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Home My WebLink AboutNC0020559_Wasteload Allocation_19860130NPDES DOCUHENT SCANNING% COVER MEET NPDES Permit: NC0020559 Henderson WWTP Document Type: Permit Issuance ww 'iA'vt� (Was1ocati>o` n Authorization to Construct (AtC) Permit Modification Complete File - Historical Correspondence Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: January 30, 1986 This document is printed on reuse paper - ignore any content on the reYerse side Facility. Name: Existing e Proposed O NPDES WASTE LOAD ALLOCATION C 3v-e er45n4 /J'.f6c s( ere e k LJCJ 7/' Permit No.: /J C oo Zo s-51 thgineer La Le Rec.. + :, LTG_ I (a t$ $j I a24-440 Date . •G/ZSins" Pipe No.: o d _ County: (�,,, c e, Design capacity (MGD) : q.8 , Industrial (.% of Flow) : Domestic (% of Flow) : /0d% Receiving Stream: huflusi (ftQ(C Reference USGS Qiad: 45ZS- Sw Class: C Sub -Basin: 0 3 - QL -06 (Please attach) Requestor: ,Me d1e,-c►st Regional Offices 'eke (Guideline limitations, if applicable, are to be listed on the back of this form.) Design 7.t.: "1 ? b 7Q10 (cfs) 0. O Drainage Area (mi2): Ai. 2. Winter 7Q10 (cfs) 0- 2-4 Location of D.O. 'minimum (miles below outfall): Velocity (fps) : ICI (base e, per day) : Avg. Streamflow (cfs) : 30Q2 (cfs) Slope (fpm ) 1(2 (base e, per day): guoUlige Effluent Characteristics ' Monthly Average Mom-t�►l �L2�G h 5.0 It el.0 0431r NN30 3.0 lr, (9.0 bo 6. b .,i1 t (0.0 ',it i i 6S 3O .► + 30 km/I Fecal ('.ottcorv,„ 100o / (000 eo14 ptit (A. �_-- (0— 1 9O - (0 — / `C V L-89 SovKwitt ' Effluent s Characteristics :'onthly 'average MowAtr it ,E4 - logo logo 1V1 3 ,11.0 (o -o --r-ff_, - , 30 30 _ • Co(tg-RArLi4 _, . Mot) o(x) ,- rg to-9 6-q Oaninents : Re.c.ow► peA4€Lr ccu 4 - t w .,+5 bake.3 oro to1,04tck,Teat Reviewed By:Z4i.I&&i Hate:, //30/S7-(e, J. Facility Name Type of Waste Status Receiving Stream Stream Class Subbasin County Regional Office Requestor Date of Request Quad WASTELOAD ALLOCATION APPROVAL FORM : CITY OF HENDERSON : DOMESTIC : EXISITNG : NUTBUSH CREEK : C : 030206 : VANCE : RALEIGH WWTP : DALE OVERCASH : 6/28/85 : B25SW Wasteflow (mgd) 5-Day BOD (mg/1) Ammonia Nitrogen Dissolved Oxygen TSS (mg/1) Fecal Coliform pH (SU) : . (mg/1) : (mg/1) : : (#/100m1) : Request No. : 2440 Drainage Area (sq mi) 7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs) Average Flow (cfs) RECOMMENDED EFFLUENT LIMITS SUMMER 4.14 5.0 3.0 6.0 30 1000 6-9 : 4.2 0. • 0 . : 0.24 : 3.7 WINTER SUMMER WINTER 4.14 4.14 4.14 9.0 6.0 10.0 6.0 3.0 6.0 6.0 7.0 7.0 30 30 30 1000 1000 1000 6-9 6-9 6-9 COMMENTS ALLOCATION IS PRELIMINARY. NEW LIMITS MAY BE PROPOSED BASED UPON RESULTS OF AN INTENSIVE WATER QUALITY SURVEY OF NUTBUSH CREEK. SEE THE ATTACHED MEMO. RECOMMEND PLACEMENT OF A RE -OPENER CLAUSE IN THE PERMIT TO ACKNOW- LEDGE THE LIKELIHOOD OF A CHANGE IN THE NPDES LIMITS. Recommended by Reviewed by: Tech. Support Supervisor Regional Supervisor Permits & Engineering Date Date Date R. DIVISION OF ENVIRONMENTAL MANAGEMENT January 23, 1986 MEMORANDUM. TO: File FROM: Trevor Clements SUBJECT: Henderson WWTP Wasteload Allocation The City of Henderson is apparently experiencing some difficulty in meeting their current NPDES permit limitations for BOD5 and NH3-N. Since their facility is capable of meeting a more stringent D.O. requirement, the City of Henderson has requested that DEM re-evaluate the limits for BOD5 and NH3-N assuming either a D.O. of 6.0 mg/1 or 7.0 mg/1. Summer and Winter limits were re-evaluated by Technical Services using these revised assumptions. The results of a Level C analysis are listed below: Assuming D.O. = 6.0 mg/1 : BOD5 NH3N Assuming D.O. = 7.0 mg/1 : BOD5 NH3N Summer Winter 5.0 mg/1 3.0 mg/1 6.0 mg/1 3.0 mg/1 9.0 mg/1 6.0 mg/I 10.0 mg/1 6.0 mg/1 As is evident in the results, the additional dissolved oxygen in the effluent will not provide very much relief in the BOD5 and NH3N limits. This may be attributed to the high carbonaceous deoxygenation rate used in the model (K1 = 1.5/day). This rate was determined back in 1976 when the model was calibrated. At that time, Henderson possessed File January 23, 1986 - page two - only a secondary treatment facility and a pickle factory was discharging upstream of them. The pickle factory no longer discharges, and Henderson's system has since been upgraded to an advanced treatment facility. It is very likely that the current rate of deoxygenation is less than 1.5 per day. However, there may be other influences on D.O. in Nutbush Creek, particularly from algal growth and respiration, that are not accounted for in the existing model. At this point in time, rather than arbitrarily lowering the model's carbonaceous decay rate, I recommend using the existing model in order to be consistent with past assessments. Accordingly, an intensive survey has been tentatively planned for this summer for the purpose of model recalibration. 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Nutbush Creek -- QUAL-II a) 4.6 mile Segment upstream of Kerr Lake b) Henderson WWTP (4.14 MGD) Heinz Industries (no longer discharging) c) Current Limits for Henderson: Summer Winter BOD5 5 mg/I 5 mg/1 NH3N 3 mg/1 12 mg/1 DO 6 mg/1 6 mg/1 TSS 30 mg/1 30 mg/1 Fecal 1000//00 mi 1000/100 ml pH 6-9 SU 6-9 SU d) Model developed with information collected in 1975 and 1976.