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DEPARTMENT OF NATURAL RESOURCES <br /> DIVISION OF WATER RESOURCES <br /> John W.Hickenlooper <br /> 1 g 7 G / Governor <br /> Mike King <br /> January 20, 2016 Executive Director <br /> RE <br /> a�� Dick Wolfe P.E. <br /> (� Director/State <br /> te Engineer <br /> Mr. Craig Lis <br /> Martin and Wood Water Consultants, Inc. JAN 20 2Q16 <br /> 538 Commons Drive <br /> Golden, CO 80401 DIVISION OF RECLAMATION <br /> MINING&SAFETY <br /> Re: w GSL Sand and Gravel Substitute Water Supply Plan (WDID 0202584) <br /> (a.k.a. 120th Estates Partners Sand and Gravel Mine and 1241h Estates Pit) <br /> GSL Sand and Gravel Mine, DRMS Permit No. M-2001-085 (WDID 0203018) <br /> Section 35, T1S, R67W, 6th P.M. <br /> Water Division 1, Water District 2, Adams County <br /> Approval Period: November 1, 2015 through October 31, 2017 <br /> Contact phone number for Mr. Craig Lis: 303-526-2600 <br /> Dear Mr. Lis: <br /> We have reviewed your letter dated October 13, 2015 requesting renewal of the above-referenced <br /> substitute water supply plan ("SWSP") to cover depletions caused by the GSL Sand and Gravel mine in <br /> accordance with 5 37-90-137(11), C.R.S. The original plan was approved on May 20, 2002, and its <br /> renewal was most recently approved in a letter dated February 20, 2014. The required fee of $257 <br /> for this renewal of the SWSP has been submitted (receipt number 3671951). <br /> Plan Operation <br /> This SWSP covers depletions caused by sand and gravel mining operations at the GSL Sand and Gravel <br /> Mine ("Applicant"). Mining operations ceased in November 2011 and the pit filled, creating a 26.70- <br /> acre pond. The Applicant is in the process of backfilling the pond and the currently exposed ground <br /> water surface area is 16.05 acres. A slurry wall was installed around the pond however the liner is <br /> not functional. <br /> Depletions <br /> The depletions that result from the past mining operation at the site consist of evaporation from <br /> exposed surface area, water used for dust suppression, water removed in the mined product and <br /> depletions from dewatering and the filling of the pit once dewatering ceased. Other than <br /> evaporation from the exposed ground water surface, no new depletions will occur during this SWSP <br /> approval period. All historic water use remains in the lagging analysis in order to account for any <br /> depletion still impacting the river. <br /> Prior to November 2011, the total exposed surface area at this site was one acre. Starting in <br /> November 2011, the operator allowed the pit to fill as mining operations were complete. The <br /> Applicant had estimated that the pit would fill with ground water to an equilibrium state within <br /> three months. The pit filled to create an exposed ground water surface area of 26.7 acres by <br /> February 2012. Beginning in November 2014 the Applicant began backfilling the pond which reduced <br /> Office of the State Engineer <br /> 1313 Sherman Street, Suite 818•Denver, CO 80203•Phone:303-866-3581 •Fax:303-866-3589 <br /> www.water.state.co.us <br /> "1 <br />