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INTRODDCTION <br />' Dorchester Coal Company operates an underground mine located in <br />' Fremont County, Colorado. Processing wastes which require <br />disposal are produced in conjunction with this mining operation. <br />' At the present time, these coal processing wastes or refuse are <br />being placed in an area southwest of the mine office, shown on <br />1 Figure 1. <br />Rocky Mountain Geotechnical was requested by Dorchester Coal <br />Company to review present waste disposal operations, conduct <br />J subsurface investigations of the existing refuse pile and perform <br />the necessary laboratory tests to prepare an optimized storage <br />plan for the non-impounding refuse disposal facility. This <br />1 report contains the results of that study. <br />PROJECT HISTORY <br />The present disposal operations are being conducted based on a <br />1 previous design prepared by Geo Testing Laboratories, Inc. (GTL) <br />J in their January 26, 1981, report, titled: "Verification of <br />Items Contained in Rules 2 and 4 in the R~9Sll~~lons Qf ~b~ <br />ColoS~~4 L'1~L~~~ L~ Reclam~~12II ~~LS~ SQL Coal L'~1L~1Li3 for the <br />Dorchester No. 1 Mine near Canon City" <br />The GTL report evaluated the following items: <br />o "Hydraulic capacities of the existing drainage and sedi- <br />mentation systems for the hydraulic precipitation events <br />outlined in the Rules". <br />1 <br />