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Ms. Kate Pickford, Division of Minerals and Geology <br />January 14, 2002 <br />Page Two <br />AGGREGATE <br />INDUSTRIES <br />Evaluating pre- and post-slurry wall ground~Hater level changes using potentiometric <br />maps and hydrogeologic sections, as necessaJy. The potentiometric maps will also be <br />used to delineate to the degree possible the meal extent and downgradient boundary of <br />groundwater depression potentially caused by i.he slurry wall to the south and east, and to <br />define the groundwater surface and the mounding effect imposed by the slurry wall to the <br />north and west; <br />Performing a statistical analysis using nonpazametric tolerance limits to determine <br />whether the post-slurry wall groundwater levels at each monitoring well (with sufficient <br />data) aze statistically different from the pre-slurry wall groundwater levels. This analysis <br />will provide a quantitative measure of the apptlrent groundwater level changes in the azea <br />of concern. <br />Please advise us if you have any further questio s or require additional information for <br />processing our technical revision request. <br />Very truly yours, <br />/~ ~~ G%~, <br />L d/7/~'G(O <br />Connie Nickle Davis <br />Support Services Representative <br />Enclosure <br />cc: Rob Helmick, Larimer County <br />Paul Banks, Banks and Gesso LLC <br />Richard Henry, Scientech <br />Aggregate Industries, WCR, Inc. -Mike Refer, Narm Roche <br />Connie Nickle Davis, Support Services <br />P. O. Box 337231, Grceley, CO 8(633 <br />970-33(rb526 Fex: 970-378b855 <br />