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Geotechnical Data Report Bruce Park Dam <br />Bowie Resources, Limited <br />April 2001 <br />materials are described as stiff to very stiff, moist, brown, yellow-brown, gray-green, <br />and dark gray in color. <br />The measured in-place dry densities of the New Embankment materials ranged from <br />97 pcf to 98 pcf. These in-place densities are 94 to 95 percent of the maximum <br />Proctor dry density. The measured in-place natural moisture contents ranged from <br />24.6 to 25.2 percent. The in-place moisture contents of the New Embankment <br />materials are 4.3 to 4.9 percent above the optimum Proctor moisture content. <br />7.2.2 Bedrock <br />Foundation bedrock below the Saddle Dam was encountered in Borings BS-102 and <br />BS-104. The bedrock generally consists of clayey siltstone, silty claystone and <br />claystone of the Mesa Verde Group. <br />The bedrock encountered in Boring BS-102, below the maximum section of the <br />Saddle Dam, consists of interbedded silty claystone and clayey siltstone to the total <br />. depth explored of 43 feet. The bedrock is described as weathered, yellow-brown silty <br />} claystone and clayey siltstone similar to the interbedded siltstone and silty claystone <br />described in BD-102. <br />The bedrock encountered in Boring BS-104, adjacent to the right abutment of the <br />Saddle Dam consists of claystone to the total depth drilled of approximately 6 feet. <br />The claystone is described as hard, green in color, moderately weathered with <br />manganese oxide staining, and very thinly bedded with nearly horizontal bedding <br />planes. <br />7.2.3 Groundwater <br />Groundwater was encountered below the Saddle Dam embankment in Boring BS-102 <br />at a depth of 28 feet, Elevation 8159. The groundwater depth was measured in an <br />open standpipe piezometer on November 29, 2000, one day after drilling. <br />Groundwater was not encountered in Boring BS-104, right abutment, to the total <br />depth explored of 6 feet. The reservoir was empty at the time the piezometers were <br />installed and measured. <br />7.3 Potentially Unsuitable Materials <br />Our review of the records from the SEO indicates that potentially unsuitable materials were <br />placed in the Saddle Dam during construction of the last embankment raise. Approximately <br />22 cubic yards of materials, consisting of stripped materials from the surface of a borrow <br />area, were placed as a temporary access bridge across the old spillway. The materials were <br />GEI Consultants, Inc. 19 99292 ^,1-0a-16 Geotechnical Data Report