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ll~~ t/ STATE OF 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 FAX (303) 866-3589 http l/www.waterstate,co.us March 14, 2007 RECEIVED Ms. Michelle Cunico Johnson / V MAR ,~ 5 Z~I Ms. Carrie Spritzer s/ Martin and Wood Water Consultants, Inc. 602 Park Point Drive, Suite 275 u~• ~~I; of Reclamation, Golden, CO 80401 !// Mining and Sai ty Re: Substitute Water Supply Plan, 124`h Estates Partners Sand and Gravel Mine Section 35, T1 S, R67W, 6th P.M. - DMG # M-2001-085 ,/ Water Division 1, Water District 2, Adams County Approval Period: January 1, 2007 through April 30, 2007 (July 31, 2008 if extended) Contact phone number for Ms. Michelle Cunico Johnson: 303-526-2600, Dear Ms. Johnson and Ms. Spritzer: yF``~~°> ~~ ~g~ s L..u~°~+F r /9 Tfi Bill Ritter, Jr. Governor Harris D. Sherman Executive Director Hal D. Simpson, P.E. Stafe Engineer We have received your letter of December 15, 2006, requesting renewal and amendment ofthe above referenced substitute water supply plan to cover depletions caused by an existing gravel mining operation. The required fee of $257.00 for the renewal of this substitute supply plan has been submitted (receipt no. 3611809). The original supply plan was approved orj September 27, 2004 and the plan was most recently renewed on June 1, 2006. Plan Operation The mining plan includes a slurry wall around the perimeter of thle site during mining. The slurry wall has been completed, however, recent tests have indicated that there is a leak in the liner. 120`h Estates Partners is currently working to fix the slurry wall and anticipates that the slurry wall liner will be fixed and approved prior April 30, 2007. II All mining will be accomplished using a dry mining method. The plan includes a rinse water lagoon and dewatering pond contained within the slurry wall with a combined exposed surface area of 2 acres. Other consumptive uses at the site include dust control and water removed in product. ~ Water pumped from the dewatering pond will be discharged intolthe Henderson Water Ski Lake ("Ski Lake"), a reclaimed and unlined gravel pit. Evaporative losses from the Ski Lake are augmented under division 1 Water Court case no. 82CW393. According to the plan and based on site observations of the Ski Lake, no significant increase in evaporation will occur from the lake as a result of discharging water to the Ski Lake.