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ARCADIS <br />were documented in the Final April 2009 Groundwater Monitoring Report (ARCADIS, <br />2009). <br />Following installation in April 2009, MW -13 was sampled on a quarterly basis for five <br />consecutive quarters at the request of the DRMS for the purpose of determining the <br />appropriate parameters and setting compliance standards for the well. Analytical <br />results were provided in the March 2010 Groundwater Monitoring Report (ARCADIS, <br />2010). Subsequently, MW -13 was added to the annual groundwater monitoring <br />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 <br />compliance standards for MW -13. This GMP revision can be found in Appendix B. <br />The DRMS responded with numeric protection levels (NPLs) [previously referred to as <br />compliance standards] for MW -13 in a letter dated November 27, 2012. This letter has <br />been included in Appendix A. The DRMS approval letter stipulated that in addition to <br />MW -7, if the analytical parameters exceeded their respective NPL by more than 10 %, <br />semi - annual sampling for those parameters would commence. <br />2013 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />5 <br />