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1 <br /> 2018 GROUNDWATER MONITORING REPORT <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 /> MWA 3 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 /> 1 <br /> 1 <br /> 4 <br />