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-48- <br />rock storage area. These facilities should be placed as high as <br />possible on the_site so that positive drainage away from these <br />features can be provided. <br />The natural clay soils at the site should be utilized for <br />construction of the earth berms and soil liners beneath the vats, the <br />leached rock storage pile and the acid storage facilities. Material <br />placed in the dikes and the soil liners should be a sandy clay with at <br />least 60% passing the U.S. No. 200 sieve. All fill should be <br />compacted to at least 95% modified Proctor density near optimum <br />moisture content. A representative of a soil engineer should observe <br />the placement of fill. Foundation treatment should consist of <br />stripping all loose material, topsoil, fill and other organic or <br />deleterious materials from beneath all embankments and buildings. <br />Excavation of the overburden soils and large boulders in the <br />colluvial soils at the site should be possible with heavy duty <br />conventional excavation equipment. Some light blasting may be <br />required where very large sandstone boulders are encountered. <br />SFF.PAGE FROM SUBSURFACE DISPOSAL AREA <br />In our opinion, seepage from the deep subsurface disposal in the <br />worked out mine drifts will be extremely low. The low moisture <br />- intent present in the leached rock material which will be stowed in <br />drifts will not move under the influence of gravity. Most of the <br />;`ty drainage will take place during the leaching process, and some <br />°- `-?nal gravity drainage, along with evaporation, will occur during <br />porary surface storage. The remaining moisture in the waste <br />