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Home My WebLink AboutNC0085359_Permit (Modification)_20061228NPDES DOCUHENT !CANNING COVER SHEET NPDES Permit: NC0085839 Twelve Mile Creek WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: December 28, 2006 This document is printed on reuse paper - ignore any content on the reirerse aide o WAIF Michael F. Easley, Governor �QQ State of North Carolina 3' William G. Ross, Jr., Secretary r- Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality December 28, 2006 Ms. Christie Putnam, P.E. Union County Public Works 400 North Church St. Monroe, North Carolina 28112 Subject: NPDES Permit Modification Union County - Twelve Mile Creek NPDES Permit No. NC0085359 Union County Dear Ms. Putnam: Division personnel have reviewed and approved your request for modification of the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated May 9, 1994 (or as subsequently amended). This revised permit includes the following change from your current permit: Monthly monitoring requirement for total chromium has been deleted from this permit because the parameter was not detected for twelve consecutive months of monitoring as reported in the DMRs. You should continue monitoring through the LTMP in the pretreatment program. If any parts, measurement frequencies, or sampling requirements contained in this permit modification are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the office of Administrative Hearings, Mail Service Center 6714, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall be final and binding. Please take notice that this permit is not transferable except after notice to the Division of Water Quality. The Division of Water Quality may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits, which may be required by the Division of Water Quality, the Division of Land Resources, the Coastal Area Management Act, or any other federal or local governmental permit. If you have any questions regarding the NPDES permit modification, please contact Agyeman Adu-Poku at (919) 733 - 5083, extension 508. Sincerely, Alan W. Klimek, P.E. cc: Mooresville Regional Office/Surface Water Section Central Files NPDES Unit EPA Region IV, Roosevelt Childress North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, North Carolina 27699-1617 (919) 733-7015 FAX (919) 733-0719 On the Internet at http://h2o.enr.state.nc.us/ Permit NC0085359 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [2.5 MGD] During the period beginning on the effective date of the permit and lasting until expansion above 2.5 MGD or expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: ., . r, - •.r.. �¢t �Y 4 hbi�c..�� `-��rd'Yhr � s F�` ''.'�• i�.•�.�'.�`@:i-' •P ,,_ . - ' +�_.-". �,..^:-t. L�iS � ,, 4,., ':: ,w r = x ; ; �Y +F �"r CRC' F fTr�- y 't ''' : ' . ' � . w .Monthly : .k r'7� '' era e: ; r'S'Y'�+Y; yWee y.� •�, ti.'�;�.l.T�".. A vera a -^Y ...Dar " 2Dj � ��, � �r arc u ,R= -�G�•3iT. �ii ea a pm s . - �*+.�s .�' .r ate a its °T I . e• r �r�� r:. ' ' " . .. ' �dtP.! T.` : ; ,Sa e cm ions � T i. p �_ ..�a r :• x �' .. T w ; ��sY a `' '� Flow 2.5 MGD ' Continuous Recording Influent or Effluent BOD, 5-day, 20°C (April 1- 0ctober 31) 2 5.0 mg/L 7.5 mg/L Daily Composite Influent & Effluent BOD, 5-day, 20°C (November 1- March 31) 2 10.0 mg/L 15.0 mg/L Daily Composite Influent & Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L Daily Composite Influent & Effluent NH3 as N (April 1— 0ctober 31) 2.0 mg/L 6.0 mg/L Daily Composite . Effluent NH3 as N (November 1— March 31) 4.0'mgIL 12.0 mg/L _. Daily Composite Effluent • Dissolved 0xygen3 • Daily Grab Effluent Dissolved Oxygen (June through September) - 3/Week Grab • • - ... Upstream & Downstream1 Dissolved Oxygen (October through May) - 1/Week Grab • Upstream & Downstream1 pH > 6.0 and < 9.0 standard units Daily Grab Effluent Total Residual Chlorine4 17.0 pg/L 28.0 pg/L Daily Grab Effluent Total Nitrogen (NO2+NO3+TKN) Monthly Composite Effluent Total Phosphorus 5 Monthly Average: 41.70 pounds/day 12 Month average: 20.85 pounds/day Monthly Composite . . Effluent Temperature, °C Daily Grab- • - Effluent Temperature, °C (June through September) 3IWeek Grab Upstream & Downstream1 Temperature, °C (October through May) 1/Week Grab-: . . Upstream & Downstream1 Fecal Coliform (geometric mean) 200/100 ml 400/100 mi Daily Grab Effluent Fecal Coliform (geometric mean) (June through September) 3IWeek Grab - Upstream & Downstream1 Fecal Coliform (geometric mean) (0ctober through.May) 1lWeek Grab. Upstream & Downstream1 Conductivity Daily Grab Effluent Conductivity (June through September) 3/Week Grab Upstream & Downstream1 Conductivity (October through May) 1lWeek Grab . Upstream & Downstream1 Total Copper 13.2 Ng/I 18.5 pg/l Weekly Composite Effluent Total Zinc 175 pg/l Weekly Composite Effluent Chronic Toxicity6 Quarterly Composite. Effluent Annual Pollutant Scan? . Annually See A.(6.) Effluent Notes on following page: Permit NC008535q A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [2.5 MGM [continued] 1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two locations. D 1: One quarter mile downstream from the outfall, before confluence with the first tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is recommended to provide DO stream profile of Twelve Mile Creek in North Carolina and South Carolina. 2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L. 4. Monitoring requirement and limit applies only if chlorine is added for disinfection. 5. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month limits. 6. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and November (see A. (4.)). 7. See Special Condition A. (6.) There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit NC0085359 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [3.0 MGD] During the period after receipt of an Authorization to Operate (and any subsequent certification if required) and lasting until expansion above 3.0 MGD, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: ifs`+:'?�?tif F. EFFLuENTr , ;. - ,.e .� c .t}'., 'CICARACTERi3T!CS y �.0 ; ,. :�'; �Yy�.a'r.# y s�� "'. "".c yF .a0. ,'•, �. I f' 3 11�1TS � �� " 1 �`s , ,� ' G ..,- k' ....;.a �; � •fir .irc sx y O � , ' � ' - _� t:f .irk'. ; ,. : 1 . of- Q IC lti r,' '; ,� �3 ,. 1.. — - �,. � :: r �' .'{ `_' .� , � �� ' ... { •' ' i ` ; � 'L�7 i" .t >,.,i-- h . , r Af 4 _ -,. .... -� ; ,Monthl , : `.'` 'r t '1 ..jAvera a -r w g. .A ,;Wee .` '' .s' T', u; a - �. . Avera a �i Dailf .� ..�. e. , Ma lthum:-, , ensure en v� r _ .� . ' l_..� tlen �. � � .• . e,fii`, � xL. : -.. F r ..rc% 7 m "` = ocatio{/4��: .0 , r `� d 'G;•` .�. i - t.1. . - � i� . Flow 3.0 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C (April 1- October 31) 2 5.0 mg/L 7.5 mg/L Daily Composite . Influent & Effluent BOD, 5-day, 20°C (November 1- March 31) 2 10.0 mg/L 15.0 mg/L Daily Composite Influent & Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L Daily Composite - _ Influent & Effluent NH3 as N (April 1— October 31) 1.0 mg/L 3.0 mg/L Daily Composite . Effluent NH3 as N (November 1— March 31) 2.0 mg/L 6.0 mg/L Daily Composite Effluent Dissolved 0xygen3 Daily Grab Effluent Dissolved Oxygen (June through September) 3/Week Grab Upstream & Downstream1 Dissolved Oxygen (October through May) 1/Week Grab • Upstream & Downstream1 pH > 6.0 and < 9.0 standard units Daily Grab Effluent Total Residual Chlorine4 17.0 pg/L Daily Grab Effluent Total Nitrogen (NO2+NO3+TKN) Monthly Composite Effluent Total Phosphorus 5 - Monthly Average: 41.70 pounds/day 12 Month average: 20.85pounds/day Monthly Composite Effluent Temperature, °C Daily Grab Effluent Temperature, °C (June through September) 3/Week Grab . Upstream & Downstream.' :' Temperature, °C (October through May) 1/Week Grab Upstream & Downstream1 Fecal Coliform (geometric mean) 200/100 ml - 400/100 ml Daily Grab Effluent Fecal Coliform (geometric mean) (June through September) 3/Week . Grab Upstream & Downstream1 Fecal Coliform (geometric mean) (October through May) 1/Week Grab Upstream & Downstream1 Conductivity Daily Grab Effluent Conductivity (June through September) 3/Week Grab Upstream & Downstream1 Conductivity (October through May) 1/Week Grab Upstream & Downstream1 Total Copper 13.0 pg/I 18.5 pgil Weekly . Composite Effluent Total Zinc 172 pg/I Weekly Composite Effluent Chronic Toxicity6 Quarterly Composite Effluent Annual Pollutant Scan7 Annually See A.(6.) Effluent Notes on following page: Permit NC0085359 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [3.0 MGD] -[continued] 1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two locations. D 1: One quarter mile downstream from the outfall, before confluence with the first tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is recommended to provide DO stream profile of Twelve Mile Creek in North Carolina and South Carolina. 2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 3. • The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L. 4. Monitoring requirement and limit applies only if chlorine is added for disinfection. 5. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month limits. 6. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and November (see A. (4.)). 7. See Special Condition A.(6). There shall be no discharge of floating solids or visible foam in other than trace amounts. Permit NC0085359 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.0 MGD] During the period beginning upon expansion above 3.0 MGD and lasting until expiration, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: rt-n "�a.. `¢ :: ..i. Y! �LUCx,.�s -'�yt ,/fir' Q i� `/.�=C •'■ . Y'��\ ��V_�'VV�.,� �. ffaa{ }}��,,++ "R y �. t -, ::C , 4... ,4 TS + } Ij r} �•d`�Lt irN � �i �tr�•,"tr. ,� ! °� :.,'.$raq ) ��3,-1'' `r. �.:i' ♦� i 1 4 f t.f y. _ _ , . 7 ..i e(3017, Q TO GR il x_ y i!'." � rykt^rpt. r. W �V• W..Y1I ` . _ _......_ .. ' A UI S ' •� �� "i�d;. err F•e7F� ��t'l., ,ee ,p $ w 1�?Y + }ti.'}i4fi'i1 T'� if'S, t' •} .� y - ,, 4xf', ' 74 , y, r"hY1... �IS y.{�� '1r ,��°jj�� , k �.„ .: �. � ,} {,3 .=.1.�vl � r na c ..�...`�x�..��+�"y�i4` ,'r 'S!Mtr d. %y oyS th , r ve a i��.. �...�9.. r�i : C. N e'.e ti .�6'a+i vera �i � a�.. - # ,�- ,t .-• ',J`!i �3 ail k■.y ,R ^,# r'■Mryaximumm• �S;S�•.._ ,. '3—• J i `r8r'°�7zc+hvs+.rza&,:- t , {jea ur a ,� rrQ� t y YY, K.M�,�. :t !: 'ilk i�:w tT 9 Y.`. S p! Ty et r i'4' i..• ... ;�.�. Nr,y, . .`. ..HY r.r awt- � . oa tr •' y S• ; � .. ,. ..� ..3': Flow 6.0 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C (April 1- October 31) 2 5.0 mglL 7.5 mglL Daily Composite Influent & Effluent BOD, 5-day, 20°C (November 1- March 31) 2 10.0 mglL 15.0 mg/L Daily Composite Influent & Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L Daily Composite influent & Effluent NH3 as N (April 1— October 31) 1.0 mglL 3.0 mg/L Daily Composite Effluent NH3 as N (November 1— March 31) 2.0 mg/L 6.0 mg/L Daily Composite Effluent Dissolved 0xygen3 Daily Grab Effluent Dissolved Oxygen (June through September) 3/Week Grab Upstream & Downstreaml Dissolved Oxygen (0ctober through May) 1/Week Grab Upstream & Downstreaml pH ? 6.0 and < 9.0 standard units Daily Grab Effluent Total Residual Chlorine4 17.0 pg/L Daily Grab Effluent Total Nitrogen (NO2+NO3+TKN) Monthly Composite Effluent Total Phosphorus 5 Monthly Average: 41.70 pounds/day 12 Month average: 20.85 pounds/day Monthly Composite Effluent Temperature, °C Daily Grab Effluent Temperature, °C (June through September) 3/Week Grab Upstream & Downstreaml Temperature, °C (0ctober through May) 1/Week Grab Upstream & Downstreaml . Fecal Coliform (geometric mean) 200/100 ml 400/100 ml Daily Grab Effluent Fecal Coliform (geometric mean) (June through September) 3/Week Grab Upstream & Downstreaml Fecal Coliform (geometric mean) (October through May) 1/Week Grab Upstream & Downstreaml Conductivity Daily Grab Effluent Conductivity (June through September) 3/Week Grab Upstream & Downstreaml Conductivity (October through May) 1/Week Grab Upstream & Downstreaml Total Copper 13.0 pg/I 18.5 pg/I Weekly Composite Effluent Total Zinc 172 pg/I Weekly Composite Effluent Chronic Toxicity6 Quarterly Composite Effluent Annual Pollutant Scan7 Annually See A.(6.) Effluent Notes on following page: Permit NC0085359 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.0 MGD] -[continued] 1. Upstream: 50 feet upstream from the outfall. Downstream samples shall be collected at two locations. D 1: One quarter mile downstream from the outfall, before confluence with the first tributary. D2: at NCSR 1301. Additional downstream dissolved oxygen monitoring is recommended to provide DO stream profile of Twelve Mile Creek in North Carolina and South Carolina. 2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the respective influent value (85% removal). 3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L. 4. Monitoring requirement and limit applies only if chlorine is added for disinfection. 5. Part A. (5.) describes the methodology for calculation of the monthly average and 12-month limits. 6. Chronic Toxicity (Ceriodaphnia) P/F @ 90% with testing in February, May, August and November (see A. (4.)). 7. See Special Condition A.(6). There shall be no discharge of floating solids or visible foam in other than trace amounts. DENR / DWQ / NPDES Unit FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES Permit NC0085359 INTRODUCTION The Union County Public Works Twelve Mile Creek Wastewater Treatment Plant (WWTP), herein called Twelve Mile Creek or the permittee, requires a National Pollutant Discharge Elimination System (NPDES) permit to discharge treated wastewater to the waters of the state. The permittee's 5-year NPDES permit expired at midnight on June 30, 2010 and have requested permit limits modification from the Division of Water Quality. This Fact Sheet summarizes background information and rationale used by the Division's NPDES Unit to determine permit limits and monitoring frequencies revision. Table 1. Twelve Mile Creek WWTP Facility Information Applicant/Facility Name Twelve Mile Creek WWTP Applicant Address 400 North Church Street Monroe, NC 28112 Facility Address 3104 Providence Road South Waxhaw NC 28173 Permitted Flow (MGD) 2.5/3.0/6.0 MGD Type of Waste Domestic Facility Class Class IV _ County Union Facility Status Modification Regional Office Mooresville Stream Characteristics Receiving Stream Twelve Mile Creek Stream Classification C Drainage Area (sq. mi.) 76.8 Drainage basin Catawba River Summer 7Q10 (cfs) 0.1 Subbasin 03-08-38 Winter 7Q10 (cfs) 1.5 Use Support Yes 30Q2 (cfs) 303(d) Listed No Average Flow (cfs) 72.7 State Grid . Catawba IWC (%) 97/98/99 USGS Topo Quad H 15 NE SUMMARY OF FACILITY STATUS Union County has requested modification of the Twelve Mile Creek WWTP total chromium monitoring requirement in the current permit. This request was made because the current has a language that permittee could request deletion of total chromium monitoring if twelve consecutive months of total chromium data is provided to show non detection in the effluent. Fact Sheet Renewal -- NPDES Permit NC0085359 Page 1 PROPOSED CHANGES • Monitoring Frequencies: • Monthly monitoring for total chromium has been deleted because twelve months of effluent data showed no detection. Monitoring of total will continue through the Pretreatment Long Term Monitoring Program. PROPOSED SCHEDULE OF ISSUANCE Permit Scheduled to Issue: December 28, 2006 NPDES UNIT CONTACT If you have questions regarding any of the above information or on the attached permit, please contact Agyeman Adu-Poku at (919) 733-5083 ext. 508. NAME: DATE: Fact Sheet Renewal -- NPDES NC0085359 Page 2 UNION COUNTY PUBLIC WORKS Christie L. Putnam, P.E., Director November 29, 2006 DEC Jacquelyn Nowell, Environmental Specialist NCDENR — DWQ NPDES Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 SUBJECT: Discontinuance of Monitoring Request - Effluent Chromium Twelve Mile Creek WWTP - NC0085359 Union County Dear Ms. Nowell: 1 2006 Union County Public Works (UCPW) was issued NPDES Permit NC0085359 with an effective date of August 1, 2006. Section A (1) of the Permit requires monthly monitoring of Total Chromium. Footnote No. 6 allows the parameter to be deleted upon written notification from your unit. Please accept this letter as a formal request to delete the monitoring requirement for Total Chromium from our permit. UCPW feels that weekly sample results dating back to November 2005 support this request. UCPW had our contracted laboratory, Pace Analytical, analyze our effluent for chromium in excess of 50 times since November 2005. All results have been below the analytical method detection level. Please find a recap of the monitoring results in the table below: Twelve Mile Creek WWTP Effluent Total Chromium Concentrations (ug/I) DATE CONCENTRATION (ug/I) 11-1-05 <2 11-8-05 <2 11-15-05 <2 11-22-05 <2 11-29-05 <2 12-6-05 <2 12-14-05 <2 12-20-05 <2 12-29-05 <2 1-5-06 <2 1-12-06 <2 1-20-06 <2 400 North Church St. • Monroe, North Carolina 28112-4804 • Phone: (704)296-4210 • Fax: (704)296-4232 Twelve Mile Creek WWTP Effluent Total Chromium Concentrations (ug/l) (continued) DATE CONCENTRATION (ugll) 1-23-06 <2 2-3-06 <2 2-10-06 <2 2-17-06 <2 2-24-06 <2 3-3-06 <2 3-9-06 <2 3-17-06 <2 3-24-06 <2 3-30-06 <2 4-7-06 <2 4-13-06 <2 4-21-06 <2 4-28-06 <2 5-5-06 <2 5-12-06 <2 5-19-06 <2 5-26-06 <2 6-2-06 <2 6-9-06 <2 6-16-06 <2 6-23-06 <2 6-30-06 <2 7-7-06 <2 7-14-06 <2 7-21-06 <2 7-28-06 <2 8-4-06 <2 8-11-06 <2 8-18-06 <2 8-25-06 <5 9-1-06 <5 9-8-06 <5 9-15-06 <5 9-22-06 <5 9-29-06 <5 10-6-06 <5 10-13-06 <5 10-21-06 <5 10-27-06 <5 As can be seen from the monitoring results, chromium should not be a pollutant of concern for the Twelve Mile facility. There are no known significant industrial users discharging to the Twelve Mile Creek WWTP and therefore no suspect contributors of chromium. The facility consistently passes Chronic Toxicity testing. UCPW appreciates your consideration of the request to remove the monitoring requirement for chromium from our NPDES permit. If additional information is required please do not hesitate to contact Mark Tye at (704) 296-4215 or e-mail Y!(dpco.union.nc.us Respectfully, hristie L. Putnam, PE Director of Public Works CC: Mark Tye, UCPW John Hahn, UCPW Jim Struve, Hazen & Sawyer IWC Calculations Twelve Mile Creek WWTP NC0085359 Prepared By: Agyeman Adu-Poku, NPDES Unit Enter Design Flow (MGD): Enter s7Q10(cfs): Enter w7Q10 (cfs): 3 0.1 1.5 Residual Chlorine 7Q10 (CFS) DESIGN FLOW (MGD) DESIGN FLOW (CFS) STREAM STD (UG/L) UPS BACKGROUND LEVEL (l IWC (%) Allowable Conc. (ug/l) Fecal Limit (If DF >331; Monitor) (If DF <331; Limit) Dilution Factor (DF) Ammonia (NH3 as N) (summer) 0.1 7Q10 (CFS) 3 DESIGN FLOW (MGD) 4.65 DESIGN FLOW (CFS) 17.0 STREAM STD (MG/L) 0 UPS BACKGROUND LEVEL 97.89 IWC (%) 17 Allowable Conc. (mg/1) 200/100mI 1.02 Ammonia (NH3 as N) (winter) 7Q10 (CFS) DESIGN FLOW (MGD) DESIGN FLOW (CFS) STREAM STD (MG/L) UPS BACKGROUND LEVEL IWC (%) Allowable Conc. (mg/I) Rule of tumb never give small facility <2 ug/L of NH3 NPDES Servor/Current Versions/IWC 0.1 3 4.65 1.0 0.22 97.89 1.0 1.5 3 4.65 1.8 0.22 75.61 2.3 12/28/2006