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2010 Groundwater <br />ARCADIS Monitoring Report <br />Florence, Colorado <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-12 <br />• abandonment of monitoring wells MW-6, MW-8 and MW-10, because they were no <br />longer usable and/or they no longer served any purpose in the monitoring 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 />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 March 2010 monitoring well data are presented in Section 3. The five consecutive <br />quarters of monitoring well data for MW-13 are presented in Section 4. Holcim <br />anticipates that the DRIVIS will set compliance standards for MW-13 based on the five <br />consecutive quarters of sampling data. <br />6- <br />GACOMMON25510\10 Final Reports and PresentetionsWanuh 2010\Te d\Holdre March 2010 Final GW Monitoring.d- 4