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HomeMy WebLinkAboutNC0007510_Draft Permit_20171213Water Resources ENVIRONMENTAL QUALITY ROY COOPER Govei not MICHAEL S REGAN Sea elaq LINDA CULPEPPER Into un Du eclot December 13, 2017 Mr. Rhett B. White, Town Manager Town of Columbia PO Box 361 Columbia, NC 27925-0361 Subject: Draft NPDES Permit NC0007510 Columbia WTP Class PC -1 Tyrrell County Dear Mr. White: The Division has reviewed your request to renew the subject permit. Please review this draft carefully to ensure your thorough understanding of the information, conditions, and requirements it contains. The draft permit includes the following significant changes from the existing permit: ➢ Section A. (3) has been added to require electronic submission of effluent data, and a footnote has been added in Section A. (1). Federal regulations require electronic submittal of all discharge monitoring reports (DMRs). ➢ Regulatory citations have been added to the permit. ➢ Outfall map has been updated. ➢ Language has been updated on the Supplement to Permit Cover Sheet based on current NPDES permit formatting. ➢ Limits have been added for Total Copper and Total Zinc based on a reasonable potential to exceed water quality standards, and monitoring has been increased to monthly. ➢ Turbidity monitoring has been increased to 2/month in Section A. (1). ➢ The footnote stating total copper and total zinc must be measured with acute toxicity has been removed in Section A. (1), as effluent characteristics are no longer required to be measured in conjunction with toxicity tests. ➢ The footnote for total residual chlorine has been updated in Section A. (1). ➢ Monitoring for manganese and total chloride have been added per the current water treatment plant guidance. ➢ The sample type has been changed from grab sample to composite sample in Section A. (1) for total dissolved solids, total suspended solids, salinity, conductivity, total copper, total zinc, ammoma nitrogen, and acute toxicity per the current water treatment plant guidance for ion exchange plants, and a footnote has been added. ➢ The language in Section A. (2) has been updated. State of North Carolina I Environmental Quality I Water Resources 1617 Mail Service Center I Raleigh, NC 27699-1617 919 807 6300, 919-807-6389 FAX https //deq nc gov/aboubdivisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits With this notification, the Division will solicit public comment on this draft permit by publishing a notice in newspapers having circulation in the general Tyrrell County area, per EPA requirements. Please provide your comments, if any, to me no later than 30 days after receiving this draft permit. Following the 30 -day public comment period, the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning the draft, please contact me at 919-807-6333, or via e-mail [Brianna.Young@ncdenr.gov]. Sincerely, Brianna Young Compliance and Expedite ermitting Unit cc: NPDES Files ec: Washington Regional Office WSS/Aquatic Toxicology Branch Permit NC0007510 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF WATER RESOURCES PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, the Town of Columbia is hereby authorized to discharge wastewater from a facility located at the Columbia Water Treatment Plant 606 North Light Street Columbia Tyrrell County to receiving waters designated as an unnamed tributary to the Scuppernong River in the Pasquotank River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, and III. The permit shall become effective. This permit and the authorization to discharge shall expire at midnight on December 31, 2022. Signed this day. Linda Culpepper Interim Director, Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 7 Permit NC0007510 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. The Town of Columbia is hereby authorized to: 1. Continue to operate a water treatment plant with a discharge of backwash and rinse wastewater from Greensand and Ion Exchange units. This water treatment plant currently has a design potable flowrate of 0.72 MGD, and a maximum monthly average wastewater discharge of approximately 0.0 19 MGD. This facility is located at the Columbia Water Treatment Plant, at 606 North Light Street, Columbia, in Tyrrell County. Water and wastewater treatment consists of. o Two (2) 250 gpm greensand filters with permanganate feed systems o Two (2) 250 gpm ion exchange units with brine regeneration systems o One (1) common potable backwash meter o One (1) 20,000 gallon wastewater settling basin o Potable water chemical additive systems for chloramines and corrosion inhibitor o Dechlorination chemical addition system 2. Discharge from said treatment works at the location specified on the attached map into an unnamed tributary to the Scuppernong River [Stream Index: 30-14-4-(9)], a waterbody currently classified as SC waters in subbasin 03-01-53 [HUC: 0301020502] in the Pasquotank River Basin. Page 2 of 7 Permit NC0007510 PART I A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] During the period beginning on the effective date of this permit and lasting until expiration, the permittee is authorized to discharge backwash/rinse wastewater from Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT CHARACTERISTICS (Parameter Code) EFFLUENT LIMITS MONITORING REQUIREMENTS Monthly Average Daily Measurement Sample Type Sample Maximum Frequency Location 2 Flow, MGD 3 50500 2/Month Instantaneous 3 E Salinity, t 00480 Monthly Composite 5 E, U, D Conductivity, mhos/cm 00094 Monthly Composite 5 E, U, D PH (00400) Not less than 6 8 S.0 nor greater than 8.5 S.U. 2/Month Grab E H, S.U. 00400 2/Month Grab U, D Total Dissolved Solids, m /L 70295 Monthly Composite 5 E Total Suspended Solids 00530 30.0 m /L 45.0 m /L 2/Month Composite 5 E Total Residual Chlorine a 50060 r' 13 /I 2/Month Grab E Turbidity 00070 2/Month Grab E Total Chloride 00940 Monthly Composite 5 E Total Manganese 01055 Monthly Composite 5 E Total Copper J01040) 3.70 /L 5.80 wqlL Monthly Composite 5 E Total Zinc 01092 85 6 /L 951' /L Monthly Composite 5 E Ammonia as Nitrogen, m /L 00610 1 Monthly Composite 5 1 E Acute Toxics s TGE3E Monitor & Report Quarterly Composite 5 E Footnotes: 1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR application system [see,A. (3)]. 2 E -Effluent, U -Upstream approximately 100 feet, D -Downstream approximately 100 feet. 3. Duration of each discharge must be noted in log book and available for review. The total daily flow volume (MGD) must be reported on the DMR. 4. Limit and monitor only if the facility adds chlorine or chlorine derivatives to water that is eventually discharged. The Division shall consider all effluent TRC values reported below 50 gg/L to be in compliance with the permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory (including field certified), even if these values fall below 50 gg/L 5 A composite sampler must be installed within 24 months of the date of permit issuance, or another method must be approved by the Washington Regional Office Water Quality Regional Operations Section in accordance with 15A NCAC 02B .0503 (4). 6. Acute Toxicity 24 -hr Pass/Fall Monitoring: January, April, July, and October. Permittee shall use mysid shrimp as the test organism unless another organism of equal or greater sensitivity is deemed more appropriate based on the characteristics of the discharge and receiving stream. See Special condition A. (2) for details. ALL SAMPLES COLLECTED SHOULD BE FROM A REPRESENTATIVE DISCHARGE EVENT. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Page 3 of 7 Permit NC0007510 A. (2) ACUTE TOXICITY PASS/FAIL MONITORING (QUARTERLY) [15A NCAC 02B .0500 et seq.] The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A Single Effluent Concentration" (Revised -December 2010 or subsequent versions). The monitoring shall be performed as a Mysid Shrimp (Mysidopsis Bahia) 24 hour static test. The effluent concentration at which there may be at no time significant acute mortality is 90% (defined as treatment two in the procedure document). The tests will be performed during the months of January, April, July, and October. These months signify the first month of each three month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during representative effluent discharge and shall be performed at the NPDES 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 TGE3E. Additionally, DWR Form AT -2 (original) -is to be sent to the following address: Attention: North Carolina Division of Water Resources Water Sciences Section/Aquatic Toxicology Branch 1621 Mail Service Center Raleigh, NC 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30 days after the end of the reporting period for which the report is made. 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 there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Water Sciences Section at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test requirement will revert to quarterly in the months specified above. Should any test data from either these monitoring requirements or tests performed by the North Carolina Division of Water Resources 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 follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. Page 4 of 7 Permit NC0007510 USE OF A DIFFERENT TEST ORGANISM The permittee may request the use of a different test organism upon documentation that the alternate test organism would provide an equal or greater level of protection and is appropriate based on the characteristics of the discharge and receiving stream. Such documentation would consist of one of the following: 1. For saltwater classified streams, a fathead minnow may be assigned as the acute testing species if the salinity of the receiving stream at the point of discharge is <5 ppt throughout the tidally influenced cycle. This determination may be based on the best professional judgment of DWQ staff or data collection provided by the permittee and approved by DWQ staff. This evaluation should include vertical profiles of salinity/conductivity measurements at both high tide and low tide over several 24 hr cycles. 2. Three consecutive "side-by-side" tests with results indicating that the alternate test organism is as or more sensitive to the facility's effluent. Each test series would consist of two separate toxicity tests conducted on the same sample of effluent with the length of exposure specified by the permit, the only difference between the tests being the organism used. 3. An alternate plan developed by the permittee and approved by the Aquatic Toxicology Unit that demonstrates an equal level of protection is offered by the test organism. . For items 2 and 3, it must also be demonstrated that viable and standardized culture techniques are available for that organism and standardized testing methodologies have been developed and validated. This demonstration should meet guidance provided by EPA in Section 6 of EPA -821-R-02- 012, Short Term Methods for Estimating the Acute Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fifth Edition, 2002. A. (3) ELECTRONIC REPORTING OF MONITORING REPORTS [NCGS 143-215.1 (b)] Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21, 2015. NOTE: This special condition supplements or supersedes the following sections within Part II of this permit (Standard Conditions for NPDES Permits): • Section B. (11.) • Section D. (2.) • Section D. (6.) • Section E. (5.) Signatory Requirements Reporting Records Retention Monitoring Reports 1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1 The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application. Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring Page 5 of 7 Permit NC0007510 data and submit DMRs electronically using the internet. Until such time that the state's eDMR application is compliant with EPA's Cross -Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR to the following address: NC DEQ / Division of Water Resources / Water Quality Permitting Section ATTENTION: Central Files 1617 Mail Service Center Raleigh, North Carolina 27699-1617 If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being physically located in an area where less than 10 percent of the households have broadband access, then a temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1. 1, 2, 3) or alternative forms approved by the Director. Duplicate signed copies shall be submitted to the mailing address above. See "How to Request a Waiver from Electronic Reporting" section below. Regardless of the submission method, the first DMR is due on the last day of the month following the issuance of the permit or in the case of a new facility, on the last day of the month following the commencement of discharge. Starting on December 21, 2020, the permittee must electronically report the following compliance monitoring data and reports, when applicable: • Sewer Overflow/Bypass Event Reports; • Pretreatment Program Annual Reports; and • Clean Water Act (CWA) Section -1 16(b) Annual Reports. The permittee may seek an electronic reporting waiver from the Division (see "How to Request a Waiver from Electronic Reporting" section below). 2. Electronic Submissions In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time of each electronic submission. The permittee should use the EPA's website resources to identify the initial recipient for the electronic submission. Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity (EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity for receiving electronic NPDES data [see 40 CFR 127.2(b)]. EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of electronic submission and for each state. Instructions on how to access and use the appropriate electronic reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at: https://www.federalre igister.gov/documents/2015/10/22/2015-24954/national- pollutant-discharge-elimination-systein-npdes-electronic-reporting-rule. Electronic submissions must start by the dates listed in the "Reporting Requirements" section above. 3. How to Request a Waiver from Electronic Reporting Page 6 of 7 Permit NC0007510 The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the Division. Requests for temporary electronic reporting waivers must be submitted in writing to the Division for written approval at least sixty (60) days prior to the date the facility would be required under this permit to begin submitting monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data and reports shall be submitted electronically to the Division unless the permittee re -applies for and is granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request may submit monitoring data and reports on paper to the Division for the period that the approved reporting waiver request is effective. Information on eDMR and the application for a temporary electronic reporting waiver are found on the following web page: http://deq.ne.gov/about/divisions/water-resources/edmr 4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1 All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (I 1.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting purposes. For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and login credentials to access the eDMR system. For more information on North Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following web page: http://deq.ne.gov/about/divisions/water-resour-ces/edmr Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE ACCEPTED: "I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations. " 5. Records Retention [Supplements Section D. (6.)] The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These records or copies shall be maintained for a period of at least 3 years from the date of the report. This period may be extended by request of the Director at any time [40 CFR 122.41 ]. Page 7 of 7 1 _ / _ _'. - _ •_ �, . - '+" ~'.y„ _ �.� .yp' ..,- �, .,` -ter r -� .� - r •r- -kms '+.• __ .w. 11 i O N G z (E) a• - Outfall (E� . Poul 4 . i I COLUMBIA �I• l�. \ ♦ (BM 51 ,I:.` ' ,. l `\ PilinII\• CO• BIA� a .��» 01 ._ 64 0• .. 64 64 64 •� �� 64 64 64 64 64 P OUTFALL n DOWNSTREAM UPSTREAM„ y46 ' — — O IDD - i Town of Columbia N Columbia WTP NPDES Permit NC0007510 Cq cation Facilfnot Receiving Stream: UT to Scuppernong River Stream Class: SC scalshown Stream Segment: 30-14-4-(9) Sub-Basin #: 03-01-53 River Basin: Pasquotank HUC: 0301020502 SCALE USGS Quad: Columbia East County: Tyrrell 1:24,000 35.922780, -76.248890 DEQ/DWR FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES PERMIT NC0007510 BACKGROUND The Town of Columbia operates a Water Treatment Plant (WTP) that produces potable water from well water using greensand filters, water softeners, and chemical additives, with a potable design capacity of 0.72 MGD. The intermittent backwash and rinse for the greensand filters and softeners use potable water as their source, and generate the wastewater discharge to an unnamed tributary to the Scuppernong River, a class SC water in the Pasquotank River Basin. Based on the reported DMR flows from July 2014 through July 2017, the maximum monthly average wastewater discharge is approximately 0.019 MGD. PROCESS From previous renewal: Potassium permanganate is added to the well water prior to the greensand filters. The filtered water continues to the softeners and then to the potable water system where it is disinfected with chloramines, fluorinated, and treated with a non -zinc phosphate corrosion inhibitor. A meter is used to monitor the potable water used for all backwash activities. Backwash and rinse events are initiated by the operator and are collected in a 20,000 gallon settling basin where a liquid dechlorination chemical is added. Once the basin is full it overflows via a gravity drain pipe to the outfall. The collected solids in the basin are removed as needed, usually annually. COMPLIANACE Daily max exceedances occurred from August 2012 through August 2017 for TRC, but all BPJ'd as all violations were less than 50 ug/L. Fact Sheet NPDES NC0007510 Page 1 of 2 Facility Information Applicant/Facility Name: Town of Columbia/Columbia WTP Applicant Address: PO Box 361, Columbia, NC 27925 Facility Address: 606 North Light Street, Columbia, NC 27925 Permitted Flow: Maximum monthly average last 36 months: approx. 0.019 MGD Type of Waste: Backwash/rinse wastewater from greensand filters & softeners Facility/Permit Status: Class PC -1 /Active; Renewal County: Tyrrell Count Miscellaneous Receiving Stream: UT to Scuppernong River Stream Classification: SC Subbasin: 03-01-53 Index No.: 30-14-4-(9) Drainage Area mit . - HUC: 0301020502 Summer 7Q 10 cfs : tidal 303(d) Listed?: No Winter 7Q 10 cfs : tidal Regional Office: Washington 30Q2 cfs : tidal USGSQuad: Columbia East, NC Average Flow cfs : tidal Permit Writer: Brianna Young IWC (%): 100% Date: 12/11/17 BACKGROUND The Town of Columbia operates a Water Treatment Plant (WTP) that produces potable water from well water using greensand filters, water softeners, and chemical additives, with a potable design capacity of 0.72 MGD. The intermittent backwash and rinse for the greensand filters and softeners use potable water as their source, and generate the wastewater discharge to an unnamed tributary to the Scuppernong River, a class SC water in the Pasquotank River Basin. Based on the reported DMR flows from July 2014 through July 2017, the maximum monthly average wastewater discharge is approximately 0.019 MGD. PROCESS From previous renewal: Potassium permanganate is added to the well water prior to the greensand filters. The filtered water continues to the softeners and then to the potable water system where it is disinfected with chloramines, fluorinated, and treated with a non -zinc phosphate corrosion inhibitor. A meter is used to monitor the potable water used for all backwash activities. Backwash and rinse events are initiated by the operator and are collected in a 20,000 gallon settling basin where a liquid dechlorination chemical is added. Once the basin is full it overflows via a gravity drain pipe to the outfall. The collected solids in the basin are removed as needed, usually annually. COMPLIANACE Daily max exceedances occurred from August 2012 through August 2017 for TRC, but all BPJ'd as all violations were less than 50 ug/L. Fact Sheet NPDES NC0007510 Page 1 of 2 PERMITTING STRATEGY Reasonable Potential Analysis (RPA) The Division conducted EPA -recommended analyses to determine the reasonable potential for copper and zinc to be discharged in excess of their water quality standard (WQS). DMR data from January 2013 to July 2017 was evaluated and results suggest reasonable potential for the facility to discharge copper and zinc in excess of WQS. Limits have been added to the permit and monitoring has been increased to monthly according to the 2009 WTP strategy. Whole Effluent Toxicity The permit requires quarterly acute toxicity testing using mysidopsis Bahia, at 90% effluent concentration. The facility has failed 2 of their last 12 toxicity tests (January 2016 and July 2016), and have passed their last 4 toxicity tests. Quarterly acute toxicity testing will continue. SUMMARY OF PROPOSED CHANGES • eDMR language added to A(1) and as Section A(3) • Regulatory citations added • Outfall map updated • Added stream characteristics to Supplement to Permit Cover Sheet • Limits added for copper and zinc based on RPA and monitoring increased to monthly • Removed footnote from A(1) "Total copper and total zinc must be measured in concert with acute toxicity" as this is no longer required. • Updated TRC footnote in A(1) • Turbidity monitoring increased to 2/month per 2009 WTP strategy • Monitoring for manganese (ion exchange and greensand) and total chloride (ion exchange) added per 2009 WTP strategy; no explanation given in 2008 renewal for why removed o Per 2012 strategy update: WTPs not discharging to WS streams should maintain monthly monitoring for IE plants for manganese • Sample type changed from grab to composite for TDS, salinity, conductivity, TSS, total copper, total zinc, total manganese, ammonia nitrogen, and toxicity per 2009 WTP strategy for ion exchange plants (more stringent than greensand strategy) o After conversations with WaRO, footnote added stating "A composite sampler must be installed within 24 months of the date of permit issuance, or another method must be approved by the Washington Regional Office Water Quality Regional Operations Section in accordance with 15A NCAC 02B .0503 (4)." • Updated language in A(2) PROPOSED SCHEDULE FOR PERMIT ISSUANCE Draft Permit to Public Notice: December 13, 2017 Permit Scheduled to Issue: NPDES DIVISION CONTACT If you have questions regarding any of the above information or on the attached permit, please contact Brianna Young at (919) 807-6333 or email brianna.young@ncdenr.gov. REGIONAL OFFICE COMMENTS Fact Sheet NPDES NC0007510 Page 2 of 2