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H:V excavated sidewalls. Final ditch design will be as required by USACE for <br />obtaining the required Nationwide 46 Permit to move the ditch. Excavated <br />materials will be processed and new wetlands vegetation allowed to become <br />established for at least one year prior to mining adjacent phases. A mining offset <br />of 25 ft will be established on the east (upgradient) side of the relocated ditch, and <br />a 50 ft geotechnical offset will be established on the west (downgradient) side of <br />the ditch to accommodate geotechnical stability considerations for the slurry wall <br />to be installed on the downgradient side following mining. <br />6. Completely backfilling the upland areas of the new expansion area in the <br />southeast part of the proposed new permit area to create cropland as shown on <br />Figure F-1, Reclamation Plan Map will require approximately 2.705 million cubic <br />yards of (placed) fill material. Available overburden from stripping the new <br />mining phases comprises approximately 1.275 million (in-place) cubic yards. In <br />addition, Ready Mixed estimates that it has an additional approximately 1.175 <br />million stockpiled cubic yards of overburden materials from nearby mining to <br />date at Bromley Lakes and Ready Mixed Pit No. 1, and from ongoing mining at <br />Erger's Pond Pit, leaving a net maximum earthwork fill deficit of approximately <br />255,000cubic yards that will require imported fill materials. This deficit may be <br />reduced by reducing the maximum backfill areas shown on the Reclamation Plan <br />Map (Figure Fl) and sloping the reclaimed cropland more to the west rather than <br />creating the maximum possible flat grading shown. <br />7. Creation of an open lake at the current plant site area (Mining Phase 18) <br />comprising approximately 18 acres by performing reclamation grading at 3:1 H:V <br />slopes and establishing native grasses and planting trees and shrubs. As for along <br />the South Platte River, trees and shrubs will be planted with two inch caliper <br />cottonwood trees planted randomly to appear natural, but on average on 40-ft <br />centers. Because of the open water reclamation of acreage within this phase, most <br />of the site area will not be seeded, but will be submerged. <br />8. Long-term evaporative losses for the open lake of approximately 18 acres in area <br />consisting of approximately 45 acre-feet per year. <br />51