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2021 Groundwater Monitoring Report <br />www.arcadis.com <br />2021 Holcim FINAL GWMR 4 <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 for <br />MW-13. The revised GMP dated July 7, 2010 is provided in Appendix A. The DRMS responded with NPLs for <br />MW-13 in a letter dated November 27, 2012 (DRMS 2012, included in Appendix A). The DRMS approval letter <br />stipulated that in addition to MW-7, if the concentrations of the parameters analyzed in MW-13 exceed their <br />respective NPL by more than 10 percent, semi-annual sampling for those parameters would commence. <br />1.3.5 October 17, 2014 Proposal to Remove Sodium as a Groundwater <br />Quality Parameter <br />In a letter to the DRMS dated October 17, 2014 (Arcadis 2014, Appendix B), Holcim proposed to remove sodium <br />as a groundwater quality parameter used to evaluate the potential impact from leaching of CKD and bypass dust. <br />Additionally, Holcim proposed a potassium to sodium ratio using an NPL of 0.5 to replace sodium as one of the <br />primary water quality indicators of impact from the CKD landfill. Approval was received from the DRMS in a letter <br />dated February 25, 2015 (also included in Appendix B). <br />