1996-11-25_REVISION - M1981302 (4)

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� 6ouQe&I 11 0 RECEIVED 999 NOV 2 5 1996 HART ENVIRONMENTAL A Member of the Aggregate Environmental Resource Group, LLC>: Michael _0M t'erAnuna9ea .•s.,.�N`Y November 22, 1996 Mr. Gregg R. Squire Environmental Protection Specialist Division of Minerals and Geology Colorado Department of Natural Resources 1313 Sherman Street, Room 215 _ Denver, CO 80203 Re: Technical Revision, Permit M-81-302 (Deepe Farm Pit) Dear Gregg: I am writing to you on behalf of my clients, Western Mobile, Inc. (WMI), to request a technical revision to the above-mentioned permit, also known as the Deepe Farm Pit. Since 1989 the Deepe Farm sand and gravel site has been operated by WMI. The area has been a significant source of sand and gravel for the Boulder Valley over the past forty plus years. The first mining activities began in the early 1950s when sand and gravel were excavated in order to build the Denver-Boulder turnpike. Over the past forty years the Deepe Farm and adjoining land to the west have been mined on and off by a number of different Boulder companies. The current"Deepe Farm" project was begun in 1982 by Flatiron Sand and Gravel Company. In 1982 the Boulder County Commissioners gave authority to Flatiron to mine and process sand and gravel from 168 acres of Deepe farm. In 1989 Flatiron transferred the Deepe Farm mining operation to WMI while retaining ownership of the Deepe Farm acreage. During the past seven years, WMI has mined and reclaimed the site according to the terms and conditions of the special use review originally granted to Flatiron by the Boulder County Commissioners in 1982 and again reviewed in 1988-89. Presently, WMI intends to modify the finished contours and on-site drainage of the Deepe Farm Pit. The most significant feature of this revised Reclamation Plan is the reduction in the total number of acres of exposed water. The current Reclamation Plan calls for five lakes with a total of 38.1 acres of exposed water. The revised Reclamation Plan contains two lakes with a total of 4.2 acres of exposed water, which is a reduction of 33.9 acres of exposed water. The proposed revisions to the Deepe Farm Pit will reduce the amount of evaporative loss from the site and are part of an overall grading and drainage plan that covers the following areas of the site. 1 . At the north end of the Deepe Pit, a shallow drainage channel will be excavated and connected to a similar drainage channel on the Turnpike Pit. 215 s A1radouo Aurnue P o Box 1303 2. Along the east side of the Deepe Pit, the previously approved drainage channel will be Bmdder, «I solo. extended south and west, as indicated on the enclosed Reclamation Plan drawing. 6/Fex m 4146n0i Wellands Rankng Emi,ommlal Manaarmna Lnmi Use Pla mg Reclamaw,Design Permiging&Zoning