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2018 GROUNDWATER MONITORING REPORT <br />arcadis.com 4 <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. <br />1.3.4 July 7, 2010 Groundwater Monitoring Plan <br />On July 7, 2010, Holcim proposed another revision to the GMP, including proposed compliance standards <br />for MW-13. The revised GMP dated July 7, 2010 is provided in Appendix A. The DRMS responded with <br />NPLs for MW-13 in a letter dated November 27, 2012 (DRMS 2012, included in Appendix A). The DRMS <br />approval letter stipulated that in addition to MW-7, if the concentrations of the parameters analyzed in <br />MW-13 exceed their respective NPL by more than 10 percent, semi-annual sampling for those <br />parameters would commence. <br />1.3.5 October 17, 2014 Proposal to Remove Sodium as a Groundwater Quality <br />Parameter <br />In a letter to the DRMS dated October 17, 2014 (Arcadis 2014, Appendix B), Holcim proposed to remove <br />sodium as a groundwater quality parameter used to evaluate the potential impact from leaching of CKD <br />and bypass dust. Additionally, Holcim proposed a potassium to sodium ratio using an NPL of 0.5 to <br />replace sodium as one of the primary water quality indicators of impact from the CKD landfill. Approval <br />was received from the DRMS in a letter dated February 25, 2015 (also included in Appendix B). <br />