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<br />.: <br />a Sk~~j~~~~' ~~y/:WW <br /> <br />SEDIMENT POND EXPANSION CERTIFICATION <br />1 I .~IIU fTIUId <br />1:'v <br />no R111t <br />..131 BI~.-i;,G~ <br />'(PI' h' I. fi901 <br />This certification is an amendment to the certification done on the Grand Mesa <br />Coal Company's sediment pond August 30, 1983. Stipulation #1 of GMCC's <br />Mining Permit # C-034-81 required expansion of the pond. The design for this <br />expansion was approved October 1], 1984. Tlie work w<~s started in November <br />1984 but not completed until the spri~ig of 1985. The excavation was compleded <br />February 26 and the rip-rapping of the inlet end was completed March 9. The <br />disturbed slopes of the pond were re-seeded fit April . <br />During the expansion most of the accumulated sediment was removed and <br />additional sediment cap~icity was added. The sediment capacity was approved <br />at 0.9 a.f. but was increased to 1.22 a.f. The water volume was increased to <br />2.37 a. f. according to a survey done April 18, 1985, which i~ less than 1/2 of <br />1%under the design size of 2.38 a. f. <br />I certify that this excavation and volume surveys were done under my suprevision <br />and that the Pxpansion of the pond was done according to the plan approved by <br />Colorado Mined Land Reclamation October 11, 1984. <br />