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and the area proposed to be added is believed to vary from <br /> 30 - 50 feet in depth. However, because of the location of <br /> the Stremme & Gates Ditch, which rises from the river at the <br /> eastern end of the property toward the cliff top nearer the <br /> western end of the property as overall elevation drops, <br /> gravel will generally be mined to a depth of no more than <br /> 30 - 35 feet. This will be true in the originally proposed <br /> Phase II, if that is mined, and in the entire additional <br /> area to be added to the west of permitted area. The opera- <br /> tor' s experience so far has been that he tends to hit bedrock <br /> at about the level of the ditch. <br /> The operator proposes to move steadily westward from <br /> the present location of actual excavation. The rate of <br /> progress will vary with the volume of sales from current <br /> stockpiles and with the width and depth of the gravel deposit <br /> in the area being mined. At the time of this application, <br /> the operator estimates that the mining operation will move <br /> westward about 100 feet in 1984 . If sales should be partic- <br /> ularly good, however, more gravel will be needed; he would <br /> estimate maximum westward progress to be about 300 feet. <br /> The rate of progress may be expected to accelerate when <br /> mining operations at the operator' s Avon Pit are completed. <br /> Therefore, the operator' s overall estimate is that the <br /> mining of the area proposed to be added to the permit should <br /> be completed in seven-to-ten years. <br /> If the operator then determines that it is economical <br /> to mine the present stockpile and work area toward the middle <br /> and eastern end of the presently permitted area, he estimates <br /> that mining there could be completed within ten-to-fifteen <br /> years from now. <br /> Once mined, the sand and gravel has been and will be <br /> crushed, processed, and stockpiled by conveyors. The result- <br /> ing aggregates are used for the construction of streets, <br /> highways, parking lots, etc. , both as granular bases and in <br /> asphalt pavements, and for the provision of sand and sand <br /> and gravel mix for use in masonry and concrete construction. <br /> -2- <br />