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Home My WebLink AboutNC0021229_INSTREAM ASSESSMENT_19890901 WDES DOCYMEMT SCANNIMO COVER SMEET NPDES Permit: NCO021229 Old Fort WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Engineering Alternatives Analysis 201 Facilities-Plan / Instream Assessment (67B) Correspondence re: draft permit Permit History Date Range: Document Date: September 1, 1989 Thies document is printed on reuse paper-ignore any content on the reverse side DIVISION OF ENVIRONMENTAL MANAGEMENT March 9, 1989 MEMORANDUM TO: Forrest Westall FROM: Juan C. ManglesG THROUGH: David Vogt �^ J Trevor Clem nts Ken Eagleson y SUBJECT: Instream Assessment for the Town of Old Fort WWTP NPDES Permit NG0021229 McDowell County JOC Case No. 88-15 SUMMARY The Town of Old Fort has requested a first-time flow allocation under their current JOC. The impact of this flow increase on the water quality of Curtis Creek and the Catawba River was evaluated using the Lovel-B Model. The results of the analysis indicate that the requested flow increase will have very little additional impact on the receiving surface waters. Therefore, under-EMC -criteria, there is no basis for denying a 0.15 MGD flow increase. BACKGROUND INFORMATION The Town of Old Fort wastewater treatment plant discharges into Curtis Creek, at a site located 0.2 miles upstream from the confluence of Curtis Creek and the Catawba River. Both watercourses are classified "C-Trout" waters. Curtis Creek is characterized at the discharge point by the following: DA = 17 sq. miles; 7Q10 = 4. 1 cfs and Qavg = 29 cfs. The Town of Old Fort entered into a JOC on June 1, 1988 due to the noncompliance of their wastewater treatment facility with the final effluent limitations for BOD, TSS, Fecal Coliform, and Toxicity as set forth in the permit. A review of the self-monitoring data from July to December, 1988 indicates that the fari.lito has hAen 4n rnmpli.ance with the interim effluent limitations contained in the JOC. However, a review of the self-monitoring data for toxicity (Acute - monitoring only) from June, 1988 to January, 1989 indicated partial mortality in September, October and November, 1988. No mortality was reported in December, 1988 and Jan- nary, 1989. ANALYSIS AND DISCUSSION A Level-B analysis was performed using a wasteflow of 0.3362 MGD and the suggested .JOC limit of 80 mg/1. BOD,. Also, a NBOD value of 90 mg/l, reflecting a 20 mg/l NH„-N maximum, was used in the model. This assump- tion was based on the fact that ammonia concentrations during 1988 were reported to be 6.05 mg/l in average with a 41 .80 mg/1 maximum concentra- tion and a 0.06 mg/1 minimum concentration. DO was assumed 3.4 mg/l at the effluent, this is the minimum DO concentration reported in 1988. Streamflows were obtained from 1983 USGS records of Curtis Creek and from runoff calculations derived from 1982 records of nearby stations in the Catawba River. This model predicted that the instream DO sag (6.98 mg/1) occurs at the mix point. The second model run used the 0.3362 MGD flow plus the requested 0.15 MGD additional flow, with all other inputs constant. The results of the second model run predicted the DO minimum (6.81 mg/1) to be also at the mix point. A third model was run using various flow values to determine the maximum allowable wasteflow that satisfies EMC criteria. A maximum flow of 0.80 MGD (plant design capacity) predicted a DO sag of 6.50 mg/l at . the mix point. CONCLUSION In accordance with the EMC criteria for judging instream impacts, the model results demonstrate no significant depression of the instream DO level or extension of the zone of impact when the wasteflow is increased. cc: . Steve Tedder Kent Wiggins Steve Reid TABLE 1 . Instream Assessment Summary for the Town of Old Fort Wasteflow Assumptions Design Capacity 0.800 MGD Pre-JOC (01/88-12/88) 0.362 MGD Additional JOC Flow Requested +0. 150 MGD 0.512 MGD Maximum Allowable JOC Flow 0.800 MGD Model Input Summary - Headwater Conditions: 7010 4. 1 cfs Average Flow 29.0 cfs Design Temperature 25.0 C CBOD ?.0 mg/1 NBOD 1 .0 mg/1 DO 7 .4 mg/1 Wastewater Inputs: Flow See above CBOD (1 .5*recommended BOD,) 120.0 mg/1 NBOD (4.5*recommended NH,-N) 90.0 mg/1 DO 3.4 mg/l Model Output Summary Distance DO min. Net Change C 6.0 mg/l Net Change (mg/1) (mg/1) (mi) (mi) ----------------------- Pre-JOC 6.98 NA O.0 NA' W/ Current Request 6.81 - 0. 17 0.0 0.0 @ Maximum Allowable 6.50 - 0.48 0.0 0.0 • I= S Min State of North Carolina Department of Natural Resources and Community Development Asheville Regional Office James G. Martin, Governor S. Thomas Rhodes, Secretary DIVISION OF ENVIRONMENTAL MANAGEMENT WATER QUALITY SECTION February 15, 1989 MEMORANDUM TO: Trevor Clements Technical Services THROUGH: Forrest Westall Regional Wat Quality Supervisor FROM: Jim Reid mi Environment est � Br,a tPICF, SUBJECT: Initial JOC ow Allocation Request Town of Old ort NPDES Permit Number. NCO021229 McDowell County Please find attached an instream assessment request for The Town of Old Fort' s first flow allocation under their JOC. The Regional Staff desire toohave the assessment based upon 50, 000 gpd of domestic sewage with the expectation that that volume will be sufficient for the remaining term of the JOC. Also attached to 'the "Request for Instream Assessment" is the Town' s MP Printout for the past twelve months along with a copy of the effluent limitations page from the JOC. Thank-you for your help in this matter. Contact me at telephone number 704-251-6208, extension 291 if there are questions or if additional information is needed. JRR Interchange Building, 59 Woodfin Place, P.O. Box 370, Asheville, NC. 2 8 802-03 70•Telephone 704-2 5 3-3 3 41 An Equal Opportunity Affirmative Action Employer Request Form for In-stream Assessment for 67B NAME OF FACILITY_OIA[IV OT d��D�L`—______ SUBBASINC41 a3QUC3 COUNTY REGION_REGION_ (Z� _ DESIGN FLOW RECEIVING STREAM �Q IS CQee.k I I BACKGROUND DATA A . Why is SOC needed? (Facility is out of compliance with which effluent limits? =n��ial hoc -rlau, 0jleec,41vnl /2Pyues� 0 B . History of SOC requests . j1 . Monthly Average waste flow prior to any SOC _Q , 3�Z mgd r 2 . SOC flow added : Date : flow: _mgd Date : flow: Date : flow: _mgd total of previously approved SOC flow : mgd L :3 . Flows lost from plant flow: ��_mgd •1 . This SOC request flow : U, DS _mgd 5 . Total plant flow post-SOC (sum of original flow and SOC flow minus losses) flow: D, _76 2- mgd 6 . Is this an accurate flow balance for plant? Why./why not? l/ P 5 C . Please attach DMR summary for past year for all permitted parame- ters . If possible , include reports from previous years if facility has been under SOC for more than a year . THIS SOC A . Request is for domestic or industrial waste? If it is a combin- ation , please/ specify percentages . -Do MCSTic / B . What type of industry? Please attach any pertinent data. C . The region proposes the following SOC limits : BOD5 To mg/1 NH3 mg/l DO mg/1 TSS / ]S mg/1 fecal coliform /1(Q( $/100m1 pH__ l0 9 s U �OG /i.rr� T4 T%UNs d /Ho.✓> e1 .v7 ��,ieHrenfr v S e r; 030�3 S oc OIcQ Fr� �Jw CP Q ,= Cpe soc = o _ 336i N(+D) tI �1 ` 0 2 .�'s k00O '83 • I c � n L Q Y Z-40 y D 21 9s S , R2 \U As, .9 ` 0 QP : So � o2ij1$ i3oo 83 3og2-23 DA = s8 ID wlQ�o. \ S � ih 1q2= 2t � 3ogi ° 3b i 51tR\Oc \I e/ 0 2, QR = 117 '@'es DHSY..3D s S1Q\'J_'10 , w1�1�0'= 4l is � s � P N G N � w � � $� U I i .I elw dist' I — diat slo N\Ao O I . 1 3G:y Strea- m nste. m X BfanC �t SIoPe COL u lotion s --------------- ------------------ f4`l0 36 , �I 0 4J d I �oa -lev disc - --- dist sio strC4M M .1 nstem BCanCI> SIofe Co, culat'i0ns O g o 16 . 3 4 .q I f CC M o to N-un 1, 1 �- o � v :,----------- - l�l /mac L J \ 1 Li S 6 dicta,cc 'I 8.0 SZ ill O�1 / j `Ul CAD P - - 0. A ozo 4. 3 C,-S. CK � .90 Ii I� x 0 . 1 I! I { o. 336 2 Ilw p. 2 O. 4$62 _ IIC2A no O y.32 �IIv Sl �� 36. q n, 4 i I I 'I F[�T . SUMMER PRE-JOC ---------- MODEL RESULTS ---------- Discharger : TOWN OF OLD FORT Receiving Stream : CURTIS CR[EK ^ ______________________________________________________________________ The End D.O. is 7.67 mg/l . The End CBOD is 6.76 mg/l . The End NGOC is 4.51 mg/l . ______________________________________________________________________ WLA WLA WL,,"i DO Min CBOD NBOD DO Waste Flow (mg/1 ) Milepoint Reach # (mg/1 ) (mg/1 ) (mg/ 1 ) (mgd ) _.......... ........._ ____ ____ __ __________ Segment 1 6.98 0.00 J. Reach 1 120,00 90.00 3.40 0, 33620 Reach 2 0,00 0'00 0.00 0.00000 MODEL SUMMARY DATA Discharger . TOWN OF OLD FORT Eil_Ibbas:in ii3�80.) Receiving Stream : CURTIS iCREER:: Stream Class: C-TROUT Summer 701O e 4. 1 Winter 7010 SJegyU'i} le'177E'iF''i"cit.Ll1'"B; 25. ;LENGTH: SLOFE: 'lELO°..IT@ ; DEPTH: Kd , Kd , Ka , Ka , KN , KN : KNR 1 KNR , ; reile 1 ftlai: fps it ;design: 8200 :design: D20' :design; KO' :design; a20' 1 ----------------------------------------------------------------------------------------------------- Segment 1 , 0.201 36.40: 0.341 ; 035 ; OAS : OAS 4412 ; 213Y 0.73 ; 050 ; 003 ; OAO ; Reach1 ,----------------------------------------------------------------------------------------------------- Segment 1 0.901 117.401 0.342 ; 1.51 ; 0.34 ; 0.27 1 8.62 ; 7.73: 0.44 : 0.30 ; 0.44 1 0.00 ; Reach 2 ----------------------------------------------------------------------------------------------------- low C-R0D 1*4El01.) 13.0. cfs 1 ,mg/l 1 mg l 1 mg/1 , Segment. I Reach 1. Waste-: 1 0.521 : 1.20.000 , 90.O00 3.400 Headwaters ! 4 .. 1`0 1 2.000 1 1. .000 7.440 Tributary , 0.O00 1 2.000 1 1 .000 ; 7.440 k= Runoff 0.000 , 2.000 1 .000 7.440 Segment 1 React? 2 Tributary , 7 . 100 , 2.000 , 1. .000 , 7.440 r. Runoff flow is in c'1'slmile , " SUMMER' PRE-JOC | Seg # Reach Seg Mi 1 D.O. | CBOD | NGOD | Flow i 1 1 0. 00 6.98 15.31 11 .04 4 .62 J. 1 0. 10 7.22 15. 18 10.89 4.62 1 1 0. 20 7.38 15.05 10.75 4.62 1 2 0.20 7.42 7. 14 4.84 11 .72 1 2 0.30 7.46 7. 10 4 .81 11 .72 1 2 0./+0 7.50 7.06 4.77 11 .72 1 2 0.50 7 .53 7.01 4.73 11 .72 1 2 0.60 7.56 6.97 4.69 11 .72 1 p 0.70 7. 59 6. 73 4 ,66 11 .72 1 2 0.80 7.61 6.89 4.62 11 .72 1 2 0.90 7.63 6.84 4 .58 11 .72 1 2 1 .00 7.65 6.8O 4.55 11 .7.2' 1 2 1 . 10 7.67 6,76 4 .51 11 .72 | Seg # | Reach # 1 Seg Mi | D.O. | CBOD | NDOD | Flow | T2TpvFLO S U M 111ER NEW FLOW ----------- MODEL RESULTS -------------- Discharger : TOWN OF OLD FOF-:T Receiving Stream : CUETIS CREEK ---------------------------------------------------------------------- The End D.O. is 7.53 mg/l . The End 1CBOD is 8.81 mg/l . The End NBOD is 6.02 mg/l . -------------------------------------------------------------------...------------------------- WLA WLA WL..A DO Min C B 0 D N7:00 DO Waste Flow (mg/1 ) Mi. lel_oi.nt Reach 4 (m9/1 ) (mg/1 ) (mg/1. ) (m.gd ) Segment; 1 6.81 0.00 1 Reach 1 120.00 90 .00 3 .40 0 ,.4 B6K.J Reach 2 0.00 0.00 0.00 0.00000 J x MODEL S:iMMAFZY DATA ; Discharger ; TOWN OF OLD FORT Subt)asin O3083C? Receiving Stream . CURTIS CREEK Stream Class: C—TROUT Summer- 7010 4. 1 Winter 7010 Design Temperature: 25.. 1LENGTN: SLOPE: VELOCITY : DEP'T141 Y.d : lid 1 Ka : Ka , EN 1 KN : KNP : KNR , : mile : ft'mi: fps ft :design: 3201 :desiarc: 1201 :design! 220° :design: 3200 ----------------------------------------------------------------------------------------------------- : Segment 1 0.2:?t 36.40: 0.354 1 016 : 0AS 1 0.35 2525 1 MY 033 : ONO 1 173 1 OWO : ----------------------------------------------------------------------------------------------------- Segment 1 0.40: 17.40: 0.347 : i.S2 : 014 : 017 1 0.9 : E841 0.44 1 010 : OM 1 0&0 1 Reach 2 i i ----------------------------------------------------------------------------------------------------- Flow CDOD NMC)D D.O.. 1 [.fs mcg/I frig/1 i7igl Segment 1 Reach 1 Waste 1 0.754 1120.000 , 90.000 3.40C) Headwaters ! 4. 100 1 2.000 1 1. ..000 . 7.440 Tributary- O.000 1 2.000 , 1 .000 1 7 .440 Segment. 1 Reach L . i�_ : 00 Tributary 1 ! . 1(.:) � 2.000 1� 1. , 1 7.440 r i4 Runoff 1 0.000 1 E .000 1 1 .000 1 7.440 Runoff flow is in cfs/mile . SUMMER' NEW FLOW | Seg # | Reach # | Seg Mi | D.O. | CBOD | NBOD | Flow |6.81 20 32 14 82 4 85 1 1 0. 1O 7.05 20^ 15 14^^63 4` G5 � 1 ().2() 7. 20 19.99 144� 4 ^G5 1 2 0.20 7. 34 9^ �]0 6�^ 46 11 ^ 95 1 2 (). 30 7. 38 9 ^2�� 6 ^41 1195 4O 7 0 0. .� 9^^ 19 6^^ 3b 1 2 9 11 ^ 9� 1 2 0 50 743 ^ , ^ . 14 6 31 11 95 1 2 0^60 7.45 9.08 6^ 26� 2 370 ^ 7.47 9 03 6^^21 11 ^95 1 � 0.80 7.49 877 � 17 11 ^ 95 � 2 0.90 7.50 S.92 6 ^12 � 1 ^95 1 2 1 .00 7.52 8 86 6^ 07 11 ^ 75 � 1 2 1 . 10 7 .53 3 ^81 6 S ^O2 11 ^95 eg # � Reach 0 | Seg Mi | D.O. | CB` D | NB^ D | Flo^ | � | / 2 : :m+a MAX FLOW-- � §mrms ------ EL mwnwge: : TOWN OF OLDr+! Receiving Strea m : CURTIS mar ----------------------------------------------------------------------- ma End co. ls «ea q« . Thera emola m, » m« . The En, moors yoe ga . ----------------------------------------------------------------------- n W L A WL.A m m, CBOD mmo m Waste Flew :qg , m wnw. Reach # (mg/1 ) m,A , Ra« , ima , Segment ! 6.50 ^ ~ I Reach ! 120.00 90.00 mmo 0 .80000 Reach e am mm mm wem +..-x MODEL SUMMARY DATA, ..r:, Discharger . TOWN OF OLD SORT Subba-in O3O83O Receiving Stream v CURTIS CREEK Stream, Class : C--TROUT Summer 7010 : 4. 1 Winter 7010 DeO1lg'n lemPE:'.ratl_lre.- 25. ;LENSTW SLOPE; VELOCITY ; DEPTH; Kd ; Kd : Ka 1 Ka , K11 ; KH ; KHR ; KAR pile ; ft/ei1 fps : ft ;de=ion; 1-50 ;design; 320" :design; 3200 ;design; a201 ------------------------------------------------------------------------------------------------ , Segcent 1 0.20; 35.40; 0.330 017 1 0.50 ; OA9 1270 ; 24AII C73 ; 0.50 ; 013 ; 030 Reach 1 i i ----------------------------------------------------------------------------------------------------- Seocent 1 0.901 17.40; 0.357 ; 1.52 ; 015 ; 127 ; 931 ; S.OS; OA4 1 010 ; OA4 ; OA0 Reach 2 1 . ---------------------------------- 1=Io:v 1 CDOD 1 hlE3OD 1 D.O. 1 c'fs mg/1. ; mg/1 my Segment 1 Reach 1 - Waste 1 1 .240 11220.000 , 90.000 , 3.400 Headwaters! 4. 100 1 2.000 ; 1 .000 , 7.440 Tributary .44 0 Runoff 1 0 .000 , 2.000 ; 1 .000 , 7.440 Segment 1 Reach E Waste 1 O.000 , 0.000 0.000 O.000 Tributary 1 7. 1O0 , 2„000 , 1. .000 , 7.440 Runoff 1 0.000 . 2.000 1 1 .000 1 7.440 x Runoff flow is in cfs/mile �+ ^ . , ^ SUMMER . MAX FLOW | Seg # | Reach # | Seg Mi 1 D.O. CBOD NPOD | Flow | 1 1 0 .00 6.5() 29.40 21 .67 5.34 1 1 0. 10 6"74 29. 17 21 .41 5.34 1 1 0.20 6.90 28.93 21 . 16 5.34 1 2 0.20 7.21 13.56 9.65 12.44 1 2 C.30 7.22 13,48 9.58 12 .44 1 2 0,40 7.23 13.40 9.51 12.44 1 2 0.50 7 .23 13. 32 9.44 12.44 1 P 0.60 7.24 13.25 9.37 12.44 1 2 0.70 7,25 13. 17 9.30 12.44 1 2 0.80 7.26 13.07 9.23 12.44 1 2 0.90 7 .26 13.01 9. 16 12 .44 1 2 1 .0() 7.27 12.94 9 .09 12.44 1 2 1 . 10 7.28 12.86 9.02 12 .44 | Seg 4 1 Reach # | Seg Mi 1 D.O. < CBOD 1 NBOD | Flow | INSTREAM SELF-MONITORING DATA �+ MONTHLY AVERAGES Discharger : —I OwM g, OA—F r-� Permit No . : NC00 21229 Rece; vina Stream : Sub-basin : --------- Upstream Location Downstream Location Upstream Downstream DATE TEMP D . O . BOD5 COND . TEMP D . O . BOD5 COND _ Ei_-88 AUG-88 -- Li T UN-88 — MAY-88 — , DP_`O 'A7R-88 ..'EC-5�_ A U -°7 -- — -- — --- —— 87 - - - . -- - _- JSEC-86 NOV-86 EP-86 --- -- -- -- -- .":UG- -- JUL-86 _ ,71N-86 -- -- c;AY-86 — ?: R-86 —_— -- H,,R-8 6 --- -- --- = B-8 6 -- --- N-8 f; -- --- -- - ---- ---- D E C-8 5 — --- ---- -- - -- --- '.OV-85 CCT-85 _-- — -- -- SEP-85 -- -- AUG-85 -- -- --- —_ JUL-85 -- _— JUN-85 —_ 14AY-85 - - APR-85 MAP.-85 FEB-85 JAN-85