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Michael D. Shimmin Page <br />April 18, 2006 <br />containing the mined deposits) and those outside the boundary of the diatreme. Capture of <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 is 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 prevent leakage of cyanide from off the site. This pumping will be metered and replacements <br />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 />Maximum <br />Size 248.1 ac 214.9 ac 13 ac 8.4 ac Monthl Eva oration <br />Month in ft <br />Jan 2.21 2.02 0 as metered' 4.23 0.05 0.1 0.01 <br />Feb 2.21 1.91 0 4.12 0.04 0.8 0.07 <br />Mar 2.21 1.82 0.08 4.11 0.05 1.4 0.12 <br />Apr 2.21 1.73 0.15 4.09 0.08 2.6 0.22 <br />May 2.22 1.70 0.19 4.11 0.12 3.3 0.28 <br />Jun 2.22 1.73 0.26 4.21 0.11 4.5 0.38 <br />Jul 2.22 1.77 0.23 4.22 0.12 3.9 0.33 <br />Aug 2.21 1.86 0.15 4.22 0.11 2.6 0.22 <br />Sep 2.21 2.02 0.17 4.40 0.08 2.9 0.24 <br />Oct 2.21 2.16 0.12 4.49 0.05 2.0 0.17 <br />Nov 2.21 2.16 0.05 4.42 0.04 1.0 0.08 <br />Dec 2.21 2.12 0 4.33 0.05 0.2 0.02 <br />Total 26.55 23.00 1.40 as metered' 50.95 0.90 25.3 2.11 <br />1) 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 />