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Because the land is relatively level there is little sail loss as a <br />• result of this process. On steep slopes soil loss can 6e a serious <br />problem. The only soil lass is in small strips around the initial <br />e;:cavations and this loss is caused by the unsafe situation of equipment <br />operating near a partially er.cavated area where the working face may be <br />anywhere from 20 to 80 feet high. Using this method it is estimated <br />that approximately 1% of the total soil on the site would be lost into <br />product. The only way to avoid this lass is strip essentially the <br />entire area of its soil. This would be unwise with such a long-lived <br />operation as it would expose a great deal of sand surface which would <br />erode in the winds and make significant contributions to particulate air <br />pollution. In such a developed and developing area as this such <br />pollution would 6e unacceptable. In our opinion, a loss of 1% of the <br /> soil is 'a small price to pay for lioiting the much greater problems of <br />• " <br />" <br /> severe air pollution due to the production of sand storms <br />. <br />The second step in the process is to begin the vertical excavation <br />of the sand. Much of the initial area is opened and sand is removed in <br />small lifts. At the same time the road into the pit is shifted about so <br />as to gain access to the extraction as well as maintain grades suitable <br />for the operation of the haul trucks. <br />As the pit is deepened a working face develops (this is the third <br />step in the process) where the sand simply sloughs into the pit and is <br />loaded into the trucks. The paint at which this initial pit is expanded <br />is determined primarily by the grade of the road into the pit. When it <br />reaches the workable limit of the trucks then a larger area is opened. <br />• <br />F'A6E 4 OF it - EXHIEIT D <br />