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1. To detne the stratigraphy and grain size of the overburden and alluvium overlying the <br />bedrock along the slurry wall alignment. <br />2. To more accurately define the top of bedrock elevation underlying the alluvium. <br />3. To determine lithological, geotechnical and hydrogeological characteristics of the bedrock <br />along the alignment. <br />This information will assist in developing comprehensive engineering criteria, utilizing the <br />geotechnical information gathered in this study to allow for the most efficien[ and effective <br />barrier wall construction. <br />1.04 References <br />In preparing this report, $aley & Aldrich has relied on the following information: <br />1. An aerial photograph of the site dated April 1988; <br />2. An ALTA Land Title Survey of the site dated November 2001; <br />3. A report entitled "Flatiron Companies Greeley West Pit Feasibility Investigation," by <br />Rocky Mountain Consultants (April 1999); <br />4. "Geologic Map of Colorado" by Tweto, Ogden, (1979); <br />5. Our discussions with City personnel during site visits and telephone conversations; and <br />6. Gravel pond depth data recorded by City of Greeley personnel. <br />7. Our discussions with Lafarge Corporation employees associated with the gravel mining <br />operation on the west side of 35'~ Avenue. <br />2 <br />