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HomeMy WebLinkAboutNC0081957_correspondence_20060712 (2)ALCOA July 10, 2006 Alcoa Primary Metals Alcoa Power Generating Inc. 293 NC 740 Hwy PO Box 576 Badin, NC 28009-0576 USA Fax: 1 704 422 5776 N. C. Department of Environment and Natural Resources Division of Water Quality 1617 Mail Service Center Raleigh, N. C. 27699-1617 CERTIFIED MAIL RETURN RECEIPT REQUESTED Attention: Ms Susan Wilson 2011 9530 RE: STORMWATER DISCHARGE PERMITTING - ALCOA POWER GENERATING, INC FALLS POWERHOUSE — NC0076775 NARROWS POWERHOUSE — NC0081957 TUCKERTOWN POWERHOUSE — NC0081949 HIGH ROCK POWERHOUSE — NC0081931 Dear Ms. Wilson: Alcoa Power Generating, Inc has plans to install secondary containment for transformers which are part of the substations located at the Falls, Tuckertown, and High Rock Powerhouses. The Narrows Powerhouse does not have transformers on site and thus will not be installing any containment at this location. The installation of secondary containment will require the periodic removal of storm water which accumulates in the containment area and discharge through existing storm water conveyance systems. Historically, the storm water from these substations has been passively discharged through these same existing storm water conveyance systems. It is Alcoa's understanding that hydroelectric facilities have historically been exempt from federal storm water permitting requirements due to their SIC codes. While these facilities are exempt from the federal storm water permitting requirements, Alcoa Power Generating, Inc would like to request that the NPDES permits for these locations be amended to include language which would permit the discharge of storm water from these operations. If you should have any questions or comments, please don't hesitate to contact me @ 704-422-5774 or Larry McCaskill @ 704-422-5639. Yours Very Truly, Mark J. ss Vice Pres dent of Operations Alcoa Power Generating, Inc cc: email Z. T. Gibson W. L. McCaskill B. S. Dahlberg J. D. Morton - NAEHS R. Dworek — PGH Legal JUL 1 2 2006 � J DENR - WATER QUALM( POINT SOURCE BRANCH