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r <br /> <br />Paul Banks -2- November 23, 1988 <br />4, a. Is the processing plant east of Highway 93 currently operating? <br />Whom does it service? Is it included within the permitted <br />acreage? If operating, where are the wastes currently stowed? <br />b. The processing site may need to be included within the permit <br />boundaries if its primary function is servicing the shale quarry. <br />Please discuss. <br />Runoff Control <br />5. Please discuss the control measures proposed to minimize erosion of the <br />diversion ditch during operations. <br />6. Please contact the State Engineers Office regarding the need fora well <br />permit, as a proposed 10 acre pond is a final reclamation feature. <br />Geology <br />7. Will the 5 to 10 feet of sand and gravel overlying the shale be <br />screened and used for aggregate, or will it be used as backfill <br />material? <br />8. In order to evaluate reclamation plans, please specify the average <br />depth of overburden overlying the shale. <br />9. In order t:o better calculate reclamation costs, please specify an <br />estimate of the overburden volume previously stripped by Great Western <br />and stockpiled on the western edge of the quarry. <br />Ida ste Disposal <br />10. Is the wasi:e disposal site proposed to be compacted with each lift? <br />declamation Plan <br />1. The Division recommends that final quarry slopes be graded no steeper <br />I than 3H:1V to facilitate successful re vegetation establishment and <br />growth, minimize erosion and enhance the rangeland final land use. <br />2. Please consider placing a one-foot gravel layer atop ripped quarry <br />slopes and floor prior to backfilling with no less than 4 feet of <br />overburden to promote subsurface drainage, increase friction to better <br />secure overburden placement and allow for soil-moisture and plant-root <br />penetration. Two to four feet of overburden placed directly atop the <br />impermeable shales at the relatively steep slopes (3H:1Y) proposed may <br />become unstable following major precipitation and/or snow-melt events. <br />Please discuss. <br />3. In addition to water bar and terrace construction, please consider <br />slope manipulation such that smooth, uniform slopes are avoided, <br />thereby creating microclimates for enhancing vegetation and wildlife <br />diversity, anc' minimizing erosion. <br />