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~. <br />~ EXHIBIT D (Cont'd) <br />~ Overburden varies from about 2 feet to approximately 16 feet <br />. from west to east across the property. Average thickness is a <br />meaningless figure because lateral variations are sudden and very <br />^ severe. <br />The SCS reports and MLRB staff concur that the soil is a grayish <br />^ <br />brown-brown cobbly, sandy loam in which the cobbles range from 50 to <br />^ 75 percent by volume. According to the SCS this material is reason- <br />ably uniform in thickness at 18 inches. In all stripping operations <br />^ on the north side approximately the top 18 inches of material will <br />be removed and stacked on the east side of the pit in segregated <br />^ piles from the rest of the overburden. At the request of the MLRB <br />^ staff not only the area to be mined but all areas to be used for <br />soil, overburden or clay material piles or roads will be stripped <br />^ to a depth of 18 inches prior to use. The piles designated soil <br />will be seeded with western wheatgrass to prevent erosion. <br />^ <br />After the overburden is removed, mining is started from each <br />^ of the four clay zones. The material is removed by dozer. It is <br />then loaded onto a truck by a front-end loader. Other equipment <br />^ used in the pit and stockpile areas includes, but is not limited <br />~ - <br />to, a scraper, a Kolema `screen a grizzly an \ water pumps.~~ <br />^ <br />After the various clays are brought out of the pit, they are <br />~ screened to remove material that is too large. The clays are then <br />stored in segregated piles. Whe^ the off-site brick plant calls for <br />^ various amounts of each clay, it can be loaded out quickly. <br />Since mining progresses down the dip of the clay beds and <br /> <br /> <br />north and south along the strike (see map Exhibit D-1 and Sketches 1 <br />9 (Revised) <br />^ <br />