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0_6/28!99 MON 11:01 FAX 303 452 4515 <br />~ • <br />~~ <br />ADCO/CHEROKEE/BAI'ER <br />• <br />The water will either percolate into the groundwater table or in eases of excessive <br />precipitation, will be routed into the excavation for temporary detention and discharge <br />...through dewateting puutps. Other ahernares may involve at grade detention ponds and <br />gravity disclta~ge_ <br />1G. Ftrojest Water Regaireme~b <br />An estimate of water consumption from the proposed operation during and after mining <br />and reclamation is completed is as follows: <br />The wader losses will be, acGOUnted for in an approved Substittrre Water Supply Platt <br />(SWSP) submitted to the Stan Engineers office. Actual losses may vary from the <br />estimates in the table above <br />18. Commeaq from State Englneett Olnoe <br />A 5ltbstitute Water Supply Plan was subtrrimed to the Stare Engineers Office oa March <br />24, 1999 for ttview. <br />21. Grvaadvrater Tmpacb from Slurry Wall <br />The slurry wall is located on the west side of the rives as observed <br />Quantifuatioa of the "lateral and vertical" exunt of the mounding or shadow effect <br />would.vary dependirtg on tune of year, and return flow paRtuns established in lire at+oa. <br />The. vertical tnoutrdiag of growdcvater agaittst a slurry wall could range between 1 ro 5 <br />feet. The. current depth to groundwater in the proposed training area ranges between 5 to <br />7 feet which indicates avery shallow groundwater table. Proposed monitoring wells will <br />give better field data to determine what the impacts will be. <br />Tlie "Errata!^. eictent of the mounding would be a ftmction of seasonal conditions. <br />Generally, return flows, precipitation and recharge from sottrees such as drub seepage, <br />tailwater,. eu. would determine the volume of inflow to the aquifer. The range of this <br />~nitwlding effect would be.expecK.ed to extend betw~aen 500 ro 1,000 feert beyatui the <br />slurry wall. This means that the elevated groundwater levels in the aquifer would be <br />dissipated within this distance.. <br />f~ 003 <br />