The URL can be used to link to this page

Home My WebLink AboutNC0049867_Speculative Limits for WWTP Expansion_20170907Town of Cleveland 302 East Main Street P.O. Box 429 Cleveland, NC 27013 (704)278-4777 September 7, 2017 Ms. Julie Grzyb, Supervisor NPDES Complex Permitting Unit 1617 Mail Service Center Raleigh, NC 27699-1617 RE: Speculative Limits for WWTP Expansion Town of Cleveland Wastewater Treatment Plant NPDES Permit No. NC0049867 Dear Ms. Grzyb: RE CEIVEDINCDEQIDWR SEP 2 2 2017 water a Section Perm�ttm9 The Town of Cleveland, North Carolina in Rowan County is assessing its wastewater treatment plant (1NWTP) as part of a process to prepare for the potential addition of new local industries and the consolidation of two elementary schools in the area. The WWTP plant operates under NPDES permit No. NC NC0049867. The existing permitted monthly average WWTP discharge is 0.27 MGD and the effluent limits are summarized below in Table 1. Please also see the attached Quadrangle maps showing the location of the WWTP site, Third Creek, and the general surrounding area. The purpose of this letter is to request speculative limits for an NPDES discharge of 0.40 MGD and 0.50 MGD. Table 1: Existing Cleveland WWTP Permitted Effluent Limits LIMITS MONITORING REQUIREMENTS EFFLUENTCHARACTERISFiCS Units Monthly Weekly Daily Measurement Sample Type Sample Average Average Maximum Frequency Location Flow MGD 027 Continuous Recording I or E BOD, 5 day, (Apel 1 to October 31) 2 mg/L 15 225 Weekly Composite I, E BOD, 5 day, 20°C (November ItoMarch 3l)2 mg/L 30 45 Weekly Composite 1,E NH3asN mg/L 6 18 (April1 toOctober 31) Weekly Composite E NH3 as N (November 1 to M arch 31) mg/L 12 35 Weekly Composite E Total Suspended Solide mg/L 30 1 45 Weekly Composite 1,E Dissolved Oxygen' Weekly Grab E, U, D Fecal Coliform count per 100 200 400 (geometricmean) mL Weekly Grab E, U, D Total Residual Chlorme" pg/L 28 ___Yperk Grab E Oct and Grease Grab E Total Nitrogen (NOZ+NO, +TKN) Composite E Total Phosphorus Composite Erem rature °C Grab U, D pHmperatureCGrab EGrab EConductivity ollutantxiaty6 Grab U.DEfflueChron t Effluent Pollutant Scan Composite E Footnote? IFootnote?I , 1.)1= influentE= effluent, U= upstream at least 100 feet upstream from the discharge point, D= downstream at NCSR 1003 Effluent Upstream and downstream samples shall be grab samples I nstrearn monitoring requirements are waived conditional upon membership in the YPDRBA SeeoonditionA (4) 2 ) The monthly average BOD and Total Suspended Solids concentrations shall not exceed 15%of the respective influent values (85% removal 3 )Thedaily average dissolved oxygen effluent concentrations shall not be less than 5 0 mg/L 4) The Division shall consider all effluent TRC values reported below 50 gg/L to be in compliance with the permit However, the Permittee shall cont roue 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 ) The pH shall not be less than 6 0 standard units nor greater than 9 0 standard units 6.) Chronic Toxi city (Cenodaphrna) P/ Fat 3 0% March, June, Septemberand December (see condition A (2 )) , 7.) The permittee shall perform three Effluent Pollutant Scans during the term of this permit [seeA (3)] 8.) No later than 270 days from the effective date of this permit, begin submitting discharge monitoring reports electronically using NC eDMRa lication DWR's stem See alCondition A 5 It is anticipated that the discharge point into Third Creek for the expanded WWTP will remain at or near the current permitted location. A United States Geological Survey (USGS) streamgage (Station Number 02120500) is located just upstream of the discharge point for the Cleveland WWTP at approximately 35.74875 N, 80.68375 W. Refer to the attached Quadrangle and Street maps for the streamgage's location relative to the Cleveland WWTP. Unfortunately, this streamgage was only active between April, 1940 and September, 1971, and is the only streamgage with data for Third Creek. There are three active streamgages on other streams near the site that have been active since 2012, however, the data from these gages may not be used exclusively to estimate low -flow data for the WWTP discharge point at Third Creek. Based on counsel from USGS scientists we are providing the published low flow characteristics from the discontinued streamgage on Third Creek. Low -flow characteristics for Third Creek are summarized in Table 2 Below. Table 2: Low -Flow Characteristics for Third Creek streamgage (Station Number 02120500) Low -Flow Characteristic Value Drainage Area 87 4 square miles Annual Summer 7Q10 Discharge 16 cfs = 0.18 cfs per 87 4 square miles Annual Winter 7Q10 Discharge 27 cfs = 0.31 cfs per 87.4 square miles Annual 30Q2 Discharge 33 cfs = 0 38 cfs per 874 square miles Average Annual Discharge 91 cfs = 1.04 cfs per 87.4 square miles Minimum Daily Discharge (9/18/1956) 10 cfs = 011 cfs per 874 square miles Maximum Daily Discharge (9/19/1945) 2,500 cfs = 28.6 cfs per 874 square miles Summer 7Q10. 7 -day, 10 -year low flow discharge 7Q2: 7 -day, 2 -year low flow discharge 30Q2• 30 -day, 2 -year low flow discharge Winter 7Q10• 7 -day, 10 -year low flow discharge Sources: (1) USGS Stream Stats, http //water usgss oy/osw/streamstats/north carolina html (2) USGS, "Low -flow characteristic in North Carolina", http //pubs usgs goy/wsp/2403/report pdf (3) USGS, "Low -flow characteristics and flow -duration statistics for selected USGS continuous -record streamgaging stations in North Carolina through 2012", http ubs us s ov sir 2015 5001 If you have any questions about this matter or if you require additional information, please contact Clark Maness of WithersRavenel at (919)535-5213. Sincerely, PO_127� Danny Gabriel Mayor Enclosure Cc: Michael R. Koser, PE, WithersRavenel Michael C. Wicker, PE, WithersRavenel I Clark Maness, EI, WithersRavenel ATTACHMENT Legend �• .: { Stream �.._.._: USGS Streamgage 02120500 " �f 1 Cleveland City Limit - L.._.._111 OWN� JOG 41 • $fit Wastewater Treatment Plant r"- r• �,.� �.._.. . � � � ". �' ��,� it Ib f•.� 1 1 " X ��..j (jr• �: 1 Cleveland, NCS �•••'�r'',~ �,!�'. �;� �. ,.'` Wastewater ,�lit ;• , r Treatment Plant •� �- r, ''/ i 00 WithersRavenel Engineers I Planners I Surveyors `` • �+ •� �,,,- /<''1`�� i,/ 115 MacKenanDr I Cary NC, 27511 �� ! • - ••• y/ •.• ��•• �_ t: 919.469.3340 _ ♦ •• • •,_..�,�• • • •. �.^ •i/ . • •• • : 'r„�, I license #: C-0832 •/r , www.withersravenel.com i, ' �. ` r •'� • l' Lt'001,000 2,000 � � /.,� _ , - • w • ,�!!-- : ` - v.�.. � _ •'t1� �` � ' Feet ' �,.' ,r^"'...."'`= • • • ` r t kl►tiYi 1 inch = 1,000 feet ,,, „ �l! `� t�• Jr .. _. ♦ • • Path: \\wrcoro-fileO1\K\16\16-0400\160407-Clevel and WWTP Review\GIS\Clevel and WWTP.mxd Printed Date 9/6/?n17 Legend i N � Stream USGS Streamgage 02120500 �.■_••_� Cleveland City Limit �i ■ wui ■ %r :a d 4 Wastewater Treatment Plant i� i • ! i `Foy : -•■.ti 1 ,•• i = ' %% r ! 1 Cleveland NC ' Wastewater �•�� Treatment Plant 40 WithersRavenel 4,0) \/Engineers I Planners I Surveyors xisrt - 115 MacKenan Dr I CaryNC, 27511 ■~, - t"=ip!r sr05 I & j15 ��„ y/ ,••�•, t: 919.469.3340 4 Cleveland license M C-0832 a - - r u �• www.withersravenel.com ,•• 0 500 1,000 2,000 Feet 1 inch = 1,000 feet ' Path: \\wrcoro-file0l\K\16\16-0400\160407-Clevel and WWTP Review\GIS\Cleveland WWTP.mxd Printed Date: 9/6/2017 Created By: GWS