Laserfiche WebLink
• ~nks and Gesso, LLC <br />Initial mining operations will include stripping and excavation of the dewatering trenches <br />and settling ponds. After the topsoil and overburden has been stripped, the recovery of <br />sand and gravel in this area will begin. This will be accomplished via front-end loaders <br />and/or backhoes, which will feed an in-pit conveyor system for transport of mined <br />material to the aggregate processing area. The sand and gravel reserve will be mined <br />vertically, followed immediately by placement of backfill materials to stabilize slopes <br />along the walls of the pit. All areas disturbed by mining and processing activities will be <br />graded towards the pit bottom to retain any storm water and sediment runoff on site. <br />Sand and gravel will be crushed, screened, washed, and sized prior to use in the on-site <br />concrete batch plant or transport off-site in direct sales. On-site mining, processing, and <br />reclamation equipment may include crushers, screens, conveyors, radial stackers, <br />dozers, front-end loaders, backhoes, hydraulic excavators, trucks, and scrapers. <br />Earthmoving Operations -Rule 6.4.4 (b) <br />Mining will occur in one phase and will proceed generally from the south end of the site <br />to the north. Topsoil will be removed and stockpiled on-site. A three to eight foot layer <br />of overburden will also be removed, stockpiled, and maintained on-site for later use as <br />backfill material, liner in areas where excavation has been completed, and pad material <br />to support the placement of the concrete batch plant when all aggregate has been <br />mined. Sand and gravel reserves are present to a depth of approximately 34 feet below <br />existing grades. <br />Water Diversions and Impoundments -Rule 6.4.4 (cl <br />Stormwater from all areas of surface disturbance will be directed by grading and shallow <br />ditches toward the mine's dewatering systems. A CDPS permit will be obtained from the <br />Colorado Department of Public Health and Environment for applicable dewatering <br />operations. <br />Aggregate processing water will be separate from the dewatering and Stormwater <br />discharge systems because it is a closed-loop system. With evaporation and product <br />moisture losses, there will be no need for discharge of processing water. Moreover, <br />some dewatering discharges will be diverted back to the processing water system as <br />make-up water, thus reducing total discharge amounts. Settling ponds will be located in <br />Lohmann Sand and Gravel Mine.DMG.112 20055 <br />L.G. Everisl. Inc March 2007 <br />7 <br />