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~~ ~i <br />-2- <br />roughly bisects the fill area from elevation 7355 to 7455. The drain ex- <br />cavation was backfilled using sandstone, developed from excavations at <br />the Energy Fuels Corporation mine. Photographs of the drain material are <br />included in Appendix A. <br />After installation of the drain system, construction of the upper spoil <br />area began. The construction procedure consisted of dumping spoil at <br />desired fill locations and spreading the soil to thicknesses on the order <br />of 4 feet. Compaction was obtained by directing over-burden truck traffic <br />across the fill surface. <br />Our firm had a representative present during various construction phases <br />to observe construction and to perform field density testing. Our obser- <br />vations and results of field density testing indicate that the buttress <br />fill for the upper spoil area was constructed in general conformance with <br />our recommendations presented in our original report (Job No. 56646 and <br />subsequent letter, Job No. 6210, dated March 31, 1980). <br />Tf desired, we can provide specific data on field density testing per- <br />formed during construction. If we can be of further service in discussing <br />the contents of this letter, our observations during construction or in <br />discussing the construction of spoil area 2A, please call. <br />Very truly yours, <br />CTL/THOMPSON, INC. <br />Wm. C. Hoffmann,'J.r':, Projegt Engineer <br />Reviewed by: ;a~~ <br />tid~THG'Ji? `~, <br />f~u~Ai c_.YFq~n~O.:~ <br />~ =. <br />Robert W. Thompson P.E.1~,.Q~ °~":.~, <br />, rryyU o' G • <br />'i~Ts l~,a '+i> <br />WCH:RWT:ct '" <br />,~ . <br />(3 copies sent) ~\,r;~r~`"°,+;;~t°,,'~,~ <br />~~~;~£ tl;: ; <br />