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Lisa C. Ledet Page 2 <br />January 9, 2008 <br />precipitation is considered to affect stream flow on a lagged basis, and CC&V has computed <br />lagging for each area separately. Should the actual amount of azero-discharge area be less <br />than the acreages used to compute the maximum depletion, actual depletion will be reduced <br />proportionally. <br />Second, there are sediment detention ponds at the site that, when containing water, will <br />evaporate water. Shown in the table below are your estimates of maximum monthly depletions <br />from the ponds. Actual depletions will be assessed on any pond that contains a free water <br />surface for more than 72 hours using the monthly evaporation rates given in the table, pond <br />surface area, and number of days the pond contains water. <br />Finally, water is pumped back from an underdrain and spring collection system intended <br />to reduce potential hydraulic head at the base of the mine's engineered liner system. This <br />pumping will be metered and replacements made equal to pumping, in the following month. <br /> BEAVER <br /> FOURMILE CREEK CREEK <br /> No- No- Evaporation No- <br /> Discharge Discharge from Discharge <br /> Area Area Sediment Area <br /> Inside Outside Detention Pump Back Outside <br /> Diatreme' Diatreme' Ponds S stem Total Diatreme <br /> <br />Maximum <br />Size <br />152.3 ac <br />214.9 ac <br />13 ac <br />0 ac <br />Monthl Eva oration <br />Month in ft <br />Jan 1.36 2.02 0 as meteredZ 3.38 0 0.1 0.01 <br />Feb 1.35 1.91 0 3.26 0 0.8 0.07 <br />Mar 1.36 1.82 0.08 3.26 0 1.4 0.12 <br />pr 1.36 1.73 0.15 3.24 0 2.6 0.22 <br />May 1.36 1.70 0.19 3.25 0 3.3 0.28 <br />Jun 1.36 1.73 0.26 3.35 0 4.5 0.38 <br />Jul 1.36 1.77 0.23 3.36 0 3.9 0.33 <br />ug 1.36 1.86 0.15 3.37 0 2.6 0.22 <br />Sep 1.36 2.02 0.17 3.55 0 2.9 0.24 <br />Oct 1.35 2.16 0.12 3.63 0 2.0 0.17 <br />Nov 1.36 2.16 0.05 3.57 0 1.0 0.08 <br />Dec 1.36 2.12 0 3.48 0 0.2 0.02 <br />Total 16.3 23.00 1.40 as metered' 40.7 0 25.3 2.11 <br />1) Depletion of historic natural runoff = 0.107 ac-ft/ac <br />2) CC&V Estimates up to 30 acre-feet annually <br />Units in acre-feet unless otherwise noted. <br />REPLACEMENT <br />. -~, <br /> <br />The source of replacement water will be discharge of water purchased from the Town of <br />Victor. Deliveries to the Fourmile drainage are made into Wilson Gulch at the Town of Victor's <br />