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' • •XHIBIT 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 /> i <br />li <br />i <br />ll <br />h <br />i <br />d <br />i <br /> n comp <br />ance w <br />a <br />r po <br />ut <br />on stan <br />ards. If required, a <br />t <br /> Colorado Department of Health Emission Control Permit will be <br /> obtained. <br /> Fencing, currently required by Adams County, will be <br /> installed before operations begin. The fence will be the pre- <br />' crib <br />d 72 <br />h <br />hai <br />k <br />rd <br />i <br />li <br />ith th <br />d <br />f <br />t <br />t <br /> - <br />s <br />e <br />nc <br />c <br />n <br />n <br />w <br />ree s <br />ran <br />s o <br />ou <br />wa <br />- <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 /> 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 />' ti <br /> opera <br />on. <br /> <br />- 8 - <br /> <br />