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COLORADO <br /> C& 0 Division of Water Resources <br /> Department of Natural ResOUTCe.S <br /> October 19, 2021 <br /> Craig M. Lis, Principal Engineer <br /> Martin and Wood Water Consultants, Inc. <br /> 538 Commons Drive <br /> Golden, CO 80401 <br /> Re: GSL Sand and Gravel Substitute Water Supply Plan (WDID 0202584) <br /> (a.k.a. 120' Estates Partners Sand and Gravel Mine and 124' Estates Pit) <br /> GSL Sand and Gravel Mine, DRMS Permit No. M-2001-085 (WDID 0203018) <br /> Section 35, T1S, R67W, 6tn P.M. <br /> Water Division 1, Water District 2, Adams County <br /> SWSP ID: 4558 <br /> Approval Period: November 1, 2021 through October 31, 2022 <br /> Contact information for Mr. Craig Lis: 303-526-2600 and clis@mortinandwood.com <br /> Dear Craig M. Lis: <br /> We have reviewed your letter dated September 15, 2021 requesting renewal of the above- <br /> referenced substitute water supply plan ("SWSP") to cover depletions caused by the GSL Sand and <br /> Gravel mine in accordance with section 37-90-137(11), C.R.S. The original plan was approved on <br /> May 20, 2002, and its renewal was most recently approved in a letter dated April 5, 2021. That plan <br /> was valid through October 31, 2021. The required fee of$257 for this renewal of the SWSP has been <br /> submitted (receipt number 10015416). <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 were completed in November 2011 and the pit filled, creating <br /> a 26.70-acre pond. A slurry wall was installed around the pond however the liner is not functional, <br /> therefore the Applicant requested an amendment to the mining permit to the Division of <br /> Reclamation Mining and Safety ("DRMS") to allow for backfilling of the pit. Since February 2012 <br /> when the exposed surface area was 26.7 acres, the Applicant was working on backfilling the pond <br /> and currently the exposed groundwater surface area as of September 2020 is 0.90 acres. <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 groundwater 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 1 acre. Starting in November <br /> 2011, the operator allowed the pit to fill as mining operations were complete. The Applicant had <br /> estimated that the pit would fill with groundwater to an equilibrium state within three months. The <br /> pit filled to create an exposed groundwater surface area of 26.7 acres by February 2012. Beginning <br /> 1313 Sherman Street, IRoom 821, Denver, CO 80203 P 303.866.3581 www.coloi,ado.gov/way.e <br /> Jared S. PoU„, Governor I Dan G;iblbT , I xecu'tive Director I IKevin G. Reiin„ Rate I in.ghnee /1DhrecLo- <br />