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EXHIBIT D (Cont'd) <br />The sand and gravel below the shallow soil and overburden <br />' varies in thickness fx•om 23 to 51 feet. Exploratory holes were <br />' drilled in January 1972 and March 1973. The sand and gravel <br />deposit is underlain by a relatively impermeable shale. The <br />' shale acts as a bottom for the pit throughout the excavation area. <br />Processing equipment may include, but is not limited to, <br />' crushers, screens, screw washer, log washer, sand classifier, <br />trommel screen and conveyors. The equipment will be operated <br />in compliance with air pollution standards. If required, a ~jl <br />,r/~ n. i <br />' Colorado Department of Health Emission Control Permit will be • L~'~``""'~ <br />obtained. <br />Fencing, currently required by Adams County, will be <br />installed before operations begin. The fence will be the pre- <br />' scribed 72-inch chain link with three strands of outward- <br />I' ~ canting (45°) barbed wire at the top. <br />The small amount of water to be used in dust control and <br />' plant operation is highly variable since operating days, windy <br />days, rainy days and number of affected acres fluctuate drama- <br />tically. See Exhibit G for detail of water conditions. <br />' The operator's intention is to minimize disturbances to <br />the prevailing hydrologic balance of the affected land and of <br />the surrounding area and to the quality and quantity of water <br />in surface and ground water systems during and after the mining <br />' operation. <br /> <br />1 _8_ <br />1 <br />