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eSCI C~ M <br />STATE <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 8663567 <br />FAX: (303) 832-8106 <br />V~ <br />V <br />DATE: May 4, 2006 <br />OF COLORADO <br />COLORADO <br />DIVISION OF <br />MIN SRALS <br />GEOLOGY <br />0.ECLANATION•NINING <br />EAFETT•ECIEN CE <br />rem Owens <br />Governor <br />TO: Erica Crosby, Carl Mount RGEEeu George <br />Executive Director <br />FROM: Tom Schreiner RGrula w. catrany <br />Division Director <br />Naturzl Resource Trustee <br />RE: Hydrology Review, "Wallenberg West Sand & Gravel Mine'; Asphalt Paving Company <br />File M-2005-066, Class: Permit <br />U~ <br />Per your request, I have reviewed the May 2, 2006 2"d adequacy response from Banks & Gesso, <br />LLC pertaining to the Wallenberg West Sand & Gravel Mine 112 Application. All hydrologic <br />concerns have been resolved to the Division's satisfaction based on the information and <br />commitments provided. Please note that on page 3 of the response letter, Asphalt Paving <br />Company has committed to submittal of a Technical Revision prior to any offsite discharge <br />(from pit dewatering activities) that will contain the details of the discharge structure(s) to be <br />used and associated erosion control methods that will be employed. Erosion control methods <br />will be deemed necessary by the Division if there is potential for excessive erosion of the <br />surrounding area based on the proposed discharge method(s). <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />