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1 <br /> <br />HEPWORTH-PAWLAIi GEOTECHNICAL, Inc. <br />October 5, 1998 <br />' ITEC Environmental Colorado Inc. <br /> c/o McCulley, Frick, and Gilman <br />' Attn: Jon Friedman <br />4900 Pearl East Circle, Suite 300w <br /> Boulder, CO 80303 <br />' Dear Mr. Friedman: <br />10214 South Progress Ln. <br />Parker, CO 80134 <br />Fax 303 841-7556 <br />Phone 303 841-7119 <br />Enclosed are daily field report numbers 7 through 12 for nuclear density testing <br />performed on the raise to the existing tailings embankment at the Cash Mine <br />Redevelopment. The criteria established for the fill are a minimum dry density <br />exceeding 90% of the maximum Modified Proctor (ASTM D1557) within 2 percent of <br /> optimum moisture content. Nuclear gage density testing indicates that the tested fill <br />' meets the compaction and moisture specifications. <br /> Results of additional Modified Proctor and gradation testing are presented on <br />' Figures 3 and 4. Three sand cone tests were performed on September 2S° as requested. <br /> The sand cone test results correlate well with the nuclear gage results, considering the <br />' relatively large maximum particle size of the fill. <br /> We appreciate the opportunity to have provided construction materials testing <br />' services for the Cash Mine Project and look forward to the possibility of working with <br /> McCulley, Frick, and Gilman on future projects. With four offices throughout Colorado <br />' in Parker, Glenwood Springs, Silverthorne, and Colorado Springs, we are capable of <br />meetin <br />our needs re <br />ardl <br />tion <br />s <br />f th <br />t l <br />j <br /> g y <br />g <br />. <br />es <br />o <br />e pro <br />ec <br />oca <br />' If you have any questions, please call. <br />' Sincere]y, <br />i , HEPWORTH-PAWLAK GEOTECHNICAL, Inc. <br />Dennis L. Hanneman, P.E. <br />1 <br />