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STATE OF COLORADO OFFICE OF THE STATE ENGINEER (~ Division of Water Resources Department of Natural Resources 1313 Sherman Street, Room 818 Denver, Colorado 80203 Phone (303) 866-3581 rnx (303) 866-3589 ECEIVED APR 12 2005 Division ~f Minerals and Geology oF'o~to ~F' 4~ r~ v, ~ + ~ t876 ~` www.wa[ecstate.co.us Michelle Matthews Tetra Tech RMC P.O. Box 1300 April 6, 2005 Falrplay, CO 80440 Re: 2004 - 2005 Baxter Road Pit, Substitute Water Supply Plan DMG File No. M-90-106 ~/ SE'/.Section 36, T20S, R64W, 60i P.M. Water Division 2, Water District 14 Expiration date: March 31, 2006 Dear Ms. Matthews: Bill Owens Governor Russell George Executive Direttor Hal D. Simpson, P.E. State Engineer We have reviewed your letters of December 17, 2003 and December 29, 2004 requesting renewal of a substitute water supply plan for a sand and gravel pit to be operated by RBK Construction (RBK). The Applicants 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 $217 for the substitute water supply plan has been paid. PLAN OPERATION This is a new pit, and no groundwater was exposed prior to January 1, 1981. However, a 3- acre pond. currently exists on the site, permit no. 57014F. The site is to be wet mined with a mining area water surface not to exceed 4.0 acres. It is anticipated that upon completion of mining, a permanent free water surface of 4.0 acres will be exposed to evaporation in the pit. A permanent augmentation plan will, therefore, be required. Mining is not anticipated for this years plan. DEPLETIONS You estimate the anticipated annual consumption to be 14.4 acre-feet of evaporative losses from 4.0 acres of exposed groundwater. The anticipated losses are summarized on a monthly basis in the attached table along with the lagged stream depletions. REPLACEMENT Replacements will be provided from a 5-year lease through March 31, 2010 of 21 acre-feet of water RBK has contracted with the Lower Arkansas Valley Water Conservancy District of Larkspur Ditch water released from storage in Pueblo Reservoir and administered by AGUA. Consumption at the pit will cause lagged depletions to the Arkansas River. Based on stream depletion modeling, it appears that 90 percent of the total consumption at the pit will be lost from the stream in the first year. RBK proposes to make full replacements to the Arkansas each year in the amount of the actual consumption at the pit.