Laserfiche WebLink
<br /> <br />Mr. Paul E. Thomsen - 2 - July 14, 1993 <br />EXHIBIT D - Mining Plan <br />(continued) <br />2. The Mining Plan states that all of the previously stripped material plus <br />all of the remaining overburden during the life of the quarry will be <br />used by the plant. The Division requests that the applicant identify <br />methods during mining and road construction which would allow segregation <br />of fines or soil materials for reclamation. This will be discussed again <br />under the Reclamation Plan. <br />3. How will erosion be controlled on acreage disturbed by mining anc roads? <br />Will diversions be necessary to keep off-site runoff from enterirg the <br />area disturbed by mining? As mining proceeds and additional acres of <br />sandstone slab are exposed prior to reclamation, what means or <br />structures, such as interceptor ditches, berming, riprap in drainages, <br />' and/or sediment basins will be used to control rapid runoff and <br />subsequent erosion downslope? <br />Temporary erosion control structures must be sized for the <br />10-year 24-hour event while permanent structures left after mining and <br />reclamation should be sized for the 100-year 24-hour event. Please <br />submit sizing and describe location andtor intervals downslope where <br />structures will be located. <br />EXHIBIT E - Reclamation Plan <br />Please provide the Division with approximate total surface of tre~a pad <br />per acre of surface disturbed. Runoff from the exposed mining surface <br />will accelerate and increase in volume as slope lengthens. The Division <br />requests the applicant identify a staggered placement pattern for both <br />pads and rock pile fines traps that will intercept runoff so that the <br />slope length between pads will be limited to what runoff can be <br />adequately intercepted, infiltrated, and retained by the growth medium. <br />Please submit a diagram that identifies approximate pad and piles <br />placement and spacing along the contour and maximum slope length between <br />any two pads. Please indicate approximate width and height of rock piles <br />and their configuration along the contour. <br />2. The Division recommends that tree pads be sloped slightly inward i.o <br />increase infiltration and control runoff. <br />3. The Division has requested that methods for fines/soil salvage be <br />identified to provide adequate quantities of growth medium for the pads. <br />If it is necessary for soil to be brought to the site, this soil should <br />be like-textured (sandy, sandy loam) to encourage growth of native, <br />adapted species, both seeded and volunteer. Please discuss growth medium <br />proposed. If both soil and growth medium is combined, what would be the <br />approximate percentage of each. If salvaged on-site fines or soils can <br />supply a portion of the total medium, what would be the approximate <br />percentage that each contributes. <br />4. Please submit a native seed mix as recommended by the Soil Conservation <br />Service, indicating pounds by species of pure live seed per acre. What <br />seeding ,method will be used? <br />