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iii iiiiiiiiiiiii iii <br />Dan's Pond, Pond 12 <br />Certification of Construction <br />I Larry M. Reschke, PE, do hereby certify that the construction of Dan's Pond was <br />constructed in accordance with plans submitted to and approved by the Colorado <br />Division of Minerals and Geology as Technical Revision No. 22, Mine Water Treatment <br />Pond. Guidelines for construction of the pond were the Lincoln DeVore design included <br />in Appendix 13-5 of our permit application. I personally labored, surveyed and observed <br />construction during the entire project. <br />Construction began the third week of November 1997 with excavation of excess material <br />from the design azea. The east end of the pond was excavated to the subgrade and the <br />cutoff trench was dug. The exposed subgrade was ripped 18', rock over 8" was <br />removed, the ripped azea was watered to get approximately the optimum moisture and <br />the subgrade was wheel compacted and/or sheepsfoot roller compacted. Initial 6" lifts of <br />fill on the floor, banks and the cutoff trench were spread, watered, rock over 4" removed <br />by hand, and the fill was compacted. Subsequent fill material was screened prior to <br />spreading to remove the rock and to better mix the material. The cutoff trench, pond <br />dam and drainage pipe trench fill were constructed in multiple 6" lifts. The pond bottom <br />and banks were covered with three 4-6" lifts. Frequent compaction tests were taken to <br />assure design The dirt work on the pond was completed on December 3, 1997. <br />Results of the 117 compaction tests and survey data are available at the mine office. <br />pictures of key construction points aze also available. <br />/~,~[ <br />2-4~q~ <br />