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09/17/2004 10:20 303-423-7599 ENVIRONMENT INC PAGE 02 <br />~r~viror~n?er~t, Inc. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />FOUNDER ARVADA.COLORAD080003 <br />P~ECEIVEC? 303-423.7297 <br />FAX 303-423.7599 <br />August 17, 2004 ~~~ ~ ~ ~(I(?~ ~ <br />Division o(Minerais & Geology <br />Ms. Erica Crosby <br />Division'•of Minerals and Geology <br />1313 Sherman St., X215 <br />Denver, CO 80215 <br />Dear Erica; <br />RE: Platte Sand G Gravel LLC <br />S&A Mine, Permit # M-2000-1.58 / <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 aster table drop that would trigger the <br />rebharge 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-yeazly 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 get 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 />ee Platte Sand & Gravel LLC <br />faxed 8/17/04 <br />file <br />