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Home My WebLink AboutNC0088820_Permit (Issuance)_20131101NPDES DOCYNENT !MCANNIN`: COVER SHEET NPDES Permit: NC0088820 Pender County WTP Document Type: Permit Issuance -4) Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Staff Report Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: November 1, 2013 This document is priated on reuse paper - ignore any content oa the reverse side ATA NCDENR North Carolina Department of Environment and Natural Resources Division of Water Resources Water Quality Programs Pat McCrory Thomas A. Reeder John E. Skvarla, III Governor Director Secretary November 1, 2013 Mr. Michael G. Mack, Director Pender County Utilities P.O. 995 Burgaw, North Carolina 28425 Subject: NPDES Final Permit Permit NC0088820 Pender County WTP Pender County Class I Facility Dear Mr. Mack: Division personnel have reviewed and approved your application for renewal of the subject permit. Accordingly, we are forwarding the attached NPDES 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 October 15, 2007 (or as subsequently amended). The final permit contains the following changes from your previous permit: • Monitoring for ammonia was added to the effluent monitoring requirements. In addition a special condition was added to your permit including requirements for electronic reporting. Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and specify that, if a state does not establish a system to receive such submittals, then permittees must submit DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates that these regulations will be adopted and is beginning implementation. The requirement to begin reporting discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application has been added to your final NPDES permit. [See Special Condition A (3)] For information on eDMR, registering for eDMR and obtaining an eDMR user account, please visit the following web page: 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807-63001 FAX: 919-807-6492 Internet www.ncwaternuality.orq NorthCarolina 7atura!!rj An Equal Opportunity 1 Affirmative Action Employer Pender County Utilities November 1, 2013 Page 2 of 2 http://portal.ncdenr.org/web/wq/admin/bog/ipu/edmr. For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the following web site: http://www2.epa.gov/compliance/proposed-npdes-electronic-reporting-rule. If any parts, measurement frequencies or sampling requirements contained in this permit 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 (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division 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 Resources or permits required by the Division of Land Resources, the Coastal Area Management Act or any other federal or local governmental permits that may be required. If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone number (919) 807-6387 or at email Teresa.rodriguez@ncdenr.gov. Sincerely, 44 dytr Thomas A. Reeder cc: NPDES Files Central Files Wilmington Regional Office / Surface Water Protection Section Aquatic Toxicology Unit (e-copy) Permit NC0088820 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER RESOURCES PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision 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, Pender County is hereby authorized to discharge wastewater from a facility located at the Pender County WTP 289 Quality Way Wilmington Pender County to receiving waters designated as Cape Fear River in the Cape Fear River Basin in accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts 1, II, III and IV hereof. This permit shall become effective December 1, 2013. This permit and authorization to discharge shall expire at midnight on November 30, 2016. Signed this day November 1, 2013. • mas A. Reeder, Director /Division of Water Resources By Authority of the Environmental Management Commission Page 1 of 7 Permit NC0088820 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. Pender County is hereby authorized to: 1. Continue to operate a conventional water treatment plant with a discharge of spent filter backwash, sedimentations wastewater, and filter -to -waste water. This WTP has a design potable flowrate of 2.0 MGD and a monthly average wastewater discharge of 0.2 MGD. This facility is located at 289 Quality Way, in Wilmington near the New Hanover and Pender County line in Pender County and consist of: • Raw water meter and controls; • Storage and chemical feed systems for alum and/or ferric sulfate, caustic, corrosion inhibitor, sodium hypochlorite, fluoride, oxidant; • Two (2) rapid mix basins; • Two (2) trains, four stage flocculators; • Two (2) sedimentation basins with sludge withdrawal controls; • Four (4) gravity filters with backwash controls, sand and activated carbon media; • Filtered water collection sumps with pumps; • Four (4) GAC contactors and four (4) spare GAC contactors for future use; • Clearwell with pumps and spare clearwell for future use; • Two 1.5 MG (2) residual/equalization basins; • Effluent wastewater meter with recorder/totalizer; • Effluent recycle system; • Effluent wastewater pumps and piping; • and dechlorination system. 2. Discharge from said treatment works at the location specified on the attached map into the Cape Fear River, C, Sw classified waters in the Cape Fear River Basin. Page 2 of 7 Permit NC0088820 PART I A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge treated filter backwash wastewater and other treated wastewater from outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below: EFFLUENT CHARACTETISTICS LIMITS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample . Type Sample Location Flow Continuous Recording Effluent Total Suspended Solids (TSS) 30.0 mg/L 45.0 mg/L Weekly Grab Effluent pH Not greater than 9.0 S.U. nor less than • 6.0S.U. Weekly Grab Effluent Total Residual Chlorine (TRC) 2 28 Ng/L Weekly Grab Effluent Turbidity, NTU Weekly Grab Effluent Aluminum, mglL Quarterly Grab Effluent Fluoride, mg/L3 Quarterly Grab Effluent Total Copper, mg/L Quarterly .Grab Effluent Total Iron. mg/L Quarterly Grab Effluent Total Zinc, mg/L 4 Quarterly Grab Effluent Manganese, mg/L Quarterly Grab Effluent Kjeldahl Nitrogen, mg/L (TKN) Quarterly Grab Effluent Nitrite/Nitrate Nitrogen, mglL (NO2-N + NO3-N) Quarterly Grab Effluent Ammonia, mg/L Quarterly Grab Effluent Total Nitrogen, mg/L (TN) TN = (NO2-N + NO3-N) + TKN Quarterly Calculated Effluent Total Phosphorus, mg/L (TP) Quarterly Grab Effluent Acute Toxicity Test 5 Monitor and report Quarterly Grab Effluent Footnotes: 1. No later than 90 days from the effective date of this permit, begin submitting discharge monitoring reports electronically using NC DWR's eDMR application system. See Special Condition A. (3). 2. Total Residual Chlorine (TRC) compliance is required when chlorine or chlorine derivative disinfection occurs in water sources used in backwashing or otherwise become part of the facility wastewater. The Division shall consider all effluent TRC values reported below 50 µgL 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 mg/L. 3. If fluorinated finished water is used for backwashing then fluoride monitoring is required. 4. If zinc orthophosphate or other zinc -based corrosion inhibitor is added to the water used for filter backwash then total zinc monitoring is required. 5. Acute Toxicity, 24 hr. static P/F, TGF6C (Primepales promelas) at 90%; February, May, August, and November. All Effluent Characteristics shall be monitored in conjunction with toxicity test. See Special Condition A. (2.). All samples must be collected during a typical discharge event from this facility's effluent. There shall be no discharge of floating solids or visible foam in other than trace amounts. Page 3 of 7 Permit NC0088820 A. (2) ACUTE TOXICITY PASS/FAIL MONITORING (QUARTERLY) 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 Fathead Minnow (Pimephales promelas) 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 February, May, August and November. 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. The parameter code for Pimephales promelas is TGE6C. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Form (MR-1) for the month in which it was performed, using the appropriate parameter code. Additionally, DWR Form AT-2 (original) is to be sent to the following address: Attention: North Carolina Division of Water Resources Environmental Sciences Section 1621 Mail Service Center Raleigh, N.C. 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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 any month, 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 Environmental 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 Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. If the Permittee monitors any pollutant more frequently than required by this permit, the results of such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Form submitted. 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 NC0088820 A. (3.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and specify that, if a state does not establish a system to receive such submittals, then permittees must submit DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates that these regulations will be adopted and is beginning implementation in late 2013. NOTE: This special condition supplements or supersedes the following sections within Part II of this permit (Standard Conditions for NPDES Permits): • Section B. (11.) Signatory Requirements • Section D. (2.) Reporting • Section D. (6.) Records Retention • Section E. (5.) Monitoring Reports 1. Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)1 Beginning no later than 90 days from the effective date of this permit, the permittee shall begin reporting 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 data and submit DMRs electronically using the intemet. 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 DENR / DWR / Information Processing Unit ATTENTION: Central Files / eDMR 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. Requests for temporary waivers from the NPDES electronic reporting requirements 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 using eDMR. Temporary waivers shall be valid for twelve (12) months and shall thereupon expire. At such time, DMRs shall be submitted electronically to the Division unless the permittee re -applies for and is granted a new temporary waiver by the Division. Information on eDMR and application for a temporary waiver from the NPDES electronic reporting requirements is found on the following web page: http:llportal.ncdenr.org/web/wq/admin/bog/ipu/edmr 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. 2. 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. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting purposes. Page 5 of 7 Permit NC0088820 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://portal.ncdenr.org/web/wq/admin/bog/ipu/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: "1 cert, 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." 3. Records Retention [Supplements Section D. (6.)1 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 6 of 7 Permit NC0088820 Outfall 001 AN- Pender County WTP— NC0088820 Pender County Receiving Stream: Cape Fear River Stream Class: C, Sw Drainage Basin: Cape Fear River Basin Sub -Basin: 03-06-17 Permitted Flow 0.2 MGD RUC: 03030005 State Grid/TAGS Quad: J26SE, Leland NC Location (Not to scale) N , X Lai itude34° 19' 25.5"N Longitude: 7S`0'49.S"\V Page 7 of 7 AFFIDAVIT OF PUBLICATION STATE OF NORTH CAROLINA COUNTY OF NEW HANOVER Public Notice North Carolina Environmental Management Commission/ NPDES Unit 1617 Mail Service Center Raleigh, NC 27699-1617 Notice of Intent to Issue a NPDES Wastewater Permit The North Carolina Environmental Management Commission proposes to issue a NPDES wastewater dis- charge permit to the person(s) listed below. Written comments re- garding the proposed permit will be accepted until 30 days after the publish date of this notice. The Di- rector of the NC Division of Water Resources (DWR) may hold a public hearing should there be a signifi- cant degree of public interest. P 2ase mail comments and/or in- formation requests to DWR at the above address. Interested persons may visit the DWR at 512 N. Salis- bury Street, Raleigh, NC to review information on file. Additional in- formation on NPDES permits and this notice may be found on our website: http://portal. ncdenr.org/web/wq/ swp/ps/npdes/calend a r or by calling (919) 607-6390. Pen - der County Utilities Department re- quested renewal of NPDES permit, NC0088820, for Pender County WTP in Pender County; discharge is treated filter backwash and other wastewater to Cape Fear River, Cape Fear River Basin. Before the undersigned, a Notary Public of Said County and State, Anita Thomas Who, being duly sworn or affirmed, according to the law, says that he/she is Publisher's Assistant of THE STAR -NEWS, a corporation organized and doing business under the Laws of the State of North Carolina, and publishing a newspaper known as STAR -NEWS in the City of Wilmington Public Notice North Carolina Environmental Management Commission/NPDES Unit 1617 Mail Service Center Raleigh, NC 27699-1617 Notice of Intent to Issue a NPDES Wastewater Permit The North Carolina Environmental Management Commission proposes to issue a NP was inserted in the aforesaid newspaper in space, and on dates as follows: 9/14 ix And at the time of such publication Star -News was a newspaper meeting all the requirements and qualifications prescribed by Sec. No. 1-597 G.S. of N.C. — Title: Publisher's //Assistant S wor or a 'firmed to, and subscribed before me this %1!/ Imo! day of , A.D., 0-0 /3 aµ46i14444e��,F In Testimony Whereof, I have hereunto set my hand and affixed my officia� d th�.,cj+� ►6'04, 00 year aforesaid. e AClif—k My commission expires ( � k day of , 20 a0TAi��, n Nett Publicj� PUBL\G , .�;�ssaid�, Gam.. Upon reading the aforegoing affidavit with the advertisement thereto annexed it is adjudged by the Court that the "% publication was duly and properly made and that the summons has been duly and legally served on the defendant(s). 1 This day of MAIL TO: Clerk of Superior Court Rodriguez, Teresa From: Michael Mack <mmack@pendercountync.gov> Sent: Wednesday, September 04, 2013 5:10 PM To: Rodriguez, Teresa Subject: RE: NPDES permit NC0088820 Ms. Rodriguez: That is correct. The permit is used for the discharge from our new Surface Water Treatment Plant. The WTP began testing and start up in September 2012 and formally went on-line December 15, 2012. Please let me know if you have any additional questions about our renewal. Thank you. michael Michael G. Mack, Director Pender County Utilities Pender Solid Waste Pender County Public Works P.O. Box 995 605 E. Fremont Street Burgaw, NC 28425 Wk: 910-259-1570 Fx: 910-259-1579 Please note that email sent to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the system manager. Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of the company. From: Rodriguez, Teresa[mailto:Teresa.Rodriguez(ancdenr.gov] Sent: Wednesday, September 04, 2013 1:28 PM To: Michael Mack Subject: NPDES permit NC0088820 Michael, I am doing the renewal for the Pender Co NPDES permit. I would like to verify when the wastewater treatment system and the discharge began, our records show September of 2012. Thanks Teresa Teresa Rodriguez NPDES Complex Permitting Unit NCDENR/Division of Water Resources T. 919-807-6387 F. 919-807-6489 1 DENR/DWQR FACT SHEET FOR NPDES PERMIT DEVELOPMENT NPDES No. NC0088820 Facility Information Applicant/Facility Name: Pender County / Pender County WTP Applicant Address: 605 E. Freemont Street; Burgaw, North Carolina 28425 Facility Address: 289 Quality Way, Wilmington, North Carolina Flow: Phase I 0.2 MGD, phase II max 0.9 MGD Type of Waste: Conventional WTP wastewater Facility/Permit Status: Class I /Renewal County: Pender County Miscellaneous Receiving Stream: Cape Fear River Stream Classification: C, Sw Subbasin: 03-06-17 HUC: 03030005 Drainage Area (mi2): 7040 Index No. 18-(63) Summer 7Q10 (cfs) 918 (*calculated) 303(d) Listed? No Winter 7Q10 (cfs): NA Regional Office: Wilmington 30Q2 (cfs) NA State Grid / USGS Quad: J26SE Leland, NC Average Flow (cfs): 8142 (*calculated) Permit Writer: Teresa Rodriguez IWC (%): < 0.15% Date: 9/3/2013 *Used NC000663 data, USGS designates this stream as tidal and does not provide flow data BACKGROUND The permit for the Pender County WTP was issued on March 2010 with an expiration date of November 30, 2013. The new expiration date of November 30, 2016.the expiration date will be in agreement with the Cape Fear basin schedule. This permit is being renewed with minor changes. An Authorization to Construct for the wastewater treatment facilities at the Pender County WTP was issued on July 2010. An engineering certification for the construction was received on November 19, 2012. The facility commenced testing the new system on September 2012 and went on-line on December 15, 2012. The Pender County WTP is a conventional drinking water treatment plant providing service to the Pender County area discharging into a tidal freshwater segment of the Cape Fear River. Two construction phases are planned, phase I allows for an initial 2.0 MGD water treatment capacity while phase II allows for an expansion to a 6.0 MGD water treatment capacity. Potentially, the original plant 2.0 MGD capacity may be eligible for a treatment capacity -upgrade:-On-the-average--approximately-10%-of -the treatment -capacity- will -be -needed for- backwashing with an anticipated peak wastewater discharge of 0.9 MGD at the 6.0 MGD capacity. PROCESS DESCRIPTION The Lower Cape Fear Water and Sewer Authority operates a pumping station with a piping network located 21 miles upstream of Wilmington and just upstream of lock and dam 1 on the Cape Fear River. The line extends to the Pender County WTP site where based on demand the raw water will be introduced to the treatment plant. A dual treatment train approach is used for capacity control and operational efficiency. Fact Sheet NPDES NC0088820 Page I of 3 As the raw water enters either train's rapid mixers various chemical are added to initiate flocculation, disinfection, and pH. The raw water continues through a series of flocculators where more chemicals are added and the further enhancement to remove the solids occurs. Next the raw water enters two sedimentation basins where the overflow raw water flows to the train's four gravity filters. A sand and activated charcoal media make up the filter bed. The filtered water is pumped from each filters collection well, through GAC contactor filters, and into the clearwell. Corrosion inhibitor, fluoride, disinfection (chlorine) and pH adjustment chemicals are added to the combined filter collection well and the clearwell. Ammonia is also added to the clearwell to further enhance the disinfection. A finished water pump transfer the drinking water from the clearwell and into the distribution and storage system. The filters require routine backwashing and are backwashed with the filtered water from the filter water collection wells. The backwash wastewater is accumulated in one of two 1.5 MGD retention ponds. These ponds are also used to collect the settled solids that accumulate in the sedimentation basin. The flow will be alternated between the ponds to allow for separation of the solids. As needed the liquid portion is removed from a pond and either a portion, 10% maximum, diverted as recycled back to the treatment works or further dechlorinated before being pumped 4,000 feet into an existing Cape Fear River discharge pipe on the adjacent property, formerly BASF. The actual Cape Fear River discharge point is approximately 3,400 feet beyond the WTP. Current plans are to wait until significant solids have accumulated in a pond and then take that pond out of service for cleaning by a contractor. Other future alternatives for solids removal are under consideration. WTP PERMITTING STRATEGY The "NPDES Permitting Strategies For Potable Water Treatment Plants" guidelines for conventional water treatment were applied. There is no permitted flow limit requirement. However, the facility will be required to have a recorder to provide the total gallons of wastewater discharged. Based on BPJ for this tidal receiving stream, Cape Fear River, an effluent TRC limit of 28 µg/1 was included in the permit. The permit also included limits on TSS of 30 mg/1 monthly average and 45 mg/1 daily max and pH of 6 to 9 SU. An acute toxicity monitoring test using fathead minnow at 90% effluent concentration is required. Since this segment of the river is not impaired for turbidity then effluent turbidity monitoring only is required. There is a potential for a zinc -based corrosion inhibitor to be present in the backwash water so conditional zinc monitoring was included in the permit. The permit includes monitoring for total copper, fluoride, total iron, aluminum, manganese, nitrite/nitrate nitrogen, total kjeldahl nitrogen, total nitrogen, and total phosphorus. DATA REVIEW The wastewater treatment system went on line on December 2012. Since this time flow has averaged 0.246 MGD, turbidity averaged 2 NTU, pH ranged between 6.8 and 9 SU, TSS averaged 3.1 mg/1, and TRC averaged 22 ug/1. The facility passed all the toxicity tests (total of 3 tests). Fact Sheet NPDES NC0088820 Page 2 of 3 PROPOSED CHANGES TO CURRENT PERMIT 1. Following WTP permitting guidance ammonia monitoring on a quarterly basis was added to the permit. PROPOSED SCHEDULE FOR PERMIT ISSUANCE Draft Permit to Public Notice: September 10, 2013 Permit Scheduled to Issue: November 4, 2013 NPDES DIVISION CONTACT If you have questions regarding any of the above information or on the attached permit, please contact Teresa Rodri ez at (919) 807-6387 or email teresa.rodriguez cdenr.gov. NAME: i DATE: 9 `( REGIONAL OFFICE COMMENTS NAME: DATE: SUPERVISOR: DATE: Fact Sheet NPDES NC0088820 Page 3 of 3 PENDER COUNTY UTILITIES 605 E. Fremont Street P.O. Box 995 Burgaw, NC 28425 Phone - 910.259.1570 Fax - 910.259.1579 May 10, 2013 North Carolina Department of Environment and Natural Resources Division of Water Quality/NPDES Unit 1617 Mail Service Center Raleigh, NC 27699-1617 Re: Pender County Utilities — Surface Water Treatment Plant NPDES Permit, NC0088820 Renewal Application To Whom It May Concern: Please find the enclosed NPDES Permit Application — Short Form C — WTP, required for renewing the current permit with an expiration date of November 30, 2013. Along with the application, please also find a hydraulic profile of the plant process detailing flows and chemical application points. Please let me know if you have any questions about this application renewal. Michael G. Mack Director NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants Mail the complete application to: N. C. Department of Environment and Natural Resources Division of Water Quality / NPDES Unit 1617 Mail Service Center, Raleigh, NC 27699-1617 NPDES Permit Number NC0088820 If you are completing this form in computer use the TAB key or the up - down arrows to move from one field to the next. To check the boxes, click your mouse on top of the box. Otherwise, please print or type. 1. Contact Information: Owner Name Pender County Facility Name Pender County Surface Water Treatment Plant Mailing Address City State / Zip Code Telephone Number Fax Number e-mail Address Mr. Michael G. Mack, Director - Pender County Utilities Department - PO Box 995 Burgaw NC 28425 (910) 663-3637 (910) 259-1579 mmack@pendercountync.gov 2. Location of facility producing discharge: Check here if same as above 0 Street Address or State Road City State / Zip Code County 289 Quality Way Wilmington NC 28401 Pender 3. Operator Information: Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to the Operator in Responsible Charge or ORC) Name Pender County Utilities Mailing Address PO Box 995 City State / Zip Code Telephone Number Fax Number 4. Ownership Status: Federal ❑ Page 1 of 8 Burgaw NC 28425 (910) 663-3637 (910) 259-1579 State ❑ Private ❑ Public El C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants 5. Type of treatment plant: ® Conventional (Includes coagulation, flocculation, and sedimentation, usually followed by filtration and disinfection) ❑ Ion Exchange (Sodium Cycle Cationic ion exchange) ❑ Green Sand Filter (No sodium recharge) ❑ Membrane Technology (RO, nanofiltration) Check here if the treatment process also uses a water softener ❑ 6. Description of source water(s) (Le. groundwater, surface water) The raw water source is the Cape Fear River. A 36 inch raw water pipe will tie-in to the existing Lower Cape Fear Water and Sewer Authority's (LCFWASA) raw water main to the proposed Pender County Surface Water Treatment Plant. The analysis of the source water collected as well as additional information related to the source water is included in Appendix A through D. 7. Describe the treatment process(es) for the raw water: The recommended treatment process for the Pender County Surface WTP is based on conventional treatment. Construction of the new WTP will be phased. Phase 1 will include a 2 mgd WTP with a 24-inch finished water transmission main. The 2 mgd plant under Phase 1 will have the infrastructure (concrete and building) in place for rapid expansion by equipment addition to a 6.0 mgd capacity plant under Phase 2. Further permitting including an EA or EA Amendment will be required to increase the capacity in the future to 6 mgd and/or for an interim capacity of 4.5 mgd. The treatment will require up to 10 percent water usage for filter backwashing, sedimentation solids drainage and other uses. Appendix E includes a preliminary schematic flow through the facility, including flow volumes at all points in the treatment process, and points of addition of chemicals. Principal plant features include: Raw Water Piping A raw water transmission main will be installed to connect the proposed Pender County Surface WTP to the existing LCFWASA's raw water supply pipe. Flow control will be accomplished by valve throttling. Pretreatment Pretreatment consists of chemical addition, rapid mixing, flocculation, and sedimentation. Up to 10 percent allowance for water losses due to filter backwash, filter -to -waste, sedimentation basin solids removal, and other miscellaneous uses at the WTP are being accounted for while calculating the net capacity of the plant. The preliminary design concept includes one rapid mix train; two flocculation trains, each flocculation train having four compartments to allow tapered energy flocculation; and two longitudinal sedimentation basin. The sedimentation basin has chain and flight solids collection equipment. A discussion of the major plant process components follows. Rapid Mix Two rapid mix basins will be provided. This allows series dosing of coagulant followed by caustic and/or polymer and redundancy. If one mixer is out of service the coagulant could be fed at the second mixer. Provisions will be made for feeding ferric or alum coagulant, polymer, and caustic to the rapid mix chambers. The rapid mix chambers will each be 5 feet x 5 feet x 8.2 feet water depth. Flocculation Two trains of four -stage flocculators will be provided. A baffle wall will separate each Page 2 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants flocculation stage. Each basin will be equipped with a vertical flocculator of the turbine type driven by a variable frequency drive (VFD). The four basins in series, each with separate VFD controls will allow for tapered energy flocculation, which will allow for optimization of the flocculation process. The flocculator walls are designed to create an over-under flow pattern and a serpentine pattern in the horizontal plane to minimize short-circuiting. Opening sizes will be designed to minimize floc breakup. Provisions will be made to feed polymer and caustic in the flocculation basins. Flow from each of the flocculation basins will pass to the sedimentation basin influent channel for distribution to the sedimentation units. Sedimentation Two sedimentation basins will be provided. Each basin will be equipped with solids collection equipment. The basins will have approximately 14.5-foot average side water depth at design flow. Solids will be collected by chain and flight collectors to hoppers located at one end of the tank. Solids will be manually or automatically withdrawn through the use of air lift pipes and drains to a view box, which will allow the operators to visually monitor the solids consistency in order to determine the length of time for solids removal and minimize discharge of clean water and maximize plant capacity. Water will flow from each sedimentation basin into a filter influent flume. Provisions will be made to feed chlorine, caustic, and polymer into the filter influent. Filters Four filters will be provided. Each filter cell will be 21.75 feet x 12 feet, having an area of 261 sf. The filters will be equipped with air water backwash, washwater troughs, sand, and GAC or anthracite media. Filter Hydraulics - Settled water enters the filter from the filter influent channel through an influent valve, flows into the inlet and backwash trough ports and is distributed over the filter bed. Filter Controls - The filters are designed with one effluent flow controller per filter consisting of a venturi type flow meter and an electrically operated butterfly control valve. The rate of flow through each filter will be manually set with an option for level control to match raw water flow using a single rate set load station. Controls will be electronic with electric valve operators. All filter operations will be from a local control panel at each filter with flows, head losses, and turbidity. Backwash System Finished water from the clearwell will be piped back to the filters for backwashing. This water will flow through the washwater header in the pipe gallery to the filter gullet, through the underdrain, and up through the filter media. A blower and air piping will be provided to allow air/water bed expansion and backwashing. This system is designed to wash one filter at a time. If the clearwell is out of service or at too low an elevation for backwashing, an emergency back-up backwash using water from the transfer pumps will be utilized. As an alternate to be considered during final design, backwashing from the high service system can be done through a pressure reducing valve. The backwash water will flow into the backwash troughs located above the expanded filter bed and into the waste backwash water collection channel. From there the backwash water flows to the residuals basins. Transfer Pump Station and Clearwells The transfer pump station will consist of three submersible pumps. Ductile iron pipe will be provided to convey filtered water from the transfer pump station at the WTP to the clearwells. The pipe will also convey wash water from the clearwells to the filters for filter backwashing. The submersible transfer pumps have rails to raise them as needed for easy access, although normal maintenance is only needed about once every two years. Since primary disinfection is by chlorination, the clearwells must provide sufficient Page 3 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants detention time to achieve the required disinfection, measured as disinfectant concentration times contact time (CT), for Giardia and virus inactivation. The clearwells must also provide water for filter backwashing and serve as a storage source. The clearwell design includes a 1-million gallon (MG) baffled precast concrete storage tank . The approximate split of purpose for the clearwells is to dedicate the lower half to disinfection and the upper to half for backwashing. Backwashing requires the head of the upper half to push the water through to the filters. Granular Activated Carbon (GAC) Pressure Contactors GAC will be placed in pressure contactors so only 1 pressure contactor is needed per mgd of treatment capacity. Chemical Building Facilities for feeding the following chemicals will be provided at the application points in Table 1. Table 1. Chemical Application Points Chemical Ferric Sulfate (or Alum) Caustic Soda (or Lime Slurry) Corrosion Inhibitor (Orthophosphate) Chlorine (Sodium Hypochlorite) Point of Application (typical points fed in bold) Rapid Mix Basins 1 and 2 Rapid Mix Basins 1 and 2, Flocculation Basin, Settled Water (SW) Channel, Clearwell Influent Clearwell Influent Rapid Mix Basins 1 and 2, SW Channel, Filter Effluent. Clearwell Influent, Clearwell Effluent Aqueous Ammonia (future, when needed) Clearwell Effluent Polymer Rapid Mix Basins 1 or 2, Flocculation Basins 1 and 2, SW Channel and SW Pipe Oxidant Raw water, Settled water (as needed) Ferric Sulfate - Ferric sulfate is provided as the primary coagulant and will be fed to the rapid mix basins. The design allows for alternate use of alum (aluminum sulfate). The ferric sulfate dose is expected to range from about 50 mg/L to 200 mg/L depending on the raw water quality with an average dose of roughly 60 mg/L. The proposed ferric sulfate facility will use one bulk storage tank with a provision to expand the chemical storage area in the future and two metering pumps with one pump serving rapid mix and one pump in standby. Caustic Soda - Caustic soda (NaOH) facilities are proposed to allow pH adjustment at the application points shown in Table 1. The caustic dose is expected to range from about 10 mg/L to 60 mg/L, with an average dose of 50 mg/L. Bulk storage facilities will include one chemical tank and an automatic dilution system to allow purchasing at 50 percent concentration for cost savings and diluting on -site to 25 percent to be less vulnerable to freezing and to make it less hazardous to handle. Tank size is to allow dilution and purchase of a full truckload of chemical with some additional volume to avoid being close to empty before filling. Three metering pumps will be provided. Typically, one will be on. Corrosion Inhibitor - Corrosion inhibitor dosing facilities are provided to help inhibit corrosion in the distribution system and help comply with the lead and copper rule. Plant staff should try different inhibitors and doses once on-line. For feed equipment initial sizing, the use of orthophosphate is assumed. The phosphate will be stored in a bulk tank. Two metering pumps will be provided, one of which will be a standby. Chlorine (Sodium Hypochlorite) - Chlorine is provided for pre -oxidation, disinfection, and distribution system residual disinfectant. One bulk storage tank will provide ample storage with the size needed to allow dilution and filling with a full truckload. Automatic dilution facilities will be provided to allow storage at 6 percent. The normal feed points are settled water for oxidation of iron and manganese and filtered water for primary disinfection and to provide a disinfectant residual. The rapid mix feed point is only for periodic basin cleaning since feeding to this point continuously would cause high levels of disinfection byproducts. Metering pumps will be provided. Page 4 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants Polymer - Polymer will be stored in 50-1b bags or 5-gal drums in the chemical storage area. The proposed feed system will consist of a batching system, feed tank and aging tank, and two metering pumps. Dry polymer will be transferred by hand. The metering pumps will pump liquid polymer from the feed tank to the feed points. The pumps will also allow use of a liquid polymer direct from the drum separate from the day tanks in case use of different polymers concurrently is needed. Two metering pumps will be provided. Oxidant - This system may be used for optional pre -oxidation as needed for events of high raw water manganese. Liquid peroxide or sodium permanganate will be used at this WTP. Storage may be in drums or bulk. Two metering pumps will be provided; one of which will be a standby. Aqueous Ammonia - Ammonia may need to be fed downstream of the clearwells in the future for disinfection by-product control. Initially, ammonia facilities will not be included since free chlorine is desired for compatibility with the groundwater systems. 8. Describe the wastewater and the treatment process(es) for wastewater generated by the facility: Treatment Process Residuals and Waste Washwater Disposal 1. Residuals Sources Provision of adequate residuals handling facilities and proper residuals management is critical to the successful operation of a WTP. The major sources of residuals include the sedimentation solids, spent filter backwash water, and filter -to -waste water. Suspended matter, color, and other impurities in the raw water are removed primarily during the coagulation/clarification process. A small amount of residuals not removed in the sedimentation basins is removed in the filters, and the solids are subsequently removed from the filters in the spent filter backwash water. 2. Residuals Quantity The quantity of residuals produced by the plant depends on the raw water quality, flow and the chemicals used to treat the raw water. Knowledge of water chemistry and extensive experience at operating other treatment plants has shown that a relationship exists between these factors that can be used to predict the amount of residual solids produced. By far, the majority of residuals produced in the plant come from the coagulation process. Other additives such as polymer can be assumed to produce amounts of residuals equivalent to the dosages added to the water. Suspended solids also produce an equivalent weight of residuals, as they are non -reactive. Iron and manganese (including manganese from permanganate) are oxidized in the treatment plant and are removed in the oxidized precipitate form. Therefore, the equation used to calculate the amount of solids produced is: S = 8.34 * Q (0.53C + SS + A +1.9Fe +1.58 Mn) (1) Where the parameter values used for calculations include, S = solids produced (lb/day) Q = average plant flow (mgd), 3.0 mgd C = average coagulant dose, 60 mg/L Fe2(SO4)3 SS = average raw water suspended solids (mg/L) b*Tu, where b = constant, assume 1.5 and Tu = average raw water turbidity in nephelometric turbidity units (NTU) = 39 mg/L A = additional chemicals added (mg/L), 2 mg/L for estimated annual average Fe = average raw water iron concentration (mg/L), 0.90 mg/L Mn = average raw water manganese concentration (mg/L), 0.1 mg/L The raw water suspended solids can be estimated from the raw water turbidity: SS (mg/L) = b* Tu as shown above The correlation factor between turbidity and suspended solids may vary from 0.7 to 2.2 and may seasonally vary for the same raw water supply. Since no suspended solids data was Page 5 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants available, the value of b was assumed to be 1.5 for the purpose of estimating the residuals quantity. Using equation (1) and the above parameter values, S = 1,900 dry lb /day. Based on our experience from other treatment plants, roughly 90 percent of the solids produced will end up in the sedimentation solids. The rest will be collected in the spent filter backwash water. 3. Waste Characteristics The sedimentation solids and spent filter backwash water have significantly different characteristics. Sedimentation solids flow is a relatively small flow with a higher solids concentration than backwash water, typically between 0.5 percent to 2 percent, depending on the raw water quality and coagulant conditions as well as the frequency and duration of solids removal. Sedimentation basin solids are removed each day and its removal can be timed to be proportional to the volume of water treated by each sedimentation basin. The approximately 10 percent of the solids not removed in the sedimentation basins will be removed by the filters and subsequently removed from the filter media during filter backwashing. Spent filter backwash water is discharged to the reclamation basins after each filter backwash. 4. Residuals Handling Approach The proposed two Residuals Basins will serve to receive the sedimentation solids, washwater from the sedimentation basins, filter backwash water, and filter -to -waste water. The residuals basins will be used for storage and as an equalization / clarification basin. In normal operation, backwash water and other high flows would be directed to one basin while the other basin functions as more of a polishing basin. When one basin is down for cleaning, the other basin would be decanted down prior to backwashing to capture the backwash and then allow it to settle before decanting. A thickener will not be necessary until the future when sludge is land applied or dewatered on -site. Once a basin reaches 5 percent solids concentration, bidding for contract removal is needed. Decant can be pumped using the recycle pump station to the raw water piping or flow to the pipe for discharge in accordance with a National Pollutant Discharge Elimination System (NPDES) permit. Residuals Basins The two residuals basins will have a combined capacity of approximately 3 MG and a depth of approximately 7 ft. Each of the basins has been sized to provide approximately 365 days of storage capacity. The lowest cost option is currently to put all solids in the residuals basins and to take backwash high flows to one basin first, then to the other basin at lower decanted flow rates for polishing. Once a basin is full of solids, contract solids removal will occur. In the long term, once the plant is expanded or if contract -cleaning bids are much higher than currently quoted, other disposal options can be revisited. Based on the residuals production projected above, and assuming a solids concentration of 2 to 5 percent, the estimated residuals basins cleaning frequencies are presented in Table 2. Page 6 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants Table 2. Estimated Residuals Basins Cleaning Frequency Average Daily Plant Flow (mgd) 3.0 At 5 percent Solids Residuals Volume Depth of Residuals per year Estimated Dredging Frequency 1.7 MG/year 5.5 ft Once every year At 2 percent Solids Residuals Volume Depth of Residuals per year Estimated Dredging Frequency 4.3 MG/year 15 ft Once every 4 months Note: Dredging requirements estimated based on reserving the top 1.5 ft to 2 ft of lagoon depth for decanting. 9. Number of separate discharge points: one discharge of 0.9 MGD (see location in Appendix F) Outfall Identification number(s) 001 10. Frequency of discharge: Continuous ® Intermittent 0 If intermittent: Days per week discharge occurs: Duration: 11. Plant design potable flowrate up to 6.0 mad (2.0 initial) MGD Backwash or reject flow 0.2 (avg), 0.9 (peak) MGD 12. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including latitude and longitude): The receiving stream is the Cape Fear River. A map showing the location of the outfall is included in Appendix F. Two alternatives have been evaluated for the alignment of the outfall pipe, as shown in Figures 1 and 2 in Appendix F. Both alternatives would discharge at the same location. A final determination on the pipe layout will be made following N.C. Division of Water Quality (DWQ)'s review of the Engineering Alternatives Analysis. 13. Please list all water treatment additives, including cleaning chemicals or disinfection treatments, that have the potential to be discharged. Ferric Sulfate (or Alum),Caustic Soda (or Lime Slurry), Corrosion Inhibitor (Orthophosphate) Chlorine (Sodium Hypochlorite), Aqueous Ammonia (future, when needed), Polymer, Oxidant Page 7 of 8 C-WTP 03/05 NPDES PERMIT APPLICATION - SHORT FORM C - WTP For discharges associated with water treatment plants 14. Is this facility located on Indian country? (check one) Yes ❑ No Eg 15. Additional Information: • Provide a schematic of flow through the facility, include flow volumes at all points in the treatment process, and point of addition of chemicals. • Solids Handling Plan 16. NEW Applicants Information needed in addition to items 1-15: • New applicants must contact a permit coordinator with the NCDENR Customer Service Center. Was the Customer Service Center contacted? ❑ Yes 0 No > Analyses of source water collected • Engineering Alternative Analysis • Discharges from Ion Exchange and Reverse Osmosis plants shall be evaluated using a water quality model. 17. Applicant Certification I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief such information is true, complete, and accurate. Michael G. Mack Pender County Utilities Director e of Person Signing Title gnature of Applicant Date North Carolina General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other document files or required to be maintained under Article 21 or regulations of the Environmental Management Commission implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device or method required to be operated or maintained under Article 21 or regulations of the Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18 U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than 5 years, or both, for a similar offense.) 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