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Job No: 3605.00-003,:U Client: LOVtLAK{R"- Page� of 6- <br /> TELEST <br /> � - M��Y�"�. <br /> Task:1+n f`1tarotor Computed By:W. N" Date: 3/5/1 <br /> SOLUTIONS* 1 14 CORPORATE D <br /> MWWW _ Checked By: . Date: 1 <br /> Calculations and Results con'd: <br /> 1. Analytical Element Model: <br /> c. Simulations— results <br /> R:\La ri merCou nty_CO\Lovela nd Rea dyM ix\La Porte\Ca Icu lations\I nfi Itrator\knox2 <br /> Simulations - Tilley Mitigation <br /> 5070 'Prbprvt gD1"tvt'apy-� <br /> 5065 <br /> 5060 - <br /> A <br /> a 5055 <br /> > 5050 pi <br /> ui 5045 - <br /> 5040 <br /> 5035 <br /> 5030 <br /> 0 100 200 300 400 500 600 700 800 900 <br /> Distance along Cross Section <br /> -- Appx Ground Pre-Mining - — -PH1-Max Drawdown Infiltrator Alone - -Backfill Starts <br /> 2. Infiltrator Capacity—orifice equation—calculate required head to maintain 1/3 of pit <br /> inflow, which is estimated at 900 gpm. <br /> f <br /> Perfs:=1 ", g:=32.2ft I z <br /> s <br /> perf pipe:=80 ft <br /> Areaperfs:=Perfs.perf pipe Areaperfs=0.555E <br /> C�:=.62 <br /> Q:-300 man Q=Areaperfs'C,- 2-9-AH <br /> 2 <br /> AH:= - -1Area Q C,1 AH=0.01782ft <br /> 111 perfs <br /> Conclusions: <br /> 1. The infiltrator as designed will keep water levels beneath the Tilley property near the <br /> summer-time levels at the earliest stages of pit development,when drawdowns (difference <br /> between non-mining and mining groundwater levels) could potentially be their largest <br /> 2. Groundwater levels at the infiltrator will be near ground surface <br /> 3. There is more than adequate capacity for the infiltrator to provide sufficient water to <br /> maintain the required groundwater elevation <br />