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a <br />CTL/THOMPSON, INC. <br />CONSULTING GEOTECHNICAL AND MATERIALS ENGINEERS <br />October 6, 1982 <br />Getty Oil Company <br />Coal Oeparcment <br />P.O. Box 7900 <br />5250 South 300 West <br />Suite 200 <br />Salt Lake City, Utah 84107 <br />Att: Mr. Richard Wright <br />Subject: Temporary Spoil disposal Area <br />East of Colorado Yampa Coal Company Shops <br />Oakcreek, Colorado <br />Job No. 8254 <br />Gentlemen: <br />We understand that temporary stockpiling of spoil will be necessary in <br />conjunction with the development of the proposed Twenty Mile underground <br />mining operation. Entries for the mine are planned near the bottom of <br />portions of an abandoned 8050 pit south of the shops. As part of the work, <br />some spoil will be removed from the adjacent pit spoil bank and additional <br />material will be developed from construction of the entry highwall. The <br />quantity of material to be stored has not yet been determined. We have been <br />informed that it is your desire to store the spoil in an area about 1,000 <br />feet east of the existing shops and northeast of the abandoned open pit. <br />The purpose of this letter is to present our recommendations for the design <br />and construction of the storage facility. <br />The proposed storage area is located at the toe of a north-facing slope which <br />has been disturbed by surface mining. The specific site for storage tends <br />to slope dawn to the north and northwest at grades estimated to generally <br />be between 10 and 15 percent. It does not appear that there are any major <br />drainage paths which cross the site. The ground surface is relatively bare <br />with some native grasses and weeds. The general location and a topography <br />of the proposed storaye area are presented on Fig: 1. <br />The present plan is to construct the temporary disposal area in a manner that <br />will result in two relatively level pads. The pads will be used for storage <br />of equipment far the proposed underground mine, temporary coal storage and <br />some modular offices. It is generally believe that the fill will be 50 or <br />less feet thick on the downhill side. The fill will eventually feather out <br />. and match existing contours on the uphill side. We considered a maximum <br />50-foot thick fill for the purpose of evaluating stability of the disposal area. <br />1971 WEST 12T'H AVENUE DENVER. COLORADO 8020a (303)82-0777 <br />