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' 2019 GROUNDWATER MONITORING REPORT <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 (Arcades 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 /> ' arcadis corn <br />