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Egviroq-qeqt, Iqc. <br />LARRY E. O'BRIAN <br />FOUNDER <br />August 17, 2004 <br />Ms. Erica Crosby <br />Division of Minerals and Geology <br />1313 Sherman St., #215 <br />Denver, CO 80215 <br />Dear Erica; <br />7985 VANCE DRIVE, SUITE 205A <br />ARVADA, COLORADO 80003 <br />303-423-7297 <br />FAX 303-423-7599 <br />RECEIVED <br />au~ ~ s 200, <br />Division of Minerals and Gw~Ogy <br />RE: Platte Sand & Gravel LLC ~'~'1"a~ <br />S&K Mine, Permit # M-2000-158 / <br />Adequacy 3 / <br />This is to follow up our conversation regarding the monitor- <br />ing plan for the trees. <br />1. In regards to the water table drop that would trigger the <br />recharge plan. Instead of a 4 foot drop as proposed, the <br />trigger point is changed to a 2 foot drop per our discussion. <br />2. Instead of the shift to the proposed bi-yearly monitoring <br />once a baseline has been established, we now propose doing <br />quarterly checks in the areas around the slurry walls. <br />3. I have talked to John Ford of Leonard Rice and Associates <br />about any background water table elevations they have from <br />monitoring the irrigation well on the site. He searching <br />their files for any information. I will y^et the information <br />to you as soon as I have it. <br />I hope these responses have addressed the adequacy questions <br />you had. If you have any questions please call me. <br />Sincerely, <br />Environment, inc <br />Stevan L. O'Brian <br />President <br />cc Platte Sand & Gravel LLC <br />faxed 8/17/04 <br />file <br />