURN TO TECHNICAL SERVICES BY: JUL Date: 613/y91 Date: ` % S Date: 2 9' G ��i� CONVENTIONAL PARAMETERS Existing Limits: Monthly Average Summer Winter Wasteflow (MGD): 6.0 6.0 BOD5 (mgp): 5 15 NH3N (mg/1): 2 4 DO (mgft 6 6 TSS (mg/l): 30 30 Fecal Col. (/100 ml): 200 200 pH (Si): 6-9 6-9 Residual Chlorine (pg/1): monitor monitor Oil & Grease (mg/1): TP (mg/1): monitor monitor IN (mg/1): monitor monitor Recommended Limits: Monthly Average Summer Winter WQ or EL Wasteflow (MGD): 6.0 6.0 BOD5 (mg/1): 5 10 WQ NH3N (mg/1): 2 4 WQ DO (mg/1): 6 6 WQ TSS (mg/1): 30 30 EL Fecal Col. (1100 ml): 200 200 pH (Si): 6-9 6-9 EL ff Residual Chlorine (pgft i$- 48- WQ- YKM,�o� U�lM Oil & Grease (mg/1): d r v TP (mg/1): monitor monitor J IN (mg/1): monitor monitor Limits Chanties Due To: Parameter(s) Affected Change in 7Q10 data Change in stream classification Relocation of discharge Change in wasteflow Other (onsite toxicity study, interaction, etc.) Instream data New regulations/standards/procedures x Residual chlorine New facility information (explanation of any modifications to past modeling analysis including new flows, rates, field data, interacting discharges) (See page 4 for miscellaneous and special conditions, if applicable) .. . �- 3 TOMCSAIETALS Type of Toxicity Test: Chronic Toxicity Permit Limit Existing Limit: Chronic Toxicity P/F at 90% Recommended Limit: Chronic Toxicity Permit Limit at 94% Monitoring Schedule: February, May, August, November Existing Limits Daily Max. COD (mg/): Cadmium (ug/1) 2.1 Chromium (ug/1): monitor monthly Copper (ug/1): monitor monthly Nickel (ug/1): 94.0 Lead (ug/1): 27.0 Zinc (ug/1): monitor monthly Cyanide (ugft 5.3 Phenols (ug/1): Mercury (ug/l):' 0.013 Silver (ug/1): monitor monthly Recommended Limits Daily Max WQ or EL COD (mgn: Cadmium (ug/1)'; 2.1 WQ Chromium (ug/1): Copper (ug ft monitor monthly Nickel (ug/1): monitor monthly Lead (ug/1): 27.0 WQ Zinc (ug/1): monitor monthly Cyanide (ug/1): monitor monthly Phenols (ug/1): Mercury (ug/1): 0.013 WQ Silver (ug/1): monitor monthly Limits Changes Due To: Parameter(, Affected Change in 7Q10 data Change in stream classification Relocation of discharge Change in wasteflow New pretreatment information x CN, Ni, Cr Failing toxicity ',test Other (onsite toxicity study, interaction, etc.) X Parameter(s) are water quality limited. For some parameters, the available load capacity of the immediate receiving water will be consumed. This may affect future water quality based effluent limitations for additional dischargers within this portion of the watershed. 1@0 No parameters are water quality limited, but this discharge may affect future allocations. INSTREAM MONITORING REQUIREMENTS Upstream Location: 200 feet above outfall Downstream Location: SR 1300 Parameters: temperature, DO, fecal coliform, conductivity Special instream monitoring locations or monitoring frequencies: MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS Adquacy of Existing Treatment Has the facility demonstrated the ability to meet the proposed new limits with existing treatment facilities? Yes X No If no, which parameters cannot be met? Would a "phasing in" of the new limits be appropriate? Yes _ No If yes, please provide a schedule (and basis for that schedule) with the regional office recommendations: L If no, why not? Wasteload sent to EPA? (Major) Y (Y or N) (If yes, then attach updated evaluation of facility, including toxics spreadsheet, modeling analysis if modeled at renewel, and description of how it fits into basinwide plan) Additional Information attached? Y (Y or N) If yes, explain with attachments. - see above Facility Name AALz_*9 o ("79gsg U U 7P Permit # AIGoo go Z 10 Pipe # eol CHRONIC TOXICITY PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent concentration of _tL°lo nor measure a quarterly arithmetic average chronic value less than this same percentage of waste. The chronic value will be determined using the geometric mean of the highest concentration having no statistically detectable impairment.of reproduction or survival and the lowest concentration that does have a statistically 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. Collection methods, exposure regimes, and further statistical methods are defined in: The North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure (July, 1991) or subsequent versions. The permit holder shall perform at a minimum, quarterly monitoring using these procedures to establish compliance with the permit condition. The first test will be performed within thirty days from the effective date of this permit during the months of Fka, P A.4�A"_ Viv. 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 measures 48 hour acute toxicity or a chronic value less than that specified above, then multiple concentration testing shall be performed, at a minimum, in each of the two following months. 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, DEM Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Environmental Management 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 any test data from this monitoring requirement or tests performed by the North Carolina Division of Environmental Management 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 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 _ . 14 cfs Permitted Flow th MGD IWC 9 Al % Basin & Sub -basin Receiving Stream County Recommended by: Date QPIIL Version 7191 * * Facility Name = Mallard Creek WWTP * NPDES # = NCO030210 * Qw (MGD) = 6.00 * 7Q10s (cis)= 0.64 * 1WC (%) = 93.56 * * FINAL RESULTS A L * Copper;, -19.0 ^ * Max. Pred Cw 34.2 * Allowable Cw 7.5 * * Chromium 5.0 * Max. Pred Cw 5.0 * Allowable Cw 53.4 * AL 99.0 Max. Pred Cw 158.4 * Allowable Cw 53.4 * * Nickel 15.0 * Max. Pred Cw 15.0 * Allowable-Cw 94.1 * * ® 25.0 * Max. Pred Cw 45.0 * Allowable Cw 26.7 * * Cadmic 5.0 * Max. Pred Cw 5.0 * Allowable Cw 2.1 * * Cyanide 2.5 * Max. Pred Cw 2.75 * Allowable Cw 5.34 * * 0.1 * Max. Pred Cw 0.1 * Allowable Cw 0.0 * aL son * Max. Pred Cw 5.00 * Allowable Cw 0.06 * * Parameter = Copper * Standard = 7 µg/l * * * n Conc. DL RESULTS * 1 5 * Std Dev. 4.1 * 2 5 * Mean 8.5 * 3 5 * C.V. 0.5 * 4 5 * 5 5 * 6 10 Mult Factor 1.8 * 7 5 * Max. Value 19.0 pg/l * 8 5 * Max. Pred Cw 34.2 jig/1 * 9 5 * Allowable Cw 7.5 jig/1 * 10 12 * 11 5 * 12 5 * 13 13 * 14 17 * 15 5 * 16 5 * 17 11 * 18 13 * 19 19 * 20 10 * 21 12 * 22 5 * 23 5 * 24 10 * 25 10 * 26 10 * 27 12 * 28 12 * 29 5 * 30 12 * 31 5 * 32 * 33 * 34 * 35 * 36 * 37 Page 1 Parameter = Chromium Standard = 50 ug/1 n Conc. DL RESULTS 1 5 * Std Dev. 0.0 2 5 * Mean 5.0 - - 3 ---5 * C.V. - - -- 0.0 4 5 5 5 6 5 * Mult Factor 1.0 7 5 * Max. Value 5.0 ug/l 8 5 * Max. Pred Cw 5.0 pg/l 9 5 * Allowable Cw 53.4 µg/l 10 5 11 5 12 5 13 5 14 5 15 5 16 5 17 5 18 5 19 5 20 5 21 5 22 5 23 5 24 5 25 5 26 5 27 5 28 5 29 5 30 5 31 5 32 33 34 35 36 37 I I Parameter = Zinc - Standard = I 50 ug/1 I n Conc. DL RESULTS I 1 68 Std Dev. 21.4 I 2 94 Mean 55.2 3 25 * C.V. --0-.4 I 4 81 I 5 25 I 6 64 Mult Factor = 1.6 I 7 51 Max. Value 99.0 ug/l I 8 51 Max. Pred Cw 158.4 µg/l I 9 25 * Allowable Cw 53.4 ug/l I 10 52 I 11 69 I 12 59 I 13 90 I 14 25 I 15 59 I 16 55 I 17 25 I 18 25 I 19 65 I 20 42 21 42 I 22 50 23 63 I 24 74 I 25 50 I 26 25 I 27 99 I 28 67 29 76 I 30 61 I 31 54 I 32 I 33 I 34 I 35 I 36 I 37 Page 2 Parameter = Nickel Standard = 88 leg/1 n Conc. DL RESULTS 1 15 * Std Dev. 0.0 2 15 * Mean 15.0 3 15 * C V 0 0 Parameter = Lead Standard a 25 ug/l n Conc. DL RESULTS 1 7.5 * Std Dev. 2 18 Mean 3 7 5 *-- C V 4 15 * I 4 7.5 5 15 * I 5 7.5 5.2 9.9 -0.5 6 15 * Mult Factor = 1.0 I 6 7.5 * Mult Factor 1.8 7 15 * Max. Value 15.0 pg/l I 7 7.5 * Max. Value 25.0 µg/1 8 15 * Max. Pred Cw 15.0 ug/1 I 8 7.5 * Max. Pred Cw 45.0 ug/1 9 15 * Allowable Cw 94.1 µg/1 I 9 7.5 * Allowable Cw 26.7 ug/1 10 15 * I 10 7.5 11 15 * ( 11 7.5 12 15 * ( 12 7.5 13 15 * I 13 7.5 14 15 * I 14 7.5 15 15 * I 15 7.5 16 15 * I 16 7.5 17 15 * I 17 25 18 15 * I 18 23 19 15 * I 19 19 20 15 * I 20 19 21 15 * I 21 7.5 22 15 * I 22 7.5 23 15 * I 23 7.5 24 15 * I 24 15 25 15 * I 25 7.5 26 15 * I 26 7.5 27 15 * I 27 7.5 28 15 * I 28 7.5 29 15 * I 29 7.5 30 15 * I 30 7.5 31 15 * ( 31 7.5 32 I 32 33 I 33 34 ( 34 35 I 35 36 I 36 37 I 37 Page 3 Parameter = Cadmium Standard = 2 pg/l I I n Conc. DL RESULTS I I 1 5 * Std Dev. 0.0 I 2 5 * Mean 5.0 I 3 5 * C.V.- -0-.0 4 5 * I 5 5 * I 6 5 * Mult Factor 1.0 I 7 5 * Max. Value 5.0 pg/l I 8 5 * Max. Pred Cw 5.0 pg/l I 9 5 * Allowable Cw 2.1 pg/l I 10 5 * I 11 5 * I 12 5 * I 13 5 * I 14 5 * I 15 5 * I 16 5 * I 17 5 * I 18 5 19 5 * I 20 5 * I 21 5 * I 22 5 * I 23 5 * I 24 5 * I 25 5 * I 26 5 * I 27 5 * I 28 5 * I 29 5 * I 30 5 * I 31 5 * I 32 33 I 34 I 35 I 36 I 37 I Parameter = Cyanide Standard = 5 pg/1 n Conc. DL RESULTS 1 2.5 * Std Dev. 0.3 2 2.5 * Mean 2.5 - -- 3 2.5 *_ _ ._-_-G.V. 0.1 4 2.5 5 1 6 2.5 * Mult Factor 1.1 7 2.5 * Max. Value 2.5 pg/1 8 2.5 * Max. Pred Cw 2.75 pg/l 9 2.5 * Allowable Cw 5.34 pg/l 10 2.5 11 2.5 12 2.5 13 2.5 14 2.5 15 2.5 16 2.5 17 2.5 18 2.5 19 2.5 20 2.5 21 2.5 22 2.5 23 2.5 24 2.5 25 2.5 26 2.5 27 2.5 28 2.5 29 2.5 30 2.5 31 2.5 32 33 34 35 36 37 Page 4 Parameter = Mercury I I Parameter = Silver Standard = 0.012 ug/l I Standard = I 0.06 pg/1 n Conc. DL RESULTS I n Cone. DL RESULTS 1 0.1 * Std Dev. 0.0 ( 1 5 * Std Dev. 0.0 2 0.1 * Mean 0.1 I 2 5 * Mean 5.0 3 --0.1 * C . V . - - 0.0 I - --__: _ 3 - 5 - - * - ----C . V .----0.0 4 0.1 * I 4 5 5 0.1 * I 5 5 6 0.1 * Mult Factor 1.0 I 6 5 * Mult Factor = 1.0 7 0.1 * Max. Value 0.1 ug/l I 7 5 * Max. Value 5.0 ug/l 8 0.1 * Max. Pred Cw 0.1 µg/l I 8 5 * Max. Pred Cw 5.0 ug/l 9 0.1 * Allowable Cw 0.0 ug/l ( 9 5 * Allowable Cw 0.1 µg/l 10 0.1 * I 10 5 11 0.1 * I 11 5 12 0.1 * I 12 5 13 0.1 * I 13 5 14 0.1 * I 14 5 15 0.1 * ( 15 5 16 0.1 * I 16 5 17 0.1 * I 17 5 18 0.1 * I 18 5 19 0.1 * ( 19 5 20 0.1 * I 20 5 21 0.1 * I 21 5 22 0.1 * I 22 5 23 0.1 * I 23 5 24 0.1 * I 24 5 25 0.1 * I 25 5 26 0.1 * ( 26 5 27 0.1 * ( 27 5 28 0.1 * I 28 5 29 0.1 * I 29 5 30 0.1 * I 30 5 31 0.1 * I 31 5 32 I 32 33 ( 33 34 I 34 35 I 35 36 I 36 37 I 37 Page 5 WLA NOTES NCO030210 6/94 Mallard Creek WWTP TMG #7832 - The facility is currently upgrading to 6 MGD. This permit modification was approved a year ago and the permit is now up for renewal. - A QUA12E model was done on this section of the Rocky River and Mallard Creek (report released March 31,1993). It showed this area of Mallard Creek has no additional assimilative capacity. The facility was given summer limits of 5 mg/l BODS, 2.0 mg/1 NH3-N, and 6.0 mg/1 DO (BAT). - Facility has passed all whole effluent toxicity test for the past three years and has requested the Chronic Toxicity Permit Limit (Qrtrly) test instead of the pass/fail test. - instream monitoring data show a slight decrease in DO and a consistent increase in conductivity downstream of the discharge. The lowest instream DO for the last 15 months was 6.5 mg/l. - DMR data show the plant is generally operating well. - Toxicity analysis shows that the max. predicted concentrations for Cu, Zn, Pb, Cd, Hg and Ag are higher than the allowable concentration. Recommend monitoring for Cu, Zn, Ni, CN, and Ag. Recommend limit of 27.0 ug/1 for Pb, 2.1 ug/1 for Cd, and 0.013 ug/l for Hg. Limits were changed to monitoring for Ni and CN since the max. predicted concentration was much lower than the allowable concentration. Monitoring for Cr was dropped for the same reason. Cr will be monitored for in the long term monitoring required by Pretreatment. The limit for mercury was kept since the limit is much below the detection limit and Joe Pearce in Pretreatment considered it unusual to see the number of nondetects reported in Mallard Creek's DMRs. - Recommend renewal of all other limits since this permit was just updated a year ago for the expansion: - see previous WLA for stream schematic Facility: Mallard Creek WWTP AMMONIA ANALYSIS: SUMMER 7010: 0.640 cfs NH3-N Effl. Conc: 15.00 mg/I Standard (1 mgA): 1000 ug/I Upstream NH3-N Conc.: 220 ug/I Design Flow: 6.00 MGD Predicted NH3-N Instream: 14048 ug/I 14.05 mg/I NH3-N Limit: 1053.7 ug/I 1.05 mg/I L"NIZ10 7010: 2.10 cfs NH3-N Effl. Conc: 15.00 mg/I Standard (1.8 mg/i): 1800 ug/I Upstream NH3-N Conc.: 220 ug/I Design Flow: 6.00 MGD Predicted NH3-N Instream: 12277 ug/I 12.277 mg/I NH3-N Lima: 2156.8 ug/I 2.1568 mg/I CHLORINE ANALYSIS: 7010: 0.640 cfs cfs Effluent Concentration: 1.00 mg/I mg/I Instream Standard: 17 ug/I ug/I Upstream Chlorine Conc.: 0.00 ug/I ug/I Design Flow: 6.00 MGD MGD Predicted NH3-N Instream: 936 ug/l ug/I 0.94 mg/I mg/I LIMIT: 18.17 ug/I ug/I 0.018 mg/I mg/I ►71: :►� II•►I•: ► Upstream Location: 1.5 mi above outfall Month Min DO (m Ave DO m I Max GODS m Ave BOD5 (m /p Ave Cond (umhos) Max FC { 100m Ave FC 100mD Ave Temp (dea C Mar-94 8.7 9.7 2.7 1.9 129 1660 447 15 Feb-94 9.4 10.3 IA 1 128 530 179 12 Jan-94 8.9 10.8 3.2 2.3 94 1200 284 7 Dec-93 10.2 10.6 3.8 2.5 109 11400 2728 11 Nov-93 8.4 9.7 2.8 1.7 138 970 260 13 Oct 93 8.2 9.1 1.9 IA 161 600 162 15 Se 93 8.0 8.6 3.3 1.4 155 44000 429 20 Au 93 7.8 8.2 5.1 1.6 150 18000 510 22 Jul-93 7.6 8.0 4.3 1.8 153 7600 1131 23 Jun-93 5.7 7A 5.7 3.3 167 12600 2813 21 Ma 93 7.4 7.7 3.7 2.5 149 8000 4145 20 Apr-93 9.2 9.8 2.9 ] A 118 1400 226 15 Mar-93 9.4 10.9 2.6 1.6 93 900 235 11 Feb-93 11.0 11.51 3.1 2.11 1031 4201 1381 j0 Jan-931 9.91 10.91 3AI 2.11 801 10001 3201 11 Downstream 1 Location: 2mi below outfall Month Min DO Ave DO Max BOD5 ( Ave BOD5 /p Ave Cond umhos Max FC 100mn Ave FC 100m Ave Temp d Q Mar-94 8.6 9.5 2.5 1.9 170 1920 406 16 Feb-94 9.3 10.3 2.4 1.6 165 310 174 12 Jan-94 9.1 10.8 5 3.6 131 1800 373 9 Dec-93 9.7 10.2 4 2.6 146 9900 2225 11 Nov-93 7.7 9.0 2.9 1.8 265 2250 492 15 Oct-93 7.5 8.2 1.3 1.1 351 170 92 18 Se 93 7.3 7.9 7.3 1.9 320 39200 410 21 A 93 7.2 7.6 4.1 1.6 287 15000 399 23 Jul-93 6.7 7A 4.2 1.9 296 9000 1221 24 Jun-93 6.6 7.2 5.1 3.3 293 8900 3871 22 Ma 93 7.5 7.7 3.7 2.3 237 6400 3647 21 -93 9.0 9.7 3.6 1.5 166 1520 212 15 Mar-93 9.7 10.9 2.5 1.8 127 1500 171 12 Feb-931 10.3 1 11.0 10.1 5.11 163 5801 3361 11 Jan-931 9.81 10.81 3AI 2.51 ffil 16MI 5711 11 Downstream 2 Location: 3 ml below outfall Month Min DO m Ave DO m l) Max BOD5 (m /I) Ave BOD5 (m /1) Ave Cond (umhos) Max FC (/100mq Ave FC (/ 100mq Ave Temp (deg Q Mar-94 8.6 9.5 2A 1.6 167 1780 346 16 Feb-94 7.3 7A 2.2 1.4 167 240 170 13 Jan-94 8.2 10.7 3.5 2.2 117 1900 335 8 Dec-93 9A 10.3 3.9 2.5 153 4500 1585 11 Nov-93 7.21 8.9 3 1.7 306 520 331 15 Oct 93 7.81 8.6 1.8 1.3 371 400 188 17 Se 93 7.5 8.0 7.3 1.7 369 28500 688 21 Au -93 7.3 7.8 4.3 1.4 319 13000 531 22 Jul-93 7.1 7.7 4.9 1.8 338 7200 910 24 Jun-93 6.6 7.3 3.7 2.2 286 65M 2825 22 Ma -93 3.8 2.5 251 4400 3072 21 Apr-93 9.1 9.7 3A 1.7 155 1600 329 15 Mar-93 9.7 11.0 3.1 21 116 2200 171 12 Feb-93 10.6 112 7.9 4.21 W1 440 2611 11 Jan-931 9.91 10.81 3.3 2.51 881 1900 5ml 12 WHOLEEFFLUENTTOXICITY TESTING 0ISELF•M0Nrr0FUNG SUMMARY] Mm,May16,1994 FACII.Iry RFOIJIRFABTlT CMUD-IRWIN CRITIC WWFP P2-PFXM CUR LIM:83% Y 90 m - PASS PASS- PASS - PASS NCO024945N01lkgin:ll/INI F,,,nmy: Q PAP AJAN AMR JUL OCT NanCamp:Avg ChV 91 FAR FAIL PASS PASS -- --- 70.6 W >95.0 AS.0 - - Couny:ML'CKIJS4BURG Rcsion:MRO Subbmin: L M34 N 55.7 70.0 >90.o >W.9 -__ -__ >96.0 - - PF:15.0 S,ti.1 93 92.5 - -- >95.0 >95.0 7QIP. 4.90 UVC(%):A2.6 ': 94 >N.0 - - CMUD,MAUARD(RKWWIPNAM CIIRUM:90% W - - - - -- - - m PASS m m PASS PASS = - NCW30210N01 Begin:9/1/93 Fmpeticy: Q P/P A FM MAY AUG NOV NOnCOmp:SINGLE 91 - PASS - - PASS - = PASS _ PASS - Coumy:MC:CKUiNBURG Region: MRO Snbbuin:YADII 92 - PASS - - PA55 PASS --_ - PASS - PASS - PI2:6.0 SpeC.1 W - PASS - --- -- 7QIU0.M IWCI%):94.0 Oder: W - PASS - CMUD-MCALPINEWWI'P P2.PC•RM CIIR LIM:go% Y W PASS PASS - - PASS --- - PASS MR PASS m PASS - PASS NC'0024970=1 Degin:l llInt Poe ency: Q P/F A MAR JUN SEP DBC NonCamp:Avg ChV 91 - - PASS -- -- PASS -- _ PASS - - PASS Cmnty:MRCKIJNOURC, Regim:MRO Subbain: CMM 92 - - PASS - - PASS -- PASS - - PASS - - FAIL PF: 30.0 Sgdrr 7QI0 01 IWC(%) 99 35 94 PASS m PASS ('MIJU-MCDOWI9J-CRI9X IP WWPERM CUR UM:]2% Y W m - PASS PASS - - PASS PASS - - PASS PASS - - NI'lM1362]]ARI1 Ikpin: VlFll Ihep.my: Q 1'M A APRJIII.(KTJAN NmCOmp:51NGIJ! D1 PASS - - PASS - - PASS ---- 1'=amy:mut-RIJNIIIIRG R,,.on MRO Snldmaina'11133 92 PASS -- --- PASS PASS - - ^ - PASS --- ... PASS PF:3.W 6perl.l W PASS - - 7010-.180 DVC(%)7209 JNer N PASS - - CMIN-SUGAR C'RI9!K WWI p2-PURM CIIR LIM:91%, 90%IN 4/119S W NONE NONE M --- PASS PASS PASS - - UTE PASS b NCW24937MOI Begin:ll/191 P quenc,:Q PA' A PER MAY AUG NOV NmCnmp:Avg ChV 91 PASS PASS - - PASS = -- 88.5 - >0.0 - Counly:MITKLENDURG Regian:MRO Subbx.in:CM34 W - PASS - >W.0 72.3 >W.0 >90.0 - - >90.0 Pit! 14.67 5"1.1 93 - >W.0 - - >W.0 7QI0 1D IWCf%)RRM M1 . BI - 5875 950 COATI AMERIC'AN-SEVIER PLAm' PERM CUR LIM:15% N - PASS - - PASS PASS PASS - LATE PASS - NCWM24VWI BegW91IM3 forgemy: Q PIP A FPB MAY AUG NOV NonC-M:SNGIB of PASS PAW - - PASS - PASS - - PASS - Counly:MCI)OW11L Region: ARO Subbain: CG330 92 - PASS - - PASS PASS _ - - PASS - - PASS - PIc:2.W Speei.l m - PASS - - 7t110 IA W IWC(%) 1470 94 - PASS - 1'RIX INC OF ROCKY MOUNT PFRM CIIR LIM:3.3%(GRAD) PASS PASS - PASS PASS - ]7a)7N01 DePn:5l11AJ0 rvequmcy: Q PAt A FED MAY AUG NOV NmComp: 91 - PASS - - PASS PASS _ - FAR PASS tr EDGUCOMBE Region: RRO Subba.in:TAR02 [yUIN040.7 92 - PASS - - PASS PASS _ _ - - PASS - - PASS Spml.l m - PASS - - .9D/ DVC(%T.3.3 T N - PASS - C(Kil•NIXIX IEASING CORPORA'I ION-COJ PI!RM CUR LIM:70% - - NC0058271100 Begin:l/IM2 Fmpeney: Q PAr A TAR MAY AUG NOV NonCemp:Single 91 - - - - FAIL PASS - PASS - - PASS _ Covnly:DUPLIN Regian:WIRO Subbuio:CPF22 92 - PASS _ _ PASS - FAIL PASS - PASS - PF:VAR Smcl.l 93 - PASS 7Q10 00 IWCf%) 1000 ONer 94 - PASS - <YK:FNfRIX LFASiNG CORPORAI'JONN03 PERM AC UM:NO AC FpHD(GRAB) N - - - - m PASS PASSI bt PASSI m m PASSI PASS! NCW5A29/NO3 &Fin:9/I/91 Aapemy: Q P/F A MAR TUN SEP DUC NnnComp: 91 - - PASSf = PASS! _ _ PASSI - - PASSE Con.,MANN Rcgim: FVO Sn14w.iv:CPI;I6 B2 - - PASSI _ _ I'ASSI - - PASSIPA991 - - I•F:O.Ig slena tY.t _ �- PA,SSI PASSI 7QID 74000 rWC(%)002 fTKil-W IUX IJ'.ASING.LUM WJ PERM AC LIM:50% W - - 3].48• ]3.43' - 1401`11 Am. >1W' - - NONE* - NC 00593011003 Be8inA l/I4/91 Fmpeory: Q A FI D MAY AUG NOV N-CnmP: 91 - 65.7' - -- >1W' ".61 Caunt, 110DISON Rcgion:PRO Subbmin:LUMSI 92 - >I W >1W - - - - >1W' AN' - PF:0.45 SpeW N - ANA - - 70ID 1280 IWCY%TOW thtler W - 1W' - 02mnuulivefnilum.=nlgniF'cminommnmlimm Y Pm IM10Mt. Avnilnble UiGEND: 1•IiRM=Permit Requirtmem LEf=Adminintnniw Leanr.T.tgel Ponneney= MonimtinR fm9uency: Q-QumcdY; M- ManthlY;BM. Binentldy:SA- Semiannvnlly: A. Annuilly; OWD- Only when dieehorginR:D. Dimonditued monitoring m9uimmeng IS. Conducting independent nuy DiR = Penton lhmwitd ]Q10=NemivinR.trtvnlow Dow criterion (cU) A- anetly mpnilenngimeonte.lomonthly-lent nnRle fnlum Montle ft..fng meet armr-u. JAN,APILJULAJCT NonCnmp= Content Compliance Reeluimment PIr=Petmitlednow(MGD) DYC%=Lmteamw-Io-ccnm0on P/r, 7a .yI dwniclett AC=AMe CH=Chtvnic Om Notmion: f- rmin,d Minnow: • - 4rim-ninti..n.: mv. My id xbdme: ChV-Cluonic vni.: P. Mmtelity of mtd netee,on. At hiehent mneentmtim: of - Perfomed by Dr•M A. Tee Gmun: b - Oad I[.1 ReryminF Nawinnr--=Ike mx mlvirtJ; NN-Nat rtpmpd;O-Oeginninp al QuoPcr F.cilily Activily Smm.: 1-Ineeim N-Newly luvedffv mnmene0; 11- Active Mn notdicMging; t-Mart dote nv.ilrtb fm month in qutttion SIG=ORGignmvrt n«ded 12 a.- LONG TERM MONITORING PLAN REQUEST FORM FACILITY: CMUD - Mallard NPDES NO.: N00030210 EXPIRATION DATE: 9 /3 0 / 9 4 REGION: NFL P&E REQUESTOR: Greg Nizich PRETREATMENT CONTACT: Joe Pearce DATE OF REQUEST 4 / 14 / 9 4 INDICATE THE STATUS OF PRETREATMENT PROGRAM: 1) THE FACILITY HAS NO SIU'S AND SHOULD NOT HAVE PRETREATMENT LANGUAGE. 2) THE FACILITY HAS OR IS DEVELOPING A PREATREATMENT PROGRAM. 3) ADDITIONAL CONDITIONS REGARDING THE PRETREATMENT PROGRAM ATTACHED. PERMITTED FLOW: e�_- t % INDUSTRIAL V % DOMESTIC = a Pretreatment Unit Staff (Region) Jeff Poupart(WSRO) Dana Folley (RRO, WaRO) Tom Poe (FRO, ARO, WiRO) Joe Pearce (MRO) SENT BY:Xerox Telecopier 7020 4-18-94 2:15PM w -� 919 733 9919+# 1 �I IZ I II CMUD. �SPD- CHARLOTTE-MECKLENBURG UTILITY DEPT. SYSTEM PROTECTION DIVISION. 5100 13ROOKSHIRE BOULEVARD CHARLOTTE; N.C. 28216 FAX NUMBER: (704) 393-2219 o14911A •. TELECOPY TO: Joe Pearce. NCDEHNE-DEM FAX NUMBER: (919)2.33-!,9919 Faonn: Dawn K. Padgett PHONE: (704) 394-9284, EXT. 124 # PAGES INCLUDING THIS SHEET: C+ O M M E I TS: Joe. Mors erQ_zhe metals samples ene/ysls for M 1/" Cr WWT 1 I the ��t veer. !f you need anvthln_o_ further tt�e_�so a" me a cell. _ Dawn PedAcr,ott --- yt9l9-fd- awastewater TreaWmf Plant MALLARD (ugIL) CREEK EFFLUENT 112Q193 1127193 21M 2110193 2117193 2124193 313193 3110193 3117193 3124,93 411193 417,93 Copper Chromium 12 '<10 13 L1 o 12 ,C 10 19 < 10 is <10 10 < 10 13 410 14 .410 10 410 17 410 14 < 10 10 Zinc Nickel -e- 50 -e� 30 < 54 < 30 < 50 < 30 < 50 30 < 50 < 50 < 50 450 < 50 < 50 < 5o < 10 < 50 T W-W <15 15 < 15 < < 15 < 30 < 15 <30 Z15 .c30 t15 < 30 415 41:� 30 .<20 < 30 a 15 t 30 4 15 30 15 Cadmiun SihNer < 30 < 30 < 30 < 30 < 30 a 30 a 30 < 30 z 30 � 30 . < 10 � 10 10 41-0 < 1.0 < 10 ,� 10 10 10 10 < 10 < 10 < 10 < 10 Cyanide 4093 4/5 3 <5 <5 ro , L i N .-I CL O C1 X - 0 L - z ' Lu � w st a' MALLARD (u9i-) CREEK m EFFLUENT" 4/14193 515M SM 193 5119193 SQ5193 6i3193 6110M 6117193 612M3 6130J63 711193 711 ;3 PPef Chromium 1 g < 10 13 < 10 14 < 10 .15 < 10 14 < 10 11 10 410 � 10 14 < 10 12 < 10 < 10 .410 10 < 10 10 410 t Zinc Nickel < 50 t 30 '450 < 30 < 50 E 30 <50 < 30 61 < 30 < 50 < 30 < 50 < 30 <50 30 <50 430 54 30 50 30 - E 5o T Lead Cadmium 415 < 10 15 < 10 «s < 10 17 < 10 < 15 < 15 < 15 < 15 < 15 < <15 < 15 < 30 20 Silver <1 o <10 < 10 < 10 < 10 < 10 ,< 10 /,10 410 < 10 < 10 410 < 10 < 10 < 10 < 10 10 < 10 41:� 1.0 < 10 Cyanide 4116193 <5 4119193 4129193 517193 * 5110193 5121193 5J24193 614193 617193 6118193 SQ1193 712/93 <5 <5 <5 45 {5 <5 <5 <5 <5 5 L � •4f X m W C1� MALLARD (ug&) o GKttK co EFFLUENT 7121 3 7128193 8f4f93 8111193.8118193 8125W 911I33 GAM 91IM3 S7W3 912M lof6M 1011.E Cam' Chromium <10 <10 <10 <10 13 <10. 12 < 10 <10 <10 <10 < 10 12 ,C 10 12 - 410 <10 < 10 12 <10 <10 < 10 <10 CID 10 zic 58 56 50 66 fib 68 99 67 76 61 54 63 <10 74 TLead Nickel < 30 23 < 30 < 15 < 30 .<15 < 30 .< 15 < 30 15 � 30 < 15 < 30 < 15 < 30 < 30 < 30 430 < 30 30 Cadmium <10 10 <10 .�10 410 <10 <10 415 <10 15 410 < 15 < 10 < 1*5 <10 < 15 <10 15 410 Silver � 10 410 <10 < 10 <10 <10 <10 <10 0 <10 < 10 410. - Cyanide 71 3 <5 7116M3 <5 7f30M 5 MOM 819M 8rM93 8123f93 9f3#93 917193 9f17193 9fmw 10f8m 1011'11.9 L <5 45 <5 45 <5 <5 1<5 <5 <5 /,5 CO CIO L 41 1 O. O ' d O X O L I` N m---- ----__ --------- -- --•-.. _.---_ ._-- -�__._- - - __.__..-- -------__---- F- W -- -- --_ -� n • Q, MALLARD (u91L) "- CREEK EFFLUENT 10120l9310!17l93 11l3l9311110311f17i93 11124f93 1212193 12093 121151°93 12121193 12131193 115194 .-Copper Chrcmium 10 <10 11 <10 19 .<10 10 <10 - 12 <10 G10 17 <10 4 10 11 13 i s 12 Zinc 50 450 65 < 50 < 50 10 < 50 <10 < 50 <10 59 <10 55 <10 <10 <10 f Nickel Lead. < 30 < 15 < 30 < 15 <30 19 430 < 30 < 30 � � { 15 < 30 < 50 < 30 < 50 < 30 5 2 < 30 r Cadmium <10 <10 <10 19 <10 �15 <10 t15 <10 <15 410 <15 <10 < 15 410 25 23 < 15 Silver <10 . <10 S10 <10 S 10 <10 �10. < 10 10 < 10 < 10 < 10 Cyarnde I 0=93 10125M I III 9Ci 45< 5 5 1118193 5 1111 W3 1112W3 12I 93 12106M 12H71M 1=0193 12131M 117194 � < < 5 < 5 < 5 < 5 .45 5 I N W i i i L N Q. O C.1 N d X O L d H W r l► O a ♦ C f °D MALLARD (ug&) M M CREEK /��C �j C* EFFLUENT 1112194111 M4 1i2419�3 2094 219194 21'16194 2123194 leverage i Copper <10 <10 13 10 <10 <10 <10 , < 12 Chromium < 10 < 10 < 10 < 10 < 10 410. <-10 < 10 Zinc 69 59 90 64 51 51. < 50 < 56 Mickel < 30 < 30 < 30 ,< 30 30 30 � 3tI T Lead < 15 < 15 <15 •<15 <15 .�15 <15 E16. Cadmium < 10 < 10 < 10 < 10 < 10 -,--10 < 10 < . 14 Steer < 10 <10 10 <10 < 1.0 '<1a <10 410 - 11101941/21194 1124194 214194 217194 2118M 2l21194 yanicle <5 <5 <5 <5 <5 <5 <5 <5 I f 1 4 I cv N L o_ o d i I x 0 w c� n s� 1 SOC Priority Project: Yes_ No X If Yes, SOC No.: To: Permits and Engineering Unit Water Quality Section Attention: Greg- Nizich Date: May 9, 1994 NPDES STAFF REPORT AND RECOMMENDATION County: Mecklenburg fl Permit No. NG0030210 PART I - GENERAL INFORMATION MAY 1 ; 1994 1. Facility and Address: Mallard Creek WWTP Charlotte Mecklenburg Uti.l.i.ty..D.e.p.t, 5100 Brookshire Blvd. Charlotte, North Carolina 28216 2. Date of Investigation: April 28, 1994 3. Report Prepared by: Kim H. Colson, Environmental Engineer 1 4. Persons Contacted and Telephone Number: Bob Graham, ORC, (704) 547-0680. 5. Directions to Site: From the intersection of US Hwy 29 and the US Hwy 29 and I-85 connector road, travel northeast on US Hwy 29 approximately 1.6 miles. Turn right onto the Mallard Creek WWTP entrance road. The WWTP is located at the end of the road. 6. Discharge Point(s), List for all discharge points: Latitude: 35' 19' 52" Longitude: 80' 41' 54" Attach a USGS map extract and indicate treatment facility site and discharge point on map. U.S.G.S. Quad No.: F16SW U.S.G.S. Quad Name: Harrisburg, NC 7. Site size and expansion area consistent with application? Yes. 8. Topography (relationship to flood plain included): Flat to moderate slopes; the WWTP appears to'be protected from the 100 year flood. 9. Location of nearest dwelling: None within 500 feet. 10. Receiving stream or affected surface waters: Mallard Creek a. Classification: C Page Two b. River Basin and Subbasin No.: Yadkin — Pee Dee 030711 C. Describe receiving stream features and pertinent downstream uses: Small to medium size creek, sandy/muddy bottom. General "C" classification uses downstream. PART II — DESCRIPTION OF DISCHARGE AND TREATMENT WORKS 1. a. Volume of wastewater to be permitted: 6.0 MGD (ultimate design capacity) b. Current permitted capacity of the wastewater treatment facility: 6.0 MGD C. Actual treatment capacity of the current facility (current design capacity): 6.0 MGD d. Date(s) and construction activities allowed by previous Authorizations to Construct issued in the previous two years: None.within last two years. e. Please provide a description of existing or substantially constructed wastewater treatment facilities: Existing WWT facilities consist of a manual bar screen, influent i pump station, mechanical screening, cyclone grit removal, three primary clarifiers, two trickling filters, two ` rectangular aeration/anoxic basins, four circular aeration basins, two anaerobic basins, two final clarifiers, chlorine disinfection, chlorine contact chamber, effluent filters, UV disinfection, two primary anaerobic digesters, one secondary anaerobic digester, sludge holding tank, centrifuge sludge dewatering, and sludge drying beds. The anoxic portion of the aeration/anoxic basins are being used for aeration at this time. Each rectangular aeration/anoxic basin is followed by two circular aeration basins which are converted clarifiers. The anaerobic basins are not used at this time. Chlorine disinfection is used as a backup to the UV disinfection system. The sludge centrifuge dewatering equipment was installed, but not yet operational at the time of inspection. f. Please provide a description of proposed wastewater treatment facilities: The facility will convert the former polishing pond to flow equalization and construct a covered sludge storage area when funds become available. An Authorization to Construct was previously - issued for these facilities. ' g. Possible toxic impacts to surface waters: The facility receives industrial wastewater which is described in the permit application. h. Pretreatment Program (POTWs only): The CMUD has an approved pretreatment program. Page Three 2. Residuals handling and utilization/disposal scheme: a. If residuals are being land applied, please specify DEM Permit No.: WQ0000057 Residuals Contractor: BioGro, Inc. Telephone No.: (704) 542-0937 b. Residuals stabilization: PSRP c. Landfill: N/A d. Other disposal/utilization scheme (Specify): N/A 3. Treatment plant classification (attach completed rating sheet): Class IV 4. SIC Code(s): 4952 Wastewater Code(s) Primary: 01 Secondary: Main Treatment Unit Code: 04103 PART III - OTHER PERTINENT INFORMATION 1. Is this facility being constructed with Construction Grant Funds or are any public monies involved (municipals only)? N/A 2. Special monitoring or limitations (including toxicity) requests: The facility has requested that the toxicity testing requirement be changed. The Aquatic Toxicology Unit should comment on the request. 3. Important SOC, JOC or Compliance Schedule dates (Please indicate): N/A 4. Alternative Analysis Evaluation: Spray Irrigation: N/A Connection to Regional Sewer System: N/A Subsurface: N/A Other disposal options: N/A 5. Air quality and/or groundwater concerns or hazardous materials utilized at this facility that may impact water quality, air quality, or groundwater: The Mecklenburg County Air Quality program may have concerns regarding the burn off of digester gas from the anaerobic digesters. There are no known groundwater or hazardous materials.concerns. b. Other Special Items: N/A i Page Four PART IV EVALUATION AND RECOMMENDATIONS The permittee, Charlotte - Mecklenburg Utility Department, has applied for permit renewal. The facility has been recently expanded and is still under construction for upgrading the facility. The facility will have biological nutrient removal capabilities once the upgrades are complete. Several other upgrades have not been completed including the conversion of the old polishing pond to flow equalization and construction of a covered sludge storage area. It is recommended that the permit be renewed. Signature of report preparer Water Quality 64ional Supervisor v ` Date CHARLOTTE March 31, 1994 Ms. Coleen Sullins, P.E. Supervisor, NPDES Permits Group Division of Environmental Management `^ State of North Carolina DEHNR Post Office Box 29535 , Raleigh, North Carolina 27626-0535 i Subject: NPDES Permit Renewal - NPDES Permit No. NC0030210- Mecklenburg County Dear Mg. Sullins: NOTE: This letter requests the renewal of the subject permit. I have attached City of Charlotte check no. 420378 in the amount of $300 for the required application processing fee. I have enclosed an original and two copies of the application form as required. I request that the new permit contain the Chronic Toxicity Permit Limit (QRTRLY) as per the attachment instead of the existing permit condition: Chronic Toxicity Pass/Fail Permit Limit (QRTRLY). If there are questions or a need for additional information regarding this renewal application, please contact me at telephone number 704 391-5060. Sincerely, Henry L/ Forrest Assists t Director attachment enclosures Administration Division 5100 Brookshire Boulevard Charlotte, NC 28216 704/399-2221 Charlotte -Mecklenburg Utility Department `F. CHRONIC TOXICITY PERMIT LIMPr (QRTRLY) The effluent discharge shall at no time exhibit 48 hour acute toxicity as lethality in an effluent concentration of 76% nor measure a quarterly arithmetic average chronic value less than this same ` percentage of waste. The chronic value will be determined using the geometric mean of the hi hest r• concentration having no statistically detectable impairment of reproduction or survival an the lowest concentration that does have a statistically 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. Collection methods, exposure regimes, and further statistical methods are defined in: The North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure (July, 1991) or subsequent versions. The permit holder shall perform at a minimum, quarterly monitoring using these procedures to establish compliance with the permit condition. The first test will be performed within thirty days from the effective date of this permit during the months of January,. April,. July and October. Effluent sampling for this testing shall be performed at the NPI)ES permitted final effluent discharge below all treatment processes. If the test procedure performed as tho first test of any single quarter measures 48 hour acute toxicity or a chronic value less than that specified above.. then multiple concentration testing shall be performed, at a minimum, in each of the two following months. . All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Norm (MR-1) for the months in which tests were performed, usuig,the parameter code THP3B for the Chronic "Value and TGA3B for the 48 hour Acute Toxicity megsurd_ (Pass/Fail). Additionally, DEM Form AT-3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina. Division of Environmental Management 4401 Reedy Creek Road Raleigh, NC 27607 Test data shall be complete and accurate and include all supporting chemicalfphysicai measurements performed in association with the toxicity tests, as well as all doselresponse 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 test data from this monitoring requirement or tests performed by the North Carolina Division of Environmental Management indicate potential impacts to the receiving stream, this permit may be m-opened and modified to include alternate monitoring requirements or limits. MOTE: Failure to achieve test conditions as specified in the cited document, such as minirnurri control organism survival and appropriate environmental controls, shall constitute an invalid test and will require immediate retesting (within 30 days of init! rnon' ing event). Failure to submit suitable test results will constitute noncompliance with monitoring requirements. G. pollutant Analysis Condition The permittee shall conduct a test for pollutants annually at the effluent from the treatment plant. The discharge shall be evaluated • as follows: 1) A pollutant analysis of the effluent must be completeri, annually using EPA approved methods for the following analytic fractions: (a) purgeabies (i.e., volatile crytinic compounds): (b) acid extractables; (c) hasejnetaral extractables;