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~~_ .~: <br />TerraMatrix <br />Engineering 8~ Envirorxnental Services <br />165 S. Union Boulevard • Suite 400 <br />Lakewood, Colorado 80228 <br />303-763-5140 •Tax 303.763-8003 <br />RF~EIVFD <br />April 21, 1995 <br />APR 2 4 1995 <br />iii iiiiiiiiniu iii <br />999 <br /> <br />Mr. Wally Erickson <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 Diuieian u. ,.undia'a ~ ve9iopY <br />Denver, CO 80203 <br />Re: Kerr Coal Company - Marr Mine (Permit No. C-80-006) MR-20 <br />Dear Wally: <br />Accompanying this le[ter is Kerr Coal Company's (Kerr) application and supporting materials <br />requesting approval of a minor revision (MR-20). The minor revision involves the modification <br />of the contour furrow's outline in the existing permit application. Included with this transmittal <br />are three copies of the following: <br />MR-20 Application Form <br />Summary of Revisions and Additions <br />Revised Permit Text <br />The existing reclamation plan states that for slopes greater than 4H:1V the contour furrows will <br />be established a[ gradients ranging from 0.1 to 0.5 percent and will route minor surface flow to <br />designed permanent drainage ways. In an effort to retain runoff on the slopes to promote <br />revegetation efforts, Kerr proposed to change the contour furrows to closed features established <br />at flat or minimal grades. In addition, [his will reduce runoff to the existing permanent drainage <br />ways, encouraging rapid vegetation establishment thereby strengthening the design feature of the <br />erosion control matting (Enkamat). <br />Please feel free to contact me with any questions or if I can provide further clarification or <br />submit additional information that will facilitate your review. <br />Sincerely, <br />TerraMatrix Inc. <br />.~~- ~ ~ <br />Thomas E. Leidich <br />Project Engineer <br />cc: George Patterson <br />Steamboat Springs, CO • Denver, CO • Seattle, WA • Juneau, AK • Santiago, Chite SA <br />