NC0081931_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: [phone]
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
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