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2018 GROUNDWATER MONITORING REPORT <br /> Holcim retained Arcadis to provide technical support for TR-06. In partial fulfilment of the DRMS <br /> requirements for TR-06, a GMP (BBL 2002)was developed for the approximately 1,330 acres included <br /> ' within the boundaries of the mining permit(Figure 2). The main purpose of the GMP was to meet the <br /> requirements of the MLRB's Construction Materials Rules and Regulations Rule 3.1.7 for the protection of <br /> existing and reasonably potential future uses of the unclassified groundwater located beneath the quarry <br /> ' (MLRB 2001). These requirements were triggered by the disposal of CKD into previously mined sections <br /> of the site and the potential for leachate from CKD to adversely impact ambient groundwater quality for <br /> existing and reasonably potential future uses. <br /> 1 In 2004, all requirements from the DRMS's adequacy reviews were fulfilled with the submittal of the final <br /> quarter of data for monitoring well MW-10(BBL 2004). The data from the groundwater monitoring <br /> program was provided to the DRMS for use in establishing ambient groundwater concentrations and a <br /> parameter list for future monitoring. Holcim was to initiate annual groundwater monitoring per the GMP <br /> (BBL 2002)once the ambient groundwater concentrations and parameter list were established by the <br /> DRMS. <br /> The DRMS responded to the BBL (2004) report as part of a December 2007 site inspection.As a result of <br /> the site inspection, Holcim performed a site-wide monitoring event in March 2008. Subsequent to that <br /> monitoring event and based on further discussions with the DRMS, Holcim prepared several revisions to <br /> the GMP (BBL 2002),which are discussed in Sections 1.3.2 through 1.3.5. <br /> 1.3.2 November 21, 2008 Groundwater Monitoring Plan <br /> A revised GMP, dated November 21, 2008(Holcim 2008), proposed the following activities: <br /> ' Install one new monitoring well (MW-13) located hydraulically downgradient of the CKD disposal <br /> area. <br /> • Perform annual monitoring of new monitoring well MWA 3, plus existing monitoring wells MW-7 and <br /> MW-12. <br /> • Abandon monitoring wells MW-6, MW-8, and MW-10,which were no longer usable and/or no longer <br /> serve any purpose in the monitoring program. <br /> 1.3.3 February 17, 2009 Groundwater Monitoring Plan <br /> A revised GMP, dated February 17, 2009(Holcim 2009, and Appendix A), proposed numeric protection <br /> levels(NPLs)for downgradient monitoring well MW-7, based upon the highest historical analyte <br /> concentrations (see Section 3.2). The revised GMP (Appendix A)and the NPLs were approved by the <br /> DRMS on February 24, 2009 (DRMS 2009,Appendix A),with the condition that well MWA 3 be monitored <br /> for five successive quarters to establish NPLs for that well. The DRMS approval letter stipulated that if two <br /> or more analytical parameters in monitoring well MW-7 exceed their respective compliance standards by <br /> ' more than 10 percent, semi-annual sampling for those parameters would be required. <br /> In April 2009, Holcim retained Arcadis to install new groundwater monitoring well (MW-13)downgradient <br /> ' of the quarry operations and to abandon three groundwater monitoring wells that were no longer in <br /> service. The field activities performed as part of the groundwater monitoring well installation and <br /> abandonments are discussed in the Final April 2009 Groundwater Monitoring Report(Arcadis 2009). <br />