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2020 GROUNDWATER MONITORING REPORT <br />arcadis.com 3 <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 />In 2004, all requirements from the DRMS’s adequacy reviews were fulfilled with the submi ttal 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 MW-13, 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 MW-13 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 a new groundwater monitoring well (MW-13) <br />downgradient of the quarry operations and to abandon three groundwater monitoring wells that were no <br />longer in 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 />Following installation in April 2009, MW-13 was sampled quarterly for five consecutive quarters at the <br />request of the DRMS to determine appropriate parameters and establish NPLs for the well. Analytical <br />results are presented in the March 2010 Groundwater Monitoring Report (Arcadis 2010). Subsequently, <br />MW-13 was added to the annual groundwater monitoring program in March 2011.