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January 9, 2004 <br />Rollin Consulting <br />840 Eagle Drive <br />Eaton, Colorado 80615 <br />Attn: Mr. Ken Rollin <br />Re: Gravel Evaluation <br />' Northwest of Wetd County Roads 18 and 25 <br />Weld County, Colorado <br />Terracon Project No. 21035117 <br />1 r~rracon <br />1289 Rrst Av~n4e <br />cost axe Box n4a <br />Greeley, Cobretlo Bl)632-1744 <br />(970)357-0460 Fax: (970)353-8039 <br />Terracon has completed a geotechnical engineering exploration for the proposed gravel pit to be <br />located northwest of Weld County Roads 18 and 25 in Weld County, Colorado. <br />The results of our engineering study, including the boring location diagram, laboratory test results, <br />~~ test boring records, and our findings needed to aid in the evaluation of the site as an economic <br />source of sand and gravel are attached. <br />'i The overburden soils at the site generally consisted of approximately six inches of topsoil underlain <br />by lean clay soils with varying amounts of silts and sands that extend to depths of 3 to 6 feet, Silty <br />r sands and fine-grained poorly graded sands with silt were encountered in test borings B-1 through B- <br />3 at depths of 3 to 7 feet. Sand and fine gravel underlies the overburden in the majority of the site <br />and extends to the bedrock below. Cfaystone bedrock was encountered at depths of 26 to 28 feet <br />~+ below the surface. The results of our field exploration and laboratory testing indicate that good <br />quality sand and fine gravel suitable for use in some construction materials were encountered in small <br />to moderate quantities at the site. <br />Based on our engineering analyses, approximately 1,775,353 cubic yards of sand and fine gravel <br />exist at the site. Approximately 541,266 cubic yards of overburden would have to be removed to <br />° obtain the sand and fine gravel for this area. Since the majority of the aggregate is below <br />groundwater, dewatering of the site will be required to mine the material: <br />t <br />We appreciate being of service to you in the gravel evaluation phase of this project, and are prepared <br />to assist you during the further testing and mining phases as well. If you have any questions <br />} <br />Arizona ~ Arkansas ~ California ~ Colorado ~ Georgia ~ Idaho ~ Illinois ~ Iowa ~ Kensas ~ Kentucky ~ Minnesota ~ Missouri <br />Montana ~ Nebraska ~ Nevatla ~ New Mexico ~ NoHh Carolina ~ Oklahoma ~ Tennessea^ Texas^ Utah^ Wisconsin^ Wyaning <br />Consulting Engineers & Sden9sts Since 1965 <br />www.terracon.com <br />