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Christy Woodward <br />September 17, 2008 <br />Page 6 <br />Issue 5 <br />The potential for the DRAs to affect groundwater quality will be largely evaluated in a <br />separate work plan that addresses geochemical characteristics of the rock stored in the <br />facilities. However, this work plan includes evaluation of hydrogeological characteristics of <br />rock units in the area of the DRAs through logging of planned exploration drill holes. As the <br />exploration drill holes are installed, the hydrogeological characteristics of the rocks will be <br />logged and the presence of groundwater will be identified where possible. The information <br />collected in-this program will be incorporated into evaluation of the site hv_ drogeological <br />framework. <br />Data Collection Procedures <br />This section discusses groundwater well installation, the number of samples, proposed to be <br />collected, locations, sampling and analysis methods, and the basis for using a particular <br />analysis method. This section is organized as follows: <br />¦ Sampling Locations and Analyses: Provides rationale for well installation and sampling <br />locations and laboratory analytical methods to be used to characterize groundwater; <br />¦ Field Activities, Methods, and Procedures: Discusses the well installation and sampling <br />procedures and equipment required. <br />Table 1 is a summary of well installation and data collection activities and Table 2 identifies <br />the laboratory analytical methods; sample containers, preservation requirements, holding <br />times, and reporting limits. Energy Laboratories, Inc. (Energy) will be the primary analytical <br />laboratory used foi"this project, with the exception of"tritium analysis. Tritium analyses will <br />be performed by Geochron Laboratories. This data collection work plan was developed in <br />coordination with Energy and Geochron regarding available and appropriate analytical <br />methods and other'laboratoMT-specific information. <br />Sampling Locations and Analyses <br />Sampling locations and analyses for groundwater are planned for the Sunday Mines Group in <br />order to achie%,e the objectives of the hydrogeologic evaluation. Groundwater will be sampled <br />within five monitoring wells. 'rhe following section describes the location, extent, and <br />rationale for well installation and groundwater sampling. <br />Groundwater Monitoring Well Installation <br />The planned monitoring wells will be installed in the underground workings in order to <br />facilitate groundwater sampling in close proximity to the mine, provide representative <br />samples, and minimize surface disturbance. The monitoring wells will be installed in sub- <br />horizontal underground boreholes using a ring drill or jack leg drill at a maximum drill <br />length of 100 feet. Each well will be drilled at an angle of approximately -20 degrees from