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Ms. Michelle Cunico Johnson, Ms. Carrie Spritzer March 14, 2007 Page 2 Laramie-Fox Hills aquifer water pumped from well no. 64401-F. The well is limited to an average annual withdrawal of 15.6 acre-feet per year and is permitted for industrial, commercial, augmentation, dust control, residential and domestic uses. Depletions The annual depletion resulting from evaporation from the 2 acres of exposed ground water is 5.7 acre-feet. Between January 1, 2007 and April 30, 2007 the water lost in mined product will be 3.84 acre-feet from 130,000 tons of mined product. The SWSP request anticipates that the slurry'. wall will be approved prior to April 30, 2007. Once the slurry wall is approved the applicant is no longer required to replace depletions resulting from water lost in mined product, therefoSe the plan does not show any depletions from water lost in mined product after Apri130, 2007. Depletions resulting from,;evaporation and water lost in product were lagged to the stream system based on a Glover analysis and assuming a Stream Depletion Factor ("SDF") of 120 days. The lagged depletions are shown in attached Table 2. Those lagged depletions account for depletions that result from previous operations at the site. Replacements The replacements sources for this plan are nontributary Laramie-Fox Hills water withdrawn by well no. 64401-F and fully consumable water leased from Consolidated Mutual Water Company ("Consolidated"). The applicant has leased water from Consolidated for replacements in March and April of 2007. That water will either be released from the Metro Waste Water Treatment Plant or from a direct release from Maple Grove Reservoir to Lena Gulch. The nontributary Laramie-Fox Hills water will either be discharged into the Ski Lake and recharged back to the river or discharged directly to the river via Brighton's 124`h Avenue Pipeline. If the water is discharged into the Ski Lake, the accretions will be lagged to the river based on a SDF of 100 days. The replacement schedule for January 2007 through July 2008 is shown in the attached Table 3. Conditions of Approval I hereby approve this substitute water supply plan, in accordance with Section 37-90- 137(11), C.R.S., subject to the following conditions: This SWSP shall be valid for the period of January 1, 2007 through April 30, 2007, unless otherwise revoked, modified, or superceded by decree. If the applicant provides evidence to the State Engineer's office that the slurry wall has been approved, prior to April 30, 2007, this plan shall be extended until July 31, 2008. If the pit is not lined and all lagged depletions resulting from the mining operation have not been replaced by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257) by April 15, 2007 (June 1, 2008 if extended).