Loading...
HomeMy WebLinkAboutNC0021326_wasteload allocation_19921215NPDES WASTE LOAD AU OCATTON PERMIT NO.: NC0021326 PERMITTEE NAME: Town of Dobson FACILITY NAME: Dobson Wastewater Treatment Plant Facility Status: Existing Permit Status: Renewal with Modification Major Minor Pipe No.: 001 Design Capacity: 0.16/0.32 MGD Domestic (% of Flow): Industrial (% of Flow): 100 % Comments: Applicant requests renewal AND speculative limits at 0.320 MGD STREAM INDEX: 12-63-14 RECEIVING STREAM: Cody Creek Class: C Sub -Basin: 03-07-02 Reference USGS Quad: B 16NW, Dobson (please attach) County:_SAY _ Regional Office: Winston-Salem Regional Office Previous Exp. Date: 1/31/93 Treatment Plant Class: II Classification changes within three miles: Ca. 3 mi. to WS-II Fisher Creek Requested by: Jule Shankli �J Date: 9/8/92 Prepared by: Date: ti- Z Reviewed b Y: 16 C, a 141A Date: � 5 � -to b (,A) f �✓'� 5Z (a:'\ Modeler Date Rec. # Drainage Area (mi` )_ o, f2-Avg Streamflow (cfs): 1, 0+ 7Q10 (cfs) 0, (,0 Winter 7Q10 (cfs) p , Z_b 30Q2 (cfs) 0.36 Toxicity Limits: IWC % Acute/Chronic Instream Monitoring: Parameters i � u � -p.a. '" *L Fa64 Cotivocridrry Upstream Y Location K ueA5,T IGO Fr ups196A-0A Downstream Location3cw/Q `-r qwy bol (A) 19 46 Effluent 0,1l &41> O 3,z Characteristics BOD5 (m ) 0 3 v fl 30 NH3-N (mg/1) l•S 3.7 ( 3 2.to D.O. (mg/1) s Jr S TSS (mg/1) 3 D F. Col. (/100 ml) Zoo Z.00 o Z.oD 1418A S 'B43 8 3 6 6Z b 6Z Ra L ZZ Z Z. Comments: _',p.16 �!jo 1--ry ,u05c- M. _A UhtT 14 0. 32 #v P W WMl 15. wQ WQ Wp wT FACT SHEET FOR WASTELOAD ALLOCATION Facility Name: Dobson WWTP NPDES No.: NCO021326 Type of Waste: Domestic - 100% Facility Status: Existing Permit Status: Renewal Receiving Stream: Cody Creek Stream Classification: C Subbasin: 030702 County: Surry Regional Office: WSRO Requestor: J. Shanklin Date of Request: 9/8/92 Topo Quad: B 16NW Request # 7099 (A,B) RECEIVED N.C. Dept. of SHNIR OCT 2 7 1992 inston_&.x'Pe Regional Stream Characteristic: USGS # Date: Drainage Area (mi2): 0.8 Summer 7Q10 (cfs): 0.16 Winter 7Q10 (cfs): 0.26 Average Flow (cfs): 1.04 30Q2 (cfs): 0.36 IWC (%): 59.33 (A), 75.58 (B) Wasteload Allocation Summary (approach taken, correspondence with region, EPA, etc.) Facility wishes to expand their plant due to flow problems. This WLA outlines the required limits for renewal at 0.16 MGD and the speculative limits for expansion to 0.32 MGD. With the expansion, Dobson will have to meet an NH3-N limit and a chlorine limit. Instream data do not indicate any problems. The facility is not required to have a pretreatment program. Requirements and additional comments from Reviewers: vp Recommended by: �cl � `7-i`. Date: !a o Z Reviewed by Instream Assessment: Date: as Regional Supervisor: Date: Permits &Engineering: < Date: Nov 2 0 1992 RETURN TO TECHNICAL SERVICES BY: coNSKLTA Nt M�,�i€2 . 919�62� �3g31 2 CONVENTIONAL PARAMETERS Existing Li Monthly Average Summer Winter Wasteflow (MGD): 0.16 0.16 BOD5 (mg/l): 30 30 NH3N (mg/1): DO (mg/1): 5 5 TSS (mg/1): 30 30 Fecal Col. (/100 ml): 1000 1000 pH (SU): 6-9 6-9 Residual Chlorine (µg/l): MBAS (µg/1): 843 843 TP (mg/1): TN (mg/1): Recommended Limits: (A) (B) Monthly Average Monthly Average Summer Winter Summer Winter Wasteflow (MGD): 0.16 0.16 0.32 0.32 BODS (mg/l): 30 30 30 30 WQ NH3N (mg/1): ** 1.5 3.7 1.3 2.6 WQ/1 DO (mg/1): 5 5 5 5 WQ TSS (mg(1): 30 30 30 30 Fecal Col. (/100 ml): 200 200 200 200 pH (SU): 6-9 6-9 6-9 6-9 Residual Chlorine (µg/l): 22 22 MBAS (µg/1): 843 843 662 662 WQ Chronic toxicity: ** Qtrly P/F at 59% IN (mg/1): ** For the renewal at 0.16 MGD, the facility should have a choice between the NH3-N limit 1.5 mg/l (sum) and 3.7 mg/1 (win) or chronic quarterly toxicity testing at 59%. Region should inform Technical Support of the facility's choice. Limits Changes Due To: Parameter(s) Affected Change in 7Q10 data Change in stream classification Relocation of discharge Change in wasteflow NH3-N, MBAS Other (onsite toxicity study, interaction, etc.) Instream data New regulations/standards/procedures Fecal coliform, NH3-N/tox New facility information _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. •o No parameters are water quality limited, but this discharge may affect future allocations. INSTREAM MONITORING REQUIREMENTS Upstream Location: at least 100 ft upstream Downstream Location: downstream at Hwy 601 Parameters: temperature, DO, Fecal coliform, conductivity Special instream monitoring locations or monitoring frequencies: MISCELLANEOUS .ANEOUS INFORMATION & SPECIAL CONDITIONS AAd quacy of Existing Treatment Has the facility dem9pstrated the ability to meet th proposed new limits with existing atment n facilities? Yes No G�i�,�e' ����� S/a��' �'�� eC) A �� ,r�r� If no, which parameters cannot be met? 77 /,::D /w�'sr 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) _N (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? _N (Y or N) If yes, explain with attachments. rr l ?�1 VtY%rjG r987 ► VI°AS q - . if, «4:, o zt13f8Soo �a•rc 6,0�-e�s % (,'OAXI R I. t reo yj = 0-14 A4P b f� ivy; . EJ %SS = 3�70 3 ,rj�.,Aa ��� �, rags, � M Mc vjow-r<or.! oA, 7; c /y s- 0- y&f A1 r�3 �j4e(.c ) -1 1. gl?// % o". sAW tjc oo a l 3LP SPEC t a , a SA V✓ D�, (A)o o 01scpkA4c4 �)Aj (T. 1 i ii; ', Ahr-= / 3•.9= (,o - P �o oc i% r , oar► � - o • Z6 a, 3,S /Po V, pf, 1- 0. O.J&C6 ze. f 0-f -v/- . I- rwjG;lr� z 79, 51 Rz- goi Of 5, P-3---., --- S, (10 2Av loaf s14-la q,,Ff. = 0.3Z M6r, -'IVV (1'JFoe+4jo,u Ac�5C."o /Z CK4✓6 c cater: s ✓ F� fL£ — No D,A✓G— �/t1Q E �rJ� j'eel Agov 17-- - 45-,tor e fr�Jr�s , BA,NG oN A "" L` aCIJdJ �3 k�r�4 Cam; CAC SUMMER QEFF=0.32 MGD, BOD5=30 MG/L NH3-N=1.3 MG/L, DO=5 MG/L ---------- MODEL RESULTS ---------- Discharger DOBSON WWTP Receiving Stream CODY CREEK ---------------------------------------------------------------------- The End D.O. is 8.07 mg/l. The End CBOD is 5.91 mg/l. The End NBOD is 0.98 mg/l. ---------------------------------------------------------------------- DO Min (mg/1) Milepoint Reach # ------ --------- ------- Segment 1 5.60 0.00 1 Reach 1 Reach 2 Reach 3 Reach 4 5flvcf;> R 5 5on7 L-6PV A41 WLA WLA WLA CBOD NBOD DO Waste Flow (mg/1) ---- (mg/1) ---- (mg/1) -- (mgd) ---------- 45.00 5.85 5.00 0.32000 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 : DOBSON WWTP _Receiving Stream : CODY CREEK Summer 7Q10 : 0.16 Design Temperature: 25.0 Subbasin : 030702 Stream Class: C Winter 7Q10 : 0.26 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/miI fps I ft Idesignl @203/2 Idesignl @20V Idesignl Segment 1 I I I 1 0.101167.001 0.390 I 10.34 I I 11.13 1 0.89 I I 155.75 150.001 I I 0.73 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 i I 1 0.621 I 62.001 0.282 I 10.42 I I 1 0.76 1 0.61 I I 135.07 1 I 31.461 I 0.73 I Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.00I 35.001 I 0.270 10.72 I I 1 0.48 10.38 I I 118.98 1 I 17.031 I 0.73 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.00I I 35.00I I 0.284 1 0.76 I I 1 0.48 1 0.38 I I 119.94 1 1 17.881 I 0.73 I Reach -------------------------------------------------------------------------------- 4 I 1 1 1 1 1 I 1 1 1 Flow I CBOD I NBOD I D.O. I cfs I mg/1 I mg/l I mg/l I Segment 1 Reach 1 Waste 1 0.496 1 45.000 1 5.850 I 5.000 Headwatersl 0.160 1 2.000 1 1.000 1 7.440 Tributary 1 0.000 1 2.000 1 1.000 1 7.440 * Runoff 1 0.190 1 2.000 1 1.000 1 7.440 Segment 1 Reach 2 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary I 0.000 1 2.000 I 1.000 1 7.440 * Runoff I 0.190 1 2.000 1 1.000 1 7.440 Segment 1 Reach 3 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary I 1.210 1 2.000 1 1.000 1 7.440 * Runoff I 0.190 1 2.000 1 1.000 1 7.440 Segment 1 Reach 4 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary I 0.000 I 2.000 I 1.000 I 0.000 * Runoff I 0.180 I 2.000 I 1.000 I 7.440 SUMMER QEFF=0.32 MGD, BOD5=30 MG/L NH3-N= Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow 1 1 0.00 5.60 34.51 4.67 0.66 1 1 0.01 5.76 34.36 4.65 0.66 1 1 0.02 5.91 34.20 4.64 0.66 1 1 0.03 6.05 34.05 4.62 0.66 1 1 0.04 6.17 33.90 4.60 0.66 1 1 0.05 6.29 33.75 4.59 0.67 1 1 0.06 6.40 33.60 4.57 0.67 1 1 0.07 6.49 33.45 4.56 0.67 1 1 0.08 6.58 33.30 4.54 0.67 1 1 0.09 6.66 33.16 4.53 0.67 1 1 0.10 6.74 33.01 4.51 0.68 1 2 0.10 6.74 33.01 4.51 0.68 1 2 0.16 7.02 32.15 4.41 0.69 1 2 0.22 7.20 31.32 4.31 0.70 1 2 0.29 7.32 30.52 4.21 0.71 1 2 0.35 7.40 29.74 4.12 0.72 1 2 0.41 7.45 29.00 4.03 0.73 1 2 0.47 7.49 28.28 3.94 0.75 1 2 0.53 7.52 27.59 3.86 0.76 1 2 0.60 7.55 26.92 3.78 0.77 1 2 0.66 7.57 26.27 3.70 0.78 1 2 0.72 7.59 25.65 3.62 0.79 1 3 0.72 7.50 11.36 2.04 2.00" � 1 3 0.82 7.64 11.15 1.99 2.02 1 3 0.92 7.73 10.95 1.95 2.04 1 3 1.02 7.79 10.75 1.91 2.06 1 3 1.12 7.83 10.55 1.87 2.08 1 3 1.22 7.86 10.36 1.83 2.10 1 3 1.32 7.88 10.17 1.80 2.12 1 3 1.42 7.90 9.99 1.76 2.14 1 3 1.52 7.91 9.81 1.72 2.15 1 3 1.62 7.92 9.64 1.69 2.17 1 3 1.72 7.93 9.47 1.66 2.19 1 4 1.72 7.93 9.47 1.66 2.19 1 4 2.02 7.96 9.01 1.56 2.25 1 4 2.32 7.98 8.57 1.48 2.30 1 4 2.62 8.00 8.17 1.40 2.35 1 4 2.92 8.01 7.78 1.33 2.41 1 4 3.22 8.02 7.42 1.26 2.46 1 4 3.52 8.03 7.09 1.19 2.52 1 4 3.82 8.04 6.77 1.14 2.57 1 4 4.12 8.05 6.46 1.08 2.62 1 4 4.42 8.06 6.18 1.03 2.68 1 4 4.72 8.07 5.91 0.98 2.73,,---"'x Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I ( Cwp o ppapbR<: 10iq WINTER QEFF=0.32 MGD, BOD5=30 NH3-N=2.6 MG/L, DO=5 MG/L ---------- MODEL RESULTS ---------- Discharger : DOBSON WWTP Receiving Stream : CODY CREEK ---------------------------------------------------------------------- The End D.O. is 10.18 mg/l. The End CBOD is 5.71 mg/l. The End ---------------------------------------------------------------------- NBOD is 1.87 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 6.47 0.00 1 Reach 1 45.00 11.70 5.00 0.32000 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 : DOBSON WWTP Subbasin : 030702 Receiving Stream : CODY CREEK Stream Class: C Summer 7Q10 : 0.16 Winter 7Q10 : 0.26 Design Temperature: 14.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/miI fps I ft Idesignl @201h Idesignl @20'/2 Idesignl Segment 1 I I I 1 0.101167.001 0.435 I 1 0.34 I I 1 0.73 1 0.96 I I 143.88 1 I 50.001 I 0.32 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 0.621 I 62.001 0.319 I 1 0.43 I I 1 0.49 1 0.65 I I 131.27 1 I 35.641 I 0.32 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.00I I 35.001 0.350 1 I 0.75 I I 1 0.32 1 0.43 I I 119.37 1 I 22.071 I 0.32 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.001 I 35.00I I 0.371 1 0.80 I I 1 0.32 1 0.43 I I 120.52 1 I 23.381 I 0.32 1 Reach -------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 Flow I CBOD I NBOD I D.O. I cfs I mg/l I mg/1 I mg/1 I Segment 1 Reach 1 Waste 1 0.496 145.000 111.700 I 5.000 Headwatersl 0.260 1 2.000 1 1.000 1 9.280 Tributary I 0.000 I 2.000 1 1.000 I 9.280 * Runoff I 0.270 I 2.000 I 1.000 I 9.280 Segment 1 Reach 2 Waste I 0.000 I 0.000 I 0.000 I 0.000 Tributary I 0.000 I 2.000 I 1.000 I 9.280 * Runoff I 0.270 I 2.000 I 1.000 I 9.280 Segment 1 Reach 3 Waste I 0.000 I 0.000 i 0.000 I 0.000 Tributary 1 1.880 I 2.000 I 1.000 I 9.280 * Runoff 1 0.270 1 2.000 I 1.000 I 9.280 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary I 0.000 I 2.000 I 1.000 I 9.280 * Runoff I 0.280 1 2.000 I 1.000 1 9.280 WINTER QEFF=0.32 MGD, NH3-N=2.6 MG/L, I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow 1 1 0.00 6.47 30.21 8.02 0.76 1 1 0.01 6.68 30.08 7.99 0.76 1 1 0.02 6.87 29.95 7.96 0.76 1 1 0.03 7.05 29.82 7.94 0.76 1 1 0.04 7.22 29.69 7.91 0.77 1 1 0.05 7.38 29.57 7.88 0.77 1 1 0.06 7.53 29.44 7.85 0.77 1 1 0.07 7.67 29.31 7.82 0.77 1 1 0.08 7.80 29.19 7.80 0.78 1 1 0.09 7.92 29.06 7.77 0.78 1 1 0.10 8.04 28.94 7.74 0.78 1 2 0.10 8.04 28.94 7.74 0.78 1 2 0.16 8.60 28.21 7.57 0.80 1 2 0.22 8.98 27.51 7.41 0.82 1 2 0.29 9.24 26.84 7.26 0.83 1 2 0.35 9.42 26.20 7.11 0.85 1 2 0.41 9.55 25.58 6.96 0.87 1 2 0.47 9.64 24.99 6.82 0.88 1 2 0.53 9.70 24.42 6.69 0.90 1 2 0.60 9.75 23.87 6.56 0.92 1 2 0.66 9.78 23.34 6.44 0.93 1 2 0.72 9.81 22.83 6.32 0.95 1 3 0.72 9.46 8.99 2.79 2.83 1 3 0.82 9.64 8.88 2.75 2.86 1 3 0.92 9.78 8.76 2.72 2.88 1 3 1.02 9.87 8.65 2.69 2.91 1 3 1.12 9.94 8.54 2.66 2.94 1 3 1.22 9.99 8.44 2.63 2.97 1 3 1.32 10.02 8.33 2.60 2.99 1 3 1.42 10.05 8.23 2.57 3.02 1 3 1.52 10.07 8.13 2.55 3.05 1 3 1.62 10.08 8.03 2.52 3.07 1 3 1.72 10.09 7.93 2.49 3.10 1 4 1.72 10.09 7.93 2.49 3.10 1 4 2.02 10.12 7.65 2.41 3.18 1 4 2.32 10.14 7.39 2.34 3.27 1 4 2.62 10.14 7.14 2.27 3.35 1 4 2.92 10.15 6.90 2.21 3.44 1 4 3.22 10.16 6.67 2.14 3.52 1 4 3.52 10.16 6.46 2.08 3.60 1 4 3.82 10.17 6.26 2.03 3.69 1 4 4.12 10.17 6.07 1.97 3.77 1 4 4.42 10.17 5.88 1..92 3.86 1 4 4.72 10.18 5.71 1.87 3.94 I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow BOD5=30 DO=S MG/L -S t r c Bcc"Ack JO(DO Lot, k? 00 0110, Jfc D = ILOZD - 140 Q c v ") A i st disc SI�� 7- 61 0 Oc 6017- 0,70 '70 '70 000 S; AD ge)o le- �,q 5- 1 j,o instream sprdsht INSTREAM SELF -MONITORING DATA MONTHLY AVERAGES Discharger: � gso Receiving Stream: G Upstream Location: LS' kaodc DATE TEMP DO COND FECAL COLD 01 /9 02/9 03/9 04/9 05/9 06/9 07/9 08/9 09/9 10/9 11 /9 12/9 01 /91 02/91 03/91 04/91 05/91 06/91 07/91 08/91 09/91 10/91 11/91 12/91 01 /92 02/92 03/92 04/92 05/92 06/92 07/92 08/92 09/92 10/92 1 1/92 12/92 01 /93 02/93 Permit Number: NCao�_' i 3Z 6 Subbasin: Downstream Location: Soo' TPKAP m COND FECALCOU Page 1