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2014 Groundwater <br /> ARCADIS Monitoring Report <br /> Florence,Colorado <br /> Specific requirements for protection of groundwater are described in Rule 3.1.7(7)(i) <br /> through (viii) of the "Construction Material Rules and Regulations" (Mined Land <br /> Reclamation Board [MLRB] 2001) and the Colorado Department of Public Health and <br /> Environment(CDPHE), Water Quality Control Commission (WQCC) Regulation No. 41 <br /> "Basic Standards for Ground Water" (CDPHE 2008). <br /> 1.3.1 Baseline Groundwater Monitoring Program <br /> On August 16, 1999, Holcim submitted a request to the Colorado DRMS for a <br /> Technical Revision (TR-06) to its permit for the disposal of CKD in previously mined <br /> areas at the quarry (K-S & Company 1999). TR-06 included a description of CKD <br /> disposal procedures and facilities, closure plan for the disposal areas, description of <br /> erosion control measures used at the site, discussion of CKD sampling and analysis, <br /> and description of hydrogeologic conditions at the site. The DRMS, formerly the <br /> Division of Minerals and Geology(DMG), reviewed TR-06 and responded with an initial <br /> adequacy review letter on January 18, 2000 (DMG 2000). On behalf of Holcim, K-S & <br /> Company submitted responses to DMG's adequacy review letter in May 2001 (Holnam <br /> 2001). The DMG responded with a second adequacy review letter on October 22, <br /> 2002 (DMG 2002). <br /> ARCADIS was retained by Holcim to provide technical support for Mine Permit <br /> Technical Revision TR-06 (TR-06) to State of Colorado Mining Permit No. M-77-344 <br /> for the Holcim Portland Plant and quarry. In partial fulfillment of the Colorado DRMS <br /> requirements for TR-06, a Groundwater Monitoring Plan (GMP) was developed for the <br /> approximately 1,330 acres included within the boundaries of the mining permit (Figure <br /> 2) (BBL 2002). The main purpose of the GMP was to meet the requirements of the <br /> Colorado MLRB's Construction Materials Rules and Regulations Rule 3.1.7 for the <br /> protection of existing and reasonably potential future uses of the unclassified <br /> groundwater located beneath the quarry (MLRB 2001). These requirements were <br /> triggered by the disposal of CKD into previously mined sections of the site, and the <br /> potential for leachate from CKD to adversely impact ambient groundwater quality for <br /> existing and reasonably potential future uses. <br /> In 2004, all requirements from the DRMS's adequacy reviews were fulfilled with the <br /> submittal of the final quarter of data for monitoring well MW-10 (BBL 2004). The DRMS <br /> was to use the data from the groundwater monitoring program to establish ambient <br /> groundwater concentrations and a parameter list for future monitoring. Holcim was to <br /> initiate annual groundwater monitoring per the GMP once the ambient groundwater <br /> concentrations and parameter list had been established by the DRMS. <br /> 3 <br />