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<br /> <br /> <br />1-1 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this docu ment. <br />Section 1 <br />Introduction <br />Holcim (US) Inc., retained Brown and Caldwell (BC) to collect surface water and groundwater data as <br />part of the Red Creek Quarry (RCQ) Baseline Water Investigation. The baseline monitoring was <br />performed to support the Colorado Department of Reclamation, Mining, and Safety (DRMS) Regular <br />Operations (112) Reclamation Permit amendment to the Bear Creek mine permit (M-1977-344). <br />The Mineral Rules and Regulations of the CO Mined Land Reclamation Board for the Extraction of <br />Construction Materials (Effective July 15, 2019), define “ambient groundwater quality” in Rule 1: <br />1.1(5) as “the quality of groundwater at the time of submittal of the permit application. In <br />establishing ambient groundwater quality, an Operator or Applicant shall use available or collected <br />groundwater data sufficient to characterize the site's ambient groundwater quality and submit such <br />information in a form suitable to the Office.” When the potential exists for a mining operation to not <br />meet CO Water Quality Control Division water quality standards, it is the responsibility of the <br />applicant to establish baseline water quality conditions. Characterizing baseline water quality and <br />quantity establishes a set of data that will be used to compare water monitoring data obtained <br />during the life of the mine. <br />This report summarizes the surface and groundwater monitoring activities conducted as part of the <br />DRMS permit application. Additional water studies including the surface water jurisdictional <br />determination, the Red Creek Quarry Baseline Sampling and Analysis Plan and groundwater <br />modeling technical memoranda appended to Exhibit G of the DRMS permit, are referenced in this <br />document as follows: <br />• Appendix 3.2 <br />− BC, 2021. U.S. Army Corp of Engineers Preliminary Jurisdictional Determination (PJD) for <br />Holcim Clevenger Ranch Property and Red Creek submitted on behalf of Holcim (US) Inc., <br />January 8, 2021. <br />• Appendix 3.6. <br />− BC. 2023a. Bear Creek Quarry (M-1977-344) Permit Amendment: Red Creek Quarry <br />Baseline Surface Water and Groundwater Sampling and Analysis Plan, prepared for Holcim <br />(US) Inc. August XX. <br />• Appendix 3.7 <br />− BC, 2023b. Red Creek Quarry Groundwater Modeling Analysis. Technical Memorandum <br />prepared for Holcim (US) Inc. August 10. <br />The remainder of the document is organized as follows: <br />• Section 2 describes the major land features of the site that influence water quality. <br />• Section 3 describes the field activities and methods for data collection. <br />• Section 4 describes the water quality data collection and quality control/quality assurance <br />program. <br />• Section 5 presents the results of the surface water and groundwater quality analyses and the <br />hydrologic assessment of the site.