Laserfiche WebLink
Mining will begin in the southeast corner of the proposed Pit 1 area and progress in stages with <br />excess overburden used to reclaim the previous stage. Gravel will be processed on -site and <br />delivered to the scales in the southwest corner of the permit area via the proposed haul road. <br />This haul road will utilize the existing 33 Road Drain access roadway running along the south <br />end of the permit area. It is currently maintained by Grand Valley Drainage District but will be <br />improved by United Companies, as necessary, in accordance with safety requirements and dust <br />control standards. Also, M.A. Concrete Construction currently uses the western portion of the <br />access for their truck traffic to and from their 32 1 /2 Road Pit, located immediately south of the <br />Otter Creek Pit, as shown on Maps C -1 and C -2. <br />A sediment collection pond will be located in the southeast portion of Pit 1 where mining <br />activities begin. Collection ditches will exist along the east, north and south sides of the <br />excavation to direct all runoff into the sediment pond. As the excavation deepens, the sediment <br />pond and the ditches will be lowered accordingly. At no time will runoff be allowed to go offsite <br />without having entered the sediment control system. As the berm is built, hay bales will be <br />placed along the outside toe of the berm to provide alternate sediment control there, since these <br />slopes will not drain to the sediment pond system. Also, the berm will be seeded with an <br />immediate cover crop of oats, at a rate of 80 lbs per acre. Since this location is extremely dry, the <br />cover crop of oats will provide stability for the soil, the roots will lessen erosion and there will <br />also be nitrogen fixing from the oats, thus improving the soil. Within 12 months, the berm will <br />be seeded with the dry range permanent seed mix, as described in Exhibit E. <br />As mining continues beyond the initial 10.8 acres, it will expand outward, generally to the north <br />and west, with collection (dewatering) trenches funneling groundwater back to a sump. From <br />this sump, water (groundwater and collected runoff) will be allowed to gravity flow to the <br />sediment pond. If groundwater inflows into mined areas 1 and 2 requiring a large dewatering <br />operation, then a new sump may be located along the eastern edge. Discharge from the pond <br />will be through a pump that pumps the water to a recently installed (2012) 8" diameter plastic <br />pipe to the 33 Road Drain, a large open - channel tailwater drain that collects surface runoff and <br />irrigation tailwater from a large upstream basin. Approximately 1 /4 mile south of the proposed <br />Otter Creek site, the 33 Road Drain empties into the Colorado River. The sediment pond will <br />Otter Creek Pit December 12 D - <br />