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-11- <br />• <br />The flat grades confined by the ridge and the near-surface, rela- <br />tively impermeable bedrock has caused a shallow perched ground <br />water table to develop over portions of the area to be used as <br />Disposal Area I. In our opinion, the nature of the fill will re- <br />suit in Area I being classed as lv~ ley Fill ccording to Section <br />816.72. ~- <br />Area II <br />Area II is located in Sections 13 and 18, T. 4N, R. 86W. The <br />ground surface in this area is substantially steeper than in Area I. <br />The disposal area includes a number of drainages. These drainages <br />carry water during the spring snowmelt period and following periods <br />• of precipitation. Some of the drainages are fairly deeply incised, <br />as indicated by the topography shown on Fig. 1. The ground surface <br />in the bottom of the proposed spoil area is relatively gentle <br />with grades less than 10 percent. However, both valley sides are I <br />~~~~ <br />sufficiently steep that the fill will be classed as a valley fill. <br />FOUNDATION CONDITIONS <br />Area I <br />Foundation conditions in Area I were evaluated by drilling 4 <br />exploratory borings (TH-1 through TH-4) as indicated on Fig. 16. <br />No borings were drilled on the ridge areas surrounding the Area I, <br />however, borings were drilled in ridge areas for Area II and in <br />Area III. The borings in the ridge areas indicate a very shallow <br />• layer of surficial clay which is quite stiff, underlain by moderately <br />