2018-12-26_REVISION - M2008078 (27)

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Hendrix Wai: Engineering, Inca. Water Resources, Water Rights and GIS/Computer Modeling P.O.Box 4487 Telephone: (720)930-4360 Parker,CO 80134 E-Mail: Randy@Hendrix-Wai.com March 15, 2018 Melissa van der Poel, Team Leader, Division 2 Colorado Division of Water Resources 1313 Sherman Street, Suite 821 Denver, Colorado 80203 Subject: GP Aggregates' West Farm Pit Substitute Water Supply Plan, DRMS-M-2008-078, Sections 33 & 28, T22S, R46W, 6th P.M., Division 2, Water District 67, SWSP ID No. 5919, WDID 6707869 Renewal Request Dear Ms. van der Poel: Pursuant to C.R.S. § 37-90-137(11), GP Aggregates, LLC (GP) request renewal of the West Farm Pit Substitute Water Supply Plan (DRMS-M-2008-78)to continue mining of aggregate at a site located in parts of the S 'h of the SE % of Section 28 and the NE % and the NW % of Section 33, Township 22 South, Range 46 West, in the 6th P.M., Prowers County, Colorado on land called the West Farm. The proposed mining site is located approximately '/2 mile east of the Town of Lamar. Figure 1 shows the location of the gravel mine site. Enclosed is a check for $257.00 for the filing fee for the DRMS-M-2008-78 renewal request. The most recent approval of this plan was August 20, 2012 for the period of May 1, 2012 through April 30, 2013. All depletions from the mining operations including evaporative losses from the dewatering trench, settling pond, moisture content, dust control and product washing have been fully replaced within LAWMA's augmentation plan originally decreed in Water Court Case No. 02CW181. This request clarifies what depletions are augmented by which plan. The evaporative losses from the dewatering trench, settling pond and moisture content will be augmented under this plan while dust control and aggregate washing will be augmented within LAWMA's augmentation plan. Approval of this plan is sought for the period of May 1, 2018 through April 30, 2019. Project Description Evaporative Losses associated with Mining at the Pit GP operates a dry-mining gravel pit. Dry-mining involves the installation of an impermeable layer that prevents groundwater from entering the mining pit. GP has followed the State Engineer's Lining Criteria and has received approval of the liner for the West Farm Pit from the Division Engineer's Office. Dewatering trenches are installed and used throughout the mining site. The maximum length of the dewatering trenches will occur when the second phase of mining is completed and before any reclamation has begun. The maximum size of the dewatering trench will be 4,350 feet long and five feet wide. This equates to 0.5 of an acre in total size (4,350 ft x 5 ft /