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OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natural Resources 1317 Sherman Street, Room 818 Denver, Colorado 80203 Phone: (3031 866-3581 FAX: (303) 866-3589 hnp //waterstate.co.us/default.htm Mark McLean, P.E. Rocky Mountain Consultants, Inc. 825 Delaware Ave. #500 Longmont, CO 80501 ^~ .~-r n ~rr /~ COLORADO III IIIIIIIIIIIII III 999 oc cow ~~~ +~. ~ r8'!6 ~ August 30 2000 co~ ° ~'o "' , RECEIVED V , , GregE Walther Executive Director SEP 13 2000 Hal D. Simpwn. P.E. State Engineer Division of Minerals and Geology Re: Baxter Road Pit, Substitute Water Supply Plan DMG File No. M-90-106 SEY, Section 36, T20S, R64W, 6'" P.M. Water Division 2, Water District 14 Dear Mr. McLean: We have reviewed your letter of February 15, 2000 requesting a substitute water supply plan for a sand and gravel pit to be operated by RBK Construction (RBK), in accordance with 37-80-120 C.R.S. We have also reviewed your letter of July 25, 2000 in response to a request for additional information by our review contractor, Wright Water Engineers, Inc. (WWE). 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 $1,343 for the substitute water supply plan has been paid. 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. 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 projected to produce 200,000 tons of aggregate each year for 10 years during its March to December operation period. You estimate the anticipated annual consumption during the 10 years of operation to be approximately 20.3 acre-feet per year. This total includes; 14.4 acre-feet of evaporative losses from 4.0 acres of exposed groundwater and 5.9 acre-feet of water lost on 200,000 tons of wet and washed product with no water used for dust suppression. The anticipated losses are summarized on a monthly basis in the attached table. In order to initiate mining operations at this site, 2 temporary sources of replacement water are proposed. To cover the first year's depletions (through March 31, 2001), 20.4 acre-feet of fully consumable water obtained from Cherokee Metropolitan District by MAGUA will be delivered to the site. Beginning in the second year (as of April 1, 2001), replacements will be provided from a 4-year lease of 21 acre-feet of fully consumable water RBK has contracted for directly with the Board of Water Works of Pueblo. Consumption at the pit during the 2 years that this approval is in effect 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.