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-3- <br />Cior~s based on the proposed construction and the subsurface <br />• conditicns encountered. Nydrolegic conditions which may impact <br />the construction are heyond the scope of this report. <br />PROPOSED COPISTRUCTIOtJ <br />Specific design information for the dewatering structure was <br />not available at the time of this study. We understand the <br />dewatering structure will be steel-frame about 65 feet high and <br />used to process coal which will be mined by the hydraulic <br />method. The lower floor oC the structure will be slab-on-grade <br />near elevation 5760 feet. Cut depth of about 5 to 15 feet with <br />respect to natural ground surface is proposed. The structure <br />will have some vibrational loading due to shaking in the coal <br />• processing. Column loads are expected to range to a maximum of <br />about 300 kips as provided i;y YJestar. Column bays in the struc- <br />ture will be on about 17 feet centers. <br />The thickener will consist of a steel tank about ;2 feet in <br />diameter and about 16 feet tall and located near the dewatering <br />structure as shown on Fig. 1. Grading in the thickener area will <br />be similar to the dewatering structure area with cut to a maximum <br />of about 20 feet below existing ground surface. <br />The grading plan for the site indicates extensive cutting and <br />filling will be needed to develop roadways, laydown, coal storage <br />and parking lot area;. A sedimentation pond will also be con- <br />structed near the bottom of the d>sturbed area. Maximum planned <br />cut depths will be about 35 feet and maximum fill depths will be <br />. about 25 feet tiritfr respect to existing ground surface. Graded <br />ChenRAssociatcs <br />