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HomeMy WebLinkAboutNC0020231_WASTELOAD ALLOCATION_19910513NPDES DOCUMENT SCANNIM& COVER STET 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: May 13, 1991 Thfs c1ot3umeat is priutea ou muse paper - ignore sa-y coateut ou the re -terse Bide NPDES WASTE LOAD ALLOCATION PERMIT NO.: NCO020231 PERMITTEE NAME: Town of Louisburg / Louisburg WWTP Facility Status: Existing Permit Status: Modification/Upgrade Major -4 Minor Pipe No.: 001 Design Capacity: 1.5 MGD Domestic (% of Flow): 71 % -219 Industrial (% of Flow): 29 % 41 17 Nth G. Comments: �11�oD oDs Requestfor a flow increase from 1 1MGD to 1.5 MGD Previously94%o domestic 6% industrial RECEIVING STREAM: Tar River Class: WS-III NSW Sub -Basin: 03-03-01 Reference USGS Quad: C25SE, Louisburg (please attach) County: Franklin Regional Office: Raleigh Regional Office _ Previous Exp. Date: 6/30/91 Treatment Plant Class: III Classification changes within three miles: None within 3 mi. Requested by: _ Angela Y. Griffin Date: Prepared by: AJ Date: u Reviewed by: Date: 1� �O i� � 28 • S CS)/�j� � bit) LZ&,0eL, — rl Modeler Date Rec. # Drainage Area (miz) 3 Avg. Streamflow (cfs):_4,1,0 7Q10 (cfs) 14 Winter 7Q10 (cfs) 4b 30Q2 (cfs)_ Toxicity Limits: IWC 1:1 % Acute/ hron c Instream Monitoring: Pf F Parameters DO RC -AL car,. r0&-1)VTerry Upstream Location A7 WsT- IDo' uPsrme+AA_ Downstream Location (A) A?PX • 5.7s znwN s (15) RPPx• 17.9 u(LEs LbWN5T2r1LM Effluent Characteristics Summer Winter BOD5 (MO 10 Z� NH3-N (mg/1) D.O. (mg/1)r TSS (mg/1) 30 o F. Col. (/100 ml) 2,00 pH (SU) i P -rrN C LviWj e Zg Olt, 142wtse 3o CraxLYb k,EAD (µ`xi MoN i T-6 fZ 1W C � -1- <e Yc FACT SHEET FOR WASTELOAD ALLOCATIONS Facility Name :Louisburg WWTP NPDES No. :NC0020231 Type of Waste :>90% domestic/<10o Facility Status :Existing Permit Status :Modification Receiving Stream :Tar River Stream Classification:WS-III, NSW Subbasin :030301 County :Franklin Regional Office :RRO Requestor :A. Griffin Date of Request :3/25/91 Topo Quad :C25SE Wasteload Allocation Summary # 6152 iF 14?Cu57dIR _ PEIZ[.C+j7Ari6 GpMcs 7 to7� industrial jHeyF, WAAITS WOU.LV C4 is.,� �f Stream Characteristic'rl USGS # Dat icL�rainage Area: 437 sq.m Summer 7Q10: 14.0 cfs Winter 7Q10: 48.0 cfs :J,• Average Flow: 460.0 cfs 30Q2: cfs Louisburg WWTP has previously requested a flow increase to 1.1 MGD. A speculative for 1.5 MGD was performed at that time and the proposed limits were sent to the consultants. The proposed limits presented on this fact sheet are identical to those presented to the consultants. Technical Support recommends that an EA be performed before this permit goes to notice, due to the actual increase in flow of 0.8 to 1.5 MGD (we feel the facility may be skirting the EA issue by proposing flow increments that fall below the EA criteria). Louisburg WWTP is currently investigating their SIU's, so toxic limits may need to be implemented in the future. Not enough information exists at this time to determine if toxic limits are necessary. Jere 4teaAnein-{rrmfioh nee 5 10 A 60bn?1Aie%beA6e Ah o eA014516-;1 Recommended by: Date • S �{ Reviewed by Instream Assessment: Regional Supervisor: Permits & Engineering: l�G 1 Date: b r ff L'U Date: RETURN TO TECHNICAL SERVICES BY: MAY 1 7 5/3la! - FOu.N b kT F4t I Lt Ty t5 VO( N4 Fou 5T LT4(5 v"PUI-D codrr2 ► AJAT" AoJ EA ►,}ouLD} �}cSo, LpuisguQL1 is Pg2r o� TAR--PAAk BA5w A55,00ATI©n) - TOO AO OAVe T46 oPrtoN nr M ,,,iq —(w8 5Tn_ler. TP/TAI Emirs o2 PU4Cd„%jS /VPS TRftDt,4c OP-ria). SOG .�FF� �ettcR�� �ow5 i� MST 0Fid"rtJt S aF j�R��2E�TMrn1 i Su2V� -2- Existing Limits Wastef low (MGD): BOD5 (mg/1): NH3N (mg/1): DO (mg/1) : TSS (mg/1): Fecal Coliform (/100 ml): PH ( SU) : Recommended Limits CONVENTIONAL PARAMETERS Ar" V'-%' - T Monthly Average Summer/Winter 0.8 30/30 5/5 30/30 200/200 Monthly Average Summer/winter 7r tscl c, Daily Maximum 6-9 Daily Maximum Wasteflow (MGD): 1.5 BODS (mg/1): 10/26 NH3N (mg/1): 3/4 DO (mg/1) : 5/5 TSS (mg/1): 30/30 Fecal Coliform (/100 ml): 200/200 PH (SU): 6-9 TP (mg/1): 2/2 TN (mg/1) : 4/8 Tot. Res. Chlorine (ug/1): 28 Oil&Grease (mg/1): 30 60 Lead: MONITOR Toxicity: Chronic Q P/F at 14% ( B 9bCa- F-N_D IIn,.t►rH Ng-rft6 CI) Cr, Cu, kj ��n, GJ Limits Changes Due To: Parameter(s) Affected Chlorine Nutrient Sensitive Waters TP,TN New model �j , ///(60 0.1'd vj/P-6�1&m s/011 ) Note: for winter limits, it is possible that the facility may have BOD5=30, NH3-N=2.7 mg/1 if this is more feasible. INSTREAM MONITORING REQUIRMENTS: DO, Fecal coli, temperature, conductivity Upstream: y Location: at least 100 ft. upstream Donwstream: y Location: (A) appx. 5.7 miles downstream (B) appx. 7.9 miles downstream Special Instream monitoring locations or monitoring frequencies: Two monitoring sites are recommended per 1.1 MGD WLA. (i.e. the possibility of a second DO sag downstream of the first site) 8/89 Facility Name Loul4auR4 lA W W Pernlit # h400zo Z31 CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY) The effluent discharge shall at no time exhibit chronic toxicity in any two consecutive toxicity tests, using test procedures outlined in: 1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay Procedure - Revised *June 1988) or subsequent versions. The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality is -L4 -% (defined as treatment two in the North Carolina procedure document). The permit holder shall perform quarterlx monitoring using this procedure to establish compliance with the permit condition. The first test will be performed after thirty days from issuance of this permit during the months of 5 SF P lV . Effluent sampling for this testing shall be performed at the NP ES permitted final effluent discharge below all treatment processes. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Environmental Management P.O. Box 27687 Raleigh, N.C. 27611 Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will revert to quarterly in the months specified above. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid test and will require immediate retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute noncompliance with monitoring requirements. 7Q 10 14 . o cfs Permited Flow 1.5 MGD IWC% [4-. ZZ Basin & Sub -basin o 1 Receiving Stream _JA2 gW County FAAAjy-uel Recommended by. - Date *Chronic Toxicity (Ceriodaphnia) P/F at%, N. 5E�. D� 11e, See Part 3 , Condition. Facility L-cu,5au,j24 Lk)vr"p WastefIow'(MGO) I < S- Burgher/hinter (circle one) - - E Lr izQ C7 CO ly E Nv j3-1 - C,3 ? I z 3 ¢ �` 6 NH3-N (mg/ H Potential effluent limit combinations: C 300 BOD5 7.5 5 5� 10 Zl NH3•N - N'�vr' 4 r� 3 13, 5 2 � ;FACILITY NAME: i i REQUESTER: r NPDES PRMZFATMENT INFORMATION REQUEST ;F'ORM L,O U ISS u27� WW7-P NPDES NO. ` NCO 0 AN6H-A- 7 IR1M&j DATE: 3 / -+/ q J .RDGiON: Z 0 2 3 1 �-}- r This facility has no SIUs and should not have pretreatment Language. This facility should and/or is developing a pretreatment program. Please include the following conditions: •� Program Development Phase I due Phase II due Additional Conditions (attached) This facility is currently implementing a pretreatment program. Please include the following conditions: Program Implementation Additional Conditions (attached) r r r SIGNIFICANT INDUSTRIAL USERS' (SIUs) CONTRIBUTIONS SIU FLOW -- TUTAL: MGD r r r r COMPOSITION: TEXTILE: : MGD METAL FINISHING: MGD k OTHER: MCD MGD j MGD MGD r r r r r HEADWORKS REVILV r k5: Cd Cr Ni Pb Zn CN Phenol Other PASS ,THROUGH DAILY LOAD IN LBS/DAY ACTUAL ALLOWABLE DOMESTIC PERMITTED INDUSTRIAL % REMOVAL • r«M-4 �r • Sri - �'!� Ob SUMMER BOD5=10, NH3-N=3, D.O.=5.0 SUMMER ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ----------------------------------------------------------------------- The End D.O. is 5.18 mg/l. The End CBOD is 1.43 mg/l. The End ---------------------------------------------------------------------- NBOD is 0.48 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 5.04 5.70 3 Reach 1 15.00 13.50 5.00 1.50000 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 4 . *** MODEL SUMMARY DATA *** Discharger : LOUISBURG WWTP Subbasin : 030301 'Receiving Stream : TAR RIVER Stream Class: WS-III Summer 7Q10 : 14.0 Winter 7Q10 : 48.0 Design Temperature: 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 @2014 Idesignl @2034 Idesignl Segment 1 I I 1 0.801 I 1.481 0.132 I 1 2.87 I I 10.27 1 0.20 I I 1 0.29 1 I 0.251 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 0.132 I 1 2.89 I I 10.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach -------------------------------------------------------------------------------- 2 1 1 1 1 l 1 1 1 1 1 Segment 1 I l 1 3.901 1 1.481 0.133 I 1 2.91 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.261 I 0.48 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 1 Segment 1 I I I 1.301 I 1.481 0.132 I 1 2.92 I I 1 0.27 1 0.20 I I 1 0.29 1 I 0.251 I 0.48 1 Reach --------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 I Flow I I cfs I Segment 1 Reach 1 Waste 1 2.325 I Headwatersl 14.000 1 Tributary 1 0.000 I * Runoff 1 0.000 I Segment 1 Reach 2 Waste I 0.000 Tributary I 0.200 * Runoff I 0.000 Segment 1 Reach 3 Waste I 0.000 Tributary I 0.300 * Runoff I 0.000 Segment 1 Reach 4 Waste I 0.000 Tributary 1 0.000 * Runoff I 0.000 CBOD I NBOD I D.O. I mg/l I mg/l I mg/1 l 15.000 1 13.500 1 5.000 2.000 1 1.000 1 7.300 2.000 1 1.000 1 7.300 2.000 1 1.000 1 7.300 0.000 1 0.000 I 0.000 2.000 1 1.000 I 7.300 2.000 1 1.000 1 7.300 I 0.000 1 0.000 1 0.000 I 2.000 1 1.000 1 7.300 I 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 SUMMER BOD5=10, NH3-N=3, D.0.=5 Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD j Flow 1 1 0.00 6.97 3.85 2.78 16.32 1 1 0.08 6.90 3.81 2.73 16.32 1 1 0.16 6.83 3.78 2.68 16.32 1 1 0.24 6.76 3.74 2.64 16.32 1 1 0.32 6.69 3.70 2.59 16.32 1 1 0.40 6.62 3.66 2.55 16.32 1 1 0.48 6.56 3.63 2.50 16.32 1 1 0.56 6.49 3.59 2.46 16.32 1 1 0.64 6.43 3.56 2.41 16.32 1 1 0.72 6.37 3.52 2.37 16.32 1 1 0.80 6.32 3.49 2.33 16.32 1 2 0.80 6.33 3.47 2.31 16.52 1 2 0.90 6.26 3.42 2.26 16.52 1 2 1.00 6.19 3.38 2.21 16.52 1 2 1.10 6.13 3.34 2.17 16.52 1 2 1.20 6.07 3.30 2.12 16.52 1 2 1.30 6.01 3.26 2.07 16.52 1 2 1.40 5.95 3.22 2.03 16.52 1 2 1.50 5.89 3.18 1.98 16.52 1 2 1.60 5.84 3.14 1.94 16.52 1 2 1.70 5.79 3.10 1.90 16.52 1 2 1.80 5.74 3.06 1.86 16.52 1 2 1.90 5.70 3.02 1.82 16.52 1 2 2.00 5.65 2.99 1.78 16.52 1 2 2.10 5.61 2.95 1.74 16.52 1 2 2.20 5.57 2.91 1.70 16.52 1 2 2.30 5.53 2.88 1.66 16.52 1 2 2.40 5.49 2.84 1.63 16.52 1 2 2.50 5.46 2.80 1.59 16.52 1 2 2.60 5.42 2.77 1.56 16.52 1 2.70 5.39 2.74 1._52 16.52 1 _2 _-- 3 2.70 5.43 -- -__- 2 72- 1.51 16.82y 1 3 3.00 5.34 2.62 1.42 16.82 1 3 3.30 5.27 2.53 1.33 16.82 1 3 3.60 5.20 2.43 1.24 16.82 1 3 3.90 5.15 2.35 1.16 16.82 1 3 4.20 5.11 2.26 1.09 16.82 1 3 4.50 5.08 2.18 1.02 16.82 1 3 4.80 5.06 2.10 0.95 16.82 1 3 5.10 5.05 2.02 0.89 16.82 1 3 5.40 5.04 1.95 0.84 16.82 1 3 5.70 5.04 1.88 0.78 16.82 1 3 6.00 5.04 1.81 0.73 16.82 1 3 6.30 5.05 1.74 0.69 16.82 1 3 6.60 5.07 1.68 0.64 16.82 1 4 6.60 5.07 1.68 0.64 16.82 1 4 6.70 5.07 1.66 0.63 16.82 1 4 6.80 5.08 1.64 0.62 16.82 1 4 6.90 5.09 1.62 0.60 16.82 1 4 7.00 5.09 1.60 0.59 16.82 1 4 7.10 5.10 1.58 0.58 16.82 1 4 7.20 5.11 1.56 0.56 16.82 \1 4 7.30 5.12 1.54 0.55 16.82 1 4 7.40 5.13 1.52 0.54 16.82 1 4 7.50 5.14 1.50 0.53 16.82 1 4 7.60 5.15 1.48 0.52 16.82 1 4 7.70 5.16 1.46 0.50 16.82 1 4 7.80 5.17 1.44 0.49 16.82 1 4 7.90 5.18 1.43 0.48 16.82 Seg # I Reach # I Seg Mi D.O. CBOD NBOD Flow i Qi4C-fZ Po55113L& WW IC-2 L AA 1 1-5 WINTER QEFF=1.5 MGD, BOD5=30 MG/L NH3-N=2.7, DO=5 MG/L ---------- MODEL RESULTS ---------- Discharger : LOUISBURG WWTP Receiving Stream : TAR RIVER ---------------------------------------------------------------------- The End D.O. is 8.67 mg/l. The End CBOD is 3.05 mg/l. The End ---------------------------------------------------------------------- NBQD is 1.12 mg/l. WLA WLA WLA DO Min CBOD NBQD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) Segment 1 8.67 7.90 4 Reach 1 45.00 12.20 5.00 1.50000 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 : LOUISBURG WWTP Subbasin : 030301 Receiving Stream : TAR RIVER Stream Class: WS-ITT Summer 7Q10 : 14.0 Winter 7Q10 : 48.0 Design Temperature: 14.0 ILENGTHI SLOPEI VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN -------------------------------------------------------------------------------- I mile I ft/mil .fps I ft Idesigni @20;� Idesignl @2014 Idesignl Segment 1 I I 1 0.801 I 1.481 0.307 I 1 3.31 I I 1 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach -------------------------------------------------------------------------------- 1 I I I I I I I 1 I I Segment 1 I I 1 1.901 I 1.481 0.309 I 1 3.33 I I 1 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach --------------------------------------------------------------------------------- 2 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 3.901 I 1.481 0.311 I 1 3.35 I I 1 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach -------------------------------------------------------------------------------- 3 1 1 1 1 1 1 1 1 1 1 Segment 1 I I 1 1.301 I 1.481 0.309 I 1 3.36 I I 1 0.16 1 0.21 I I 1 0.35 1 I 0.401 I 0.19 1 Reach --------------------------------------------------------------------------------- 4 1 1 1 1 1 1 1 1 1 1 I Flow I CBOD I NBOD I D.O. I I cfs 1 mg/l I mg/l l mg/l I Segment 1 Reach 1 Waste 1 2.325 145.000 112.200 I 5.000 Headwatersl 48.000 1 2.000 1 1.000 1 9.280 Tributary 1 0.000 I 2.000 I 1.000 1 9.280 * Runoff I 0.000 I 2.000 1 1.000 1 9.280 Segment 1 Reach 2 Waste 1 0.000 I 0.000 I 0.000 I 0.000 Tributary I 1.100 I 2.000 I 1.000 I 9.280 * Runoff I 0.000 I 2.000 I 1.000 1 9.280 Segment 1 Reach 3 Waste I 0.000 1 0.000 I 0.000 I 0.000 Tributary 1 0.920 I 2.000 I 1.000 I 9.280 * Runoff I 0.000 I 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 1 0.150 1 2.000 1 1.000 1 9.280 * Runoff 1 0.000 1 2.000 1 1.000 1 9.280 WINTER QEFF=1.5 MGD, BOD5=30 MG/L NH3-N=2.7, DO=5 MG/L Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 1 1 0.00 9.08 3.99 1.52 50.33 1 1 0.08 9.07 3.98 1.51 50.33 1 1 0.16 9.07 3.97 1.51 50.33 1 1 0.24 9.06 3.96 1.50 50.33 1 1 0.32 9.05 3.95 1.50 50.33 1 1 0.40 9.04 3.94 1.49 50.33 1 1 0.48 9.04 3.93 1.49 50.33 1 1 0.56 9.03 3.92 1.49 50.33 1 1 0.64 9.02 3.91 1.48 50.33 1 1 0.72 9.02 3.90 1.48 50.33 1 1 0.80 9.01 3.89 1.47 50.33 1 2 0.80, 9.01 3.85 1.46 51.43 1 2 0.90 9.01 3.83 1.46 51.43 1 2 1.00 9.00 3.82 1.45 51.43 1 2 1.10 8.99 3.81 1.45 51.43 1 2 1.20 8.98 3.80 1.44 51.43 1 2 1.30 8.97 3.79 1.44 51.43 1 2 1.40 8.97 3.77 1.43 51.43 1 2 1.50 8.96 3.76 1.42 51.43 1 2 1.60 8.95 3.75 1.42 51.43 1 2 1.70 8.94 3.74 1.41 51.43 1 2 1.80 8.93 3.73 1.41 51.43 1 2 1.90 8.93 3.72 1.40 51.43 1 2 2.00 8.92 3.70 1..40 51.43 1 2 2.10 8.91 3.69 1.39 51.43 1 2 2.20 8.91 3.68 1.39 51.43 1 2 2.30 8.90 3.67 1.38 51.43 1 2 2.40 8.89 3.66 1.38 51.43 1 2 2.50 8.89 3.65 1.37 51.43 1 2 2.60 8.88 3.64 1.37 51.43 1 2 2.70 8.87 3.62 1.36 51.43 1 3 2.7-Q 8.88 3.60 --1-3-6-----52:35`-- 1 3 3.00 8.86 3.56 1.34 52.35 1 3 3.30 8.84 3.53 1.33 52.35 1 3 3.60 8.83 3.50 1.31 52.35 1 3 3.90- 8.81 3.46 1.30 52.35 1 3 4.20 8.80 3.43 1.28 52.35 1 3 4.50 8.78 3.40 1.27 52.35 1 3 4.80 8.77 3.37 1.25 52.35 1 3 5.10 8.76 3.34 1.24 52.35 1 3 5.40 8.74 3.30 1.2.3 52.35 1 3 5.70 8.73 3.27 1.21 52.35 1 3 6.00 8.72 3.24 1.20 52.35 1 3 6.30 8.71 3.21 1.19 52.35 1 3 6.60 8.70 3.18 1.17 52.35 1 4 6.60 8.70 3.18 1.17 52.50 1 4 6.70 8.70 3.17 1.17 52.50 1 4 6.80 8.70 3.16 1.16 52.50 1 4 6.90 8.69 3.15 1.16 52.50 1 4 7.00 8.69 3.14 1.15 52.50 1 4 7.10 8.69 3.13 1.15 52.50 1 4 7.20 8.69 3.12 1.15 52.50 1 4 7.30 8.68 3.11 1.14 52.50 1 4 7.40 8.68 3.10 1.14 52.50 1 4 7.50 8.68 3.09 1.13 52.50 1 4 7.60 8.67 3.08 1.13 52.50 1 4 7.70 8.67 3.07 1.12 52.50 1 4 7.80 8.67 3.06 1.12 52.50 1 4 7.90 8.67 3.05 1.12 52.50 I Seg # I Reach # 1 Seg Mi I D.O. I CBOD j NBOD I Flaw I