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STATE OF COLORADO OFFICE OF THE STATE ENGINEER Division of water Resources Department of Natural Resources 1313 Sherman SVeet, Room 878 Denver, Colorado 80203 Phone (303) 866-3587 FAX (303) 866-3584 wwwwatecstate.co.us RECEIVED / April 5, 2004 ppR 0.9 2004 f Mr. Douglas Dowlin Dlvlelan o1 Minerals & GeoloAY Dorn Ready Mix P. O. Box 636 p Ft. Morgan, CO 80701 ~ ~ f RE: Substitute Water Su I Pla Barlow Pit, M-74-092 SE'/<, SW <, ec ion 33, T4N, R57W, 6th P.M. Batch Plant Well No. 2104-F: NW Y<, NE'/<, Section 5, Water Division 1, Water District 1, Morgan Countyl/ Dear Mr. Dowling: QF.Cp~ q0 A «e • t876 ~ Bill Owens Governor Russell George Executive DimcYOr Hal D. Simpson, P.E. - SUte Engineer ~~~ ~M' T3N, R57W, 6th P.M. W e have reviewed your letter of April 24, 2003, requesting renewal of the above referenced substitute water supply plan to cover depletions for a sand and grave! mining operation at the Barlow Pit site. With the renewal request, you asked that the plan also cover well permit no.2104-F, which is used at your batch plant. Replacements for depletions associated with operation of this well were previously covered by GASP. The required fee of $217.00 for the renewal of this substitute supply plan has been submitted. The original supply plan was approved on January 13, 1992 and the latest amendment was approved May 17, 2002. The last plan expired on October 31, 2002. DEPLETIONS & CREDITS On an annual basis, based on current assumptions to be described herein, the anticipated net depletion for the plan year of June 1, 2003 through May 31, 2004 is 12.5 acre-feet, which consists of 8.3 acre-feet of lagged depletions from pastwet-mining production (no gravel mining during the period of this plan) and 4.2 acre-feet of lagged batch plant well pumping depletions. Since this plan covers depletions from the expiration date of the prior plan, total depletions requiring replacement from November 1, 2002 through May 31, 2004 are 20.06 acre-feet which also includes evaporation from up to 9.3 acres of ground water exposed after December 31, 1980. Pit site depletions were calculated using an adjusted gross annual evaporation of 45.3 inches from the exposed water surface during non-snow-cover periods and water lost in the mined product at 4% of production, with credits of 7.2 inches for effective precipitation and 27.6 inches for pre-existing sub- irrigated alfalfa. The monthly depletions to the South Platte River from the pit site depletions were calculated using a Stream Depletion Factor (SDF) of 30 days. Since the pit was mined and enough material stockpiled in 2002 such that no mining is expected through the remainder of this plan period (through May 2004), the water lost with the product is estimated to be 0 acre-feet for all of 2003 and through May 31, 2004; however, the delayed impacts to the stream from prior mining (calculated from 1995 to present) enter into current replacement obligations.