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- 6 - <br />All of the old drilling indicates that the soils cover- <br />ing the area of the lower bench are clays of low plasticity <br />and sandy clays. <br />2.3 HYDROLOGY <br />No ground water has been encountered_in any borings lo- <br />cated within the bench area; this indicates that there is no <br />water table within approximately SO feet below the bench sur- <br />face. The character of the colluvial soils on the bench indi- <br />cates that no extensive perched water table is likely at the <br />site. <br />Local occurence of ground water cannot be excluded with- <br />in the more permeable parts of the bedrock formation (sand- <br />stones an coal). <br />There is no evidence of any major aquifer below the <br />lower bench; the steep slope between the bench surface and <br />the valley bottom appears to be dry. <br />3.0 INPUT DATA FOR PRELIMINARY DESIGN OF WASTE ROCK <br />PILE <br />3.1 FOUNDATION MATERIAL PROPERTIES <br />Considerable drilling and sampling of soils has been <br />undertaken on the lower bench where the initial waste rock <br />storage area is to be located (Chen and Associates, 1980, <br />IECO, 1976). The locations of relevant borings and the corres- <br />ponding boring logs are presented on Plate 2 and Plates B-1 <br />through B-10. This drilling has been performed during investi- <br />~~rawco~.w~mw,iNC. <br />