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Geosyntec <br /> consultants <br /> Immediately prior to advancing the MIP the detectors will be calibrated using preparedared <br /> standards of toluene to estimate detector response relative to known concentrations <br /> (Geoprobe SOP No. MK3010, included as Appendix A). It should be noted that the <br /> MIP results will not directly yield concentration values; however, the MIP results can <br /> be used to quantify relative concentrations and thereby provide valuable information on <br /> the relative distribution of VOCs within the investigation area. If significant MIP <br /> response is detected near the 40 ft total depth, the MIP will be advanced deeper, if <br /> practicable until a baseline response is observed. <br /> Data from the MIP borings will be used to assess the relative distribution of toluene in <br /> soil and groundwater in the vicinity where .elevated toluene concentrations were <br /> previously reported. <br /> 2.2.4 Groundwater Sampling <br /> After completing the CPT and MIP investigations, up to two groundwater samples will <br /> be collected from borings immediately adjacent to each CPT and five of the six MIP <br /> locations. Samples will be collected by advancing hollow CPT rods equipped with a <br /> disposable tip and filter screen to the desired sample depth interval and then retracting <br /> j the rods approximately 2 to 4 feet to expose the screen. Samples will be collected using <br /> a stainless steel bailer. All sampling equipment will be decontaminated before <br /> sampling at each location. <br /> Groundwater samples will be collected into laboratory-supplied sample containers and <br /> labeled with project identification, sample location, analytical parameters, time and date <br /> of sampling, and sample preservative, if any. Groundwater samples will be stored in an <br /> ice-cooled chest, maintained at approximately 4°C, for'transport under standard chain- <br /> of-custody procedures to Curtis & Tompkins Laboratories, of Berkeley, California. <br /> Each groundwater sample will be analyzed for toluene by EPA Method 8260B. <br /> 2.2.5 - Quality Assurance/Quality Control <br /> During this investigation the following quality assurance/quality control (QA/QC) <br /> samples will be collected: <br /> • Duplicate samples will be collected at a rate of 10% and blindly submitted to <br /> i <br /> Curtis& Tompkins; <br /> I <br /> Final Work Plan.doe 8 27 June 2012 <br /> i <br /> i <br />