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1 <br />1 <br />MINING PLAN (cont) EXHIBIT D <br />happens only a few times a year (estimate once a month when mine <br />~ is in full operation) . The operator notifies the Rocky Flats <br />' Plant security division when these occasional shots are to occur. <br />The material is removed by dozers. It is then loaded onto a <br />truck by a front-end loader. Other equipment used in the clay pit <br />and stockpile areas includes, but is not limited to, a scraper, a <br />' Koleman screen, a grizzly and water pumps. <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. When the off-site brick plant calls <br />' for various amounts of each clay, it can be loaded out quickly. <br />A processing area of approximately ten (10) acres will be <br />established as a floating disturbance area. It will be bonded as <br />' such during the entire life of the mining operation. <br />Water consumption for dust suppression can only be estimated <br />' because variables of operating days, windy days, rainy or snowy <br />days and the number of affected acres will fluctuate drastically. <br />Map Exhibit D-1 delineates the proposed mining stages, the <br />sequence of mining and estimated time duration of each mining <br />' stage. This Map Exhibit depicts what the area might look like when <br />mining is approximately 458 complete . <br />' GEOLOGIC SETTING <br />The clay being mined at the Church Pit is from the basal members <br />of the Laramie formation of Upper Cretaceous age. These claystone <br />' beds dip to the east a approximately 45 degrees and the strike is <br />about Nlo 30' W. The normal dip slope of the clay beds is 1:1. <br />' Underlying the Laramie is the Fox Hill formation. The Fox <br />Hill is a sandstone of Upper Cretaceous age. This sandstone is <br />' porous and permeable in most areas within the Louisville quadrangle. <br />There have been no site-specific tests to determine exact figures <br />' on porosity and permeability in the Rocky Flats Pit area. <br />Overlying these steeply-dipping bedrock units at an angular <br />' unconformity is the Rocky Flats alluvium (Qrf). This alluvium is <br />boulder and cobble gravel, predominantly quartzite. The upper <br />1 8 <br />