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• silty sand is generally loose to medium dense, dry to moist, light brown, with sand and fines <br />(silt and clay), and is generally non-plastic. <br />Sand and Gravel: The sand and gravel is present everywhere on the site overlying the <br />bedrock. The sand and gravel is an alluvial deposit that ranges in thickness from <br />approximately 30 feet to 50 feet, averaging approximately 40 feet. This deposit ranges from <br />gravelly sand to sandy gravel and is generally medium dense to very dense. The sands are <br />relatively clean with fines content (silt and clay) generally less than 10 percent. Lenses of <br />clay ("mud lenses") and fine sand were encountered in some of the borings mostly along the <br />southern portions of the site. The bulk of the on-site alluvial sand and gravel will be <br />excavated, processed, and sold as aggregate products. <br />ll. Nature of the stratum immediately beneath the material to be mined in sedimentary deposits <br />Claystone: Bedrock was encountered across the site at depths ranging from approximately <br />35 feet to 55 feet. The bedrock surface is fairly irregular across the site, ranging in elevation <br />from about 4,880 feet in the southwest to 4,910 feet on the northeast comer of the site. <br />Claystone is the main bedrock facies that was encountered underlying the alluvial sand and <br />gravel. The Claystone is locally silty and sandy with minor lignite zones. The Claystone is <br />generally very hard, moderately to highly plastic, moist to very moist, and is probably part of <br />the Denver/Arapahoe 1=ormations. The Claystone has an average in-situ dry density and <br />moisture content of 118 pcf and 15 percent, respectively. The Claystone has average liquid <br />• limit and plasticity indices of 50 and 34, respectively. <br />(g) Identify the primary and secondary commodities to be mined/extracted and describe the <br />intended use. <br />The primary commodities to be mined are sand, gravel and fill. The primary use of the <br />extracted products is construction materials. Additional material maybe imported and <br />processed at the site. <br />(h) Name and describe the intended use of all expected incidental products to be mined/extracted <br />by the proposed operation. <br />There are no expected incidental products to be mined. <br />(iJ Specify if explosives will be used in conjunction with the mining (or reclamation) <br />No explosive material will be used on-site. <br />SW TKO Joint Venture, LLC. -Adams Sand and Gravel Mine -112 Reclamation Permit Amendment Page 13 <br />