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Home My WebLink AboutNC0004308_STAFF REPORT_19891229NPDRS DOCUNENT SCANNING COVER :MEET NPDES Permit: NC0004308 ALCOA — Badin Works Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Staff Report Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: December 29, 1989 This docxxmerct to prijmted oxm reuse paper - igariow-e away content o m the reYerse sicle DIVISION OF ENVIRONMENTAL MANAGEMENT December 29, 1989 MEMORAND i4 TO: File Alcoa - Badin Lake FROM: Marcia Toler-McCullen 7�'— Carla SandersonC� SUBJECT: Alcoa Discharge Locations Points of discharge are as follows for the Aluminum Corporation of America (ALCOA). Point 001 Alcoa NC0004308 Badin Lake/Yadkin River Has been eliminated. See Staff report of 01/20/86. Point 002 Alcoa NC0004308 Badin Lake/Yadkin River Existing and is plotted on topo map. Point 003 Alcoa NC0004308 Little Mountain Creek Existing and is plotted on topo map. Point 004 Greater Badin W&S District/Badin west NCO046671 Little Mountain Creek Formerly indicated at Pipe 004 for Alcoa, NC0004308. Existing and plotted on topo map under the name for NC0046671. Point 005 Greater Badin WAS District/Badin East NCO046311 Little Mountain Creek Formerly indicated at Pipe 005 for Alcoa, NC0004308. Existing and plotted on topo map under the name for NC0046311. Point 006 Alcoa NCO004308 Yadkin River Existing and is plotted on topo map. Point 007 Alcoa NC0004308 Yadkin River Existing and is plotted on topo map. Point 008 Alcoa NC0004308 Yadkin River Existing and is plotted on topo map. Point 009 Alcoa NC0004308 Badin Lake/Yadkin River Existing and is plotted on topo map. There is a proposed WLA for Greater Badin WWTP / NCO074756 / Little Mountain Creek. A permit does exist for this facility which is for a new plant to replace the old inadequate systems. This point of discharge is plotted on topo map and is included on the subbasin facility listing also. It is indicated as a separate facility. There was also a permit issued for Aluminum Company of America / NC0004308 / Yadkin River. In the staff report it was stated by the region that they wished to have one centralized location for the point of dis- charge. This point of discharge will be plotted and labelled one central- ized location as requested by the regional office. However, the other 8 points of discharge will be plotted as well and included on the subbasin facility listing. MLT:mlt \ 9 NPDES Permit No. NC 0004308 C i' .,l e_j�%` f�. STAFF REPORT AND RkECOMENDATIONS Part I - INSPECTION OF EXISTING WASTEWATER TREATMENT PLANT SITE 1. a. Place visited: Aluminum Corporation of America (ALCOA) b. Mailing Address: Post Office Box 576 Badin, North Carolina 28009 Stanly County 2. Date of Investigation: 8/20/ Date of Report: 1/20/86 3. By: J. Thurman Horne, P. 4. a. Person contacted: Mr. onrad Carter, Mr. Gene Ellis b. Phone No.: 704/442-5631 5. Directions to site: The ALCOA plant is located in the Town of Badin at the intersection of NC Highway 740 and S. R. 1719. 6. a. The coordinates to the existing points of effluent discharge are: Outfall 002 003 004 005 006 007 008 009 Latitude 35024'35" 35024'10" 35024110" 35024'10" 35029105" 35025110" 35023'40" 35024', Longitude 80006'55" 80007'15" 80007'15" 80007'15" 80010'35" 80005'30" 80004'30" 80006'' b. USGS Quad No.: F18NE and P18NW (see attached map) 7. Size(land available for expansion and upgrading): Adequate land is available at each discharge site to construct new facilities, modifications or expansions, if necessary. 8. Topography: Rolling, slopes generally range from 5-30%. 9. Location of nearest dwelling: Outlets 002, 003, 004, 005 and 009 - .approximately 500 feet; outlets 006, 007 and 008 - none within 1000 feet. 10. Receiving Stream: Outlets 002, 006, 007, 008 and 009: Yadkin River Outlets 003, 004 and 005: An unnamed tributary to Little Mountain Creek a. Classification: Yadkin River -- All & B Unnamed tributary to Little Mountain Creek - C b. Minimum 7-Day, 10-Year discharge at site: 2 34 c. River Basin and Sub -Basin No.: 03-07-08 Part II - DESCRIPTION OF PROPOSED/EXISTING TREATMENT FACILITIES/1,,'- >� _j 1. Existing Facilities: Outlet 002: pH adjustment (H Sb.,, = Mischa ge• +1, consists of boiler blowdown and storm water.QA FLO ULU r'•4�L"� . STAFF REPORT AND RECOM`4E\DATIONS Page Two Outlet 003 - Treatment facilities consist of an aerated lagoon (diffused air), chemical addition (caustic soda, ferric chloride and sulfuric acid), an oil skimmer and instrumented flow measurement. Wastewater is generated from the washing of pot shells used for casting aluminum ingots and air compressor cooling water. Outlet 004 -- No treatment facilities. Discharge consists of air compressor blowdown, non -contact cooling water and storm water.. Outlet 005 - Discharge is from an oil/water separator which receives storm runoff. Outlets 006, 007 and 008 - Non -contact cooling water resulting from the production of electricity at hydroelectric facilities. Outlet 009 - Discharge is from an oil/water separator which receives storm runoff. 2. Proposed Modifications: Not applicable. Part III - EVALUATION AND RECOMMENDATIONS 1. Performance Evaluation: A review of the last twelve (12) monthly self -monitoring reports indicates that the facility has maintained consistent compliance with the effluent limitations in the existing Permit. i 2. 0 & M Evaluation: A11 facilities appeared to be properly operated and maintained. The lake bottom at the points of discharge for outlets 002 and'009 appearsto have localized accumulations of black sediment which appears to be fine particles of coke being washed by storm water from the coke handling area (Note: Coke is used as a fuel for the furnaces). 3. Recommendations and/or Special Conditions: It is recommended that the Permit be renewed as requested. Note No. 1 - Outlet 001 has been eliminated. Note No. 2 - The applicant has requested that the existing Permit monitoring requirement for upstream and downstream BOD5 be eliminated for outfall 003. The Mooresville Regional Office agrees that the existing requirement is an unnacessary burden and, therefore, recommends that the renewed Permit require effluent BOD5 monitorin r - �� I Note No. 3 The applicant has requested that monitorin�requi.reT4f!ntso for temperature be deleted for outfall 003,rrvher, �r `e Company has demonstrated (through several 1.earsFof mortAr-gor •. data) that stream temperature is not adversely-a'.fepbu! by this discharge, the Mooresville Region�aJ OHi4 t't A fir,` recommends that the require;-.ent for tempo pture'.rnomu-p i be deleted.' \f% rtix. 5 STAFF REPORT AND RECO101ENDATIONS Page Three Note No. 4 - The applicant is presently adding H2SO4 to the discharge from outlet 002. This discharge consists of boiler blow - down and storm water. Without the addition of H2SO4, the pH of the discharge is approximately 10-11 s.u. which is in excess of customary effluent limitations for such discharges. However, considering that there is considerable dilution in the receiving waters, it is unlikely that this discharge would contravene any water quality standards. It is recommended that Technical Services evaluate the probable impact and if they concur that a water quality violation is not likely to occur, the renewed Permit should delete the pH limitations for this discharge. pH monitoring requirements should be maintained. Note No. 5 - A review of the applicant's effluent monitoring data for outlet 009 (Page II-7 of application) indicates there are significant concentrations of Fluoride and Cyanide which are well above water quality standards. It is recommended that Technical Services evaluate these parameters and ascertain if the reported concentrations warrant the inclusion of effluent limitations for these parameters. In discussions with the Company, they have indicated that the source of these constituents has not been pinpointed. If it is determined that effluent limitations are necessary the Mooresville Regional Office will inform the Company that the source must be located and eliminated or adequate treatment facilities will need to be installed. Note No. 6 - Outlets 006 and 007 are actually located just inside the Montgomery County line.