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Home My WebLink AboutNC0020231_INSTREAM ASSESSMENT_19910419NPDES DOCUMENT SCANNING COVER SHEET NPDES Permit: NC0020231 Louisburg WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Data Monitoring Report Speculative Limits Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: Aril 19, 1991 z12" aooumest IM p3r1JMt 3& 4MR1 xkeuMe paper - ignare any cantAWnt 4CWIM t kXa JMW*M!� $ide DIVISION OF ENVIRONMENTAL MANAGEMENT April 19, 1991 To: Tim Donnelly From: Susan A.-WiIs6n) Through: Trevor Clements mil. Ruth C. Swanek S ' Carla Sanderso Subject: Instream Assessment Town of Louisburg NPDES Permit No. NCO020231 Franklin Countya Summary and Re.: SOC No. 90-05 Recommendations Technical Support has received a second request for an instream assessment for the Town of Louisburg and has completed the review of the Tar River Wastewater Treatment Plant (WWTP). Louisburg has requested modification of its BOD5, TSS, D.O., and whole effluent toxicity limits. With this new instream assessment, the Raleigh Regional Office requested a lower BOD5 limit based on recent compliance data. Currently, the permitted flow for Louisburg is 0.8 MGD, with the facility averaging 0.5958 MGD into the Tar River. The facility has approached or exceeded its permitted limits in the past due to inflow/infiltration problems. The Town wishes to increase its flow under the Order during the construction of the upgraded WWTP. An instream assessment was performed tp determine if the proposed BOD5 limit, as well as the originally proposed DO limit, would protect;against further degradation of the stream according to 67(b) criteria. The modeling analyses for this assessment predicted dissolved oxygen levels to drop below 3 mg/1 downstream of the-di�chirge for both the pre- and post-SOC flow. EPA Criteria Document for DU indicates -that th�-threshold- for the -protection of fish -survival is approximately 3.0 MO. Increased amounts of wasteflow are expected to drive the stream to more frequent violations of the dissolved oxygen threshold for which aquatic life experience mortality. The results of the analyses indicate that the Town may add 42,300 gallons per day of additional flow under the requested limits of BOD5 = 35 mg/l, TSS = 90 mg/l, and D.O. = 4 mg/l, without violating the stipulations of 67(b). EMC criteria state that no industrial sources should be added under an Order. DEM has interpreted this as "no toxics in toxic amounts". Therefore, it is recommended that this SOC be limited to domestic type waste additions only. Technical Support concurs with the Region's recommendation that no flow limit be included in the SOC due to the I/1 problems. Technical Support also recommends that the Town of Louisburg be granted its request for monitoring of whole effluent toxicity until June 30, 1991 as specified in the draft Order. The Town of Louisburg discharges into the Tar River, which is rated as a "WS-III, NSW" stream in the Tar River Basin. The drainage area at the point of discharge is 437 square miles. The 1986 USGS flows are as follows: 7Q10 = 14.0 cfs (summer), average stream flow = 460 cfs. The stream bed gradient at the point of discharge is 1.48 feet per mile. The plant has received a permit to expand to 1.1 MGD and may eventually expand to 1.5 MGD; the plant expansion to 1.1 MGD, would have to meet summer (winter) limits of 12 (24) mgll BOD5 and 4 (8) mg/1 N113-N. Both the renewal at 0.8 MGD and the expansion require Louisburg to perform an industrial waste survey to determine the need for a pretreatment program. The facility is currently required to conduct monthly acute full range toxicity tests (as required by Administrative letter). The facility has shown acute toxicity and will be required to conduct chronic quarterly pass/fail tests at 8% effluent upon renewal of their 0.8 MGD permit. A Level-B model was run with the limitations that Louisburg WWTP can achieve (i.e: BOD5 = 35 mg/1,M.O. = 4.0 mg/1), using their average effluent flow of 0.5958 MGD for the past year, as a baseline condition. The BOD5 and NH3-N parameters were input to the model as CBOD and NBOD'using multipliers of 1.5 for BOD5 and 4.5 for NH3-N. When these effluent characteristics were�input to the model, the predicted D.O. sag was 2.86 mg/1 at the 5.7 milepoint. It is very possible that during the SOC period, the D.O. may drop as low as or lower than 2.86 mg/1. Technical Support used the above baseline condition model run to compare to 0.0423 MGD increase in flow. The Level-B modeling analysis predicted that a total effluent flow of 0.6381 MGD with BOD5 = 35 mg/1 and D.O. = 4.0 mg/i, would meet the criteria. The D.O. was below the instream standard of 5 mg/1 for 11.86 miles during the pre-SOC flow; during the post-SOC flow (0.6381 MGD), the D.O. was below the standard for 11.96 miles. Therefore, the predicted increase in the length of the sag between pre- and post-SOC flow was calculated to be 0.10 miles (which is less than the 67(b) criteria of 0.5 miles). The net decrease in the predicted D.O. sag was found to be less than 0.5 mg/l, which also met the 67(b) criteria. cc: Steve Tedder Ken Eagleson Kent Wiggins Pretreatment ` TABLE 1. SUMMARY OF INSTREAM ASSESSMENT FOR LOUISBURG WWTP Headwater Conditions: 7Q10 (cfs) 14.0 Qavg (cfs) 460.0 Design Temperature (°C) 26.0 CBOD (mg/I) 2.0 NBOD (mg/1) 1.0 D.O. (mg/l) 7.3 Wastewater Inputs: Flows Pre -SOP Flow. 0.5958 MGD (past year average) Additional Flow 0.0423 MGD Post-SOCTIow 0.6381 MGD (although. SOC *ill not restrict to this because of. -TA problems) Wastewater Characteristics -- CBOD (1.5 * requested BOD5 limit) 52.5 mg/I NBOD (4.5 * existing NIJ3-N limit) 90.0 mg/l D.O. (requested limit) 4.0 mg/1 r Model Output Summary:: DO min. Net IChange Distance (mi) Net Change (mg/1) ( ng/1) t5.0 mg/l (mi) ---------- -�-------- ---------------- -------------- Pre-SOC 2.86 NA 11.86 NA Post-SOC 2.63 0.23 11.96 0.10 BRSE�-l� E Co�IT�o�1 SUMMER QEFF=0.5958 MGD, BOD5=52.5, DO=4 MG/L ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ----------------------------------------------------------------------- The End D.O. is 6.32 mg/l. The End CBOD is 0.74 mg/l. The End ---------------------------------------------------------------------- NBOD is 0.22 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 2.86 5.70 3 Reach 1 52.50 90.00 4.00 0.59580 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 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 D.O. SA( 1-�rTq = 13.0(o - I,Z = I(,8(- &,GEs D,0. /- 5-1 t *** MODEL SUMMARY DATA *** Discharger Receiving Stream : Summer 7Q10 Design Temperature: LOUISBURG WWTP Subbasin : 030301 TAR RIVER Stream Class: WS-III 14.0 Winter 7Q10 : 48.0 26.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/miI fps I ft Idesignl @203h Idesignl @2014 Idesignl Segment 1 I I 1 0.801 I 1.481 0.123 I 1 2.84 I I 1 0.27 1 0.20 I I 10.27 1 I 0.241 I 0.48 1 Reach -------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.901 I 1.481 0.123 I 1 2.86 I l 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach ---------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 0.124 I 1 2.88 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 1 1 1.301 I 1.481 0.123 I 1 2.89 I I 1 0.27 1 0.20 l I 1 0.27 1 1 0.241 I 0.48 1 Reach ---------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 I 1 1 Segment 1 I I 1 8.601 I 1.561 0.145 I 1 3.04 I I 1 0.27 1 0.20 I I 1 0.34 1 I 0.291 I 0.48 1 Reach --------------------------------------------------------------------------------- 5 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.551 I 1.561 0.156 I 1 3.15 I I 1 0.27 1 0.20 I I 1 0.36 1 I 0.321 I 0.48 1 Reach -------------------------------------------------------------------------------- 6 1 1 1 1 1 1 1 1 1 1 I Flow I cfs Segment 1 Reach 1 Waste 1 0.923 Headwatersl 14.000 Tributary 1 0.000 * Runoff 1 0.000 Segment 1 Reach 2 Waste 1 0.000 Tributary 1 0.200 * Runoff 1 0.000 Segment 1 Reach 3 Waste 1 0.000 Tributary 1 0.300 * Runoff 1 0.000 I CBOD I NBOD I D.O. I mg/l I mg/1 I mg/l I 1 52.500 1 90.000 1 4.000 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 1 0.000 1 0.000 1 0.000 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 1 0.000 1 0.000 1 0.000 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 5 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 4.700 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 6 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary I 3.200 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff flow is in cfs/mile SUMMER QEFF=0.5958 MGD, BOD5=52.5, DO=4 MG/L Seg # I Reach # 1 Seg Mi I D.O. I CBOD I NBOD I Flow I 1 1 0.00 7.10 5.13 6.51 14.92 1 1 0.08 6.93 5.07 6.39 14.92 1 1 0.16 6.77 5.02 6.27 14.92 1 1 0.24 6.62 4.96 6.15 14.92 1 1 0.32 6.47 4.91 6.03 14.92 1 1 0.40 6.32 4.86 5.92 14.92 1 1 0.48 6.18 4.81 5.81 14.92 1 1 0.56 6.04 4.76 5.70 14.92 1 1 0.64 5.90 4.71 5.60 14.92 1 1 0.72 5.77 4.66 5.49 14.92 1 1 0.80 5.65 4.61 5.39 14.92 1 2 0.80 5.67 4.57 5.33 15.12 1 2 0.90 5.52 4.51 5.21 15.12 1 2 1.00 5.37 4.45 5.08 15.12 1 2 1.10 5.23 4.39 4.97 15.12 1 2 1.20 5.10 4.33 4.85 15.12 4.97 4.28 4.74 15.12 1 2 1.40 4.85 4.22 4.63 15.12 1 2 1.50 4.73 4.16 4.52 15.12 1 2 1.60 4.61 4.11 4.41 15.12 1 2 1.70 4.50 4.06 4.31 15.12 1 2 1.80 4.40 4.00 4.21 15.12 1, 2 1.90 4.30 3.95 4.11 15.12 1 2 2.00 4.20 3.90 4.02 15.12 1 2 2.10 4.11 3.84 3.92 15.12 1 2 2.20 4.02 3.79 3.83 15.12 1 2 2.30 3.94 3.74 3.74 15.12 1 2 2.40 3.86 3.69 3.66 15.12 1 2 2.50 3.78 3.65 3.57 15.12 1 2 2.60 3.71 3.60 3.49 15.12 1 2 2.70 3.64 3.55 3.41 15.12 1 3 2.70 3.71 3.52 3.36 15.42 1 3 3.00 3.52 3.38 3.13 15.42 1 3 3.30 3.37 3.25 2.92 15.42 1 3 3.60 3.24 3.12 2.72 15.42 1 3 3.90 3.13 3.00 2.54 15.42 1 3 4.20 3.04 2.89 2.36 15.42 1 3 4.50 2.97 2.77 2.20 15.42 1 3 4.80 2.92 2.66 2.05 15.42 1 3 5.10 2.89 2.56 1.91 15.42 1 3 5.40 2.87 2.46 1.78 15.42 1 3 5.70 2.86 2.37 1.66 15.42 1 3 6.00 2.87 2.27 1.55 15.42 1 3 6.30 2.89 2.18 1.45 15.42 1 3 6.60 2.91 2.10 1.35 15.42 1 4 6.60 2.91 2.10 1.35 15.42 1 4 6.70 2.92 2.07 1.32 15.42 1 4 6.80 2.93 2.04 1.29 15.42 1 4 6.90 2.95 2.02 1.26 15.42 1 4 7.00 2.96 1.99 1.23 15.42 1 4 7.10 2.97 1.96 1.20 15.42 1 4 7.20 2.99 1.94 1.17 15.42 1 4 7.30 3.00 1.91 1.14 15.42 1 4 7.40 3.02 1.89 1.12 15.42 1 4 7.50 3.04 1.86 1.09 15.42 1 4 7.60 3.05 1.84 1.06 15.42 1 4 7.70 3.07 1.81 1.04 15.42 1 4 7.80 3.09 1.79 1.02 15.42 1 4 7.90 3.11 1.77 0.99 15.42 1 5 7.90 4.09 1.82 0.99 20.12 1 5 8.76 4.24 1.65 0.84 20.12 1 5 9.62 4.42 1.50 0.70 20.12 1 5 10.48 4.60 1.36 0.59 20.12 1 5 11.34 4.80 1.23 0.50 20.12 1 99 1.12 0.92 20.12 1 5 13.06 .-19� 1.01 0.35 20.12 1 5 13.92 5.38 0.92 0.30 20.12 1 5 14.78 5.57 0.83 0.25 20.12 1 5 15.64 5.75 0.76 0.21 20.12 1 5 16.50 5.92 0.69 0.18 20.12 1 6 16.50 6.11 0.87 0.29 23.32 1 6 16.65 6.13 0.85 0.28 23.32 1 6 16.81 6.15 0.84 0.27 23.32 1 6 16.96 6.18 0.82 0.27 23.32 1 6 17.12 6.20 0.81 0.26 23.32 1 6 17.27 6.22 0.80 0.25 23.32 1 6 17.43 6.24 0.79 0.24 23.32 1 6 17.59 6.26 0.77 0.24 23.32 1 6 17.74 6.28 0.76 0.23 23.32 1 6 17.90 6.30 0.75 0.22 23.32 1 6 18.05 6.32 0.74 0.22 23.32 Seg # I Reach # 1 Seg Mi I D.O. I CBOD I NBOD I Flow fLow AP7iT1oN -OF:' 47-, 300 4vv SUMMER QEFF=0.6381 MGD, BOD5=52.5, DO=4 MG/L ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER __--------------------------------------------------------------------- The End D.O. is 6.26 mg/l. The End CBOD-is 0.75 mg/l. The End NBOD is 0.22 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 2.63 5.70 3 Reach 1 52.50 , 90.00 4.00 0.63810 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 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 -DAM c 51A AFreg-&1C& iti LENL10 OF 4kC FeoM 6A5CLiNF_ C0N)jTI0N5 lka(o 0,1 0.1 So 6-7(b) GR+7cmiq 15 NOT VIOLATED Tj� FFra GE DD, SACS --� Z•B�- 2.c"3 = 0,Z3 M�/J. �D.Z3 n/L o S ��1.� sv (,, 7(b) CCITEEiA 15 Nor MLA i iiM) *** MODEL SUMMARY DATA *** Discharger Receiving Stream Summer 7Q10 Design Temperature: LOUISBURG WWTP Subbasin : 030301 TAR RIVER Stream Class: WS-III 14.0 Winter 7Q10 : 48.0 26.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I -------------------------------------------------------------------------------- I mile I ft/mil fps I ft. Idesignl @20;� Idesignl @2014 Idesignl Segment 1 I I 1 0.801 I 1.481 0.124 I 1 2.84 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach ------------------------------------------------_-------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.901 I 1.481 0.124 I 1 2.86 I I 1 0.27 1 0.20 1 I 1 0.27 1 I 0.241 I 0.48 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 0.125 I 1 2.88 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach --------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.301 I 1.481 0.124 I 1 2.89 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach ---------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 8.601 I 1.561 0.146 I 1 3.04 I I 1 0.27 1 0.20 I I 1 0.34 1 I 0.301 I 0.48 1 Reach' -------------------------------------------------------------------------------- 5 1 1 1 1 1 1 1 1 1' 1 Segment 1 I I 1 1.551 I 1.561 0.157 I 1 3.15 I I 1 0.27 1 0.20 I I 1 0.36 1 I 0.321 I 0.48 1 Reach --------------------------------------------------------------------------------- 6 1 1 1 1 1 1 1 1 1 1 I Flow I cfs Segment 1 Reach 1 Waste 1 0.989 Headwatersl 14.000 Tributary 1 0.000 * Runoff 1 0.000 Segment 1 Reach 2 Waste 1 0.000 Tributary 1 0.200 * Runoff 1 0.000 I CBOD I NBOD I D.O. I I mg/1 I mg/l I mg/1 I 1 52.500 1 90.000 1 4.000 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 1 0.000 1 0.000 1 0.000 1 2.000 1 1.000 1 7.300 1 2.000 1 1.000 1 7.300 Segment 1 Reach 3 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.300 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 5 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 4.700 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.01)0 1 7.300 r Segment 1 Reach 6 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 3.200 1 2.000 1 1.000',1 7.300 * Runoff 1 0.000 1 2.000 1 1.000!r 7.300 * Runoff flow is in cfs/mile ,1 SUMMER QEFF=0.6381 MGD, BOD5=52.5, DO=4 MG/L Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow 1 1 0.00 7.08 5.33 6.87 14.99 1 1 0.08 6.91 5.28 6.74 14.99 1 1 0.16 6.74 5.22 6.62 14.99 1 1 0.24 6.58 5.16 6.50 14.99 1 1 0.32 6.42 5.11 6.37 14.99 1 1 0.40 6.27 5.06 6.26 14.99 1 1 0.48 6.12 5.00 6.14 14.99 1 1 0.56 5.97 4.95 6.02 14.99 1 1 0.64 5.83 4.90 5.91 14.99 1 1 0.72 5.69 4.85 5.80 14.99 1 1 0.80 5.56 4.79 5.69 14.99 1 2 0.80 5.58 4.76 5.63 15.19 1 2 0.90 5.43 4.69 5.50 15.19 1 2 1.00 5.27 4.63 5.37 15.19 1 2 1.10 5.13 4.57 5.25 15.19 "1� 1.20 4 . 8- 4.51 5.13 15.19 1 2 1.30 4.85 4.45 5.01 15.19 1 2 1.40 4.72 4.39 4.89 15.19 1 2 1.50 4.59 4.34 4.78 15.19 1 2 1.60 4.47 4.28 4.67 15.19 1 2 1.70 4.36 4.22 4.56 15.19 1 2 1.80 4.25 4.17 4.45 15.19 1 2 1.90 4.14 4.11 4.35 15.19 1 2 2.00 4.04 4.06 4.25 15.19 1 2 2.10 3.94 4.00 4.15 15.19 1 2 2.20 3.85 3.95 4.05 15.19 1 2 2.30 3.76 3.90 3.96 15.19 1 2 2.40 3.68 3.85 3.87 15.19 1 2 2.50 3.60 3.80 3.78 15.19 1 2 2.60 3.52 3.75 3.69 15.19 1 2 2.70 3.45 3.70 3.60 15.19 1 3 2.70 3.52 3.66 3.55 15.49 1 3 3.00 3.33 3.52 3.31 15.49 1 3 3.30 3.16 3.38 3.09 15.49 1 3 3.60 3.02 3.25 2.88 15.49 1, 3 3.90 2.91 3.13 2.69 15.49 1 3 4.20 2.82 3.01 2.50 15.49 1 3 4.50 2.74 2.89 2.33 15.49 1 3 4.80 2.69 2.78 2.18 15.49 1 3 5.10 2.65 2.67 2.03 15.49 1 3 5.40 2.63 2.57 1.89 15.49 1 3 5.70 2.63 2.47 1.76 15.49 1 3 6.00 2.63 2.37 1.64 15.49 1 3 6.30 2.65 2.28 1.53 15.49 1 3 6.60 2.67 2.19 1.43 15.49 1 4 6.60 2.67 2.19 1.43 15.49 1 4 6.70 2.69 2.16 1.40 15.49 1 4 6.80 2.70 2.13 1.36 15.49 1 4 6.90 2.71 2.10 1.33 15.49 1 4 7.00 2.72 2.08 1.30 15.49 1 4 7.10 2.74 2.05 1.27 15.49 1 4 7.20 2.75 2.02 1.24 15.49 1 4 7.30 2.77 1.99 1.21 15.49 1 4 7.40 2.79 1.97 1.18 15.49 1 4 7.50 2.80 1.94 1.16 15.49 1 4 7.60 2.82 1.92 1.13 15.49 1 4 7.70 2.84 1.89 1.10 15.49 1 4 7.80 2.86 1.87 1.08 15.49 1 4 7.90 2.88 1.84 1.05 15.49 1 5 7.90 3.91 1.88 1.04 20.19 1 5 8.76 4.07 1.70 0.88 20.19 1 5 9.62 4.26 1.55 0.74 20.19 1 5 10.48 4.45 1.40 0.62 20.19 1 5 11.34 4.66 1.27 0.52 20.19 1 5 6 1 5 0.44 20.19 1 5 13.06 5.07 1.05 0.37 20.19 1 5 13.92 5.27 0.95 0.31 20.19 1 5 14.78 5.46 0.86 0.26 20.19 1 5 15.64 5.65 0.78 0.22 20.19 1 5 16.50 5.83 0.71 0.19 20.19 1 6 16.50 6.03 0.89 0.30 23.39 1 6 16.65 6.06 0.87 0.29 23.39 1 6 16.81 6.08 0.86 0.28 23.39 1 6 16.96 6.10 0.84 0.27 23.39 1 6 17.12 6.12 0.83 0.27 23.39 1 6 17.27 6.14 0.82 0.26 23.39 1 6 17.43 6.17 0.80 0.25 23.39 1 6 17.59 6.19 0.79 0.24 23.39 1 6 17.74 6.21 0.78 0.24 23.39 1 6 17.90 6.23 0.77 0.23 23.39 1 6 18.05 6.26 0.75 0.22 23.39 Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow t 3.0� '| ~ |f�-��«� �7� � %J,~_ ~� - -- ---' ---~- ---- ' - -- '- ' --- -- -- - -47- -' - ---------"-'�7 ---------- - '-' -- - - -' , lip ---- ' - - ----- - --' ----'- -- - -- - - -- - - - -'-- ' ------- --- _----- --_ ---_- now APD+rkiN oP ' q0, 000 SPD N -re: 9" "�� pQp2"� W I L L SUMMER jv-r LPr Lctxt5bNaq A17P 7H[9 NCH FLDW' DO=4 MG/L58 MGD, BOD5=52.5, ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ---------------------------------------------------------------------- The End D.O. is 6.18 mg/1. The End CBOD is 0.77 mg/1. The End NBOD is 0.23 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 2.36 5.70 3 Reach 1 52.50 90.00 4.00 0.68580 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 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 Imo,. 35 - I, I = 12., Z5 N,L-F-'5 'D,0, Z- 5 ^j /t DiFFE,ZWce PJ Lg,J► TP Ar &5eQtJE CaIVDtT10d ' 12.zs-{.�� 0.39 C 3°► c D. 5 so 0(b) Cr-JT&LIA IS, MCr) D.O. SAr DE r-E2GA1Ls � 2.5 � - 2 , 36 = 0. g PIA C �7 b,) cW re4ti A 15, & 61-) *** MODEL SUMMARY DATA *** Discharger : Receiving Stream ; Summer 7Q10 Design -Temperature: LOUISBURG WWTP Subbasin : 030301 TAR RIVER Stream Class: WS-III 14.0 Winter 7Q10 :.48.0 26.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN -------------------------------------------------------------------------------- I mile I ft/mil fps I ft Idesignl @2041 Idesignl @2034 Idesignl Segment 1 I I 1 0.801 1 1.481 ., 0.124 I` 1 2.84 I I 1 0.27 1 0.20 1 I 1 0.27 1 I 0.241 I 0.48 1 Reach --------------------------------------------------------------------------------- 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.901 I 1.481 0.124 I 1 2.86 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach --------------------------------------------------------------__-_-------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 0.125 I 1 2.88 I I 1 0.27 1 0.20 I I 1 0.27 1 I 0.241 I 0.48 1 Reach -------------------------------------------------------------------------------- 3 1 I I I I I I I I I Segment 1 I 1 1.301 1.481 0.124 1 2.89 1 0.27 1 0.20 1 0.27 1 0.241 0.48 1 Reach --------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 8.601 I 1.561 0.146 I 1 3.04 I I 1 0.27 1 0.20 I I 10.34 1 I 0.301 I 0.48 1 Reach -----------------------------------------------------------------------7-------- 5 1 1 1 1 1 I I 1 1 1 Segment 1 I I 1 1.551 I 1.561 0.157 I 1 3.16 I I 1 0.27 1 0.20 I I 1 0.36 1 I 0.321 I 0.48 1 Reach -----_----------------------------------------------------------------------------- 6 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD I D.Q. I I cfs I mg/l I mg/1 I mg/l I Segment 1 Reach 1 Waste 1 1.063 1 52.500 1 90.000 1 4.000 Headwatersl 14.000 1 2.000 1 1.000 1 7.300 Tributary 1 0.000 1 2.000 1 1.000 I 7.300 * Runoff 1 0.000 1 2.000 1 1.000 I 7.300 Segment 1 Reach 2 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.200 I 2.000 1 1.000 1 7.300 * Runoff 1 0.000 I 2.000 1 1.000 1 7.300 Segment 1 Reach 3 Waste I 0.000 1 0.000 1 0.000 1 0.000 Tributary I 0.300 1 2.000 1 1.000 1 7.300 * Runoff I 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 4 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 5 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 4.700 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 Segment 1 Reach 6 Waste 1 0.000 1 0.000 1 0.000 1 0.000 Tributary 1 3.200 1 2.000 1 1.000 1 7.300 * Runoff 1 0.000 1 2.000 1 1.000 1 7.300 * Runoff flow is in cfs/mile a SUMMER QEFF=0.6858 MGD, BOD5=52.5, DO=4 MG/L Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 1 1 0.00 7.07 5.56 7.28 15.06 1 1 0.08 6.89 5.51 7.15 15.06 1 1 0.16 6.71 5.45 7.01 15.06 1 1 0.24 6.54 5.39 6.88 15.06 1 1 0.32 6.37 5.33 6.75 15.06 1 1 0.40 6.21 5.28 6.63 15.06 1 1 0.48 6.05 5.22 6.51 15.06 1 1 0.56 5.90 5.17 6.39 15.06 1 1 0.64 5.75 5.11 6.27 15.06 1 1 0.72 5.61 5.06 6.15 15.06 1 1 0.80 5.47 5.00 6.04 15.06 1 2 0.80 5.49 4.96 5.97 15.26 1 2 0.90 5.32 4.90 5.83 15.26 1 2 1.00 5.16 4.84 5.70 15.26 1 2 1.10 5.01 4.77 5.57 15.26 1 2 1.26 4.86 4.71 5.44 15.26 1 2 1.30 4.71 4.65 5.31 15.26 1 2 1.40 4.58 4.59 5.19 15.26 1 2 1.50 4.44 4.53 5.07 15.26 1 2 1.60 4.32 4.47 4.95 15.26 1 2 1.70 4.20 4.41 4.84 15.26 1 2 1.80 4.08 4.35 4.72 15.26 1 2 1.90 3.97 4.29 4.62 15.26 1 2 2.00 3.86 4.24 4.51 15.26 1 2 2.10 3.76 4.18 4.40 15.26 1 2 2.20 3.66 4.13 4.30 15.26 1 2 2.30 3.57 4.07 4.20 15.26 1 2 2.40 3.48 4.02 4.11 15.26 1 2 2.50 3.39 3.96 4.01 15.26 1 2 2.60 3.31 3.91 3.92 15.26 1, 2 2.70 3.23 3.86 3.83 15.26 1 3 2.70 3.31 3.83 3.77 15.56 1 3 3.00 3.11 3.68 3.52 15.56 1 3 3.30 2.93 3.53 3.28 15.56 1 3 3.60 2.79 3.40 3.06 15.56 1 3 3.90 2.66 3.27 2.85 15.56 1 3 4.20 2.57 3.14 2.66 15.56 1 3 4.50 2.49 3.02 2.48 15.56 1 3 4.80 2.43 2.90 2.31 15.56 1 3 5-.10 2.39 2.79 2.16 15.56 1 3 5.40 2.37 2.68 2.01 15.56 1 3 5.70 C2.3-6� 2.58 1.88 15.56 1 3 6.00 2.37 2.48 1.75 15.56 1 3 6.30 2.38 2.38 1.63 15.56 1 3 6.60 2.41 2.29 1.52 15.56 1 4 6.60 2.41 2.29 1.52 15.56 1 4 6.70 2.42 2.26 1.49 15.56 1 4 6.80 2.43 2.23 1.45 15.56 1 4 6.90 2.45 2.20 1.42 15.56 1 4 7.'00 2.46 2.17 1.39 15.56, 1 4 7.10 .2.48 2.14 1'.35 15.56 1 4 7.20' 2.49.. 2.12 1.32 15.56 1'. 4 7.30 2.51 2.09 1.25 15.56 1 4 7.40, 2.5.3 2.06 1.2'6 15.'56 1 4 7.50 2.54 2.03 1.23 15.56 1 4 7.•60 2.56 2.01 1.20 15.56 1 4 7.70 2.58 1.98 1.18 15.56 1 4 7.80 2.60 1.95 1.15 15.56 1 4 7.90 2.62 1.93 1.12 15.56 1 5 7.90 3.71 1.94 1.09 20.26 1 5 8.76 3.88 1.76 0.92 20.26 1 5 9.62 4.07 1.60 0.78 20.26 1 5 10.48 4.28 1.45 0.65 20.26 1 5 11.34 4.50 1.32 0.55 20.26 1' 5 12.20 4.71 1.20 0.46 20.26 1 13.06 4.93 1.09 0.39 20.26 1 5 13.92 5.14 0.99 0.33 20.26 1 5 14.78 5.35 0.89 0.28 20.26 1 5 15.64 5.54 0.81 0.23 20.26 1 5 16.50 5.73 0.74 0.20 20.26 1 6 16.50 5.94 0.91 0.31 23.46 1 6 16.65 5.97 0.89 0.30 23.46 1 6 16.81 5.99 0.88 0.29 23.46 1 6 16.96 6.02. 0.87 0.28 23.46 1 6 17.12 6.04 0.85 0.27 23.46 1 6 17.27 6.06 0.84 0.27 23.46 1 6 17.43 6.09 0.82 0.26 23.46 1 6 17.59 6.11 0.81 0.25 23.46 1 6 17.74 6.13 0.80 0.24 23.46 1 6 17.90 6.16 0.79 0.24 23.46 1 6 18.05 6.18 0.77 0.23 23.46 Seg # I Reach # I Seg Mi I D.O. j CBOD I NBOD I Flow 7u1cRP�G�+F� K SD Do 5A; = 2, 3(v