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October 2012 <br />\10 \81640\ 0400\ charactenzationpin_ fnl- 23oct12 \charactenzationpin_fnl- 23oct12 docx <br />Attorney Work Product, <br />Confidential and Privileged <br />5 <br />2.0 CHARACTERIZATION SCOPE OF WORK <br />Based on our understanding of the DRMS issues, the primary questions that need to be answered to <br />ultimately achieve full release of reclamation liability are whether groundwater has been impacted by CKD <br />disposal at the site, and if it has, whether remedial actions are necessary. The following scope of work <br />(SOW) items tasks will be performed specifically to address these questions. <br />• Conduct a field investigation to include: 1) drilling and rock sampling, 2) new <br />groundwater monitoring well construction, 3) collecting samples from the new and <br />existing monitoring wells, and 4) obtaining and evaluating additional information from <br />private wells in the vicinity of the Site, if available. <br />• Summarize the field investigation activities in a brief report. <br />• Prepare a Characterization Report, after four quarters of monitoring of the new wells has <br />been performed, which defines the extent of impacted groundwater and outlines <br />proposed actions, if necessary, to minimize current and future impacts. <br />The purpose of the drilling and rock sampling is to help address the following DRMS issues: <br />• What specifically is the local geology? <br />• How does the site geology influence the groundwater quality? <br />• How might the site geology influence the migration of impacted groundwater? <br />• How does the site geology and migration of impacted groundwater relate to construction <br />of the site monitoring wells and nearest surrounding /downgradient wells? <br />• How does the current extent of impacted groundwater and site geology compare to the <br />construction of surrounding wells (i.e., what is the likelihood that other nearby wells may <br />be impacted and are they in the same aquifer)? <br />New monitoring wells will be installed and in the boreholes following drilling for purposes of sample <br />collection to help address: <br />• What is the current vertical and horizontal extent of impacted groundwater? <br />• Can it be shown the impact is confined to within the permit area? <br />• How does the site geology and migration of impacted groundwater relate to construction <br />of the site monitoring wells and nearest surrounding /downgradient wells? <br />• How does the current extent of impacted groundwater and site geology compare to the <br />construction of surrounding wells (i.e., what is the likelihood that other nearby wells may <br />be impacted and are they in the same aquifer)? <br />Gathering and evaluating private well information will help deal with: <br />• What is the current vertical and horizontal extent of impacted groundwater? <br />• Can it be shown the impact is confined to within the permit area? <br />• How does the site geology and migration of impacted groundwater relate to construction <br />of the site monitoring wells and nearest surrounding /downgradient wells? <br />103- 81640A <br />Golder <br />Associates <br />