2007-08-10_REVISION - M2001107 (4)

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tieotuchnical Engineering Repx. Gravel Evaluation Northwest of Wetd County Roads 18 and 25 Weld County, Colorado Terracon Project No. 21035117 Terracon The borings were located in the field by the owners. Ground surface elevations at each boring location were not obtained. The accuracy of boring locations should only be assumed to the level implied by the methods used. Lithologic logs of each boring were recorded by the field. engineer.during the- drilling operations.:: At selected intervals, samples of the subsurface materials•were.takernfrom,auger cuttings: ~ s. ~;, =.~:,, r...;; , . ... Groundwater conditions were evaluated in.each boring:at the time of s~te,exp~loraUOn: y rvi Laboratory Testing All samples retrieved during the field exploration were returned to the laboratory-for observation by the project geotechnical engineer and were classified: in_accordance with thet UnifiedtSoil Class~ficafion ' "` System described in Appendix C. Samples of bedrock were classified in accordance with the general notes for Bedrock Classification. At that time, the, field descriptions were confirmed or modified as necessary and an applicable laboratory testing program, was formulated to determine engineering properties of--the subsurface materials. Boring logs--were prepared-and are., presented m Appendl~A~ Laboratory tests were conducted .on aelected soil;and;bedroGk sammples, and ~re~~preserited or~,the_ boring logs and in Appendix B. The test;resul4s were used for the gravel evaluation A1131'aboratoty " tests were performed in general accordance•with the applicable,local or. ptheF accepted~~taridards s,~;:: Selected soil samples were tested for the following engineering properties: • Moisture Content • Grain Size • Plasticity Index , SITE CONDITIONS Y .. The site was located in an agricultural area and appeared to be cultivated for hay. There was an existing residence on the west portion of the site as well as two oil and gas pump jacks, one on the west portion of the site and one on the east. The si±e was vegetated in large part ~h~ith short grasses and in various portions with tall native weeds. Several deciduous trees •n,~ere cbseived near ?he existing residence. The site was bordered by a bluff to the west, agricultural land to the north, Weld County Road 25 to the east. and by an existing grave! mining opertion to the south. '1 ~I :' z • I ::~~ i .^i I 2