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A'(~C OFFICE OF THE STATE ENGINEER Division of Water Resources Department of Natural Resources 1313 Sherman Slreet, Room 818 Denver, Colorado 80203 Phone (303)866-3581 FAX (303)866-3589 http:l:www watecstate.c°.us Cheryl Signs, P.E. ~!` v Cheryl Signs Engineerin 109 East Fourth Avenue Denver, CO 80203 ,y/ ~~ STATE OF COL~OIZADO May 31, 2007 RECEIVED t~UN 0 8 20U'1 Division of reclamation, Mining and Safety ~/ / RE; Substitute Water SupaN Pian. Barlow Pit, DRMS No. M-74-092 SE'/., SW'/., Section 33, T4N, R57W, 6th P.M. Batch Plant Well No, 2104-F: NW'h, NE Y., Section 5, T3N, R57W, 6th P.M. Water Division 1, Water District 1, Morgan County ~'~~a /e/ t ~> ~ile/ . --~ jf, 8111 Ritter, Jr. G°vemor Hams D. Sherman Executive Director Nat D. Simpson, P E. Stale Engineer Approval Period: June 1, 2007 through May 31, 2008 or May 31, 2009 (subject fo condition no. 1) Contact Phone Number for Ms. Cheryl Signs: 303-778-7653 Dear Ms. Signs: We have reviewed your letter of April 13, 2007, requesting renewal of the above referenced substitute water supply plan to cover depletions for sand and gravel mining operation at the Barlow Pit site. In the previous plan, the applicant indicated that the company was in the process of filing an application for a plan for augmentation with the Division 1 Water Court; however, you have indicated that the company has reevaluated its plan and decided not to file a water court application at this time. This plan also includes well permit no. 2104-F, which is used at the Barlow Pit batch plant, which is located less than one mile east of the Barlow Pit. The required fee of $257 for the renewal of this substitute supply plan has been submitted. The original supply plan was approved on January 13, 1992 and it was most recently approved on August 12, 2005. DEPLETIONS 8 CREDITS Currently there are 11.4 acres of exposed ground water at the Barlow Pit site. This plan anticipates a total of 35.75 acres of water surface will be exposed at the site in the future. Accordingly, this plan proposes to make replacements of depletions from evaporation from 35.75 acres of exposed ground water. Based on current assumptions to be described herein, the anticipated net depletions on an yearly basis are 44.66 acre-feet, which consists of 34.42 acre-feet per year of evaporation from up to 35.75 acres of ground water exposed after December 31, 1980, 2.94 acre-feet per year of water lost in 100,000 tons of mined product and 7.31 acre-feet per year for operation of the batch plant well, permit no. 2104-F. The total lagged depletions are 44.73 acre-feet which is reflected in the attached Table 1. As in the previous approval of August 12, 2005, 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 were lagged from the pit site using the AWAS program developed by the IDS Group at Colorado State University. A transmissivity of 300,000 gallons per day per foot was used and a specific yield of 0.2 was used.