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Red Creek Quarry, Groundwater Modeling Analysis <br /> <br /> <br />1 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the beginning of this document. <br />RedCreekQuarry_Modeling_TM_DRAFT_20230911 <br />Section 1: Introduction <br />Brown and Caldwell (BC) performed groundwater flow modeling described in this report on behalf of Holcim <br />US, Inc. (Holcim) for the Red Creek Quarry (RCQ) Portland Plant Permitting Project. This groundwater model <br />was used to support the Division of Reclamation, Mining & Safety (DRMS) permitting by estimating the rates <br />of groundwater entering the RCQ Mine Plan Operations (MPO) open pits. In addition, this groundwater model <br />was used to estimate the potential impacts to Red Creek from MPO. This report describes the methods and <br />results of the evaluation. <br />1.1 Model Objectives <br />The objectives of the modeling analysis include the following: <br />• Develop a simplistic groundwater flow model. <br />• Use the groundwater flow model to estimate rates of groundwater entering the pit in each MPO <br />phase. <br />• Use the groundwater flow model to estimate potential impacts to Red Creek from MPO. <br />1.2 Background <br />RCQ (the site) is located approximately 15-miles west of Pueblo, Colorado along Highway CO-96 and encom- <br />passes approximately 3,851 acres. The mine will consist of an open-pit limestone quarry, sandstone pits and <br />conveyor corridor to provide limestone to the Holcim Portland Plant. Figure 1 shows the RCQ site boundary, <br />Red Creek, and locations of existing groundwater monitor wells. Red Creek flows northeast through the site <br />and into the Arkansas River approximately two miles northeast of the site. The five monitor wells were in- <br />stalled in November 2021 and are screened in the Codell Sandstone. (BC, 2023) <br /> <br /> <br />