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' - 11 - <br />in sealing of foundation soils in runoff ponds. However, seepage <br />' analysis should be performed for temporary impoundment as well as <br />permanent impoundment structures. Seepage analysis and embanlanent <br />drainage is discussed below. <br /> Free water was encountered at approximate depth B to 10 feet <br /> within runoff ponds #2 and #3 and as shallow as 2 1/2 feet in the <br /> vicinity of fresh water pond #2. Zf excavation extends below ground <br /> water level, high seepage and considerable dewatering problems should <br /> be anticipated. Due to the shallow water table and proposed excava- <br /> tion, we recomnerd additional exploratory holes be drilled within the <br />i l <br />t <br />d f <br />h <br />d <br />2 <br />i <br />d <br /> re <br />oca <br />res <br />e <br />water pon <br />and <br />n the <br />eepest excavation area of <br /># <br /> runoff pond #2. <br /> Stability Analysis: We have assumed in our evaluation that site soils <br />' will be utilized as borrav for embanlrnient construction. Considering <br /> the abundance of fine rained soils and Iack of suitable semi-pervious <br />' and pervious material, a modified homogeneous embanlanent appears most <br /> feasible. This type construction should be compatible with the <br /> proposed embanlanent configurations aryl use. However, for best utili- <br /> zation of on-site materials and embanlanent stability, some zoning may <br /> be desirable. This could involve placement of coarser soils on the <br />' downstream outer ernbanlarent face. <br /> Shear strength analysis was performed on several undisturbed and <br />' remolded sam <br />les t <br />ical of fou <br />rob <br />d <br />tio <br />d <br />bl <br />t <br />i <br />b <br />l <br /> p <br />yp <br />n <br />a <br />n an <br />p <br />a <br />orrow ma <br />er <br />e <br />a <br />. <br /> Results of triaxial and direct shear test results are presented on <br /> Figures 11 through 17. Direct shear test results presented by <br />' International Engineering Company, Inc. (December 1976) performed on <br /> undisturbed samples were also reviewed. Based on the available data, <br />1 <br /> <br />