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Home My WebLink AboutNC0032131_Fact Sheet_20210601DENR/DWQ EXPEDITED FACT SHEET - NPDES PERMIT DEVELOPMENT NPDES Permit: NCO032131 2021 Renewal This form must be completed by Permit Writers for all expedited permits which do not require full Fact Sheets. Expedited permits are generally simple 100% domestics (e.g., schools, mobile home parks, etc.) that can be administratively renewed with minor changes, but can include facilities with more complex issues (Special Conditions, 303(d) listed water, toxicity testing, instream monitoring, compliance concerns). Facility and Stream Information Applicant/ Facility Name: Tweetisie Railroad, Inc. / Tweetsie Railroad WWTP Applicant Address: 300 Tweetsie Railroad Lane; Blowing Rock, NC 28605 Facility Address: 300 Tweetsie Railroad Lane; Blowing Rock, NC Facility Class Permit Status: Grade 11 Biological WPCS Renewal Permitted Flow (as built) 0.175 MGD 0.07MGD Type of Waste 100% Domestic Receiving Stream Middle Fork of S. Fork New River Stream Class / ID WS-1V; Tr + / 10-1-2- 6 River Basin New River Subbasin 05-07-01 HUC 050500010201 USGSToo Boone C12NW 7Q10 Sum Win cfs 3.5 5.5 30Q2 cfs 8.7 Avg. Stream Flow (cfs) 19 IWC (%) Permitted/suet 7.19 / 3.01 County Watauga Regional Office WSRO Basic Information for Expedited Permit Renewal Permit Writer / Date Bradley Bennett / March 31, 2021 Does permit need daily max NH3 limits? Yes - Due to discharge location above ORW Does permit need TRC limits lan ua e7 Yes - Set based on Tr classification Does permit have toxicity testing? No Does permit have Special Conditions? No Does permit have instream monitoring? No Stream on 303 d List? For w/parameter? None other than statewide mercury listing Any compliance concerns? Number of Notices and Enforcements; see below Any modifications since lastpermit? None noted in application. New expiration date: January 31, 2026 FACILITY OVERVIEW: This facility is 100% domestic waste. Facility serves a theme park and has restrooms, food services, etc. for an average of 1,550 visitors and employees a day. The facility is permitted at up to 0.175 MGD and is currently built at 0.07 MGD. The treatment system consists of two 0.035 MGD treatment systems in parallel and includes the following wastewater treatment components: • Bar screen • Diversion box • Dual train aeration basins • Dual equalization tanks • Dual two -chamber clarifiers • Chlorine contact chamber • Tertiary filter unit with mudwell chamber • Dechlorination • Flow meter • Re -aeration • Emergency generator APPLICATION No modifications were noted or proposed in the current application. INSPECTION The most recent inspection (7/2/2019) noted a few issues that did lead to a NOV. Issues included sampler set up for time weighted composite sampling instead of flow weighted; no chart recorder or other device for continuous flow recording and the effluent pipe needed to be maintained for access. COMPLIANCE: During the permit cycle this facility had one (1) NOD and eleven (11) NOVs. The notices were mainly for violations of limits for BOD, TSS and a few for NH3-N. There were also eight (8) enforcement actions over the permit cycle, again mainly BOD, TSS and a few NH3-N violations. The total amount paid in these enforcements was $5,519.90 with $4,675 in penalties. MONITORING DATA REVIEW: Parameter Units Min Max Avg Permit Limit Comments Flow (MGD) 0 0.17 0.002 0.07 MA 5 MA BOD (mg/L) Summer 1 24.1 3.63 8 MA > 5; 17 DM > 7.5 N=124 7.5 DM BOD (mg/L) Winter 1 19.2 3.27 10 MA 2 MA > 10; 1 DM > 15 N=78 15 DM TSS (mg/L) 1.25 27 4.50 10MA 5 of 49 MA > 10; 10 DM > 15 15DM Temp (C) 0 35 13.01 - NH3-N (mg/L) Summer 0.1 9.5 1.61 2 MA 9 of 29 MA > 2; No DM exceedances 10 DM NH3-N (mg/L) Winter 0.1 4..08 0.8 DM No exceedances 20 DO (mg/L) 5.67 16.08 9.51 DA >_ 5 Above Tr limit of 5 Fecal Coliform (#/ml) 0.5 290 6.76 200 MA No exceedances 400 DM TRC (µg/L) 5 50 15.31 17 DM One frequency violation Total Nitrogen (mg/L) 1.9 35.8 13.19 - Total Phosphorus (mg/L) 0.08 7.3 2.37 - pH (su) 6.1 8.3 N/A >_6 and <_9 All values within range MA - Monthly Average DM - Daily Max DA - Daily Average Summer - April through Oct Winter - Nov through March The data reviewed for the renewal is from September 2016 through February 2021. LIMITS FOR BOD, TSS, NH3-N AND DO The Tweetsie Railroad discharge in Middle Creek of the South Fork New River is upstream of the ORW area for the South Fork New River. 15A NCAC 213.0225 establishes the criteria for ORW areas. It includes requiring more stringent permit conditions in ORW areas and areas upstream of designated ORW areas for protection of the resource. This lead to the inclusion in previous expansions under this permit of the more stringent limits fo BOD, NH3-N and TSS. In addition, the receiving stream for this discharge is classified as a Trout water which has led to the implementation of the DO limitation for protection of this resource. Tweetsie Railroad WWTP Fact Sheet NPDES Renewal 2021 - March 31, 2021 Page 2 FILE HISTORY REVIEW SUMMARY • 1981 Waste Load Allocation (WLA) - was developed for a discharge of 0.0024 MGD and set limits of: BOD and TSS - 30 mg/L; pH- 6-9; Fecal - 1,000 #/100ml; Residual Chlorine < 4.33 mg/L to protect Tr standard of 2µg/L. • 1982 WLA developed for 0.03MGD and changed the chlorine number to 0.35 mg/L • April 29, 1983 Authorization to Construct (AtoC) for the addition of a chlorination system. • 1987 WLA - developed for 0.024 MGD with chlorine level of 1.9 mg/L • 1989 WLA - developed for an expanded discharge of 0.07 MGD. On expansion residual chlorine level set at 67 µg/L. • August 31, 1990 AtoC for the installation of a 0.035 MGD treatment system. • 1992 WLA - NH3-N limit added at 26 mg/L; Fecal number dropped to 200. This document discussed the issue of the discharge being upstream of an ORW water and the impacts that would have on any future expansion. • 1995 Permit Renewal - Permit issued with tiered flows of 0.035 to 0.070 MGD. The permit letter addressed the issue of expansion given the discharge is above an ORW designated water body. By rule any expansion above the current 0.035 MGD would require lower discharge limits. The 0.035 discharge required BOD - 30/45; TSS - 30/45; Fecal - 200/400; TRC - 17 and pH -6-9 with monitoring for NH3-N, Temperature, Total Nitrogen, Total Phosphorous and DO. Expansion to 0.07 included lower limits of BOD 5/7.5; TSS - 10/15; set limits for NH3-N - 2 and DO > 5 and maintained the other limits/monitoring requirements. • September 8, 1997 AtoC for the expansion of discharge by adding another 0.035 MGD treatment system for a total flow of 0.07MGD. Engineers Certification for this construction received on May 22, 1998. • 2001 Permit Renewal - This permit was issued with 0.070 MGD flow modified the BOD and NH3-N limits to include different summer and winter numbers. Summer BOD set at 5/7.5 and winter 10/15mg/L. NH3-N monthly average limits were set at summer - 2 and winter - 4 mg/L. Other limits and monitoring were unchanged. • 2006 Permit Renewal - This renewal added daily max limits for NH3-N of summer - 10 and winter - 20mg/L. • 2008 Permit Modification - This modification was requested by the permittee to add an expansion tier up to 0.175 MGD. The ultimate expansion would be achieved by adding 3 additional 0.035 MGD treatment units to the existing two units of the same size. The expansion also proposed potential reuse of a small portion of flow throw irrigation and toilet flushing. A Level B model was run and the limits for the expansion we set the same as for the existing 0.07 MGD discharge. In this permit documentation the Winston-Salem Regional Office staff noted that an impoundment showing on the USGS quad sheet below the discharge had been removed. • 2011 Permit Renewal - There were no major changes to the permit. The applicant asked for review and possible amendments to their permit limits to provide flexibility. There is no indication in the file that this request was considered. • 2016 Permit Renewal - Applicant again requested review of their existing limits for flexibility. DWR staff responded in a May 2016 email noting the rule requirements for discharges above ORW segments that set the more stringent BOD, TSS and NH3-N limits. This permit included references to the eDMR requirements and regulator citations. Tweetsie Railroad WWTP Fact Sheet NPDES Renewal 2021 — March 31, 2021 Page 3 PROPOSED PERMIT CHANGES: • Updated eDMR requirements to be consistent with final EPA rule. • Added regulatory citations throughout permit as needed. • Correct reference to Waterville Lake, not Walters Lake PROPOSED SCHEDULE FOR PERMIT ISSUANCE: Draft Permit to Public Notice: April 5, 2021 Permit Scheduled Effective Date: July 1, 2021 STATE CONTACT: If you have questions concerning the above or the attached documents, please contact Bradley Bennett at (919) 707-3629. Tweetsie Railroad WWTP Fact Sheet NPDES Renewal 2021 — March 31, 2021 Page 4 STATE OF NORTH CAROLINA WATAUGA COUNTY PUBII(NOTI(B Notice of Intent to Issue a NPDES wastewater Permit NCO032131 Tweetsie Railroad The North Carolina Environ- mental Management Commis- sion proposes to issue a NPDES wastewater discharge permit to the person(s) listed DEQ -DIVISION OF WATER below. Written comments re- garding the proposed permit RESOURCES will be accepted until 30 days after the publish date of this no- 1617 Mail Service Cur tice. The Director of the NC Di- vision of Water Resources Raleigh, NC 276991617 (DWR) may hold a public hear- ing should there be a significant degree of public interest. Please mail comments and/or AFFIDAVIT OF PUBLICATION information requests to DWR at the above address. Interested persons may visit the DWR at Before the undersigned, a Notary Public of said County and State, duly commissioned, 512 N. Salisbury Street, Raleigh, NC 27604 to review in- qya ' s and authors by law to administer oaths, personally appeared formation on file. Additional in- formation on NPDES permits CAW/ e E who being first duly swom, deposes and says: that and this notice may be found on he (she) is an employee ofADAMS PUBLISHING GROUP, LLC, engaged in the publication our htto://dea.nc.gov/ab utldive- of a newspaper known as Watauga Democrat, published in the city of BOONE in said stons/water-resources/water-re- sources-permitshvastewater-br County and State, that he (she) is authorized to make this affidavit and sworn statement; that the anch/npdes-wastewater/public- notices,or by calling (919) 707- notice or other legal advertisement, a true copy of which is attached hereto, was published in 3601. Tweetsie Railroad, Inc. )00 Tweetsie Railroad Lane, Watauga Democrat on the following dates: towing Rock NC 28605) has requested renewal of NPDES NPDES Wastewater Permit NCO032131 Tweets 04/14/2021 Permit Number NCO032131 for the Tweetsie Railroad W WTP in Watauga County. This permitted facility discharges treated wastewater to the Middle Fork of the South Fork New River in the New River Basin. Currently, BOD, total suspended solids, ammonia, nitrogen, dissolved oxygen, fecal coliform, and total residual chlorine are water quality limited. This may affect future wasteload allocations in this portion of the New River Basin. , P.O. BOX 1815, BOONE, NC 28607 828-264-6397 This 14th day of April, 2021 M.rWA`,t ",' ignature of person making affidavit S4toanbscribed before me on this 14th day of April, 2021 2; y PU6� V ir.7�4.1 VUuI NOtaryPu Public GA C CC�J ��rt} 'orris, My Commission expires: ROY COOPER Governor DIONNE DELLI-GATTI Secretary S. DANIEL SMITH Director MEMORANDUM NORTH CAROLINA Environmental Quality April 5, 2021 To: Eric Hudson NC DEQ / DWR / Public Water Supply Winston-Salem Regional Office From: Bradley Bennett Compliance and Expedited Permitting Unit Subject: Review of Draft NPDES Permit NCO032131 Tweetsie Railroad WWTP Watauga County Please indicate below your agency's position or viewpoint on the draft permit and return this form by May 7, 2021. If you have any questions on the draft permit, please contact me via e-mail [bradley.bennett@ncdenr.gov] . RESPONSE: (Check one) Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated effluent limits are met prior to discharge, and the discharge does not contravene the designated water quality standards. ❑ Concurs with issuance of the above permit, provided the following conditions are met: 1-1 Opposes the issuance of the above permit, based on reasons stated below, or attached: Signed-C:0 Date: 3 o —Z, O Z. North Carolina Department of Environmental Quality i Division of Water Resources 40R�THCAROWUINA E 512 North Salisbury Street 1 1617 Mail Service Center 1 Raleigh, North Carolina 27699-1617 '�� Uapartmentof Envtromnantal Uualily 919,707.9000 6/1 /2021 Mail - Bennett, Bradley - Outlook NPDES Draft Permit Renewal - Tweetsie Raliroad WWTP NCO032131 Bryan, Jeff <jeff.bryan@ncdenr.gov> Fri 4/30/2021 1:43 PM To: Bennett, Bradley <bradley.bennett@ncdenr.gov> Cc: Hudson, Eric <eric.hudson@ncdenr.gov> 3 attachments (2 MB) NC0032131_Draft Permit and Cover Ltr_2021.pdf; NC0032131_Fact Sheet_2021.pdf; PWS Memo NC0032131.pdf; Hi Bradley, Please see the attached memo regarding the subject permit renewal. Thank you. Jeff Jeff H. Bryan, P.E. Assistant Regional Engineer Public Water Supply Section Department of Environmental Quality 336 776 9663 office 336 403 1092 mobile jeff.bryan@ncdenr.gov Winston Salem Regional Office 450 W. Hanes Mill Road, Suite 300 Winston Salem, NC 27105 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Hudson, Eric <eric.hudson@ncdenr.gov> Sent: Monday, April 5, 2021 10:37 AM To: Bryan, Jeff <jeff.bryan@ncdenr.gov> Subject: FW: Review of NPDES Draft Permit Renewal - Tweetsie Raliroad WWTP NPDES permit review Eric From: Bennett, Bradley <bradley. bennett@ncdenr.gov> Sent: Monday, April 5, 2021 9:54 AM To: Hudson, Eric <eric.hudson@ncdenr.gov> Subject: Review of NPDES Draft Permit Renewal - Tweetsie Raliroad WWTP Mr. Hudson, I am the permit writer assigned to the permit renewal for the NPDES discharge permit for Tweetsie Raliroad WWTP - NC0032131. This permit discharges to a WS-IV water body (Middle Fork South Fork New River) so I am forwarding the draft permit and fact sheet to you for your review and any comments https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 1 /2 6/1 /2021 Mail - Bennett, Bradley - Outlook you may have on the draft permit. This permit will be going to public notice later this week. If you could provide any comments back by May 7th, I'd appreciate it. If you have any questions, please let me know. I have attached a review form in pdf and word formats. Thanks for your help on this review. Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 2/2 6/1 /2021 Mail - Bennett, Bradley - Outlook RE: Tweetsie Railroad NPDES Permit Draft Ready for Notice - NCO032131 Graznak, Jenny <jenny.graznak@ncdenr.gov> Wed 4/7/2021 4:45 PM To: Bennett, Bradley <bradley.bennett@ncdenr.gov>; Snider, Lon <lon.snider@ncdenr.gov> No, I don't think we want to move forward with seasonal pump and hauls, Jenny Graznak Assistant Regional Supervisor Winston Salem Regional Office Division of Water Resources Department of Environmental Quality 450 West Hanes Mill Road, Suite 300 Winston Salem NC 27105 336-776-9695 office 336-403-7388 mobile jenny.graznak@ncdenr.gov Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Bennett, Bradley <bradley. bennett@ncdenr.gov> Sent: Tuesday, April 6, 2021 8:45 AM To: Boone, Ron <ron.boone@ncdenr.gov>; Graznak, Jenny <jenny.graznak@ncdenr.gov>; Snider, Lon <lon.snider@ncdenr.gov> Subject: Re: Tweetsie Railroad NPDES Permit Draft Ready for Notice - NCO032131 Hey Guys, Since P&H permits are issued through the regional offices I'll let you guys determine if this option is a workable one. If you think it is I can work with you to add language in the cover letter for the final permit mentioning this to them and directing them to the region if they want to pursue. Thanks Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 1 /3 6/1 /2021 Mail - Bennett, Bradley - Outlook From: Boone, Ron <ron.boone(@ncdenr.gov> Sent: Tuesday, April 6, 2021 8:06 AM To: Graznak, Jenny <jennygraznak@ncdenr.gov>; Snider, Lon <lon.snider@ncdenr.gov> Cc: Bennett, Bradley <bradley. ben nett@ncdenr.gov> Subject: RE: Tweetsie Railroad NPDES Permit Draft Ready for Notice - NCO032131 Do you know if it would be worth considering seasonal P&H permits for facilities with seasonal flows where it's difficult to meet standards year around when there's not enough food to sustain a viable population of bugs — like this one? Otherwise, I have no comments... Best Regards, Ronald C. Boone, Environmental Program Consultant NC Department of Environmental Quality, Division of Water Resources, Water Quality Regional Operations Section, Winston-Salem Regional Office 450 West Hanes Mill Road, Suite 300 Winston-Salem, NC 27105 Main: 336-776-9800 Direct: 336-776-9690 Mobile: 336-341-3568 Fax 336-776-9797 ron.boone@ncdenr.gov httpi/deq.nc.gov/about/divisions/water-resources From: Graznak, Jenny <jenny.graznak ncdenr.gov> Sent: Monday, April 5, 20219:56 AM To: Snider, Lon <Ion.snider(@ncdenr.gov>; Boone, Ron <ron.boone@ncdenr.gov> Subject: FW: Tweetsie Railroad NPDES Permit Draft Ready for Notice - NCO032131 Jenny Graznak Assistant Regional Supervisor Winston Salem Regional Office Division of Water Resources Department of Environmental Quality 450 West Hanes Mill Road, Suite 300 Winston Salem NC 27105 336-776-9695 office 336-403-7388 mobile jenny..graznak ncdenr.gov Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 2/3 6/1 /2021 Mail - Bennett, Bradley - Outlook From: Bennett, Bradley <bradley.bennett@ncdenr.gov> Sent: Sunday, April 4, 2021 9:05 PM To: Graznak, Jenny <jennygraznak ncdenr.gov> Subject: Tweetsie Railroad NPDES Permit Draft Ready for Notice - NCO032131 Hey Jenny, Attached is the draft permit and Fact Sheet for this permit renewal. We will be sending this one to public notice in the local paper later in the upcoming week. There aren't any major proposed changes in this one. Take a look and let me know if you have any comments or questions. The renewal application is available in Laserfiche. Thanks 11: Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 3/3 6/1 /2021 Mail - Bennett, Bradley - Outlook [External] RE: Draft NDES Permit for Tweetsie Railroad WWTP - NCO032131 Chris Robbins <chrisr@tweetsie.com> Wed 4/7/2021 12:42 PM To: Bennett, Bradley <bradley.bennett@ncdenr.gov> CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. Bradley: Document received, thank you. I can read it and print it with no problems. Chris Robbins Chris Robbins, President Tweetsie Railroad Inc. 300 Tweetsie Railroad Lane Blowing Rock NC 28605 828-264-9061 or 800-526-5740 ext. 110 chrisr@tweetsie.com From: Bennett, Bradley <bradley. ben nett@ncdenr.gov> Sent: Wednesday, April 7, 2021 10:46 AM To: Chris Robbins <chrisr tweetsie.com> Cc: rbarr@rpbsystems.com Subject: Draft NDES Permit for Tweetsie Railroad WWTP - NCO032131 Chris, Attached is the draft NPDES discharge permit for the Tweetsie Railroad WWTP - NC0032131. This permit will go to public notice in a local paper later this week. If you have any comments on the draft, please direct them to me through this email address. Please respond to this email to let me know that you received the draft permit and can read the file and download it for your records. Thanks Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO... 1 /1 4/5/2021 Mail - Bennett, Bradley - Outlook [External] RE: NPDES Renewal for Tweetsie Railroad WWTP - NCO032131 Chris Robbins <chrisr@tweetsie.com> Mon 4/S/2021 9:1 S AM To: Bennett, Bradley <bradley.bennett@ncdenr.gov> CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. Bradley Bennett: Yes, transmission of documents electronically is acceptable — and preferable. Send everything to this chrisr@tweetsie.com address. Thanks! Chris Robbins Chris Robbins, President Tweetsie Railroad Inc. 300Tweetsie Railroad Lane Blowing Rock INC 28605 828-264-9061 or 800-526-5740 ext. 110 chrisr@tweetsie.com From: Bennett, Bradley <bradley.bennett@ncdenr.gov> Sent: Sunday, April 4, 2021 8:56 PM To: chrisr@tweetsie.com Cc: rbarr@r bsystems.com Subject: NPDES Renewal for Tweetsie Railroad WWTP - NCO032131 Mr. Robbins, I am the staff person working on the renewal of your NPDES permit for wastewater discharge from the Tweetsie Railroad WWTR I have the draft permit ready for public notice later this week. I wanted to get in touch with you, so you have my contact email. Also, I wanted to make you aware that we are currently moving toward processing most of our correspondence in electronic format. Please review the information below about this. In order to provide more convenience, control, and security to our permittees and assist them in processing their transactions, The Division of Water Resources is currently transitioning towards electronic correspondence. This will hopefully provide more efficient service to our permittees and other partners and will allow us to more effectively process and track documents. We are writing to ask you for your approval of the transmittal of documents related to your permitting and related activities with the Division in an electronic format. Documents will be emailed to the appropriate contact person(s) in your organization in a PDF format. Please respond to me through email with verification that transmittal of your documents in an electronic manner is acceptable to you. If you have any questions, please feel free to contact me. Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/inbox/id/AAMkADgl YjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjf... 1 /2 6/1 /2021 Mail - Bennett, Bradley - Outlook RE: Draft Permit for Tweetsie Railroad - NCO032131 Kinney, Maureen <Maureen.Kinney@ncdenr.gov> Mon 4/5/2021 9:15 AM To: Bennett, Bradley <bradley.bennett@ncdenr.gov> This looks good Bradley, thanks! Have a good week! From: Bennett, Bradley <bradley. bennett@ncdenr.gov> Sent: Monday, April 5, 20218:50 AM To: Kinney, Maureen <Maureen.Kinney@ncdenr.gov> Subject: Draft Permit for Tweetsie Railroad - NCO032131 Hi Maureen, Here is another draft permit for your review. This one is for Tweetsie Raliroad WWTP - NC0032131. Thanks :: Bradley Bennett Compliance and Expedited Permitting Phone: (919) 707-3629 NC Division of Water Resources 1617 Mail Service Center Email: bradley.bennett@ncdenr.gov Raleigh, NC 27699-1617 Email correspondence to and from this address may be subject to public records laws https://outlook.office365.com/mail/id/AAMkADglYjdhZmlxLTMzMGYtNGU3Nil hNGU4LTY3M2E1 ODhmOGQxYgBGAAAAAACylgPJgHeWQptjfgCAO NH3/TRC WLA Calculations Facility: Tweetsie Railroad PermitNo. NC0032131 Prepared By: Bradley Bennett Enter Design Flow (MGD): 0.07 0.175 <= Permitted Flow if Different from Design Enter s7Q10 (cfs): 3.5 ** ORW Downstream so NH3-N set at 2 & 4 Enter w7Q10 (cfs): 5.5 Total Residual Chlorine (TRC) Ammonia (Summer) Daily Maximum Limit (ug/1) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted s7Q10 (CFS) 3.5 3.5 s7Q10 (CFS) 3.5 3.5 DESIGN FLOW (MGD) 0.07 0.175 DESIGN FLOW (MGD) 0.07 0.175 DESIGN FLOW (CFS) 0.1085 0.27125 DESIGN FLOW (CFS) 0.1085 0.27125 STREAM STD (UG/L) 17.0 17 STREAM STD (MG/L) 1.0 1.0 Upstream Bkgd (ug/1) 0 0 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 3.01 7.19 IWC (%) 3.01 7.19 Allowable Conc. (ug/1) 565 236 Allowable Conc. (mg/1) 26.2 11.1 Ammonia (Winter) Monthly Average Limit (mg NH3-N/1) Design Permitted Design Permitted Fecal Coliform w7Q10 (CFS) 5.5 5.5 Monthly Average Limit: 200/100mi 200n00mi DESIGN FLOW (MGD) 0.07 0.175 (If DF >331; Monitor) DESIGN FLOW (CFS) 0.1085 0.27125 (If DF<331; Limit) STREAM STD (MG/L) 1.8 1.8 Dilution Factor (DF) 33.26 13.90 Upstream Bkgd (mg/1) 0.22 0.22 IWC (%) 1.93 4.70 Allowable Conc. (mg/1) 81.9 33.8 Total Residual Chlorine 1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity Ammonia (as NH3-N) 1. If Allowable Conc > 35 mg/l, Monitor Only 2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals) 3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis) If the allowable ammonia concentration is > 35 mg/L, no limit shall be imposed Fecal Coliform 1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)