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<br /> <br />EEC Project No. 1082030 <br />ASCI - Turnpike Reservoir <br />May 5, 2008 <br />Page 10 <br />Earth Engineering Consultants, Inc. <br />close proximity to boring B-1, identified as B-11. Packer test were performed in borings B-3, <br />B-7, B-9 and a supplemental boring B-11 at various intervals within the bedrock formation. <br />The packer test results including the depths at which the test wee performed, the maximum <br />gauge pressures, the flow rate, and the hydraulic conductivity are presented in the Appendix of <br />this report. The results from the in-situ coefficient of permeability/hydraulic conductivity <br />testing, based on the packer test results, indicates the underlying cohesive bedrock formation <br />generally has permeability characteristics which would be suitable for reuse as an earthen liner <br />material. As shown on the enclosed boring logs included in the Appendix of this report <br />intermittent cemented sandstone lenses were identified within the bedrock formation at <br />increased depths. Due to the variability of the underlying bedrock formation and the type of <br />construction planned for the site, it is our opinion, an earthen liner around the reservoir's <br />perimeter and ground modification procedures within isolated areas along the bottom of the <br />reservoir will be required. Additional backhoe test pits and either NQ or NX coring on the <br />underlying bedrock should be performed to further assess the liner requirements. <br />Laboratory Falling Head Permeability Tests <br />EEC also conducted four (4) falling head permeability tests on remolded overburden and <br />bedrock materials obtained from various test borings at depths ranging from 10 to 30 feet below <br />site grades as well as from composite overburden samples collected from stockpiles located <br />within the south portion of the Turnpike mine site. The samples were remolded at or near <br />optimum moisture content and compacted to at least 95 percent standard Proctor density <br />(ASTM D698). The laboratory test results are presented in the Appendix of this report. The <br />results from these tests indicated coefficients ofpermeability ranging between lx 10-' to 1 x 10 <br />cm/sec., which indicates relatively low permeability for the materials analyzed. These <br />measured values, in conjunction with the field packer tests indicate the bedrock materials have <br />permeability and/or seepage characteristics suitable for reuse in constructing the earthen liner <br />for the proposed Turnpike Reservoir. Variations and seepage characteristics within the bedrock <br />formation can exist across the site.