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Applegate ~ Group, ~~~. April 5, 2001 Mr. Kevin Rein, PE State Engineer's Office 1313 Sherman Street, Room 818 Denver, CO 80203 RE: Application for Substitute Supply Plan for the Mann Lake Pit, M-82-147 Dear Mr. Rein: The purpose of this letter is to request approval of a substitute water supply plan pursuant to Section 37-80-120 (2) C.R.S. on behalf of Western Mobile, Inc., a subsidiary of Lafarge Corporation (Lafarge), for tl~e Mann Lake sand and gravel mining operation. A check made out to the Division of Water Resources for $1343.00 for the gravel pit substitute supply plan review is attached to this letter. A gravel pit well permit and the $60.00 fee will be submitted in a separate letter and should be received soon after this plan. PROJECT DESCRIPTION The Mann Lake Pit is located in Commerce City in Adams County near the intersection of County RD 3l and East 120a' Avenue. The east boundary of the site runs near the South Platte River. The site is located in Section 34 and the SE'/, of We SE % ofSection 33, Township 1 South, Range 67 West, 6'" P.M. Figure 1 is a vicinity map of the subject site. The site will be dry mined, afid groundwater will be exposed in 2 dewatering trenches, a wash pond, settling ponds, and an existing pond. The site will be mined for approximately five more years. After reclamation, the site will be a lined lake. The applicant will make replaicements for the mining depletions from a nontributary Arapahoe Aquifer well owned by the applicant. The amount of water pumped by this well will adequately account for the consumptive uses associated with the mining operation. PROJECTED CONSUMPTIVE USE W ater use at the site will include evaporation from exposed groundwater, dust control of haul roads, and water retained in material removed from the site. 1499 West 120th Avenue, Suite 200 vrww.applegategroup.com 5441 Boeing Drive, Suile 200 Denver, Colorado 80234-2728 Loveland, Colorado 80538-5855