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i <br />1 <br />1 <br />1 <br />l <br />1 <br />1 <br />1 <br />i <br />1 <br />1 <br />1 <br />October 2012 <br />Attorney Work Product, <br />Confidential and Privileged <br />7 <br />103- 81640A <br />be used to collect continuous samples of bedrock. To the extent practical, air will be used as the drilling <br />fluid until first groundwater is encountered. Clean water from a known source will likely be used for coring <br />below the top of groundwater to help facilitate cutting removal. Prior to monitoring well installations, <br />described below, the core holes will be reamed to a 6 -inch diameter. Drilling and sampling will be <br />performed by a qualified drilling firm, under the supervision of a qualified hydrogeologist/engineer. <br />It is assumed that excess drill cuttings will be non - hazardous and can be disposed at a nearby solid waste <br />landfill. However, this disposal method may require sampling and chemical analysis of the cuttings prior <br />to disposal. If necessary, the cuttings may be temporarily stockpiled on Site pending the laboratory <br />analysis. <br />Rig Decontamination <br />Steam cleaning of the rig and appropriate downhole equipment will be performed before drilling begins, <br />between boreholes and at the completion of drilling. Water used for steam cleaning will be obtained from <br />an approved source. It has been assumed that decontamination water will not need to be collected and <br />containerized and will be discharged onto the ground surface near the drilling locations. To minimize the <br />risk of contamination, drilling /sampling equipment threads will be lubricated using hydrocarbon -free <br />products. <br />Sampling and Lithologic Logging <br />The hydrogeologist/engineer will prepare a lithologic log of each borehole as drilling progresses. In <br />addition to this geologic information, the hydrogeologist/engineer will pay close attention to the depth at <br />which groundwater is first encountered, if discrete intervals of saturation exists at various depths, and <br />changes in lithology. <br />Whole Rock Laboratory Testing <br />Rock samples will be collected from selected depths for analysis of chemistry to help determine if the <br />geology is contributing to elevated groundwater constituent concentrations. The target horizons for this <br />analysis will consist of any distinct rock types which may be in contact with groundwater as observed <br />during drilling. At least one sample per borehole will be selected. The analysis will consist of both a bulk <br />chemical analysis and the Synthetic Precipitation Leaching Procedure (SPLP) for the same constituents <br />as the groundwater monitoring program. <br />Solid -phase chemical analysis will provide the bulk chemical composition of a material in units of <br />milligrams of component per kilogram of rock (mg /kg). The results can be used to identify elevated <br />concentrations of elements that are of potential environmental concern. The SPLP analysis (US EPA <br />Method 1312) is a test where a sample is leached with a solution designed to mimic meteoric water or <br />\10\ 81640\ 0400\ characterrzationpin_ fnl- 23oct12 \charactenzationpin_fnl- 23octl2 docx <br />Golder <br />Associates <br />