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<br />' 3.C.4 Noise Monitoring Program <br />' A noise analysis was done at the Ditmazs Quarry and compazed to the Castle Rock Quany site. <br />Results of the study show that noise levels will be within acceptable limits at the Castle Rock <br />Quazry (see Appendix 8). <br />' 3.C.5 Hours of Operation <br />' CMI will operate the Castle Rock Quarry Monday through Saturday, 7:00 a.m - 6:00 p.m. <br />Equipment maintenance will occur after 6:00 p.m. as needed. <br />' 3.D Phasing Plan <br />Although 442 acres of land will be mined at the completion of the project, CMI will be <br />reclaiming concurrently with mining to minimize the azea of disturbance at any one time during <br />the life of the operation. As mentioned previously, the maximum land disturbance for extraction <br />' and processing at any time will be no greater than 60 acres. Figure 2A (Extraction Plan Map) <br />illustrates the sequence of mining and typical azeas of disturbance including the roadways. The <br />following discussion explains how the rhyolite will be excavated and the land reclaimed. <br />' 3.D.1 Crushed Stone <br />' The method of extraction to be used for the crushed stone aggregate is as follows: <br />' 1) Topsoil and overburden will be removed and stockpiled using scrapers and loaders. The <br />topsoil is up to six inches thick and overburden ranges from four to sixteen feet thick, <br /> with a typical thickness of about seven feet. In some of the mining phases, the <br /> overburden will be stockpiled along the edges of the extraction . This will be an added <br />' sound and visual impact buffer. Stockpiles will be located and aligned to minimize <br /> erosion from both wind and water. Approximately 16,950 tons of topsoil and overburden <br />' material will be removed for each disturbed acre. <br /> 2) Drilling and blasting will be done in phases to loosen the rhyolite. Each phase will <br />' produce approximately 18,000 tons of rhyolite material ready to process. <br /> 3) Front end loaders will remove the loosened rhyolite and load it into a conveyer system. <br />' <br /> 4) The conveyors will carry the rhyolite to the crushing and screening facilities. This <br /> transport method minimizes the amount of truck traffic and thus considerably reduces the <br />' pollution from both fugitive dust and diesel emission. <br />' As shown in the Extraction Plan Maps, a 16 acre plant site will process the rhyolite next to the <br />excavation site. Processing will consist of screening, crushing, and stockpiling materials. The <br />plant site will sit on the claystone floor depressed some 20 to 25 feet below the existing grade. <br />' As mining progresses, conveyor sections will be added. <br />' 17 <br />