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. inches across) will be created; however, these fines, if not sold, will be distributed across the <br />quarry floor and covered with the salvaged plant growth medium for reclamation. <br />(dl Deposit Thickness <br />The commodity to be extracted is a horizontal sandstone bed of varying thickness up to 15 feet <br />thick and which outcrops on the site. <br />(e) Mine Components <br />No permanent structures will be built for the Canyon Rim Stone Quarry. The affected azea will <br />be accessed along existing roads; no new roads will be built. Processing equipment will consist <br />of rock chopper, skid loader. This processing equipment will be brought to the site for <br />intermittent processing and stockpiling of processed materials and then removed from the site. <br />(fl Disturbances <br />All disturbances will occur in the pit area of the operation. A level area of about 1 acre and an <br />open bench face currently exist after previous (pre-law and landowner materials gathering) <br />mining activity. The initial development of the Canyon Rim Stone Quarry will use the existing <br />disturbed area for topsoil stockpile, storm water detention sump, and initial processing as shown <br />on the Mining Map. The pit will continue by developing a workable face along the contour of <br />the permit area generally following the existing open faces. The overall slopes of the quarry will <br />be less steep than 3H:1 V and are not anticipated to be over 15 feet high. The quarry slopes will <br />consist of bench faces approximately 2 feet high with bench widths of approximately 6 feet. <br />Because the sandstone is fractured to varying degrees, the quarry slopes are not anticipated to be <br />• uniform; however, all highwalls will be in competent sandstone. The initial quarrying will take <br />place near the southeast corner of the quarry and create a stormwater detention sump. <br />Since the highwall is anticipated to be no higher than 15 feet and the overall slope will be no <br />steeper than 3H:1 V, no geotechnicai stability evaluation is considered necessary in reference to <br />Rule 6.5. <br />No other disturbances are planned for the Canyon Rim Stone Quarry operation. <br />Roads <br />The existing ranch road will be used; no new roads are required for operation. <br />(hZWater Consumption <br />Water for dust abatement is not anticipated to be needed for the quarrying operations. <br />(il Water Management <br />No springs aze known to occur in the azea. Groundwater is not anticipated to be encountered. <br />No surface water of consequence will be intercepted as only small topographical depressions <br />occur above the quarry. Incumbent rainfall and snowmelt (stormwater) shall be directed to a low <br />portion of the quarry for retention and/or percolation into the soils. Stormwater will not be <br />allowed to leave the affected area. Sediment from any surface water flow will be retained in the <br />affected azea, and no impacts due to sediment are anticipated. No chemicals will be used in <br />• processing, and no impacts to water quality due to chemicals will occur <br />4 <br />