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Home My WebLink AboutNC0074012_WASTELOAD ALLOCATION_19931208NPDES DOCUNENT SCANNING COVER SMEET NPDES Permit: NC0074012 Lincoln County/Forney Crk WWTP Document Type: Permit Issuance ------------- Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Speculative Limits Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: I December 8, 1993 This document to printed oa reuwe pamper - igrimaz-e aavr ooixteat tva the reYerwe Bide NPDES WASTE LOAD ALLOCATION PERMIT NO.: NC0074012 PERMITTEE NAME: Lincoln County Utilities FACILITY NAME: Middle Forney Creek Wastewater Treatment Facility Status: Existing Permit Status: Renewal Major Pipe No.: 001 Design Capacity: Minor 0.076 MGD* Domestic (% of Flow): Industrial (% of Flow): Comments: 100 % am *Permit renewal will contain limits for 0.076 MGD and 0.500 MGD only. The 0.076 flow has been determined from the actual caDacity of the existing plant RECEIVING STREAM: Forney Creek Class: C Sub -Basin: 03-08-33 Reference USGS Quad: F14NE County: Lincoln (please attach) Regional Office: Mooresville Regional Office Previous Exp. Date: 6/30/93 Treatment Plant Class: II Classification changes within three miles: None - Changes to WS-IV in Killian Creek - a rox. 5 miles downstream Requested by: Greg Nizich�'s Prepared by: Al Reviewed by Date: 9/3/93 Date: iZ 3 9 Comments: Date: �a L Modeler Date Rec. JE2j] � Drainage Area (mil 7 $ Avg. Streamflow (cfs): 7Q10 (cfs)) o4Winter 7Q10 (cfs) / — 30Q2 (cfs) 1. 7 Toxicity Limits: IWC / b % Acut hroni Instream Monitoring: %_"/�- Parameters Upstream _ Y _ hocation Downstream Y Location G DIVISION OF ENVIRONMENTAL MANAGEMENT September 3, 1993 MEMORANDUM To: Jackie Nowell Instream Assessment Unit From: Greg Nizich NPDES Permits Unit Subject: Lincoln County Middle Forney Creek WWTP NPDES Permit #NC0074012 Lincoln County I apologize for the number of WLA's requested for this apparently "simple" facility. The plans for the existing plant have been review and the 0.076 MGD capacity has been verified. The Regional Office agrees with our plan to structure the permit with limits pages for 0.076 MGD and 0.500 MGD. The facility has requested and P&E has agreed to have the chlorine limit for the 0.500 MGD flow only since the plant rated for 0.076 MGD has been operating for several years. Facility Name: NPDES No.: Type of Waste: Facility Status: Permit Status: Receiving Stream: Stream Classification: Subbasin: County: Regional Office: Requestor: Date of Request: Topo Quad: FACT SHEET FOR WASTELOAD ALLOCATION Request # Lincoln Co -Middle Forney Creek WWTP NCO074012 100% Domestic Existing Renewal Forney Creek C 030833 758 HEALTH +. NQ� 1 7 1993 Dtv15 % � �. �`Gl:�aw;l CE tCE t,h04��c5�It.�F Lincoln Stream Characteristic: t,, Mooresvill USGS # Nizich Date: 9/8/93 Drainage Area (mi2): 7.8 F14NE Summer 7Q10 (cfs): 0.6 Winter 7Q10 (cfs): 1.4 Average Flow (cfs): 8.8 30Q2 (cfs): 1.7 IWC (%): 16 Wasteload Allocation Summary (approach taken, correspondence with region, EPA, etc.) Facility requesting renewal of existing NPDES permit @ 0.076 MGD, the actual capacity of the plant. WLAs for 0.050, 0.250, and 0.500 MGD done 6/93. Special Schedule Requirements and additional comments from Reviewers: J �-�- dOA N u f Rcm. of •der t Recommended by: Date:1 l/l/93 Reviewed by Instream Date: Assessment: . _�Y�? 1 J Cl Regional Supervisorl_2 TJ Date. Permits &Engineering: Date: rt lm RETURN TO TECHNICAL SERVICES BY: DEC 0 4 1993 CONVENTIONAL PARAMETERS Existine Limi Monthly Average Summer Winter Wasteflow (MGD): 0.050 BODS (mg/l): 30 NH3N (mg/1): monitor DO (mg/1): monitor TSS (mg/1): 30 Fecal Col. (/100 ml): 1000 pH (SU): 6-9 Residual Chlorine (µg/1): monitor Temperature ('C): monitor TP (mg/1): monitor TN (mg/1): monitor Recommended Limi Monthly Average Summer Winter WQ or EL Wasteflow (MGD): 0.076 0.076 BODS (mg/1): 30 30 WQ NH3N (mg/1): 5.0 21 WQAT DO (mg/1): monitor monitor TSS (mg/1): 30 30 Fecal Col. (/100 ml): 200 200 pH (SU): 6-9 6-9 Residual Chlorine (µg/i): 28 28 Temperature (°C): monitor monitor TP (mg/1): monitor monitor TN (mg/1): monitor monitor Limits Changes 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 Fecal Coliform, NH3 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) INSTREAM MONITORING REQUIREMENTS Upstream Location: 50 ft. upstream of discharge Downstream Location: 1.0 mi. below the discharge Parameters: Temperature,DO, fecal coliform, conductivity Special instream monitoring locations or monitoring frequencies: MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS Adequacy of Existing Treatment Has the facility demonstrated the ability to meet the proposed new limits with existing treatment facilities? Yes 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: If no, why not? Special Instructions or Conditions Wasteload sent to EPA? (Major) _ (Y or N) (If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old assumptions that were made, and description of how it fits into basinwide plan) Additional Information attached? (Y or N) If yes, explain with attachments. SUMMER MODEL @ EXISTING DESIGN OF 0.076 MGD ---------- MODEL RESULTS ----- Discharger : EAST LINCOLN CO-FORNEY CR WWTP Receiving Stream : FORNEY CREEK --------------------------------------------------- The End D.O. is 6.04 mg/l. The End CBOD is 9.05 mg/l. The End NBOD is 4.11 mg/l. --------------------------------------------------- WLA DO Min CBOD (mg/1) Milepoint Reach # (mg/1) Segment 1 ---------------------- 5.59 5.30 5 ---- Reach 1 45.00 Reach 2 0.00 Reach 3 0.00 Reach 4 60.00 Reach 5 33.00 Reach 6 0.00 Reach 7 0.00 Reach 8 0.00 ----------------- WLA WLA NBOD DO Waste Flow (mg/1) ---- (mg/1) -- (mgd) ---------- 22.00 0.00 0.07600 0.00 0.00 0.00000 0.00 0.00 0.00000 90.00 0.00 0.02100 18.00 5.00 5.00000 0.00 0.00 0.00000 0.00 0.00 0.00000 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger : EAST LINCOLN CO-FORNEY CR WWTP Subbasin : 030833 Receiving Stream : FORNEY CREEK Stream Class: C Summer 7Q10 : 0.6 Winter 7Q10 : 1.4 Design Temperature: 26.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- 1 mile I ft/mil fps I ft Idesigni @201,z Idesignl @20;6 Idesignl Segment 1 I I 1 1.701 I 12.001 0.095 I I 1 0.73 1 I 0.31 1 0.23 I I 1 2.34 1 I 2.061 I 0.48 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.101 I 9.001 0.143 I I 1 1.23 1 I 0.30 1 0.22 I I 12.64 1 I 2.321 I 0.48 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 0.401 I 9.001 0.145 I I 1 1.24 1 I 0.30 1 0.23 I I 1 2.67 1 I 2.341 I 0.48 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 0.901 I 9.001 0.147 I I 1 1.25 1 I 0.30 1 0.23 I I 1 2.71 1 I 2.381 I 0.48 1 Reach -------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 Segment 1 I 1 1 1.801 1 9.501 0.359 1 1 1 1.45 1 1 0.34 1 0.25 1 1 1 5.05 1 1 4.431 1 0.48 1 Reach -------------------------------------------------------------------------------- 5 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.801 I 4.501 0.363 I I 1 2.02 1 I 0.30 1 0.23 I I 1 2.42 1 I 2.121 I 0.48 1 Reach -------------------------------------------------------------------------------- 6 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 2.101 I 4.501 0.363 I I 1 2.03 1 I 0.30 1 0.23 I I 1 2.42 1 I 2.121 I 0.48 1 Reach ---- 7 1 1 -------- 1 1 1 1 1 1 1 1 Segment 1 I I 1 0.701 I 4.501 0.360 I I 1 2.07 1 I 0.30 1 0.22 I I 1 2.40 I I 2.101 I 0.48 1 Reach -------------------------------------------------------------------------------- 8 I I I I I I I I I I 1 Flow cfs Segment 1 Reach 1 Waste 1 0.118 Headwaters) 0.600 Tributary 0.000 * Runoff 0.047 I CBOD I NBOD 1 D.O. mg/l mg/1 mg/l I 45.000 22.000 1 0.000 2.000 1.000 1 7.300 I 2.000 1 1.000 1 7.300 2.000 1 1.000 1 7.300 Segment 1 Reach 2 Waste 1 0.000 1 0.000 I 0.000 1 0.000 Tributary I 2.410 1 2.000 1 1.000 1 7.300 * Runoff I 0.110 1 2.000 1 1.000 1 7.300 Segment 1 Reach 3 Waste I 0.000 I 0.000 1 0.000 1 0.000 Tributary I 0.000 I 2.000 1 1.000 1 7.300 * Runoff 1 0.110 I 2.000 1.000 1 7.300 Segment 1 Reach 4 Waste I 0.033 60.000 190.000 1 0.000 Tributary I 0.000 2.000 1.000 7.300 * Runoff I 0.110 I 2.000 1 1.000 7.300 Segment 1 Reach 5 Waste 7.750 133.000 1 18.000 1 5.000 Tributary 1 0.000 2.000 1.000 7.300 * Runoff 0.110 2.000 1.000 7.300 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 1 10.800 2.000 1.000 7.300 * Runoff 0.000 2.000 I 1.000 1 7.300 Segment 1 Reach 7 Waste 0.000 I 0.000 I 0.000 1 0.000 Tributary 1 0.100 I 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 8 Waste I 0.000 I 0.000 0.000 1 0.000 Tributary I 0.740 1 2.000 1 1.000 1 7.300 * Runoff I 0.000 1 2.000 1 1.000 1 7.300 * Runoff flow is in cfs/mile SUMMER MODEL @ EXISTING 0.076 MGD Seg # I Reach # I Seg Mi D.O. I CBOD I NBOD I Flow I 1 1 0.00 6.10 9.06 4.45 0.72 1 1 0.10 6.10 8.83 4.29 0.72 1 1 0.20 6.11 8.62 4.14 0.73 1 1 0.30 6.13 8.41 4.00 0.73 1 1 0.40 6.15 8.20 3.86 0.74 1 1. 0.50 6.17 8.01 3.72 0.74 1 1 0.60 6.20 7.81 3.60 0.75 1 1 0.70 6.23 7.62 3.47 0.75 1 1 0.80 6.27 7.44 3.35 0.76 1 1 0.90 6.30 7.26 3.24 0.76 1 1 1.00 6.34 7.09 3.13 0.76 1 1 1.10 6.38 6.92 3.02 0.77 1 1 1.20 6.41 6.75 2.92 0.77 1 1 1.30 6.45 6.59 2.82 0.78 1 1 1.40 6.49 6.44 2.72 0.78 1 1 1.50 6.53 6.29 2.63 0.79 1 1 1.60 6.57 6.14 2.54 0.79 1 1 1.70 6.60 6.00 2.46 0.80 1 2 1.70 7.13 2.99 1.36 3.21 1 2 1.80 7.17 2.95 1.33 3.22 1 2 1.90 7.21 2.91 1.31 3.23 1 2 2.00 7.25 2.87 1.28 3.24 1 2 2.10 7.28 2.83 1.25 3.25 1 2 2.20 7.31 2.80 1.23 3.26 1 2 2.30 7.34 2.76 1.20 3.27 1 2 2.40 7.37 2.72 1.18 3.28 1 2 2.50 7.39 2.68 1.15 3.30 1 2 2.60 7.41 2.65 1.13 3.31 1 2 2.70 7.44 2.61 1.10 3.32 1 2 2.80 7.45 2.58 1.08 3.33 1 3 2.80 7.45 2.58 1.08 3.33 1 3 2.84 7.46 2.56 1.07 3.33 1 3 2.88 7.47 2.55 1.06 3.34 1 3 2.92 7.48 2.54 1.06 3.34 1 3 2.96 7.48 2.52 1.05 3.35 1 3 3.00 7.49 2.51 1.04 3.35 1 3 3.04 7.50 2.50 1.03 3.36 1 3 3.08 7.50 2.48 1.02 3.36 1 3 3.12 7.51 2.47 1.01 3.36 1 3 3.16 7.52 2.46 1.01 3.37 1 3 3.20 7.52 2.44 1.00 3.37 1 4 3.20 7.45 3.00 1.85 3.41 1 4 3.30 7.45 2.96 1.81 3.42 1 4 3.40 7.45 2.92 1.77 3.43 1 4 3.50 7.46 2.88 1.73 3.44 1 4 .3.60 7.46 2.84 1.70 3.45 1 4 3.70 7.46 2.80 1.66 3.46 1 4 3.80 7.47 2.76 1.63 3.47 1 4 3.90 7.48 2.73 1.59 3.48 1 4 4.00 7.48 2.69 1.56 3.49 1 4 4.10 7.49 2.66 1.53 3.50 1 5 4.10 5.77 23.55 12.87 11.25 1 5 4.20 5.74 23.40 12.76 11.27 1 5 4.30 5.71 23.24 12.64 11.28 1 5 4.40 5.69 23.09 12.53 11.29 1 5 4.50 5.66 22.94 12.42 11.30 DESIGN OF 1' 5 4.60 5.65 22.79 12.30 11.31 1 5 4.70 5.63 22.64 12.19 11.32 1 5 4.80 5.62 22.49 12.08 11.33 1 5 4.90 5.61 22.34 11.98 11.34 1 5 5.00 5.60 22.19 11.87 11.35 1 5 5.10 5.60 22.05 11.76 11.36 1 5 5.20 5.59 21.90 11.66 11.38 1 5 5.30 5.59 21.76 11.55 11.39 1 5 5.40 5.59 21.61 11.45 11.40 1 5 5.50 5.60 21.47 11.35 11.41 1 5 5.60 5.60 21.33 11.25 11.42 1 5 5.70 5.61 21.19 11.15 11.43 1 5 5.80 5.61 21.05 11.05 11.44 1 5 5.90 5.62 20.91 10.95 11.45 1 6 5.90 6.43 11.73 6.12 22.25 1 6 6.00 6.40 11.68 6.07 22.25 1 6 6.10 6.36 11.62 6.02 22.25 1 6 6.20 6.33 11.56 5.97 22.25 1 6 6.30 6.29 11.50 5.93 22.25 1 6 6.40 6.26 11.44 5.88 22.25 1 6 6.50 6.24 11.39 5.83 22.25 1 6 6.60 6.21 11.33 5.79 22.25 1 6 6.70 6.18 11.27 5.74 22.25 1 6 6.80 6.16 11.22 5.69 22.25 1 6 6.90 6.14 11.16 5.65 22.25 1 6 7.00 6.12 11.11 5.60 22.25 1 6 7.10 6.10 11.05 5.56 22.25 1 6 7.20 6.08 11.00 5.51 22.25 1 6 7.30 6.07 10.94 5.47 22.25 1 6 7.40 6.05 10.89 5.43 22.25 1 6 7.50 6.04 10.83 5.38 22.25 1 6 7.60 6.03 10.78 5.34 22.25 1 6 7.70 6.02 10.72 5.30 22.25 1 7 7.70 6.02 10.69 5.28 22.35 1 7 7.80 6.01 10.63 5.24 22.35 1 7 7.90 6.00 10.58 5.19 22.35 1 7 8.00 5.99 10.53 5.15 22.35 1 7 8.10 5.99 10.47 5.11 22.35 1 7 8.20 5.98 10.42 5.07 22.35 1 7 8.30 5.97 10.37 5.03 22.35 1 7 8.40 5.97 10.32 4.99 22.35 1 7 8.50 5.97 10.27 4.95 22.35 1 7 8.60 5.96 10.21 4.91 22.35 1 7 8.70 5.96 10.16 4.87 22.35 1 7 8.80 5.96 10.11 4.83 22.35 1 7 8.90 5.96 10.06 4.79 22.35 1 7 9.00 5.96 10.01 4.76 22.35 1 7 9.10 5.95 9.96 4.72 22.35 1 7 9.20 5.96 9.91 4.68 22.35 1 7 9.30 5.96 9.86 4.64 22.35 1 7 9.40 5.96 9.81 4.61 22.35 1 7 9.50 5.96 9.76 4.57 22.35 1 7 9.60 5.96 9.72 4.53 22.35 1 7 9.70 5.96 9.67 4.50 22.35 1 7 9.80 5.97 9.62 4.46 22.35 1 8 9.80 6.01 9.37 4.35 23.09 1 8 9.90 6.01 9.33 4.31 23.09 1 8 10.00 6.02 9.28 4.28 23.09 1 8 10.10 6.02 9.23 4.24 23.09 1 8 10.20 6.03 9.19 4.21 23.09 •.1' 8 10.30 6.03 9.14 4.18 23.09 1 8 10.40 6.04 9.10 4.14 23.09 1 8 10.50 6.04 9.05 4.11 23.09 Seg # I Reach # I Seg Mi D.O. CBOD I NBOD Flow I LINCOLN COUNTY MIDDLE FORNEY CREEK W WTP Residual Chlorine Ammonia as NH3 (summer) 7Q10 (CFS) 0.6 7Q70 (CFS) 0.6 DESIGN FLOW (MGD) 0.076 DESIGN FLOW (MGD) 0.076 DESIGN FLOW (CFS) 0.1178 DESIGN FLOW (CFS) 0.1178 STREAM STD (UG/L) 17.0 STREAM STD (MG/L) 1.0 UPS BACKGROUND LEVEL (UG/L) 0 UPS BACKGROUND LEVEL (MG/L) 0.22 IWC (%) 16.41 IWC 1%) - 16.41 Allowable Concentration (ug/I) 103.59 Allowable Concentration (mg/1) 4.97 Ammonia as NH3 (winter) 7010 (CFS) 1.4 Fecal Limit 200/100ml DESIGN FLOW (MGD) 0.076 Ratio of 5.1 1 DESIGN FLOW (CFS) 0.1178 ' STREAM STD (MG/L) 1.8 UPS BACKGROUND LEVEL (MG/L) 0.22 IWC (%) 7.76 Allowable Concentration (mg/1) 20.58 NC0074012 10/25/93