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<br />• hoppers and transfer points will be utilized to provide in-pit loading locations and conveyance to the <br />gravel plant area. No stockpiling is proposed within the 100-year floodway. Other possible <br />equipment will include a dozer and an excavator, and miscellaneous support vehicles. <br />A wash water pond will be established at the north end of the gravel plant azea which will be filled <br />from the dewatering trench. The plant will dischazge wash water to an in-pit sedimentation pond <br />which will dischazge clear water back to the dewatering trench. Concrete and asphalt hatching will be <br />done on site and is anticipated to constitute the primary disposition of the processed sand and gravel <br />(approximately b0 percent). Concrete and asphalt, and to a lesser extent sand and gravel, will be <br />hauled from the site east on County Road 20.5 to Rinn. Trucks will then head north on County Road <br />7 to State Highway 119 W connect to destination roads. Hauling west on County Road 20.5 will be <br />limited to local deliveries within approximately five nilles of the operation to the west and southwest <br />where County Road 20.5 west provides a more direct route. <br />Reclamation grading and seeding will follow the mining operation. The following exhibit, Exhibit E - <br />Reclamation Plan, provides the details of the proposed site reclamation which, in general, wili wnsist <br />• of regrading and seeding excavation slopes, constructing aneast-west earth dike across the center of <br />the site to create two reservoirs with irregulaz shorelines if a sealed water storage facility is <br />completed, and planting trees and shrubs along Boulder Creek to enhance riparian habitat. <br />Slurry wall construction has been considered both as a potentially necessary mining operation element <br />and as an optional reclamation plan element. Detailed engineering of the optional slurry wall is <br />proposed to be done after a permit is obtained or very soon after mining has begun when performance <br />evacuations can be made, or should reclamation as a sealed water storage facility be desired. <br />During mining, no slurry wall should be required to limit ground water inflows to the mining <br />excavation, except possibly along a portion of the west edge of the Groom parcel (k131316000034) <br />where an open lake (reclaimed sand and gravel pit) exists. Construction of a partial or complete <br />slurry wall surrounding the permit area may occur prior to mining in that azea, depending upon costs <br />and return. Cooley proposes to install two ground water monitoring wells along the west side of the <br />existing open lake within the 30 ft setback and evaluate the need for, and potential optional design <br />length of, a slurry wall along the eastern property boundary to limit potential impacts to the lake and <br /> <br />11 <br />~~~ <br />