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~ t ~r ~. <br />Y* /~ <br />Fyk T <br />4; 11>:.. <br />H S ~ ` <br />dSif^ r <br />Lincoln DeVore,lnc <br />Geotechnical Consultants <br />1000 West Fillmore St. <br />Colorado Springs, CO 80907 <br />(3031632-3593 <br />Wyoming Fuel Company <br />P. O. Box 15596 <br />Lakewood, CO 80215 <br />Attn: Steve Magneson <br />December 16, 1988 <br />Re: Final Completion Report, Earthwork Observation and Testing <br />Mine Water Discharge, Pond 005, Golden Eagle Mine, <br />Las Animas County, Colorado <br />Dear Steve, <br />This report presents the results of our field observations and <br />density testing performed during the construction of the above <br />referenced pond between November 22 and December 1, 1988. The <br />work on that project primarily involved the construction of two <br />dikes (embankments), one on the east and one on the north; and <br />the placement of low permeable clay fill in the base of the pond <br />excavation. Lincoln DeVOre was informed by Wyoming Fuel Company <br />that the compaction specification was 90$ of a Standard Proctor, <br />with no moisture specification. <br />GRADING PROCEDURES <br />The existing organics and topsoil were removed from within the <br />fill areas. The fill material consisted of the native, clayey <br />soil identified in Lincoln DeVOre letter dated November 17, 1988, <br />Job No. 70123. The fill materials were placed in relatively thin <br />lifts, and compacted to a minimum of 908 of their maximum <br />Standard Proctor dry density (ASTM D-698). The placement and <br />compaction was observed by our field representative. <br />In-place density tests were taken according to ASTM D-2922. A <br />total of forty-one (41) density tests were taken on the material <br />placed in the embankments, pond lining, and over utility lines. <br />The results of our tests are shown on the attached forms. The <br />dry density determinations were calculated as a percent of the <br />Standard Proctor dry density (ASTM D-698) as the reference 100$ <br />density. The soil had a maximum Standard Proctor density of <br />105.2 pounds per cubic foot (pcf) at a moisture content of 18.5$. <br />As used in this report, the term "observation" implies that we <br />observed the progress of work we agreed to be involved with. Our <br />work involved the observation and field density testing of the <br />compacted fill. It is our opinion that sufficient tests were <br />