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' • EXPSBIT D (Cont'd) <br />' higher quality than the water in the river. Downstream fisheries <br />will not be adversely affected because of dewatering. The <br />current NPDES permit expires on June 30, 1979, and will be <br />renewed as required. <br />Pit run material is extracted with a front-end loader and <br />' loaded out to the off-site gravel plant. Various methods of <br />mining and moving the material will be used during the life <br />of the operation. Equipment used in mining and moving may <br />' include, but is not limited to, front-end loaders, dump trucks, <br />graders, dozers, grizzly, water trucks, water pump, drag line <br />' and a conveyor system. Sand and gravel varies radically in <br />thickness from one area to the next. The southern section of <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br />Area 1 has 30 to 40 feet of material. The northeastern part <br />of that area has only about 15 feet of mineable material. In <br />Area 2 the thickness varies from 35 feet on the north side to <br />as little as 10 feet on the southwest side. Deposit thickness. <br />in Area 3 is fairly uniform, varying from 45 to 50 feet. In <br />Area 4 the sand varies from 21 to 55 feet across the property. <br />The sand and gravel deposit in this river bottom is under- <br />lain by a relatively impermeable gray shale. It is this shale <br />that will be the bottom of each excavation and will provide a <br />reasonably regular bed for the lakes to be created. <br />Large numbers of cottonwood, willow, Russian olive and <br />tamarisk trees have been or will be removed in Areas 1 and 9 <br />prior to moving the overburden. These trees will be cut for fire- <br />wood for use by local residents. The residue will be hauled away <br />9 <br />