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ARCADIS <br />event in March 2008. Subsequent to that monitoring event and further discussions with <br />the DRMS, Holcim prepared a number of revisions to the GMP, as follows: <br />• November 21, 2008 <br />• February 17, 2009 <br />• July 7, 2010 <br />1.3.2 November 21, 2008 Groundwater Monitoring Plan <br />Holcim prepared a revision to the GMP, dated November 21, 2008. The revised GMP <br />proposed the following: <br />• Installation of one new monitoring well (MW -13) located hydraulically downgradient <br />of the CKD landfill; <br />• Annual monitoring of the new well plus existing monitoring wells MW -7 and MW- <br />12; and <br />• Abandonment of monitoring wells MW -6, MW -8 and MW -10, because they were <br />no longer usable and /or they no longer served any purpose in the monitoring <br />program. <br />1.3.3 February 17, 2009 Groundwater Monitoring Plan <br />A subsequent revision to the GMP, dated February 17, 2009, proposed compliance <br />standards for downgradient monitoring well MW -7, based upon the highest historical <br />concentrations. Those are discussed in Section 3.2. The proposed revisions to the <br />GMP and the compliance standards were approved by the DRMS on February 24, <br />2009, with the condition that well MW -13 be monitored for five successive quarters to <br />establish compliance standards for that well. A copy of the February 17, 2009 GMP <br />from Holcim and the February 24 DRMS approval letter are included in Appendix A. <br />The DRMS approval letter stipulated that if two or more analytical parameters in <br />monitoring well MW -7 exceeded their respective compliance standards by more than <br />10 %, semi - annual sampling for those parameters would be required. <br />In April 2009, Holcim retained ARCADIS' to install one new groundwater monitoring <br />well (MW -13) downgradient of the quarry operations, and to abandon three <br />groundwater monitoring wells that were no longer active. Details of the field activities <br />performed as part of the groundwater monitoring well installation and abandonments <br />2013 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />4 <br />