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16 SITE CONCEPTUAL MODEL AND REMEDIAL ACTION PLAN 11 <br /> 7-Eleven Store No 14117,2725 Country Club Blvd , Stockton, CA June 20,2002 <br /> ' For cost-comparison purposes, a life-cycle to closure of 2 years was assumed <br /> 62 Progress Monitoring <br /> ' During each field event, extracted groundwater volume, vapor concentrations, and flowrates will be <br /> monitored At the beginning and end of each field day a grab groundwater sample will be collected from <br /> ' well MW-2 using dedicated disposable bailers for analysis for BTEX, TPH-G, and oxygenates by EPA <br /> Method 8015/8020 and 8260 On a monthly basis, samples from well MW-2 and wells MWA, MW-4, <br /> MW-3, and MW-5 will be analyzed by SM9215 for HPC <br /> Dissolved oxygenate/hydrocarbon concentrations in the groundwater monitoring wells will be monitored <br /> quarterly during remediation, and semiannually after cleanup has been discontinued Groundwater <br /> samples will be analyzed by EPA Method 8015160218020 for dissolved TPH-G and volatile organic <br /> (petroleum) constituents, and by EPA Method 8260 for MTBE and other oxygenates <br /> 63 Permitting/Reporting <br /> ' Installation and any required air discharge permits will be obtained prior to treatment initiation Work <br /> performed at the site during remediation is under the jurisdiction of the Occupational Safety and Health <br /> Administration (state and federal) <br /> Quarterly reporting of groundwater monitoring and remediation results Is assumed, until transition to <br /> ' semiannual post-remediation groundwater monitoring <br /> 64 Health and Safety <br /> ' The existing site-specific health and safety plan will be updated to reflect changes In the proposed scope <br /> of work as required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous <br /> ' Waste Operations and Emergency Response" guidelines (29 CFR 1910 120) All Shaw Environmental & <br /> Infrastructure and subcontractor personnel are required to review and sign the safety plan during onsite <br /> ' activities <br /> The health and safety plan is to be kept onsite during all onsite activities, and will be furnished to <br /> ' appropriate regulatory agencies if requested <br /> 14117Scm2 doc <br />