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EEC Project No. 1022218 <br />June 11, 2003 <br />Page 2 <br />Earth.Engineering Consultants, Inc. <br />Based on our preliminary laboratory test results, it is our opinion the overburden soils and <br />bedrock could function effectively as pond liner materials. Consideration may be given to <br />using a blend of overburden, bedrock and/or aggregates for the pond lining. More <br />specifically, it is our opinion the overburden soils and/ or bedrock may be blended with <br />aggregate materials at a ratio of approximately 1 to 3, respectively. EEC personnel are <br />prepared to conduct standard Proctor and falling head permeability tests on any <br />combination. of these materials to further evaluate the effectiveness of these materials as <br />pond liners. <br />We recommend the liner be constructed as a zone of blended and compacted material <br />placed against the excavated walls of the gravel pit with a buttress of other materials <br />placed against the liner to protect it from erosion. The liner materials should be <br />compacted to at least 95% of the material's standard Proctor maximum dry density <br />(ASTM D-698) at a moisture content within the range of ~2% of the material's standard <br />Proctor optimum moisture. <br />We appreciate the opportunity to be of service to you on this project. If you have any <br />questions regarding this report, or if we can be of further service to you in any other way, <br />please do not hesitate to contact us. <br />Very truly yours, <br />Eartl; EngireexinQ Cnns-~l.ta.nts> Inc. <br />~~,p0 REG/S~ <br />v~~4/~ ~SCHOF~;• F~ <br />~P~Il2Ia~`~ •: <br />23702 ? <br />Reviewed by: <br />visa R. Schoenfeld, P.E. <br />Senior Project Engineer <br />cc: Mr. Mark Kempton -Anderson Consulting Engineers <br />Principal Engineer <br />