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Home My WebLink AboutNC0071773_Wasteload Allocation_19891009DIVISION OF ENVIRONMENTAL MANAGEMENT October 9, 1989 Memorandum To: Jim Johnston From: Carla Sanderson C- Through: Tom Stocktonf#3 Subject: Forbush High School Discharge Location NPDES Permit No. NC0071773 Yadkin County I am responding to your inquiry sent September 27, 1989, requesting new limits for the proper location of Forbush High School's discharge. A wasteload alloca- tion request was received in July, 1987 for the existing unpermitted discharge of Forbush High School into an unnamed tributary (UT) to Forbush Creek. The USGS flow estimates for the UT give a drainage area of 0.14 square miles with the average flow equal to 0.14 cfs and the 7Q10 and 30Q2 both equal to zero. Therefore, the limits given for this location of discharge were 5(10) mg/1 BODS, 2(4) mg/l NH3N, and 6 mg/l DO for summer (winter). Your recent request has the discharge on Forbush Creek as the correct location. The USGS flow estimates on Forbush Creek give a drainage area of 21.2 square miles with the average flow equal. to 21.0 afs, and the 7Q10 equal to 1.7 cfs. A Leve'•-P.. model hos.ba�n developed for the discharge into Forbush Creek and the limits are as follows: 94asteflow 0.015 MGD BODS 30 mg/1 TSS 30 mg/1 Fecal Coliform 200/100ml pH 6-9 SU Please note that the above are proposed limits resulting from a speculative wasteload allocation analysis. A formal application for an NPDES permit modifi- cation needs to be submitted to our permitting unit before any modification of this permit can be finalized. Please let me know if you have any further questions concerning this matter. cc: Steve Mauney Dale Overcash a, 0 V 0 as aj c Facility Name: Existing Proposed NPOES WASTE LOAD ALLOCATION d Date: ' .2 %- Permit No.: AICOO 7l %rf 3 Pipe No. d County _ s Design Capac i ty (MOD) : & ndus t ria l ('; of Flow )—.� � • �Domestic (X of Flow) : .� Class : Sub -Basin: Q �X-- Referencei;S;;S quad: �-'�4ST %fie(Please attach) � Re� ., !te AV ,�estor : IsC. Regional of f ice ems* d (Guideline limitations, if applicable, are to — be listed on the back of this form. )— Des i gil Tc.-:r . ►..• Drainage .area: Avg, Streamflow: Winter 30Q2: ._o;.a:.o:: o: D. min ot,; ou- _ 4__) Sicpe: (basr_ e= , per K3 (base e, per day 200C) . , .10 C.lc t fluent Monthly 1 racteristics� average• Conents Original "Mocati.or. El Revised Allocation Date(s) of Revision(s) (Please attach previous allocation) Prepa: ed By: Reviewed By : ------- Date: .Ly.• �- >� -95 930 dob goo +� Ord - _i�c I \ � ��'\v\/jti� \ � I ✓�� 1�� i -- =--� i I i 699can � I ��oo-�— Chgartown ck �� 9 � n \�� i••teMtZon \� \� � -�/ J 1_ �� M 864 ° II''J Ir u 535 s36 1530000 FEET 35' 538 s 39 !FARM/NGTONI ed by the Geological Survey �j oeaa /, SE leer-S * I i SCALE e1:24000 methods from aerial MN checked 1966 L 1000 0 1000 2000 3oao 4000 cN � CC IV 5 0 •th American datum �-- I Carolina coordinate system 53 M�Ls o•!s - Mercator grid ticks. SMILs CONTOUR INTERVAL 20 FEE Fov bv5t& IT gk c-x.l oo u-bt5 n Crns ?b1c,Ig` 030rloa wa6blo(Ad o_(lo(&4Wy- �T25� Loa5 IVUGtVej vw 'Ile -i,�m..�fi� � Cv-P-r-� .S� �, �6 f � f�• �en�ova.0 pp �./.�a�,-.�� T�j -�t&4 (-a'7-81) a �,ccJ h��yuPsttvllvv r'�bV�ecf �oC C�v R� di 56�e (Ah �rhus� '1�'�ScJrov�e Pf A4- a1 �yow-�S• q �u�It�4 Zu I I s, .-1 t o '97 0,4 al•�1,wwZz 0/4=a1.06.5 �0b' 1.-7C� 1owV 5 l71 4e,4 VA= 0•Qn"'a 664P2.1)55058o ().4',25.1 r� ---- Q4' ,9 ens w'L.d 68 . VV yio5_o �t TI �j i i + � � G-A — -- -- 'c .2.o - 09 , 0 ? t -29 .2 +,5-. I � 1I I -----tom=a1 t7_tru _ _ 5 UIJ goto _pU�+�- Lw h A; St anc.G ' SUMMER MODEL RUN WITH SECONDARY LIMIT ON FORBUSH CREEK ---------- MODEL RESULTS ---------- Discharger : FORBUSH HIGH SCHOOL Receiving Stream : FORBUSH CREEK ---------------------------------------------------------------------- The End D.O. is 7.78 mg/l. The End CBOD is 1.90 mg/l. The End ---------------------------------------------------------------------- NBOD is 1.33 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 ------ 7.34 ---------------- 0.00 1 ---- ---- -- ---------- Reach 1 45.00 90.00 0.00 0.01500 Reach 2 0.00 0.00 0.00 0.00000 Reach 3 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger : FORBUSH HIGH SCHOOL Subbasin : 030702 Receiving Stream : FORBUSH CREEK Stream Class: C Summer 7Q10 : 1.7 Winter 7Q10 : 5.4 Design Temperature: 25. ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/mil fps I ft Idesignl @2014 Idesignl @2034 Idesignl Segment 1 I I 1 0.901 I 10.801 0.129 I 1 0.95 I I 1 0.29 10.23 I I 1 2.79 1 I 2.501 I 0.44 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 I 1 Segment 1 I I 1 0.251 I 10.801 0.131 I 1 0.97 I I 1 0.29 1 0.23 I I 1 2.85 1 I 2.561 I 0.44 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.001 I 10.80I 0.135 I 1 0.99 I I 10.29 10.23 I I 1 2.92 1 I 2.621 I 0.44 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD 1 D.Q. 1 I cfs I mg/1 I mg/1 I mg/1 I Segment 1 Reach 1 Waste 1 0.023 145.000 190.000 I 0.000 Headwatersl 1.700 1 2.000 1 1.000 1 7.440 Tributary 1 0.000 I 2.000 1 1.000 I 7.440 * Runoff 1 0.060 I 2.000 I 1.000 I 7.440 Segment 1 Reach 2 Waste I 0.000 I 0.000 1 0.000 I 0.000 Tributary I 0.070 I 2.000 I 1.000 I 7.440 * Runoff I 0.060 I 2.000 I 1.000 I 7.440 Segment 1 Reach 3 Waste I 0.000 I 0.000 I 0.000 I 0.000 Tributary 1 0.090 I 2.000 I 1.000 1 7.440 * Runoff I 0.060 I 2.000 I 1.000 1 7.440 * Runoff flow is in cfs/mile T I Seg # I Reach # I Seg Mi I D.O. ( CBOD 1 1 0.00 7.34 2.58 1 1 0.09 7.37 2.55 1 1 0.18 7.41 2.51 1 1 0.27 7.44 2.48 1 1 0.36 7.46 2.45 1 1 0.45 7.49 2.42 1 1 0.54 7.51 2.38 1 1 0.63 7.53 2.35 1 1 0.72 7.55 2.32 1 1 0.81 7.57 2.29 1 1 0.90 7.59 2.26 1 2 0.90 7.59 2.25 1 2 0.95 7.60 2.24 1 2 1.00 7.61 2.22 1 2 1.05 7.62 2.21 1 2 1.10 7.63 2.19 1 2 1.15 7.64 2.18 1 3 1.15 7.63 2.17 1 3 1.25 7.65 2.14 1 3 1.35 7.67 2.11 1 3 1.45 7.68 2.08 1 3 1.55 7.70 2.06 1 3 1.65 7.72 2.03 1 3 1.75 7.73 2.00 1 3 1.85 7.74 1.98 1 3 1.95 7.76 1.95 1 3 2.05 7.77 1.92 1 3 2.15 7.78 1.90 I Seg # I Reach # I Seg Mi I D.O. I CBOD SUMMER MODEL RUN WITH SECONDARY LIMIT ON FORBUSH CREEK I NBOD I Flow I 2.20 1.72 2.16 1.73 2.11 1.73 2.07 1.74 2.03 1.74 1.99 1.75 1.95 1.76 1.91 1.76 1.87 1.77 1.83 1.77 1.80 1.78 1.76 1.85 1.75 1.85 1.73 1.85 1.71 1.86 1.69 1.86 1.67 1.86 1.64 1.95 1.61 1.96 1.57 1.96 1.54 1.97 1.51 1.98 1.48 1.98 1.45 1.99 1.42 1.99 1.39 2.00 1.36 2.01 1.33 2.01 I NBOD Flow I