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ARCADIS Mr. Roberto Cervantes <br /> October 21, 2011 <br /> groundwater samples and monitoring well groundwater samples will be collected to <br /> assess on-site groundwater conditions and to evaluate the potential need for future <br /> investigations at the Site, i.e. soil vapor sampling. <br /> The additional assessment activities will be completed in accordance with the Site <br /> Investigation Work Plan (ARCADIS, 2010). The following activities will be completed <br /> in response to RWQCB comments on the Site Investigation Work Plan and SIR <br /> (RWQCB, 2010 and 2011): <br /> • Monitoring wells MW-5 and MW-7 will be constructed with 4-inch outer <br /> diameter schedule 40 polyvinyl chloride casing; <br /> • Monitoring well MW-6 will be constructed with 2-inch outer diameter <br /> schedule 40 polyvinyl chloride casing; <br /> • Approximately 20% of the proposed soil and groundwater samples will be <br /> analyzed for the full range of volatile organic compounds (VOCs) by USEPA <br /> Method 8260B and the full range of semivolatile organic compounds <br /> (SVOCs) by USEPA Method 8270C; <br /> • Dissolved Lead and Tetra Ethyl Lead will be analyzed in groundwater by <br /> USEPA Method 6020 and USEPA Method 8270C, respectively; and <br /> • Naphthalene will be analyzed in soil and groundwater by USEPA Method <br /> 8270C. <br /> After completing the field activities, ARCADIS will prepare a site assessment report <br /> that includes an evaluation of the soil and groundwater analytical data, preparation of <br /> tables and figures, monitoring well installation locations, and well survey. The report <br /> will also include an update of the conceptual site model developed for the SIR. <br /> Proposed Work Schedule <br /> ARCADIS will initiate the pre-field activities such as permitting and development of a <br /> Site-specific Health and Safety Plan upon RWQCB's approval of the proposed <br /> assessment activities. Soil boring, monitoring well installation, well development, <br /> and sampling will take an estimated month to complete. The technical report will be <br /> submitted approximately ten weeks following receipt of the final laboratory reports. <br /> Page: <br /> 5/7 <br /> G.9rojeclslCHEVROW401 N.San Jose SnTECHNICAURWOCBRTCIRssponss to RWQCB Comments.doc <br />