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1 ARCADIS <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 />1 program <br />Details of the field activities performed as part of the groundwater monitoring well <br />installation and abandonments were documented in the Final April 2009 Groundwater <br />Monitoring Report (ARCADIS, 2009). <br />1 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 />' Results of the five consecutive quarters of monitoring well data for MW -13 were <br />discussed in the March 2010 Groundwater Monitoring Report (ARCADIS, 2010). The <br />July 7, 2010 proposed GMP from Holcim, including proposed compliance standards for <br />MW -13, can be found in Appendix B. To date, Holcim has not received notice from <br />DRMS of set compliance parameters and standards for MW -13. March 2011 <br />groundwater sampling results do not exceed the compliance standards for MW -13 <br />1 proposed in the July 7, 2010 GMP. The March 2011 monitoring well data are <br />presented in Section 3. <br />1 <br />1 <br />1 <br />1 <br />1 <br />2011 Groundwater <br />Monitoring Report <br />Florence, Colorado <br />4 <br />