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Home My WebLink AboutNC0043532_Wasteload Allocation_19880321NPDES DOCUWENT :MCANNINO COVER SHEET NPDES Permit: NC0043532 West Stanly / Oakboro WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) ' Document Date: March 21, 1988 This document is printed on reuse paper - ignore any content on the reirer,stie aide 1 G /7 NCB (please attach) Fa (1No /TArv,' S NPDES WASTE LOAD ALLOCATION PERMIT NO.: NCO() FACILITY NAME• Ttwn 01 Oak boro It wrP Facility Status: �EXIb'TNG PROPOSED (circle one) Permit Status:RENEW—AIM• MODIFICATION UNPERMfT ED NEW (circle one) Major Minor. Pipe No - Design Capacity (MGD): Domestic (% of Flow)- So Industrial (% of Flow). Comments. G . 5o RECEIVING STREAM: Class: Sub -Basin- 03 01 /3 Reference USGS Quad: County: 5 4-41Y Regional Office: As (circle woe) Requested By• ; /� Wa Wi WS Date. /PM Pl/n gels Modeler Date Rec. i z( l9`�96 +4E Drainage Area (mil) 1q 5 Avg. Streamflow (cfs):. 7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs) Toxicity Limits: IWC /°C % (circle one) Acute / hroni5) Instream Monitoring: Parameters Upstream Location Ow ��&9 � Location J. 121.47 � Ubw ' n5 o- �ockeet 4�,5U4rti76 aA9 I wlovl f� -v v cv r k�i, tN 1/) ✓ G Downstream -/ e6. u e l Effluent Characteristics Summer Winter BOD5 (mg/1) NH3 N (mg/1) D.O. (mg/1) () TSS (mg/I)V) F. Col. (/100m1) i ) pH (SU) ()- q dyflIUk& ( rr9 A) 0.00Z ';1f r3twpvt boy) 0.05 itliCl(t ! (nit9/1 0.05 Lead cnig,i) o.oa5 ,(iN',v?ir(I (fr 4 /1) 6. 6C3 Comments: ftonmYI(1 etuei YYtfkli l: (` pek k/7() ;Ivey o/so 6o //i c(1 Pitt h01 ;toe -10-x l e',4 ',Iu1 41.5 / /19 i'uPi�C cbiiau c oid 10 edit,t GSa6, 3330'88 PA= qb5-6 vw7' aA= °12v.0 `1QI �5 aq • d c-6) �4►ow= 5t.o c-� c-C-s LE.0::Last 0 ci, Nv octkioc NORTH RALEIGH HILTON AND6 UM - Reservations 1-800/HILTONS a3uaia;ag alit 11) s3Dspe43eie43 9Fo = r qc n 0 A l) FOR APPROPRIATE DISCHARGERS, LIST COMPLETE GUIDELINE LIMITATIONS BELOW ^ ~ Request Nu. �43�3 ---------------- -- WASTELOAD ALLOCATION APPROVAL FORM ------- "er�it N.'mber Ty�`e o� Waste Statu� Pecei`i'.� Stream 8tream Ll�ss Subtjasi`� County Reginnal Office Requostor Date n1 Request Cuad NC0043532 TOWN OF OAkUORO WWTP DOMESTIC EXJSTING BIG BEAR C�LEK , � 030713 STANLY Drainage Area MRO Avera�e F]ow TOM CHRIST S'�mmer 7Q10 12/2/87 uinter '/�10 G17NE 3002 ----------------------- RECOMMENDED EFFLUENM T L[ITS -----------------'----'- WastefIow 5-Duy BOD Dissolved Dxygen TSS Fecal Colifnrm pH Cadmium Chromium Nickel Lead -~ 0.5 30 6 30 1000 6-9 0.002 0.05 0.05 C.025 � �� RECEIVED JAN ~.~�- �� ~ �� MORESVILLE UPS tream (YIN): Y Locetion: ABOVE DISCHARGE POlNT Downstream <Y/N>: Y Location: 1.8 MILES DOWNS TREPill AT MOUTH OF LONG CRElZ-K ---------------------------------- COMMENTS ----------------------------'----- RECOMMEWDED LIMITS CONTINUED: CYANIDE = 0.005 MG/L RECOMMEND EFFLUENT MONITORING FOR: COPPER, ZINC. AND SILVER RECOMMEND INSTREAM MONITORING FOR: D.O', T[MpERATURE, FECA- COLIFORM, AH- CONDUCTIVITY D.O. LIMIT ADDED DUE TO USGS REVISIONS G[VING THE CREEK 7Q10=0CF6 NEW INSTREAM MONITORIN8 REQUIREMENTS WILL HELP IN DETEFMINING WHETH[R WATER QUALITY STANDARDS ARE BEING PROTECTED THE E�lSTING LlMITS. SEE TOXICITY TESTING REQUIREMENTS ATTACHED Recommended by Reviewed by: l*ec|Support Supervisor Regional Supervisor Permits & Engjneering - �LOA -40 -7 A-.-. Date Date Date • Facility Narnc hni'i or (&k/ ov Permit A0oo1-/3.3a CHRONIC TOXICITY TESTING REQUIREMENT (QRTRLY) The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in: 1.) The NorthCarolina Cerioda BioassayThe - *phnia•chronic effluent bioassay procedure .(North Carolina Chronic ProccdtueRevised February 1987) or subsequent versions. The effluent conoentra ' n at which there may be no observable inhibition of reproduction or significant mortality is `19 % (defined as treatmen t two to the North Carolina procedure permit The pt holder shall perform Quarterly monitoring using this procedure to establish compliance with the permit condition. The first test will be performed after thirty days from • issuance of this permit during the months of r t71//, 040M- . Effluent sampling for this testing shall be performed at the N D 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 TGP3B. Additionally, DEM Form AT-1 (original) is to be sent to the following address: Attention: Technical Services Branch North Carolina Division of Environmental Management P.O. Box 27687 Raleigh, N.C. 27611 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 !bust be measured and reported if chlorine is employed for disinfection of the waste stream. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Environmental Management indicate potential impacts to the receiving stream, this permit may be reopened and modifetho include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited do cument, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid test and will require immediate retesting(within.30 days of initial.monitorin event . Failure to u suitable test results will constitute a failureof permit condition. g ) s brrut - 7Q10 0 cfs • Pesimitod Flow 0: 5 MGD Recommended:. by: 1W 10 °7o sub=basia.- Receiving Stream 131 Bear e ee/S _ C� _... County Snip y .- Date Wita/i.g. **Chronic Toxicity Jail, Sec Part. , Condition DIVISION OF ENVIRONMENTAL MANAGEMENT June 9, 1988 MEMORANDUM To: Dale Overcash From: Carla Sanderson Through: Trevor Clements Subject: The Town of Oakboro NPDES NC0043532 Limits for Metals and Chronic Toxicity This memo is in response to the letter from Mr. Larry Pearce on behalf of Oakboro requesting removal of their NPDES limits for metals and chronic toxicity. Previous analyses for the Town of Oakboro were performed using a 1976 USGS 7Q10 flow estimate of 3.0 cfs. Current USGS information (Feb., 1988) provided Techni- cal. Support with a 7Q10 estimate of 0 cfs. When the USGS first estimated a 7Q10 flow in 1976 for this point on Big Bear Creek, there were very little data available and only two base flow measurements were used to calculate the flow estimates. Cur- rently they have a gaging station with a longer period of recorded data. We have double checked with Bob Meickle from the USGS on the validity of the new flow estimation. The new WLA request gave new information regarding the per- centage of industrial flow and the metals to be limited. EPA approved procedures were used to develop WLA for metals. Since standards exist for parameters in question, limits must apply. However, DEM will remove limits if monitoring data shows concen- trations to be consistently below detection limits. If after 12 months of monitoring data are collected, the facility can demon- strate no need for metal limitation, DEM will reconsider the lim- its Oakboro's chronic toxicity limit was based on the instream waste concentration (IWC), as per division procedures. The IWC for the chronic toxicity requirement is based on the new 7Q10 of 0 cfs. Therefore, a chronic test for toxicity at 99% effluent is appropriate and should remain. Please let me know if further clarification in this matter is needed. CC: Ken Eagleson Rex Gleason Central File BLACK & V E A T C H, INC. CONSULTING ENGINEERS veL "* Town of Oakboro NPDES No. NC0043532 NC Department of Natural Resources & Community Development Division of Environmental Management P.O. Box 27687 Raleigh, North Carolina 27611-7687 Attention: Mr. Paul Wilms, Director Gentlemen: TEL. 19191 672-3600 110 WEST WALKER AVENUE ASHEBORO: NORTH CAROLINA 27203 MAILING ADDRESS: P.O. BOX NO. 728 ASHEBORO, NORTH CAROLINA 27204-0728 B&V Project 02150.IMS B&V File B May 17, 1988 g2E2F MAY 23 1988 DIV. OF ENVIRONMENTAL MANAGEMENT Raleigh, NC 0n behalf of the Town of 0akboro, we are requesting modifications to the NPDES permit to be issued May 31, 1988. Our primary concern involves the limitations for metals and chronic toxicity. According to my discussions with your staff, the wasteload allocation was based on new information for the receiving stream indicating that the 7-day, 10-year (7Q10) low flow is now zero. Previous information indicated that the 7Q10 was three cubic feet per second. This flow was used last year to develop the discharge permit for Stanly Knitting Mill, the only permitted industry representing approximately 90 percent of the total wastewater. Because of this significant and unexpected change in the receiving stream flow estimate, the Town will need time to evaluate the impact on the industry's permit. It is our understanding that the staff proposed no changes from the previous permit in the BOD and nitrogen requirements because no detrimental impact had been observed in fhe past on the stream, and they wanted time to study the situation. We are requesting the same consideration for cadmium, chromium nickel, lead, and cyanide. The Town understands the need to eliminate toxicity in the receiving stream and has already done two effluent chronic bioassay analyses, both of which failed. We have identified two possible sources of the toxicity in the discharge from Stanly Knitting Mill (copper and alkyl phenol ethoxylates) and are proceeding with additional effort to determine if these are the sources and identify actions that will be required of the industry. BLACK & VEATCH NC Department of NRCD 2 B&V Project 02150.IMS Mr. Paul Wilms, Director May 17, 1988 We would like to suggest you consider the following: o Eliminate the NPDES permit limitations for cadmium, chromium, nickel, lead, and cyanide at least until the Town can take appropriate action to demonstrate the presence or absence of these parameters in the effluent and attempt to reduce, if necessary, the discharge of these parameters. o Although the Town has already begun the effort, you may want to request, through the State Pretreatment Program Coordinator or other official, that these parameters be monitored in the discharge from Stanly Knitting until it can be shown that the parameters are not present at levels that would cause the Town to violate stream standards. We assure you that the Town of Oakboro is making a sincere effort to preclude violations of stream standards. We also trust that you understand that these particular stream standards have changed significantly and unexpectedly, and that the Town needs time to address the situation. Please contact us if you have questions regarding this letter. Very truly yours, BLACK & VEATCH i%Y Larry Pearce cdl cc: Town of Oakboro Mr. George Everett, NRCD Raleigh i/ Mr. Rex Gleason, NRCD Mooresville DIVISION OF ENVIRONMENTAL MANAGEMENT / July 25, 1988 , ?/yf r? MEMORANDUM TO: Arthur Mouberry f� 6)," :., X FROM: D. Rex Gleason T O,/jt1 r j PREPARED BY: Richard Bridgeman SUBJECT: Draft Permit Modification Request Town of Oakboro Wastewater Treatment Plant NPDES Permit No. NC 0043532 Stanly County, North Carolina In reference to the May 17, 1988 Black and Veatch permit modification request on behalf of the Town of Oakboro, the following comments/recommendations are offered: Request - That discharge limitations for cadmium, chromium, nickel, lead, and cyanide be deleted. Comments - The most recent DEM-generated data is dated October, 1984 (grab samples); copper and zinc appear to be the only parameters of concern, although the detection level (for Cary Lab instrumentation) was in excess of present stream standards or action levels for silver, cadmium, nickel, and lead. Both effluent and influent total chromium concentrations were <50 ug/l. A cyanide sample was not taken. The effluent MBAS concentration was 4.8 mg/1, therefore, consideration for this parameter should be a part of any permit modification. Approximately 1000 feet downstream of Oakboro's discharge is an ambient monitoring station. A review of data indicates that copper levels are almost consistently above the stream action level; zinc levels are elevated, but rarely above the stream action level; and chromium levels are only rarely above the detection level. No other metal concentrations warrant concern. Doug Finan acknowledges that the Pretreatment Group's recommendations were based on errors in evaluating the treatment plant's headworks analysis. Refer to Doug for further explanation. Stanly Knitting, a textile facility representing approximately 90% of Oakboro's total flow historically has the Arthur Mouberry Page Two July 25, 1988 potential to discharge to the Permittee any of the nonconventional pollutants; therefore, this Office concurs with the monitoring requirements recommended by Tech Services. Conclusions - There is an insufficient data base; however, available information does not suggest the need for a monitoring requirement for cadmium, chromium, nickel, lead, and silver. There is no available data on cyanide and sulfides, and little (DEM/October, 1984) on phenol, which does suggest a need, considering the potential. The monitoring frequencies for the metals and cyanide appear to be excessive. Recommendations 1. That the monitoring frequencies for the metals and cyanide be reduced to once per month. 2. That, if the accumulating data base exhibits a consistent trend below detection levels, the Permit be reopened to reduce the monitoring frequency for those parameters to semiannually. 3. That MBAS be added to any Permit modification. Additional Comment/Recommendation - This Office has already questioned (Technical Support Unit) the 7Q10 for Fong Creek. It is questionable that a watershed area of 192.5 mi would have a 7Q10 of zero. Considering the ramifications that this statistical flow has had on the subject Permit, USGS should again be asked to verify the data. :Carla Sanderson 16B :se