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ARCADIS <br />event in March 2008. Based upon the results of that monitoring event and further <br />discussions with the DRMS, Holcim prepared a revision to the GMP, dated November <br />21, 2008. The revised GMP 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-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 />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 April 2009 monitoring well data for MW-7 presented in Section 3 is therefore <br />compared to the background standards established in the February 2009 GMP. The <br />installation of monitoring well MW-13 is described in Section 4. <br />Final April 2009 <br />Groundwater <br />Monitoring Report <br />Florence, California <br />cAdocuments and settingslstobgy\my documents\holcim1025911978_holcimreg version_final.docx 4