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~• ~• <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 vas 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 />I:f 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 tail. <br />Very truly yours, <br />CTL/THOhiPSON, INC. <br />By '~ ~ iv <br />4m. C. Hoffra,~ n, Jr., P oject Engineer <br />Re vie~:i d by: / <br />1 ^'~. <br />• • p +. <br />Leo • TERM*.•l~ <br />Robert W. Thompson, P.E. a; e, ~ '• <br />s; ¢ y$ <br />~~qq ~ 0 1 W . <br />Y~ ~. <br />WCH:RIJT:ct ~. A ~: <br />S}~y A~~ <br />(3 copies sent) ~rATE OF ~ <br />