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OFFICE OF THE STATE ENGINEER Division of Water Rewurtts Department of Natural Restmrces 1313 Sherman Street, Room 818 Denver, Colorado 80203 Phone 130:1} 866-3581 FAX (3U3) 866-3589 w~w¢warerstah+.co. us Permit #: Ivl'~,e 0 Class: ~2rr..iY From: O S E Doc. Name: w }; Doc. Date (if no date Inspection Date Mr. Ben Miller Greg Lewicki and Associates, PLLC 11541 Warrington Court Parker, Colorado 80138 RE: 2006-7 Glen's Pk, Substitute Water Supply Plan NE '/. Section 11, T6S, R93W Water Division 5, Water District 39, Garfield County DMG #M-2005-075 Expiration Date of Plan; May 31, 2008 Dear Mr. Miler: This letter is in response to the application submitted in November, 2005, and resubmitted in April, 2006, requesting approval of a substitute water supply plan (SWSP) to be operated by United Companies ("Applicant") in accordance with Section §37-90-137(11), C.R.S. The applicant shall be responsible for compliance with this plan, but the State Engineer's Office may also pursue the landowner for eventual compliance. The required fee of $1,343 for the substitute water supply plan has been paid. Glen's Pit is a proposed gravel mine that will be reclaimed as an unlined pond. This plan describes the proposed water uses for the period June 2006 through May 2008. During mining, up to 3.57 acres of groundwater maybe exposed within the permit area, including dewatering trenches and the settling pond. A renewal of this SWSP or a permanent augmentation plan will be needed to provide replacement water for ongoing post-mining depletions beginning June 1, 2008. The pit will remain continuously dewatered until reclamation is completed. You have provided a monthly breakdown of the post-mining annual depletions at this site in your Table 3 (copy attached). The table shows that the maximum total lagged stream depletions are conservatively estimated to be 53.83 acre-feet per year corresponding to an exposed surface area of 17.52 acres. The estimated depletions are based solely upon steady- state lagging of groundwater evaporation from the reclaimed pit, which exceed the lagged depletions estimated from mine operation consumptive uses as provided in your Table 3. As a conservative measure, you have proposed to use the post-mining depletions to determine the monthly replacement requirements (see table 1 below). Mine operation depletions will consist of evaporation of exposed groundwater, water loss in mined material, dust control, asphalt and concrete production, and sanitary uses. Total monthly depletions for each use will be limited to the totals provided in your Table 3. No groundwater will be used for any other purpose. No phreatophyte credit has been applied to this plan. The proposed source of replacement water for this pit is fully consumable water released Nusse:ll Gerorge Executive Direc[er June 23, 2006 Nat O. Simpson, pE. State EnNneer