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~ • EXHIBIT L <br />Egviroqrr~eqt, Iqc. <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />GRESIDENT ARVADA, COLORADO 80003 <br />303-423-7297 <br />September 15, 1993 <br />Mr. Albert R. Frei <br />Albert Frei and Sons, Inc. <br />11521 Brighton Road <br />Henderson, CO 80640 <br />Dear Albert; <br />RE: M&G Pit, M-B6-079 <br />Exhibit L - Reclamation Costs <br />Attached are the numbers I came up with for the estimated <br />reclamation costs for the Technical Revision to be submitted this <br />month. The data used to estimate the costs are based on the <br />current disturbance at the site, and the various activities needed <br />to reclaim the site. Since you have topsoil/growth medium <br />stockpiled along the edges of the excavated area I did not add a <br />cost to resoil the setbacks and above water slopes. My understand- <br />ing is that you will be using part of that material to shape the <br />slopes around the lake and in so doing you will already have spread <br />soil on and graded the area needing topsoil around the lake. The <br />exception is on the 10.00 acres ± that is plant site area, here you <br />would need to resoil the area after the gravel piles are removed. <br />Attached is a sketch of the bank slope cross-section showing <br />how I calculated the cubic yards per linear foot number used to <br />determine the amount of dirt work needed on the perimeter of the <br />excavation. I estimated the existing slopes were lh to lv and the <br />reconstructed slopes would be 3h to lv, so an additional 9.72 cy/lf <br />would be needed to complete the slopes according to the law. I <br />used acerages derived from the 1993 annual report, the existing <br />mining and reclamation plans. The plan calls for recoiling to a <br />depth average of 5 inches. <br />