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Home My WebLink AboutNC0021121_Wasteload Allocation_19931228NPDES WASTE LOAD ALLOCATION PERMIT NO.: NC0021121 PERMITTEE NAME: City of Mount Airy FACILITY NAME: Mount Airy WWTP Facility Status: _ Existing _ Permit Status: Renewal Major 14 Minor Pipe No.: 001 Design Capacity: 7.0 MGD Domestic (% of Flow): 56 % Industrial (% of Flow): 44 Comments: No PIRF yet (J. Poupart) 4,02^"J- -7/►/-It (am») RECEIVING STREAM: Ararat River Class: C Sub -Basin: 03-07-03 Reference USGS Quad: B 16 NE (please attach) County: Surry Regional Office: Winston-Salem Regional Office Previous Exp. Date: 6/30/94 Treatment Plant Class: Class 4 Classification changes within three miles: none within 3 miles Requested by: 'Susan Wilson jk� Date: 11/4/93 Prepared by: X_ U/. Lc/c4-, Date: z �� Reviewed by: Date: I34a Modeler Date Rec. # Drainagelrea (mi` ) ' 75 , Z- Avg. Streamflow (cfs): I a 7Q10 (cfs)_ (q ,g Winter 7Q10 (cfs) 3 1 30Q2 (cfs) Toxicity Limits: IWC % Acu hronic Instream Monitoring: Parameters a 1), 0. � L, cu i iw-m } com p uc , �yi y Upstream P. `I Location AT i,�s-r Ioo' UPSWC-AVA Downstream y Location')DOWN T'aQ4* �^ 1 AqLF e �RAPx. b n.�i �e�la cp�Y�er9N�:. �sT�WA €S BaFw r� alsN��lf.e b&"GuP «-.IGi ,� Characteristics Summer Winter BOD5 (m ) SO 3 � NH3-N (mg/1) D.O. (mg/l) rw��v i7o R- TSS (mg/1)0 3 F. Col. (/100 ml) Zoo ZQ Q pH (SU) 6 `1 6 - 7 c�� C�a asa %L (too i*1i aax� 30 CAQkIuM ()1�/2 07 4.7 Lait, f _- Q Zo 9 Sy 701,s Sq LYAAJ0e. Z ( Z WACU,41(� ta/L) 0,02$ ij, 02$ I h tv , ��/' �l,(i)-1 ✓lAt)j/ 4hfia4I// �ph� � Coloi lu Comments: CACIL4rl rA ,LJ-> &.A#, io(L OJI, -mr< C:W. Facility Name: NPDES No.: Type of Waste: Facility Status: Permit Status: Receiving Stream: Stream Classification: Subbasin: County: Regional Office: Requestor: Date of Request: Topo Quad: FACT SHEET FOR WASTELOAD ALLOCATION Mt. Airy NC0021121 56% domestic/44% industrial Existing Renewal Ararat River C 030703 Surry WSRO S. Wilson 11/4/93 B 16NE Request # 7650 Stream Characteristic: USGS # r A Date: %, Drainage Area (mi2): 75.2 �. Summer 7Q10 (cfs): 14.9 Winter 7Q10 (cfs): 31 Average Flow (cfs): 90 30Q2 (cfs): IWC (%): 42.09 Wasteload Allocation Summary (approach taken, correspondence with region, EPA, etc.) Mount Airy has recently come off an SOC for BODS and toxicity. The facility has had one violation of TSS since expiration of the SOC. The facility is still having sporadic results for toxicity testing. Mount Airy requests renewal of their current permit for 7 MGD wasteflow. Instream data indicates much fluctuation; some DO values are below 5 mg/1 up and downstream even in January. The area will be looked at more closely during basinwide renewal in 1999. Color monitoring/limit should be implemented at this facility after promulgation of color monitoring requirements. /�e�i e.,�c,-��Le�S�CBrrn#®yt, �t�c Lc �c�o r h5� �"� YP er BASIN HOLD until 6/30/94. u� c ehh`odo ca'H e Special Schedule Requirements and additional comments from Reviewers: ` r WA M MA ;. Recommended �. Reviewed by Instream Assessment: Date: I a `egional Supervisor:. - Date: Permits & Engineering: Date: RETURN TO TECHNICAL SERVICES BY: DEC 2 2 1993 2 CONVENTIONAL PARAMETERS Existing Limits: Monthly Average Summer Winter Wasteflow (MGD): 7.0 7.0 BODS (mg/1): 30 30 NH3N (mg/1): 13 monitor DO (mg/l): 5 monitor TSS (mg/1): 30 30 Fecal Col. (/100 ml): 200 200 PH (SU): 6-9 6-9 Residual Chlorine (µg/l): Oil & Grease (mg/1): 30 30 TP (mg/1): monitor monitor TN (mg/1): monitor monitor Recommended Limi Monthly Average Summer Winter WQ or EL Wasteflow (MGD): 7.0 7.0 BODS (mg/1): 30 30 NH3N (mg/1): 13 monitor DO (mg/1): 5 monitor TSS (mg/1): 30 30 Fecal Col. V100 ml): 200 200 PH (SU): 6-9 6-9 Residual Chlorine (µg/1): Oil & Grease (mg/1): 30 30 TP (mg/1): monitor monitor TN (mg/1): monitor monitor Limits Changes Due To: Parameter Affected Change in 7Q10 data Change in stream classification Relocation of discharge Change in wasteflow Other (onsite toxicity study, interaction, etc.) Instream data New regulations/standards/procedures New facility information (explanation of any modifications to past modeling analysis including new flows, rates, field data, interacting discharges) (See page 4 for miscellaneous and special conditions, if applicable) 3 TOXICS/METALS Type of Toxicity Test: Chronic Existing Limit: Chronic Qtrly P/F at 42% Recommended Limit: Chronic Qtrly P/F at 42% Monitoring Schedule: Jan Apr Jul Oct Existing Limits Max. COD (me:Daily Cadmium (ug/1): 4.7 Chromium (ug/1): 119 Copper (ug/1): monitor Nickel (ug/1): 209 Lead (ug/1): 59 Zinc (ug/1): monitor Cyanide (ug/1): 12 Phenols (ug/1): Mercury (ug/1): 0.028 Silver (ug/1): monitor Chlorides Recommended Limits Max. WQ or EL COD (mg/):Daily Cadmium (ug/1): 4.7 Chromium (ug/1): 119 Copper (ug/l): monitor Nickel (ug/1): 209 Lead (ug/1): 59 Zinc (ug/1): monitor Cyanide (ug/1): 12 Phenols (ug/1): Mercury (ug/1): 0.028 Silver (ug/1): monitor Chloride monitor quarterly Limits Changes_Due To: Parameter(s) Affected Other (onsite toxicity study, interaction, etc.) chloride monitoring recommended due to elevated levels in APAM _X_ Parameter(s) are water quality limited. For some parameters, the available load capacity of the immediate receiving water will be consumed. This may affect future water quality based effluent limitations for additional dischargers within this portion of the watershed. •0 No parameters are water quality limited, but this discharge may affect future allocations. 4 INSTREAM MONITORING REQUIREMENTS Upstream Location: at least 100 ft da4stream Downstream Location: 1) Downstream approximately 1.0 mile below the discharge before the conflurxct with Stewarts Creek 2) Appx. 6 miles below the discharge before the confluence with Caddle Cree Parameters: temperature, DO, Fecal coliform, conductivity Special instream monitoring locations or monitoring frequencies: MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS Adequacy of Existing Treatment Has the facility demonstrated the ability to meet the proposed new limits with existing treatment facilities? Yes _,,� No If no, which parameters cannot be met? Would a "phasing in" of the new limits be appropriate? Yes No If yes, please provide a schedule (and basis for that schedule) with the regional office recommendations: 4 If no, why not? Special Instructiong or Conditions Wasteload sent to EPA? (Major) _Y_ (Y or(N) (If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old assumptions that were made, and description of how it fits into basinwide plan) Additional Information attached? _N (Y oW If yes, explain with attachments. Facility Name AT. tf Permit # NL ZtlZI Pipe# CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY) The effluent discharge shall at no time exhibit chronic toxicity using test Procedures outlined in: 1.) The North Carolina Ceriodap hnia chronic effluent bioassa Procedure - Revised *September 1989) or subsequent versions.procedure (North Carolina Chronic Bioassay The eff,Z L concentration at which there maybe no observable inhibition of reproduction or significant (defined as treatment two in the North gnificant mortality Carolina Procedure document). The permit holder shall perform uanerl ? monitoring using this procedure to establish compliance with the performed after thi� rty days from the effective date of this permit condition. The first test will be e months o RN va ju' �' Effluent samplingforlthis tes ng hall nbe pefrformed at the NPD permitted final effluent discharge below all treatment processes ES All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Farm (MR-1) for the month in which it was performed, usin the g Additionally, DEM Form AT 1 (original) is to be sent to the following g parameter code TGP3B. g address: Attention: Environmental Sciences Branch North Carolina Division of Environmental Management 4401 Reedy Creek Road Raleigh, N.C. 27607 Test data shall be complete and accurate and include all Supporting_ association with the toxicity tests, as well as all dosej%sposedata. To�tal�dual chlorine of theeffluenttoxicity sample must be measured and re performed � ported if chlorine is employed for disinfection of the waste stream. Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoringwill begin immediately until such time that a single test is passed. Upon passing, this monthly test revert to quarterly in the months specified above. Y requirement will 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 ill survival and appropriate environmental controls, shall constitute an invalid test and wrequire immediate retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute noncompliance with monitoring requirements. 7Q10 1+9 cfs Permitted Flay _ 10 MOD AVC Z. % Basin & Sub -basin _h��N o(p3o7o3� Receiving Stream ZAaA-r 4 \fe7Z- County Recommended by: .P� Date POL ?IF'ersi®n "I rern rmv MORRISVa1_E-AVIATIONWWTP PERM:CHR LIM 90% 89 NR NR NR NR W NR NR NR NR NR tvi NiR NCO050041 Begin:611193 Frequency: Q P/F A JAN APR JUL OCT NonComp:SINGLE 90 NR PASS NR NR PASS - NR PASS - NFi NPI County: WAKE Region: RRO Subbasin: NEU02 91 bt .- PASS NPI - - PASS - - FAIL PASS - !, PP.:0.20 Special 92 PASS ••• •- PASS - - PASS - - FAIL PASS - 7Q10:0.0 fWC(%):100.0 Order. 93 PASS •V •FAIL •- - PASS - - PASS - MT. AIRY WWTP PERM CUR LIM:42% 89 - - FAIL FAIL r FAIL PASS PASS PASS bt -- NCO021121 Begin: I/1/92 Frequency: Q P/F A JUL OCT JAN APR NonComp:Single 90 PASS - - PASS(s) - - PASS -• •- PASS - .•. County: SURRY Region: WSRO Subbmin, YAD03 91 PASS --- PASSI FAIL,PI FAIL,Pf FAIL,PI FAIL,Pf FAIL.Pf FAIL,Pf Ff,NR FAIL.Ff FAIL,Pf PF: TO - Special 92 FAIL,Ff FAIL,Ff, FAIL,Pf FAIL,FI PASSf,FAIL PASSLPASS PASS,PASSI PASSI NR PASSLPASS PASSE PASSI 7Q10: 14.9 IWC(%):42.0 Order: 93 PASSI,FAIL PASSLPASS PASSI PASS - - FAIL PASS MT, GILEAD WWTP PERM CHR MONIT:69% (MONIT FIRST YR,THEN LIM) 69- NCO021105 Begm:3/l/93 Frequency: Q P!F SEP DEC MAR JUN NonComp: 90 - - - - - - - County:MONTGOMERY Region: FRO Subbasin: YAD08 91�- PF:0.8500 Special 92 - - ... __ .-- ,•• •,• - -,• .-. 7Q10:0.600 IWC(%):68.67 Order 93 - - PASS - - PASS - - PASS MT. HOLLY WWII' PERM CIIR LIM:6% 89 - - -• -• - ._. -.. .._ ._ __ ._ _. NCO021156 Begin:8/1/93 Frequency: Q P/F A FEB MAY AUG NOV NonComp:SINGLE 90 - PASS -- - PASS -- --- PASS - - PASS - County: GASTON Region: MRO Subbasin: CJB33 91 - PASS - - PASS - - PASS - - NR - PF 4.00 Special 92 -• NR - -- PASS - - PASS - --- - PASS 7Q10:95.00 IWC(%):6.10 Order 93 - PASS - -- PASS - - PASS MT. OLIVE PICKLE PERM CHR LIM:99% It 89 - NR - 21.9 NR - 37.0 NR - - 49 - NC0001074 Begin:1/1/88 Frequency: Q P/F FEB MAY AUG NOV NonComp: 90 58.7 - - 47.2 - - 84.3 •- - 25.6' NR - County: WAYNE Region: WARD Subbasin: CPF21 91 41.9' NR - 26,6' NR - 47.2' NR - 37,6' NR Ni PF:0.40 Special SOC: 7/90-7/l/93 Q 48HR AC MONrr 92 47.2' NR - 26.8' NPI _• - LATE 67.4' -- 24.7' - 7QI0:0.00 IWC(%):100.00 Order: 93 - 50.7' - - 76.5' - - 69.4' MT. OLIVE WWTP PERM CHR LIM:99% 89 -- - PASS - PASS - - PASS - - PASS NCO020575 Begin:2/1/88 Frequency; Q P/F A MAR JUN SEP DEC NonComp: 90 - - bt FAIL LATE FAIL - PASS PASS - - LATE County: WAYNE Region: WARO Subbasin: CPF21 91 PASS - PASS - - PASS - - PASS - - .. PASS PF:I.O Special 92 - PASS - - PASS - - PASS - PASS 7Q10:0.D00 IWC(%):100.00 Order: 93 -- - PASS - - PASS - - PASS MT. PISGAH LODGEIRECREATION AREA PERM: CHR LIM 25% 89 -- - - - - - - - - - - N00072729 Begin:7/1/93 Frequency: Q P/F A AUG NOV FEB MAY NonComp:SINGLE 90- County:HAYWOOD Region:ARO Subbasin:FRB05 91 - - - - - PASS - PASS - - - - PF:0.032 Special 92 - .-• - - -- PASS - PASS - - - - 7Q1C:0.15 IWC(%):25 Order: 93 - - - - - PASS - PASS MURFiIY WWTP PERM CHR LIM:1.5% 89 - - PASS - - PASS - - PASS - - PASS NCC320940 Begm:91V93 Frequency: Q P/F A MAR JUN SEP DEC NonComp:SINGI.E 90 - - PASS - - PASS - - PASS - - LATE County:CHEROKFE Region: ARO Subbasin: H1W02 91 PASS - LATE PASS - PASS - - PASS - - PASS PF:0.925 • Special 92 - - PASS - - PASS - - PASS - - PASS 7Q10:96.9 IWC(%):1.5 Order. ` 93 - - PASS - - PASS - - NASH CO SCHOOLS -CEDAR GROVE PERM CHR LIM:99% (GRAB) 89 -- NC0037923 Begin:l/l/91 Frequency: Q P/F A MAR JUN SEP DEC NonComp: 90 - County: NASH Region: RRO Subbasin: TAR02 91 -- PF:.0068 Special SOC: 9/14/89-12/31193 NO TOX REQ 92 - - - FAIL FAIL - - - - - - 7Q10:0.0 IWC(%):100.0 Omer. 93 - -•- - -_ - - __ -. NATIONAL ELECTRICAL CARBON CORP. PERM CHR LIM:99% (GRAB) (l l/l/93 NEW PERMIT) 89 NR - - NR FAIL - LATE - bl FAIL FAIL -- NC0060747 Begin:6/I3/90 Frequency: Q P/F A JAN APR JUL OCT NonComp: 90 Nl PASS - NR - -- PASS - - PASS - - County: HARNETT Region: FRO Subbasin: CPFI8 91 FAIL PASS - LATE PASS - FAIL PASS - PASS - - PP:0.026 Special 92 PASS - -- FAIL FAIL FAIL FAIL PASS(s) FAIL PASS - - 7QI0:0.00 IWC(%):100.00 Order. 93 PASS - - PASS - - FAIL - PENDING(s) r 0 2 consecutive failures = significant noncompliance V Pre 1989 Data Available LEGEND: PERM = Permit Requirement LET = Administrative Letter - Target Frequency = Monitoring frequency: Q- Quarterly; M- Monthly; BM- Bimonthly; SA- Semiannually; A- Annually; OWD- Only when discharging; D- Discontinued monitoring requirement; IS- Conducting independent study Benin = First month required 7Q10 = Receiving stream low Bow criterion (efs) A = quarterly monitoring increases to monthly upon single failure Months that testing must occur - ex. JAN,APR,TUL,OCT NonComp = Current Compliance Requirement PF = Permitted Bow (MGD) IWC%= Instream waste concentration P/F = Pass/Fazl chronic test AC = Acute CHR = Chronic Data Notation: f - Fathead Minnow; . - Ceriodaphnia so.: my - Mvsid shrimp: ChV - Chronic value; P - Mortality of stated oereentaec at hiehest concentration: at - Performed by DEM An Tox Group; bt - Bad test Reporting Notation: - = Data not required; NR -Not reported; ( ) - Beginning of Quarter Facility Activity Status: I - Inactive, N -Newly Issued(To construct); H -Active but not discharging; 1-More data available for month in question SIG -ORC signature needed 37 -79- .31 i- 30 NL Z ,0f - IP,L= 57 LJ-5,ASaV.7- 7o kt-Agy i-- i bf 7 IAI 11/19/93 ver 3.1 T O X I C S R E V I E W Facility: mt airy NPDES Permit No.: nc0021121 Status (E, P, or M) : E Permitted Flow: 7.0 mgd Actual Average Flow: 3.6 mgd Subbasin: 1030703 Receiving Stream: ararat river I--------- PRETREATMENT DATA -------------- I ---- EFLLUENT DATA---- l Stream Classification: C I ACTUAL PERMITTEDI I 7Q10: 14.9 cfs I Ind. + Ind. + I FREQUENCY I IWC: 42.14 t I Domestic PERMITTED Domestic I OBSERVED of Chronicl Stn'd / Bkg I Removal Domestic Act.Ind. Total Industrial Total I Eflluent Criteria I Pollutant AL Cone. I Eff. Load Load Load Load Load I Cone. Violationsl --------- -- (ug/1) (ug/1) ---------------- I I -------- (#/d) -------- (#/d) -------- (#/d) -------- (#/d) (#/d) I (ug/1) ($vio/#sam)l Cadmium S 2.0 I 67% 0.0180 0.0500 0.0680 --------- 0.1823 -------- 0.2003 I -------- I 825.0 --------- I l Chromium S 50.0 I 82% 0.0782 0.6550 0.7332 4.6900 4.7682 I 31.0 I I Copper AL 7.0 I 86% 0.2190 6.9400 7.1590 9.1100 9.3290 I 414.0 I N Nickel S 88.0 42% 0.0485 1.0100 1.0585 2.7200 2.7685 I 31.0 I P Lead S 25.0 I 61% 0.3911 1.1700 1.5611 0.7900 1.1811 I 44.0 I U Zinc AL 50.0 I 79% 1.1030 5.2200 6.3230 10.9500 12.0530 I 261.0 I T Cyanide S 5.0 1 69% 0.0485 0.4010 0.4495 0.7900 0.8385 l 16.0 I Mercury S 0.012 I 60% 0.0016 0.0059 0.0075 0.0000 0.0016 I 0.2 I S Silver AL 0.06 75% 0.0391 C.1120 0.1511 0.3700 0.4091 l 0.0 i E Selenium S 5.00 0% I I C Arsenic S 50.00 I 0% I I T Phenols S NA I 78% 0.1267 1.6500 1.7767 21.5700 21.6967 I 19.0 I I NH3-N C I 0% I 10 T.R.Chlor.AL 17.0 I I 0% l I I N I I I I--------------- ALLOWABLE PRDCT'D PRDCT'D PRDCT'D I I --------- MONITOR/LIMIT --------- I I 1--ADTN'L RECMMDTN'S-- 1 I Effluent Effluent Effluent Instream I Recomm'd I I Cone. using using Cone. Based on Based on Based on I FREQUENCY INSTREAM I i Allowable CHRONIC ACTUAL PERMIT using ACTUAL PERMITTED OBSERVED I Eff. Mon. Monitor. l Pollutant I Load Criteria Influent Influent OBSERVED Influent Influent Effluent I based on Recomm'd ? I --------- -- (#/d) (ug/1) (ug/1) (ug/1) (ug/1) Loading Loading Data I OBSERVED (YES/NO) I Cadmium S --------- l 0.67 ----------------- 4.747 0.756 -------- 2.227 -------- 347.62 -------- Limit -------- Limit ---------I Limit ----------------- I I NCAC YES I A Chromium S I 30.56 118.664 4.447 28.920 13.06 Monitor Limit Limit I NCAC NO N Copper AL I 5.50 16.613 33.772 44.009 174.44 Monitor Monitor Monitor I Weekly YES I A Nickel S 16.69 208.848 20.687 54.106 13.06 Monitor Limit Limit I NCAC NO I L Lead S I 7.05 591,332 20.515 15.521 18.54 Limit Limit Limit I NCAC YES I Y Zinc AL I 26.19 118.664 44.742 85.288 109.97 Monitor Monitor Monitor I Weekly YES I S Cyanide S i 1.77 11.866 4.695 8.759 6.74 Limit Limit Limit I NCAC YES I I Mercury S 0.00 0.028 0.101 0.022 0.08 Limit Limit Limit I NCAC YES I S Silver AL I 0.03 0.142 1.273 3.446 0.00 Monitor Monitor I Monthly NO 1 Selenium S I 0.55 11.866 0.000 0.000 0.00 I R Arsenic S I 5.50 118.664 0.000 0.000 0.00 I I E Phenols S l 0.000 13.171 160.839 8.01 Lgfit Lit , I NCAC YES 1 S NH3-N C I 0.000 0.00 / I I U T.R.Chlor.AL 40.346 0.00 I I L I I T I I I I S I NPDES PRETREATMENT INFORMATION REQUJEST FORM ' r FACILITY NAME: A41-. ki /Zy _ NPDES NO. NCO l V V l �jO ! / 2? / ° 3 REGION : V\[151 .D REQTJF.STER: 7 � t�i DATE: o ' r ' ' 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 ' r (attached) r This facility is currently implementing a pretreatment program. Please include the following conditions: Program Implementation r Additional Conditions r (attached) ' r � SIGNIFICANT INDUSTRIAL USERS` (SIUs) CONTRIBUTIONS SIU FLOW - TOTAL: 3,VZZ � r r r r Af - COMPOSITION: TEXTrT.F: MGD METAL FINISHING: MGD OTHER: KD r r ' —� r r ' r MGD ' r i MGD r r r r . OW i PASS PARAME`I'E�t !THROUGH DAILY LOAD ACTUAL 'ALL( ±.JI.E.'1L:+_S' IC 7]7I(N}�LBS/aAY ,T �Y 111i S'TD T' AT. v2 .K 1'l'C �.f/l\YET 621 Cr 2S /9 —� Q7-2L Cu ,vo c r q 219 �2.� � Ni e3.73— Z Pb 5, 7L 3W Zn CN /, 7S' � Z Z O / -7-9 Phenol other / (,�_, 3, _ — , �� . i -- _ —65 t '497_ lv�,g rOZZ . 37 �/a�/E , r a _,�0c�_S�1 60 r RECEIVED: r /D/27/ REVIEWED BY: RETURNED: /� The SAS System 2 15:34 Tuesday, November 2, 1993 ------------------------------ NPDES=NCO021121 ---------------------------- Variable Sum PIPE 13.0000000 _TYPE_ 0 _FRE(- 296.0000000 MCDL 180.0076676 MCRL 0.6550700 MCUL 6.9432835 MNIL 1.0191863 MPBL 1.1737660 MZNL 5.2239526 MCNL 0.4016866 MHGL 0.0059193 MAGL 0.1127781 MASL 83.8870560 MPHENOLL 1.6573693 MFLL MBODL 4540.83 MCODL 19165.88 MTSSL 3128.27 MTOLUL MFEL MALL MCHLORID FLOW 3.4223867 The SAS System 1 15:34 Tuesday, November 2, 1993 OBS NPDES IUNUM PIPE _TYPE_ _FRE(_ MCDL MCRL MCUL MNIL 1 NCO021121 0001 1 0 26 179.951 0.05472 0.05736 0.04776 2 N00021121 0003 1 0 10 0.001 0.00842 0.00881 0.00709 3 NCO021121 0004 1 0 10 0.001 0.00453 0.08665 0.00658 4 N00021121 0006 1 0 26 0.004 0.07089 0.46686 0.03749 5 NCO021121 0007 1 0 25 0.000 0.00458 0.01436 0.00505 6 NCO021121 0008 1 0 26 0.003 0.03127 0.17281 0.01835 7 NCO021121 0009 1 0 26 0.003 0.04966 0.34864 0.04206 8 N00021121 0010 1 0 33 0.022 0.25324 4.71402 0.56832 9 NCO021121 0011 1 0 26 0.002 0.03600 0.17682 0.02446 10 NCO021121 0012 1 0 26 0.004 0.05257 0.56868 0.05240 11 NCO021121 0013 1 0 26 0.002 0.01873 0.09105 0.02507 12 NCO021121 0014 1 0 26 0.003 0.06915 0.17357 0.02927 13 NCO021121 0015 1 0 10 0.013 0.00132 0.06366 0.15529 OBS MPBL MZNL MCNL MHGL MAGL MASL MPHENOLL MFLL 1 0.12030 1.06459 0.01020 .0003821 0.012030 83.8871 0.04364 2 0.01480 0.10690 0.00142 .0000567 0.001480 0.00183 3 0.01509 0.07277 0.00189 .0000527 0.001509 0.00686 4 0.07986 1.05518 0.00959 .0002999 0.007986 0.05849 5 0.01154 0.08897 0.00114 .0000416 0.001154 0.00426 6 0.03192 0.14630 0.00470 .0002251 0.003192 0.02319 7 0.06874 0.23842 0.01181 .0003132 0.006874 0.08438 8 0.58074 0.74476 0.09792 .0023033 0.054858 0.61018 10 0.07270 1.00852 0.18723 02855 .0003476 0.006849 0.0.31341 0. 11 0.05856 0.13622 0.00564 .0002005 0.005908 0466 0. 12 0.05885 0.35724 0.00742 .0002384 0.005885 43533 0.00062 13 0.00381 0.08896 0.03106 .0012713 0.000381 • 0062 OBS MBODL MCODL MTSSL MTOLUL MFEL MALL MCHLORID FLOW 1 179.73 2731.66 82.68 0.22905 2 60.22 223.39 17.77 0.03401 3 20.28 214.83 18.78 0.03157 4 340.17 1339.53 158.01 0.17979 5 30.77 120.48 36.97 0.02422 6 258.00 559.29 57.92 0.07629 7 274.98 858.29 110.48 0.18471 8 1462.48 7687.54 1134.28 1.34054 9 150.78 849.91 68.37 0.11003 10 547.75 2423.93 613.25 0.20841 11 220.23 728.13 58.01 0.11858 12 314.99 1202.15 219.26 0.14038 13 680.44 226.74 552.47 0.74480 The SAS System 1 10:18 Wednesday, November 17, 1993 OBS NPDES IUNUM PIPE _TYPE_ _FREGL MCDL MCRL MCUL MNIL 1 NCO021121 0001 1 0 26 179.951 0.05472 0.05736 0.04776 2 NCO021121 0003 1 0 10 0.001 0.00842 0.00881 0.00709 3 NCO021121 0004 1 0 10 0.001 0.00453 0.08665 0.00658 4 NCO021121 0006 1 0 26 0.004 0.07089 0.46686 0.03749 5 NCO021121 0007 1 0 25 0.000 0.00458 0.01436 0.00505 6 NCO021121 0008 1 0 26 0.003 0.03127 0.17281 0.01835 7 NCO021121 0009 1 0 26 0.003 0.04966 0.34864 0.04206 8 NCO021121 0010 1 0 33 0.022 0.25324 4.71402 0.56832 9 NCO021121 0011 1 0 26 0.002 0.03600 0.17682 0.02446 10 NCO021121 0012 1 0 26 0.004 0.05257 0.56868 0.05240 11 NCO021121 0013 1 0 26 0.002 0.01873 0.09105 0.02507 12 NCO021121 0014 1 0 26 0.003 0.06915 0.17357 0.02927 13 NCO021121 0015 1 0 10 0.013 0.00132 0.06366 0.15529 OBS MPBL MZNL MCNL MHGL MAGL MASL MPHENOLL MFLL 1 0.12030 1.06459 0.01020 .0003821 0.012030 83.8871 0.04364 2 0.01480 0.10690 0.00142 .0000567 0.001480 0.00183 3 0.01509 0.07277 0.00189 .0000527 0.001509 0.00686 4 0.07986 1.05518 0.00959 .0002999 0.007986 0.05849 5 0.01154 0.08897 0.00114 .0000416 0.001154 0.00426 6 0.03192 0.14630 0.00470 .0002251 0.003192 0.02319 7 0.06874 0.23842 0.01181 .0003132 0.006874 0.08438 8 0.58074 0.74476 0.09792 .0023033 0.054858 0.61018 9 0.05686 0.11510 0.03168 .0001869 0.004671 0.02855 10 0.07270 1.00852 0.18723 .0003476 0.006849 0.31341 11 0.05856 0.13622 0.00564 .0002005 0.005908 0.04662 12 0.05885 0.35724 0.00742 .0002384 0.005885 0.43533 13 0.00381 0.08896 0.03106 .0012713 0.000381 0.00062 OBS MBODL MCODL MTSSL MTOLUL MFEL MALL MCHLORID FLOW 1 179.73 2731.66 82.68 0.22905 2 60.22 223.39 17.77 0.03401 3 20.28 214.83 18.78 0.03157 4 340.17 1339.53 158.01 0.17979 5 30.77 120.48 36.97 0.02422 6 258.00 559.29 57.92 0.07629 7 274.98 858.29 110.48 0.18471 8 1462.48 7687.54 1134.28 1.34054 9 150.78 849.91 68.37 0.11003 10 547.75 2423.93 613.25 0.20841 11 220.23 728.13 58.01 0.11858 12 314.99 1202.15 219.26 0.14038 13 680.44 226.74 552.47 0.74480 The SAS System 2 10:18 Wednesday, November 17, 1993 ------------------------------ NPDES=NC0021121 ---------------------------- Variable Sum PIPE 13.0000000 _TYPE_ 0 _FREGL 296.0000000 MCDL 180.0076676 MCRL 0.6550700 MCUL 6.9432835 MNIL 1.0191863 MPBL 1.1737660 MZNL 5.2239526 MCNL 0.4016866 MHGL 0.0059193 MAGL 0.1127781 MASL 83.8870560 MPHENOLL 1.6573693 MFLL MBODL 4540.83 MCODL 19165.88 MTSSL 3128.27 MTOLUL MFEL MALL MCHLORID FLOW ---------------------- 3.4223867 4 SOC PRIORIT�Y PROJECT: Yes No'>� If Yes, SOC No. cc: Permits and Engineering Technical Support Branch ' { County Health Dept. 1993 Central Files _ a. WSRO To: Permits and Engineering Unit , Water Quality Section Attention: Susan A. Wilson - Date —December 10, 1993 NPDES STAFF REPORT AND RECOMMENDATION County SURRY Permit No. NC0021121 PART I - GENERAL INFORMATION 1. Facility and Address: City of Mount Airy WWTP P.O. Box 70 Mount Airy, NC 27030 2. Date of Investigation: December 8, 1993 3. Report Prepared by: George Smith 4. Persons Contacted and Telephone Number: Mr. Chris Marion (910) 786-3542 5. Directions to Site: From Winston-Salem, follow Hwy 52 north to Mt. Airy at intersection of Newsome St. (SR2116) and make U-turn. Travel Hwy 52 south and turn right on first paved road. 6. Discharge Point(s), List for all discharge points: Latitude: 36° 28' 41" Longitude: 800 36' 10" Attach a USGS map extract and indicate treatment facility site and discharge point on map. U.S.G.S. - Quad No. B16NE Quad Name Mt. Airy South 7. Site size and expansion area consistent with application ? X Yes No If No, explain: 8. Topography (relationship to flood plain included): This facility is located on level ground above the flood plain. 9. Location of nearest dwelling: None within 1000 feet. 10. Receiving stream or affected surface waters: Ararat River a. Classification: Class C b. River Basin and Subbasin No.: Yadkin, 03-07-03 C. Describe receiving stream features and pertinent downstream uses: Fishing, wildlife, recreation, and agriculture. PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS 1. a. Volume of Wastewater to be permitted: 7.0 MGD (Ultimate Design Capacity) b. What is the current permitted capacity of the Waste Water Treatment facility? 7.0 MGD C. Actual treatment capacity of the current facility (current design capacity)? 7.0 MGD d. Date(s) and construction activities allowed by previous Authorizations to Construct issued in the previous two years: N/A e. Please provide a description of existing or substantially constructed wastewater treatment facilities: Existing 7.0 MGD plant with mechanical bar screening, grit collection, wet well with pump and alarm, primary clarifiers, trickling filters, activated sludge tank, secondary clarifiers, belt press, sludge thickener, chlorine contact tank, dechlorination, anaerobic digester, continuous recording flow meter, land application. f. Please provide a description of proposed wastewater treatment facilities: N/A g. Possible toxic impacts to surface waters: None h. Pretreatment Program (POTWs only): in development approved X should be required not needed 2. Residuals handling and utilization/disposal scheme: a. If residuals are being land applied, please DEM permit # WQ0000956 Residuals Contractor City of Mount Airy Telephone No. (910) 786-3556 b. Residuals stabilization: PSRP X PFRP Other C. Landfill: N/A d. Other disposal/utilization scheme (Specify): NONE 3. Treatment plant classification (attach completed rating sheet): Class IV 4. SIC Code(s): 4952 Wastewater Code(s) of actual wastewater, not particular facilities i.e.., non -contact cooling water discharge from a metal plating company would be 14, not 56. Primary 55 Secondary 01 Main Treatment Unit Code: 0 1 0 3 PART III - OTHER PERTINENT INFORMATION 1. Is this facility being constructed with Construction Grant Funds or are any public monies involved. (municipals only)? NO 2. Special monitoring or limitations (including toxicity) requests: NONE 3. Important SOC, JOC or Compliance Schedule dates: N/A (Please indicate) Date Submission of Plans and Specifications Begin Construction Complete Construction NPDES Permit Staff Report Version 10/92 Page 3 4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge options available. Please provide regional perspective for each option evaluated. Spray Irrigation: N/A Connection to Regional Sewer System: N/A Subsurface: N/A Other disposal options: N/A 5. Other Special Items: N/A PART IV - EVALUATION AND RECOMMENDATIONS This facility has been recently upgraded from a 4.0 to 7.0 MGD municipal facility. Solids build-up in the aeration basin was noticed, because of the presence of a large dark brown foam. The solids could not be wasted because the belt press was broken for 5 days. The POTW personnel said it was difficult to control the solids at this facility. This office highly recommends this facility be assigned an ADMI color limit for the effluent. Recommend the permit be renewed. Signature of report preparer Water Quality Regid6al Supervisor NPDES Permit Staff Report Version 10/92 12-16)-ci.g Date /Z /4--1q3 Date Page 4 UNITED STATES :s DEPARTMENT OF THE INTERIOR J� CEOLOGICAL SURVEY O 37'30" HJj.LsvrLL£. VA. 21 MI. s uoom.E CLAUDVILLE. A. r2 Ml. 6° 30' V s37 35' 538 80°_ CA NA. 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