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HomeMy WebLinkAboutNC0024872_Speculative Limits_19920228NPDES DOCUMENT SCANNING COVER SHEET NC0024872 Cooleemee WWTP NPDES Permit: Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change 201 Facilities Plan Instream Assessment (67b) Speculative Limits V,ra no, Environmental Assessment (EA) Document Date: February 28, 1992 Thus document is printed on reuaae paper - ignore any content an the resrertise side %�cl.n�Es SPEC. Fog- 3.0 4 P State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27604 James G. Martin, Governor George T. Everett, Ph.D. William-W. Cobey, Jr., Secretary February 28, 1992 Director David M. Baird FBS, Ltd. One Centerview Drive Greensboro, NC 27407 Subject: Cooleemee WWTP NPDES No. NC0024872 Davie County Dear Mr. Baird: My staff has reviewed your request for speculative limits for a proposed expansion of the Davie County/Cooleemee WWTP from 1.5 MGD to 3.0 MGD. The Division is initiating a basinwide management strategy for the state. All NPDES permits within a given basin will be renewed in the same year allowing the Division to examine interaction among all point and non -point sources of pollutants for that basin. The basin plan for the Yadkin River Basin should be promulgated by 1998. In the meantime, discharge limits will be based on existing procedures. The speculative limits for 3.0 MGD will be: South Yadkin River summer/winter BODS (mg/1) 30/30 NH3-N (mg/1) 18.8/monitor DO (mg/1) monitor TSS (mg/1) 30/30 Fecal Coliform (#/100 ml) 200/200 pH (su) 6-9 Chlorine (mg/1) 28 Toxicity testing: Chronic quarterly P/F at 4.2% Current pretreatment information indicates that the facility may need a limit or monitoring requirement for cadmium, chromium, copper, nickel, lead, and zinc. As stated previously, this requirement will be based on the nature of the effluent and cannot be accurately assessed at this time. The Division encourages Davie County to take effective measures at this stage in order to meet better than secondary levels, due to the uncertain outcome of the Yadkin River Basin management plan. REGIONAL OFFICES Asheville Fayetteville Mooresville Raleigh Washington Wilmington Winston-Salem 704/251-6208 919/486-1541 704/663-1699 919/571-4700 919/946-6481 919/395-3900 919/896-7007 Pollution Prevention Pays P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer The facility should also be aware that the City of Salisbury has proposed a water supply intake on the Yadkin River, this may or may not have an effect on the proposed discharge limitations. Because Cooleemee WWTP may provide service to the City of Mocksville and the surrounding county upon expansion, the permit holder should be aware of general statute 143-215.22G & H regarding registration of water withdrawals and transfers of 1 MGD or greater. The Division of Water Resources can provide more detailed information regarding its potential effect, if any, on the proposal. Final limits will be provided upon receipt of an application for a NPDES permit. If you have any questions regarding the above issues, please contact Susan Wilson or myself at (919) 733-5083. ly, vor Clements tant Chief, Water Quality Section JTC/saw cc: Dale Overcash Steve Mauney FINKBEINER, PETTIS & STROUT, LIMITED CONSULTING ENGINEERS ESTABLISHED 1900 ONE CENTERVIEW DRIVE GREENSBORO, NC 27407 919-292-2271 919-855-5648 FAX FfS February 3, 1992 Mr. Trevor Clements NCDEHNR Division of Environmental Management Water Quality Section P.O. Box 29535 Raleigh, NC 27626 Dear Mr. Clements: RCP rIVED FEB 0 5 1992 SUrethiT BRANCH Re: Davie County, North Carolina Cooleemee WWTP We have been requested by Davie County to submit the following request for a waste load analysis to increase their existing wastewater treatment plant capacity from 1.5 MGD to 3.0 MGD. The existing Davie County wastewater treatment plant is located in Cooleemee and discharges into the South Yadkin River as shown on the enclosed map. This facility was originally constructed as a 3.0 MGD facility and served the Burlington Industries (formerly Erwin Mills) textile plant. Presently the wastewater treatment plant receives domestic wastewater from the Town of Cooleemee and 200,000 gpd of textile dye waste from Jockey International. The Jockey facility is permitted for 500,000 gpd. The expanded facility would be needed to serve additional industry that is considering locating in Davie County plus the possibility of providing service to additional areas of the county and to the City of Mocksville. The latter would result in the elimination of two existing wastewater treatment plants that serve Mocksville. We trust that the above information and the enclosed map allows you to determine if the capacity of the County's wastewater treatment plant can be increased to 3.0 MGD. Please feel free to call us or Mr. Bruce Pratt with Davie County at 704-634-5888 if you have any questions or if you need any additional information. DMB/ma Enclosure c: Mr. Bruce Pratt Sincerely, David M. Baird di I � I \C` y, j•t %p( M 72% J //,� ' )))'ii 4"' DAVIE COUNTY, NORTH CAROLINA COOLEEMEE WASTEWATER TREATMENT PLANT Finkbeiner, Pettis & Strout, Ltd. Greensboro, North Carolina 741) i ttI � 650— .fK • x64 y a� Cher' 75 rd SaCcucATide ,Jcco14457Z- ln1 2 tJ ,Q, , QEkr= C9? c, 412 .z-ND 7 C 3 % Pam z/92 036706 bP6sE Ira zc t 8g33o 1 0 ZgtoS=l�c(s 30E2 .- Zvi ntoN =171 VI% G3'z Cootg(arna W4;11) v _lt 9000c�0 83 *425. = (06, c-4 700,4 /f3c5-4— QPrti1 pQ2=22ge45 tw_c_' 4-h 11 Z Ta--'I 0rJ IZ. at.gt5v- efst._314-=f9.0-442- / QA9-fiq+ 161,0 ipt o 2l l e`j 3.�0/ ��o FGaws : 7plos y (.0 = 0,19 l(j>•ON Y` i - 0,3z 0/Gym-t,r3 309Z y1D = a.L3 L II�G�S AT pZl1 �o000o '63' __7.71(25_i.Y ' (711? 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To r cr412 M78yPie TOM tr E+)TK2S L(- t2.elr Mocsw I.LG aN t en ueErt - OM'S wrlerza -G,o-Leem ee -8 to 5, C ro. -BAu rzauW D) . t COLD REFS 02t 2.z ,G8 DA C4tt;t.tiS /we SlM! 791o, (_44C4s _1'42 OZIl89'ot 1 ) �4raw 444e-( Jj : 0,3 cis 3o c 2 = 3to c-1•y g63- [i%'# 64/ Stze 2,3 _ __-_7v0.5gpflfrq,_ga 4/ 1.1 e _ 4; 24 77 /&7PLOi 47pLa9/1 r SPEcu4-1.9-77✓e NCa72 7Z WN i leixto r ACiLtry /s 63 g t).01 /11 ?o in/P ‘42 Ngoi a-s 2,17 N3N- 45 2Arro wiq 5 Pc r tt1 eQ Mon /. 0N4 its eob �2ky5/ 5 6 ►/6/1(- .znr � . sue✓may r s 2odP (fitio6c6 ) e ? 7 35-17/E 446.N/02._ (atto Jftte ) 2 % 2e },tc, �Csv zE .f ej /LL BG f/1TPLC/�1�ALr5t) d ii/J e. l T of moN/roa_ PelRrnrrrL /1-01t 1?-6"tieNIT C� 47,6 CrII Ct,t frofi/foL MAS oN,[/F&� �Z-S4wCr ib twomt' - G/I*' Wai/ jNIJtiSTI(A GcS��SJ PA o TOIL �tcoNt TOP Sul ci 1 J I To 1 N bNt)Y Fo2 Cd, Cry Nam �b .t S1N-E A, ct.LowABC 1 � 11 A- tea:: SoD 4pp �I RoE-ts-15- No OAJ i -19-1 %I!i TR Cc Lft-%Z'cNTLA I Gagairty PA-55r N4 7 Xi i7y 7E-Sr5. 1. 7}Cr Ct Ty 6E, CAP- ?ri P/F >1-r ¢ 70 !Woct�D dc"Coru./ 6Nv ,�N__S7h&Rr4 /kohl TD,/4 &Cc i•SE_ aF MODEL RESULTS Discharger : COOLEEMEE Receiving Stream : S. YADKIN RIVER SUMMER QEFF=3.0 MGD, BOD5=30 MG/L NH;_tj = 18.8 ,11-Q.- The End D.O. is 6.85 mg/1. The End CBOD is 3.64 mg/1. The End NBOD is 3.00 mg/1. WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) Segment 1 6.79 2.20 1 Reach 1 68.10 84.60 0.00 3.00000 Reach 2 0.00 0.00 0.00 0.00000 SAYcD AS Cool, L. hl *** MODEL SUMMARY DATA *** RA C L (Lowu D CN E c -El) AT STAITi oiv D ZII Q, mcx, 0a IL Discharger : COOLEEMEE Subbasin : 030706 Receiving Stream : S. YADKIN RIVER Stream Class: C Summer 7Q10 :_106.0 Winter 7Q10 : 180.0 Design Temperature:�25.6) ILENGTHI SLOPE' VELOCITY 1 DEPTH) Kd 1 Kd 1 Ka 1 Ka 1 KN 1 I mile 1 ft/mil fps I ft Idesign l @204 Idesign l @204 Idesign' I 1 1 I 1 1 I I I Segment 1 1 2.201 2.301 0.561 1 3.64 1 0.27 1 0.22 1 1.27 I 1.141 0.44 Reach 1 1 1 1 1 I 1 I I I I I I I I I 1 I I Segment 1 1 2.051 2.301 0.629 1 3.96 1 0.27 10.22 1 1.42 1 1.271 0.44 Reach 2 I 1 1 I 1 1 1 1 I 1 Flow 1 CBOD 1 NBOD 1 D.O. I 1 cfs 1 mg/1 1 mg/1 1 mg/1 I Segment 1 Reach 1 Waste 1 4.650 1 68.100 1 84.600 I 0.000 Headwatersl106.000 I 2.000 I 1.000 1 7.4404-- Tributary 1 0.000 I 2.000 I 1.000 I 7.440 * Runoff I 0.940 1 2.000 I 1.000 I 7..440 Segment 1 Reach 2 Waste 1 0.000 I 0.000 1 0.000 1 0.000 Tributary 134.000 I 2.000 I 1.000 I 7.440 * Runoff 1 0.940 I 2.000 1 1.000 I 7.440 * Runoff flow is in cfs/mile SUMMER QEFF=3.0 MGD, BOD5=30 MG/L I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 1 1 0.00 7.13 4.78 4.51 110.65 1 1 0.22 7.08 4.74 4.46 110.86 1 1 0.44 7.04 4.71 4.41 111.06 1 1 0.66 7.01 4.67 4.35 111.27 1 1 0.88 6.97 4.64 4.30 111.48 1 1 1.10 6.93 4.60 4.25 111.68 1 1 1.32 6.90 4.57 4.20 111.89 1 1 1.54 6.87 4.53 4.15 112.10 1 1 1.76 6.84 4.50 4.10 112.30 1 1 1.98 6.81 4.46 4.05 112.51 1 1 2.20 6.79 4.43 4.00 112.72 1 2 2.20 6.94 3.87 3.31 146.72 1 2 2.41 6.93 3.84 3.28 146.91 1 2 2.61 6.92 3.82 3.24 147.10 1 2 2.82 6.91 3.80 3.21 147.30 1 2 3.02 6.90 3.78 3.18 147.49 1 2 3.23 6.89 3.75 3.15 147.68 1 2 3.43 6.88 3.73 3.12 147.87 1 2 3.64 6.87 3.71 3.09 148.07 1 2 3.84 6.87 3.69 3.06 148.26 1 2 4.05 6.86 3.66 3.03 148.45 1 2 4.25 6.85 3.64 3.00 148.65 I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 02/19/92 ver 3.1 T OXICS REVIEW Facility: cooleemee NPDES Permit No.: nc0024872 Status (E, P, or M) : p Permitted Flow: 3.0 mgd Actual Average Flow: 0.4413 mgd Subbasin: '030706 Receiving Stream: s. yadkin r. I PRETREATMENT DATA I----EFLLUENT DATA ---- Stream Classification: c I ACTUAL PERMITTEDI 7Q10: 106.0 cfs I Ind. + Ind. + I FREQUENCY IWC: 4.20 % I Domestic PERMITTED Domestic I OBSERVED of Chronic Stn'd / Bkg 1 Removal Domestic Act.Ind. Total Industrial Total I Eflluent Criteria Pollutant AL Conc. 1 Eff. Load Load Load Load Load 1 Conc. Violations (ug/1) (ug/1) 1 % (#/d) (#/d) (#/d) (#/d) (#/d) 1 (ug/1) (#vio/#sam) Cadmium S 2.0 I 92% 0.0100 0.0032 0.0132 4.1700 4.1800 1 I Chromium S 50.0 1 89% 0.0400 0.0032 0.0432 11.6800 11.7200 1 1 I Copper AL 7.0 I 90% 0.0800 0.0123 0.0923 5.8400 5.9200 1 1 N Nickel S 88.0 1 39% 0.1200 0.0041 0.1241 4.1700 4.2900 1 1 P Lead S 25.0 1 81% 0.1000 0.0083 0.1083 1.6700 1.7700 I 1 U Zinc AL 50.0 1 84% 0.3500 0.0496 0.3996 15.6400 15.9900 1 1 T Cyanide S 5.0 1 0% 1 I Mercury S 0.012 1 0% 1 1 S Silver AL 0.06 1 0% 1 1 E Selenium S 5.00 1 0% 1 1 C Arsenic S 50.00 1 0% 1 1 T Phenols S NA 1 0% 1 1 I NH3-N C 1 0% 1 1 0 T.R.Chlor.AL 17.0 1 0% 1 1 N Pollutant ALLOWABLE PRDCT'D PRDCT'D PRDCT'D MONITOR/LIMIT I--ADTN'L RECMMDTN'S-- Effluent Effluent Effluent Instream 1 Recomm'd Conc. using using Conc. Based on Based on Based on 1 FREQUENCY INSTREAM Allowable CHRONIC ACTUAL PERMIT using ACTUAL PERMITTED OBSERVED 1 Eff. Mon. Monitor. Load Criteria Influent Influent OBSERVED Influent Influent Effluent 1 based on Recomm'd ? (#/d) (ug/1) (ug/1) (ug/1) (ug/1) Loading Loading Data 1 OBSERVED (YES/NO) Cadmium S 1 14.38 47.591 Chromium S 1 261.42 1189.785 Copper AL 1 40.26 166.570 Nickel S 1 82.97 2094.022 Lead S 1 75.67 594.892 Zinc AL 1 179.72 1189.785 Cyanide S 1 2.88 118.978 Mercury S 1 0.01 0.286 Silver AL 1 0.03 1.428 Selenium S 1 2.88 118.978 Arsenic S 1 28.76 1189.785 Phenols S 1 0.000 NH3-N C 1 0.000 T.R.Chlor.AL 1 404.527 20.551 5.588 17.359 0.000 0.287 90.804 0.00 Limit 1 1 A 1.289 350.074 0.00 Limit 1 1 N 2.507 160.754 0.00 Monitor Monitor 1 1 A 710.603 0.00 Limit 1 1 L 91.320 0.00 Limit 1 1 Y 694.717 0.00 Monitor Monitor I 1 S 0.000 0.00 1 1 1 0.000 0.000 0.00 I 1 S 0.000 0.000 0.00 1 I 0.000 0.000 0.00 I I R 0.000 0.000 0.00 1 I E 0.000 0.000 0.00 I I S 0.00 1 1 U 0.00 I 1 L I I T I I S c 0 d c,3 S t r c ct nm : \fiftoic.v.1 2tve14- Cf0.-instcm fanck StoP e Caicu Ltion S i 0- 4- G u .r) ele.v disc' 0 GZo duSt SI of -41 st n 5. t1At L t A) la. N V1 G Co O 30706 North Carolina Division of Environmental Management Water Quality Section/Intensive Survey Group November 6, 1991 MEMORANDUM To: Ruth Swanek Through: Jay SauberJ , From: Howard Bryant /44441 Subject: Long-term BOD Analysis for Cooleemee WWTP (100%} County: Davie NPDES # NC0024872 Receiving Stream: South Yadkin River Sub -basin: 030706 cot. ¢`.4 ' ear; - 2�•3 ." DAY BM NH3-N TKN-N NOX-N TN-N 0 1.10 4.2 2.60 6.8 5 21.3 1.30 4.0 2.30 6.3 1 0 35.1 0.18 1.9 4.70 6.6 1 5 42.2 0.05 1 .7 4.70 6.4 20 47.1 2 5 49.5 3 0 51.6 0.04 3.1 4.60 7.7 35 53.6 40 55.2 50 57.8 6 0 59.7 0.04 1.2 5.50 6.7 70 60.1 80 61.3 9 0 62.5 0.03 1.1 5.10 6.2 Co o t, . poi) 60D,,,_ = S 9. ,4S Nao= 4,S , (FiNAL NOx - IN!Ttt,t_ Mcix) 4'5( S.I - 2,0 = i1.25 caov = "5-9.648 - 11. SS = Date Collected: June 13, 1991 1230-1230 Collected by: Knight pH:8.1 cc: Central Files Regional Water Quality Supervisor Test evaluation: -excellent Seeded: yes 3-vlAJ1 PJTlMer (S $C.d-etLEAT 14PC1(2kM No INFO 17ewNS►C- 1h1+ ON S. 7A701/41' storet.syaddo S M) utow2.0,4044 DATE 92/02/28 PGM=RET STORET RETRIEVAL 03460000 02118000 35 50 41.0 080 39 34.0 4 SOUTH YADKIN RIVER NEAR MOCKSVILLE, NC 37059 NORTH CAROLINA DAVIE SOUTHEAST 030706 YADKIN !TYPA/AMBNT/ 21 NC01 WQ 810207 HQ 03040102009 0001.000 OFF 0000 FEET DEPTH time body nh3-n do temp (c) 90/01 /03 1300 0.9 0.06 1 1 8 90/02/05 1055 9.2 10 90/03/05 1110 10 10 90/04/02 1210 0.2 0.03 8.4 17 90/05/01 1040 ( 8.2 I18 90/06/04 1005 8 21 90/07/09 1125 1.7 0.04 1, 93 7.2 23 90/08/01 1100 7.2 24 90/09/04 950 7.8 23 90/10/02 1140 1.1 0.05 , 9.2 17 90/1 1 /05 1035 8.8 14 90/12/03 1050 9.8 11 91 /01 /10 1155 0.4 0.08 10.4 8 91 /04/02 1125 1.4 0.01 9.2 14 91/05/01 1030 7.6 20 91/06/04 1115 7 23 91 /07/09 1145 2.1 0.05 -7,4) 6.8 24 91/08/06 955 6.8 25 91 /09/03 1200 7.8 21 91/10/07 1155 1.7 0.02 8.6 15, 91 /11 /04 1045 9.6 10 91/12/02 1115 8.2 16 92/01 /07 1200 0.5 0.01 9.8 9 THAT'S ALL FOLKS STORET RETRIEVAL DATE 92/02/28 clot = 2 2, );`3 A'num jr d ' o2,Lt,�� 30b5 N441:I.II PATh _ C6oip- 1.%a'1 V rAckSpoUNb D-k ._ 0"1-1444, - 6.04 N q;OA : 4.5 0.04 1,44- MZ)/L ZI NAUg4r'o41,Jb D.0' O'- Page 1 saw.syad2 STORET RETRIEVAL DATE 92/02/28 PGM=RET Q3460000 02118000 35 50 41.0 080 39 34.0 4 SOUTH YADKIN RIVER NEAR MOCKSVILLE, NC 37059 NORTH CAROLINA DAVIE SOUTHEAST 030706 YADKIN /TYPA/AMBNT/ 21 NCO1 WQ 810207 HQ 03040102009 0001.000 OFF 0000 FEET DEPTH DATE FROM TO depth tkn nox cond ni 90/01/03 1300 0.3 0.68 40 10K 90/02/05 1055 46 90/03/05 1110 46 90/04/02 1210 0.1 0.54 46 10K 90/05/01 1040 63 90/06/04 1005 54 90/07/09 1125 0.2 0.6 63 10K 90/08/01 1100 56 90/09/04 950 63 90/10/02 1140 0.2 0.53 52 10K 90/1 1 /05 1035 61 90/12/03 1050 51 91/01/10 1155 0.3 0.61 54 10K 91/04/02 1125 0.63 43 10K 5 -0- 91 /06/04 1115 57 91/07/09 1145 0.4 0.68 56 10K 91/08/06 955 55 91/09/03 1200 59 91/10/07 1 155 0.4 0.37 48 10K 91/11/04 1045 47 91/12/02 1115 59 92/01/07 1200 0.3 0.65 40 10K THAT'S ALL FOLKS STORET RETRIEVAL DATE 92/02/28 Page 1 WINTER QEFF=3.0 MGD, BOD5=30 MG/L MODEL RESULTS Discharger : COOLEEMEE Receiving Stream : S. YADKIN RIVER The End D.O. is 9.28 mg/l. The End CBOD is 3.09 mg/l. The End NBOD is 2.53 mg/1. WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) Segment 1 9.05 0.00 1 Reach 1 68.10 90.00 0.00 3.00000 Reach 2 0.00 0.00 0.00 0.00000 Av A S : Coo L Val *** MODEL SUMMARY DATA *** Discharger : COOLEEMEE Subbasin : 030706 Receiving Stream : S. YADKIN RIVER Stream Class: C Summer 7Q10 : 106.0 Winter 7Q10 : 180.0 Design Temperature: 14.0 'LENGTH' SLOPE' VELOCITY I DEPTH' Kd 1 Kd I Ka I Ka I KN I I mile I ft/mil fps I ft Idesign l @204 Idesignl @204 Idesign' 1 I 1 1 1 1 1 1 I Segment 1 1 2.201 2.30I 0.822 13.88 10.17 1 0.22 11.46 I 1.661 0.19 Reach 1 1 1 1 I I I 1 1 I 1 I I 1 1 1 1 1 I Segment 1 I 2.051 2.301 0.926 14.22 10.17 10.22 11.64 I 1.871 0.19 Reach 2 1 I 1 I I 1 1 1 I I Flow I CBOD I NBOD I D.O. I I cfs I mg/1 1 mg/1 I mg/1 I Segment 1 Reach 1 Waste I 4.650 1 68.100 1 90.000 I 0.000 Headwatersl180.000 I 2.000 I 1.000 I 9.280 Tributary I 0.000 1 2.000 1 1.000 I 9.280 * Runoff I 1.180 1 2.000 1 1.000 I 9.280 Segment 1 Reach 2 Waste I 0.000 I 0.000 I 0.000 1 0.000 Tributary 159.000 I 2.000 I 1.000 1 9.280 * Runoff 1 1.180 I 2.000 I 1.000 I 9.280 * Runoff flow is in cfs/mile WINTER QEFF=3.0 MGD, BOD5=30 MG/L I I Seg # I Reach # I Seg Mi 1 1 0.00 1 1 0.22 1 1 0.44 1 1 0.66 1 1 0.88 1 1 1.10 1 1 1.32 1 1 1.54 1 1 1.76 1 1 1.98 1 1 2.20 1 2 2.20 1 2 2.41 1 2 2.61 1 2 2.82 1 2 3.02 1 2 3.23 1 2 3.43 1 2 3.64 1 2 3.84 1 2 4.05 1 2 4.25 Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I 9.05 3.66 3.24 184.65 9.06 3.65 3.23 184.91 9.07 3.64 3.22 185.17 9.08 3.63 3.20 185.43 9.09 3.62 3.19 185.69 9.10 3.60 3.18 185.95 9.11 3.59 3.16 186.21 9.11 3.58 3.15 186.47 9.12 3.57 3.14 186.73 9.13 3.56 3.13 186.99 9.14 3.54 3.11 187.25 9.17 3.17 2.61 246.25 9.19 3.17 2.60 246.49 9.20 3.16 2.59 246.73 9.21 3.15 2.58 246.97 9.22 3.14 2.57 247.21 9.23 3.13 2.57 247.46 9.24 3.12 2.56 247.70 9.25 3.12 2.55 247.94 9.26 3.11 2.54 248.18 9.27 3.10 2.53 248.42 9.28 3.09 2.53 248.66 I D.O. I CBOD I NBOD I Flow I