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<br />Revised 1 August /994 <br />Reclamation grading and seeding will follow the mining operation. The following exhibit, Exhibit E - <br />Reclamation Plan, provides the details of the proposed site reclamation which, in general, will consist <br />of regrading and seeding excavation slopes, constructing an east-west earth dike across the center of <br />the site to create two reservoirs with irregular shorelines if a sealed water storage facility is completed, <br />and planting trees and shrubs along Boulder Creek to enhance riparian habitat. <br />Slurry wall construction has been considered both as a potentially necessary mining operation element <br />and as an optional reclamation plan element. Detailed engineering of the optional slurry wall is <br />proposed to be done after a permit is obtained or very soon after mining has begun when performance <br />evaluations can be made, or should reclamation as a sealed water storage facility be desired. <br />During mining, no slurry wall should be required to limit ground water inFlows to the mining <br />excavation, except possibly along a portion of the west edge of the Groom parcel (11131316000034) <br />where an open lake (reclaimed sand and gravel pit) exists. Construction of a partial or complete slurry <br />wall surrounding [he permit area may occur prior [o mining in that area, depending upon costs and <br />return. Cooley proposes to install two ground water monitoring wells along the west side of the <br />existing open lake within the 30 ft setback and evaluate the need for, and potential optional design <br />length of, a slurry wall along the eastern property boundary to limit potential impacts to the lake and <br />associated water rights. If conventional wet mining with a dragline or long-reach backhoe is <br />performed, then no lowering of the gravel lake would occur. No slurry wall is planned along Boulder <br />Creek if conventional dry mining is performed because dewatering water will be discharged to the <br />creek. No negative impacts to Boulder Creek are anticipated. A schematic detail showing a typical <br />mining plan section including the optional slurry cutoff wall is included on Figure D-1, Exhibit D - <br />Mining Plan. <br />A slurry wall Completely surrounding the site is also heing considered as an optional reclamation plan <br />element. Current plans are for reclamation as an open lake in contact with ground water. The water <br />information included in Exhibit G and [he augmentation plan heing prepared for the State Engineer's <br />office are for the open lake option and associated consumptive use through evaporation. Depending <br />RPo197].198 A I - 6 <br />K°A <br />