DSHW-2008-002400 - 0901a0688013ee1e

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Launch Systems Group
P.O. Box 707
Brigham City, UT 84302
www.atl<.com
8 January 2008
8200-FY08-053
Mr. Dennis R. Downs, Executive Secretary
State ofUtah
Department of Environmental Quality
Division of Solid and Hazardous Waste
288 N.1460 W.
P.O. Box 144880
Salt Lake City, Utah 84114-4880
JAN 0 8 2008
UTAHDIVISIONOF
SOLID & HAZARDOUS WASTE
Subject: ATK Launch Systems Promontory Facility, Groundwater Flow and Contaminant Transport
Models Report, EPA ID #UTD009081357
Dear Mr. Downs
As requested in a September 19, 2007 letter from your office, ATK Launch Systems has revised the
Promontory groundwater flow and contaminant transport model. Specifically, this new revision
incorporates the perched aquifer found along the eastem boarder ofthe facility as well as other
comments from the Division of Solid and Hazardous Waste. Attached, please find a copy ofthe
modeling report and an electronic copy ofthe model.
Ifyou have quesfions regarding this report, please contact Paul Hancock at [phone].
Sincerely,
W -/^
David P. Gosen, P.E., Director
Environmental Services