2014-07-11_HYDROLOGY - M1977344 - Laserfiche WebLink

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2014 Groundwater ARCADIS Monitoring Report Florence, Colorado The DRMS responded to the BBL 2004 report as part of a December 2007 site inspection. As a result of that site inspection, Holcim performed a site-wide monitoring event in March 2008. Subsequent to that monitoring event and further discussions with the DRMS, Holcim prepared a number of revisions to the GMP, as follows: • November 21, 2008 • February 17, 2009 • July 7, 2010 1.3.2 November 21,2008 Groundwater Monitoring Plan Holcim prepared a revision to the GMP, dated November 21, 2008. The revised GMP proposed the following: • Installation of one new monitoring well (MW-13) located hydraulically downgradient of the CKD disposal area; • Annual monitoring of the new well plus existing monitoring wells MW-7 and MW- 12; and • Abandonment of monitoring wells MW-6, MW-8 and MW-10, because they were no longer usable and/or they no longer served any purpose in the monitoring program. 1.3.3 February 17,2009 Groundwater Monitoring Plan A subsequent revision to the GMP, dated February 17, 2009, proposed compliance standards for downgradient monitoring well MW-7, based upon the highest historical analyte concentrations. Those are discussed in Section 3.2. The proposed revisions to the GMP and the compliance standards were approved by the DRMS on February 24, 2009, with the condition that well MW-13 be monitored for five successive quarters to establish compliance standards for that well. A copy of the February 17, 2009 GMP from Holcim and the February 24, 2009 DRMS approval letter are included in Appendix A. The DRMS approval letter stipulated that if two or more analytical parameters in monitoring well MW-7 exceeded their respective compliance standards by more than 10%, semi-annual sampling for those parameters would be required. In April 2009, Holcim retained ARCADIS' to install one new groundwater monitoring well (MW-13) downgradient of the quarry operations, and to abandon three 4