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' and chain of custodymanifest for the most recent ent groundwater sampling event at the site is presented <br />' in Appendix B <br />' 30 RECOMMENDED REMEDIAL ACTION PLAN <br />' 31 Overview <br /> Based on the available data, approximately 1000 cubic yards of soil beneath the pump island area <br />' is impacted by benzene and TPHg The areal extent of hydrocarbons in soil appears to be restricted <br /> to the vicinity of the pump islands and west end of the former tank location <br /> 1 ' <br />' The proposed remedial alternative for this site is vapor extraction which should provide the most <br /> effective and economical remediation of soil Vapor extraction will cease after confirmation that the <br />' impacted soils will no longer pose a threat to groundwater quality <br /> Soil vapor extraction system design parameters are based on data obtained during a VET performed <br /> by Canonie (Canome, 1992) The pilot test was conducted to evaluate the concentration of <br />' hydrocarbons in the soil vapor extracted from the wells The VET indicated that the average initial <br /> hydrocarbon concentration expected from the vapor extraction wells would be approximately 12,400 <br /> ppmv (Appendix C) <br />' 32 Site Health and Safety Plan <br /> Prior to commencing the remediation phase of the project, the existing Site Health and Safety PIan <br /> (SHSP) will be revised to reflect the additional activities to be conducted on-site The revisions will <br /> be prepared in accordance with Occupational Safety and Health Administration (OSHA) guidelines <br /> Iset forth in "Hazardous Waste Operations and Emergency Response" (29 CFR 1910 120) The <br /> SHSP will be reviewed and signed by all SEACOR personnel and subcontractors performing work <br /> on-site A copy of the SHSP will be present on-site at all times and kept in an easily accessed <br /> location <br /> TGC1636 FAIL <br /> M0005-0(12-0I 26 190ti ` <br /> Ag-26 F943 <br /> I <br />