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• • <br />' EXHIBIT D (Cont'd) <br />1 <br /> The sand and gravel below the shallow soil and overburden <br />' varies i n thickness from 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 />i ^ in compliance with air pollution standards. If required, a ~ ~.,' <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 />' 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 />i 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 /> <br />- 8 - <br />1 <br />