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®:M PEA Work Plan <br /> Martin Metals Finishing Inc. (Former) <br /> Stockton, California <br /> • Soil vapor screening levels derived using a default attenuation factor of 0.03 and the indoor <br /> ambient air screening levels from either DTSC's Commercial/Industrial Air SLs or the USEPA <br /> Industrial Air RSLs. <br /> Laboratory test methods are proposed with reporting limits will be sufficiently sensitive to compare results <br /> to required screening criteria, as documented in the QA/QC Plan in Appendix C. <br /> 3.4 Scope of Work <br /> The scope of work will consist of the major elements described below. <br /> • Permitting, utility clearance and storm drain condition assessment; <br /> • Collection of samples of accumulated sediment in the concrete drainage trench; <br /> • Collection of soil vapor samples from five subslab probes and nine vapor wells; <br /> • Collection of subsurface soil samples from up to 11 soil borings; <br /> • Collection of near-surface, shallow soil samples from five transects across Mormon Slough; <br /> • Laboratory analysis and results interpretation; and <br /> • Submittal of a PEA report summarizing findings of the investigation and a risk assessment. <br /> CDIM—Fairgrounds Industrial Park Page 9 <br />