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<br />The depth to bedrock is not known for the entire site but the soils in <br />colluvium do thin on the steeper slopes to the southwest. At Well B-16 <br />a bedrock sandstone unit about five feet thick was encountered at a <br />depth of 15 feet. Shales comprised the remaining unit below the <br />sandstone to a maximum depth of 56 feet. Water levels in the well <br />remained below a depth of 50 feet during the entire monitoring period. <br />Thus, it appears that the hydrology of the site is similar to the <br />conditions at the lower bench and initial wasterock pile where the <br />colluvium was found to be unsaturated and composed principally of <br />impermeable clays. No aquifers should be encountered during drilling <br />and no production wells are presently located near the site. <br />• It is possible that ephemeral seeps could occur along the steep slopes <br /> on the southwest of the site. Snowmelt runoff and storm runoff would <br />occur but on an infrequent basis. No perennial flow or springs occur on <br />this site. <br />Exploration Activities <br />WECC proposes to conduct shallow drilling operations in the area shown <br />on Attachment A to this application. The drilling is being conducted to <br />collect sail samples, determine colluvium thickness and to determine <br />water conditions in the colluvium, in order to characterize the <br />foundation and design details for a proposed coal refuse disposal site. <br />It is proposed that nine 42" diameter holes will be auger drilled to an <br />• -2- <br />