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• surface. The right abutment keyway excavation probably will be in <br />claystone; the left abutment keyway probably will be in clay and <br />possibly in sandstone or weathered sandstone. <br />c) Water levels encountered in test drilling indicated no <br />unusual conditions, but may suggest perched water tables. <br />2.2.4 Conclusions Reaardinq Topsoil Stockpile Areas <br />a) Topsoil stockpile areas generally are well located with <br />respect to the geology and topography. <br />b) It may be necessary on steeper slopes to. key in the <br />stockpiled material to offset any tendency to slump. The use of <br />crushed rock blankets (french drains) also may be desirable to <br />remove water from the contact between stockpiled material and the <br />underlying surface. <br /> <br />9 <br /> <br />