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Mr. Kevin Rein <br />Office of the State Engineer <br />Page 1 <br />It is anticipated that construction will begin in 2025, and mining will begin in 2027. <br /> Figure 1. Holcim Red Creek Quarry <br />Projected Water Usage and Depletions <br />This section describes the potential depletions to the Arkansas River in 2025 from: (1) interception of <br />natural water systems during construction and mining activities and (2) water supplies developed for <br />use at the RCQ for dust suppression and sanitary purposes. <br />Impact of mining on water resources <br />As part of the mine permitting process, BC performed a multi-year baseline investigation to document <br />and characterize the hydrologic system at the RQC quarry site to evaluate if the proposed mining opera- <br />tions will result in the interception of groundwater, and to determine what if any hydrologic connection <br />may exist between groundwater and the Red Creek perennial surface water system. The draft report <br />characterizing the potential mining impact to groundwater and surface water system is attached as At- <br />tachment A. <br /> <br />The Red Creek surface stream is a perennial stream to the Arkansas River. The water resources investi- <br />gation documented in Attachment A reports the following findings: <br />“Groundwater modeling results indicate the future open pit will have minimal impact on the groundwa- <br />ter system as the pit bottom extends into the Codell Sandstone during years 0-20. However, the <br />groundwater model indicates there will be minimal to no impact on flow within the perennial sections of <br />Red Creek. Red Creek is intermittent and has no surface flow as it moves north from the proposed RCQ <br />boundary, indicating mining operations will likely have no impact on the Arkansas River to the north of <br />the site.” <br />