Laserfiche WebLink
The reclamation plan calls for returning the disturbed areas, after mining and reclamation to three ponds located <br />in the south, central and the northwest portion of the mined areas and agricultural land use in the northeast <br />portion of the site. These land uses are consistent with those found in the surrounding area and the adopted <br />community land use plans. <br />The post mining land use calls for the development of agricultural/rangeland in Extraction Area A. The <br />accompanying Reclamation Plan Map depicts the relationship of the agricultural area to the property boundary, <br />roadway access, and other features. A key element of the reclamation plan calls for re-grading Extraction Area A <br />using the stockpiled overburden removed as part of the initial mining operation. Backfilling of the mined area will <br />be a "controlled" fill operation. To insure uniform compaction, a geotechnical engineer will be consulted to <br />develop a plan for backfilling this area. These areas will be re-vegetated as outlined later in the exhibit. <br />The predominate feature of the post mining development will be 59.7 acres of Private Open Space, or 57 percent <br />of the total site area, The open space will consist of three lakes. The first lake will be constructed within Extraction <br />Area B and will be 12.3 acres in size. The second lake will be constructed in Extraction Areas C and D and will be <br />26 acres in size. The third lake will be constructed within Extraction Areas E and F and will be 18.7 acres in size. <br />Slopes surrounding the lakes will not exceed 3H:1 V and will be seeded utilizing natural grass seed mix. <br />The agricultural portion of the post mining land use will be graded in a fashion so that all developed storm water <br />flows will be directed into the pond area, which has adequate storage to serve as a storm water retention facility. <br />Since the constructed wetland area is depressed, future run-off will be non-existent, thus eliminating any negative <br />impacts on the existing drainage system or the Colorado River. <br />BACKFILLING AND GRADING - As each of the extraction areas have the resource removed, backfilling and <br />grading activities will commence, except for the working gravel face(s). In this way, much of the reclamation of <br />previous phases will be done on an ongoing basis. The stockpiled overburden will be hauled from its storage area <br />located near the mining area by mobile equipment and placed where required to achieve a level topography and <br />properly backfilled slopes. All slopes will be re-graded no steeper than a ratio of 3:1 (horizontal to vertical). <br />Grading will be done by dozers, and/ or, loaders which will compact and stabilize the overburden material through <br />normal operations. <br />Selective handling or placement of overburden materials will not be necessary. The overburden is a stream laid <br />deposit, which should not present any toxicity problems. <br />TOPSOIL REPLACEMENT -The sequence for removal, stockpiling and replacement of topsoil is described in <br />the Mining Pfan. Topsoil replacement will occur once all re-grading of an area disturbed by mining is complete. <br />Topsoil will be replaced to a thickness of 6 to 8 inches to establish vegetation communities consistent with the <br />post-mine land use. The topsoil will be replaced with mobile equipment. There is 130,680 cubic yards of topsoil <br />removed from the excavation areas that will be used to construct berms with the excess being stockpiled. Since <br />three lakes are being constructed as part of the reclamation, the quantity of topsoil needed to reclaim all the <br />mined areas is 11,376 cubic yards. The excess topsoil will be used as overburden in backfilling the necessary <br />areas. <br />RE-VEGETATION -The intent of the re-vegetation in all areas is the establishment of plant communities <br />consistent with the post-mine land use. After topsoil replacement from stockpiles, seed bed preparation and <br />stabilization may include one of the following: ripping, disking, harrowing and furrowing. Continuous analysis of <br />re-vegetation success will determine the best type of preparation that should be used. <br />Revised October, 2002 <br />