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FJ'u~~~~ ~0 ~® <br />blue <br />~ '-~" coal ~ <br />company <br />JAN 151986 <br />r: ~ L~fl LA~1J R~CLAMATli~y <br />Gc~lo. Dept. of P~at;!sa? Fe~~ urccz, <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade,colorado 81526 <br />(303) 464-7951 <br />BLUE RIBBON MINE BENCH STABILIZATION QUARTERLY CERTIFICATION <br />In accordance with Colorado Mined land Reclamation's Rule #4.09.1, this certification <br />was prepared to cover the fourth quarter of the mine bench stabilization project at <br />Blue Ribbon Coal Company. There was no activity in August therefore the fourth <br />quarter covers September through November 1985. I, Larry M. Reschke, P.E., <br />continued to be project engineer for this quarter. Jim Stover, P.E., of Powderhorn <br />Coal Company continued to assist in the inspection of the dirt work associated <br />with the project and Henry A. Barbe, Environmental Specialist for Powderhorn <br />Coal Company assisted in the revegetation work. <br />The work this quarter primarily consisted of placing the 4' of cover on the out- <br />• slope of the bench. Other work accomplished included: placing additional rock <br />around the toe, installing the remaining four stability monuments and a piezo- <br />meter, and seeding and mulching the outslope of the bench. <br />The project started up again on September 17, 1985. The plan called for placing <br />the cover contemporaneous with the waste placement. This was done to an ele- <br />vation of 6360-6370' but was discontinued due to the wet winter of 1984-85. An <br />excavator and two trucks were used to load and haul the colluvium stockpiled <br />at the toe of the bench and in the edge of .the #1 pond. A T D-20 dozer was <br />used to spread and compact this material after being dumped at the crest of the <br />top and middle benches. Additional drying time was generally required between <br />hauling and spreading this material. Topsoil was spread the last couple days <br />of the cover project. The areas covered with 4" or more topsoil were the south <br />third of the upper bench and the north third of the lower bench. This arrange- <br />ment for topsoil placement was partially due to the tight supply of borrow material <br />near the end of the project. The attached compaction tests, #188-205, were taken <br />in the 20, 000 cy of cover material placed. (Along with the field data lab moistures <br />. were run on five tests to make moisture corrections.) All of the test results <br />indicated adequate compaction once the moisture corrections were made. Weather <br />