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August 2013 1 103- 81640A <br />1.0 INTRODUCTION <br />Golder Associates Inc. (Golder) is pleased to submit this report to Holcim (US) Inc. (Holcim) summarizing <br />the drilling, well installation, and hydraulic testing field investigation performed as part of the Groundwater <br />Characterization and Monitoring Well Installation activities at the Boettcher Limestone Quarry in Laporte, <br />Colorado (Site). This work was requested by the Colorado Division of Reclamation, Mining and Safety <br />(DRMS) in their June 25, 2012 letter to Michael Toelle of Holcim (DRMS 2012), and is described in the <br />October 23, 2012 Groundwater Characterization Plan (Golder, 2012) and subsequent modifications <br />approved by DRMS. <br />The Boettcher Quarry is a former limestone mining and cement production facility. During production, <br />cement kiln dust (CKD) was generated and disposed in mined -out portions of the Boettcher Quarry <br />(Holnam 2002; Holcim 2004, 2005, 2006, 2007, and 2009). Operations ceased in 2002, and reclamation <br />was subsequently achieved. However, groundwater monitoring and site characterization activities <br />continue to present day because testing of the CKD indicates that metals may be present in a leachable <br />state. <br />As a condition of Permit M -77 -348, groundwater monitoring was implemented in 1999 to evaluate if <br />metals were being leached to groundwater downgradient of CKD disposal area A2 (Figure 1). Four <br />monitoring wells, MW -1 through MW -4 (Figure 1) were installed and sampled in 1999, 2000 and 2010 to <br />the present as part of this work. This report describes the recent field work conducted to further <br />characterize rock and groundwater at the Site to evaluate an appropriate path forward for the full release <br />of reclamation liability. <br />i \10 \81640a\ 0400 \gwcharwellinstallfield rep_09aug 13 \gwcharwellinstal Ifieldrep_09aug 13 docx <br />9�OGolder <br />Associates <br />