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Mr. Chris Rowe <br />December 8, 2006 <br />Page Two of Six <br />The maximum dischazge pump rate to the ditch will be approximately 2,000 gpm. <br />The daily discharge rate is projected to be less than 0.50 million gallons per day <br />or less than 0.05 % of the carrying capacity of the ditch. <br />6. The Applicant will provide the Division with a copy of the Substitute Water <br />Supply Plan (SWP) for the Camenish Borrow once said SWP has been approved <br />by the Office of The State Engineer (SEO). <br />The Camenish Borrow site will be dewatered prior to excavation of sand and <br />gravel. Once enough material has been excavated, the perimeter of the excavation <br />will be sealed with a compacted liner thereby eliminating any further depletion to <br />the sunrounding alluvial aquifer. Therefore, during excavation, impacts to the <br />existing hydrologic balance will be minimized by the limited duration of the <br />dewatering operation (approximately 12 months) and by the fact that the <br />excavafion will be sealed as part of a process of concurrent excavation and <br />reclamation. In addition, there are no known registered groundwater wells within <br />600 feet of the proposed excavation site; therefore, briefly dewatering the <br />Camenish site will have no adverse effects on any wells in the area of the pit. <br />There is no evidence that the proposed Camenish Borrow operation will adversely <br />effect the prevailing hydrologic balance in the vicinity of the site. <br />63.4 EXHIBIT D -Reclamation Plan Resuonse <br />The construction method used to seal the pit from the surrounding alluvium <br />involves the placement of a compacted backfill core azound the perimeter of the <br />excavated pit floor. This method is similar in many ways to the conventionai way <br />sand and gravel pits aze reclaimed in that once mining is completed the perimeter <br />of the pit is backfilled using the overburden and topsoil that was set aside during <br />the process of preparing the pit for mining. While there may be no discernable <br />difference in the appearance of a conventionally reclaimed pit and a sealed pit <br />there are significant differences in the methods of construction. <br />In order to effectively seal a pit with compacted backfill the contact between the <br />sand and gravel alluvium and the pit floor, which in most instances is composed <br />of shale or clay stone, must by sealed. To accomplish this, a keyway, which is <br />typically a three foot deep by twelve-foot wide slot, is excavated in the pit floor <br />