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1 <br />1 <br />HEPWORTH-PAWLAK GEOTECHNICAL, Inc. <br />10214 Souih Progress Ln. <br />Parker, CO 80134 <br /> <br />Fax 303 841-7556 <br />Phone 303 841-7119 <br /> <br /> September 3, 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 />' <br /> Dear Mr. Friedman: <br />' Enclosed are daily field report numbers 1 through 6 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. <br /> Results of the Modified Proctor and gradation testing are presented on Figures 1 <br />' and 2. Because of local variations in the fill beneath nuclear density test locations, both <br /> rock corrected and uncorrected maximum dry density and moisture content values have <br />' been used. Our field technician determines which values to use depending on visual <br /> observation of the soils beneath the nuclear gage to the probe depth. <br /> If you have any questions, please call. <br />' <br /> Sincerely, <br />' HEPWORTH-PAWL/nA~K, GEOTECHNICAL, Inc. <br />' ~JLwr~w, ~ . `til ~~ <br />Dennis L. Hanneman, P.E. <br /> <br />1 <br />1 <br /> <br /> <br />