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r <br /> May 4, 1993 =:::-jjXrMA <br /> Working To Restore Nature <br /> Unocal Station No 6981, Stockton, California <br /> The vapor samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) <br /> and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) We will use the <br /> i information from the source test to apply for a Permit to Operate from the SJVUAPCD <br /> After the Permit to Operate is received, a RESNA technician will start-up the VES and <br /> collect effluent vapor samples from the operating VES for laboratory analyses weekly for <br /> the first month, and perform system checks and sample once every month following The <br /> i <br /> system check will include measuring the air flow rates from each extraction well and the <br /> total flow rate from the system <br /> i The vapor samples will be collected by pumping the vapors with a 0 25 horsepower electric <br /> air pump into 1-liter tedlar sampling bags RESNA will initiate a Chain of Custody Record <br /> to accompany the vapor samples to a State-certified laboratory The vapor samples will be <br /> analyzed for BTEX by modified Environmental Protection Agency (EPA) Method <br /> 5030/8020/602 and for TPHg using modified EPA Method 5030/8015 <br /> 10.0 GROUND-WATER MONITORING <br /> During soil remediation activities,quarterly ground-water monitoring and sampling activities <br /> will continue Active ground-water remediation will be deferred during interim soil <br /> remediation Removal of residual gasoline hydrocarbons by vapor extraction may mitigate <br /> the need for groundwater remediation <br /> 11.0 REPORT PREPARATION <br /> After the installation and start-up of the VES, status reports will be submitted quarterly to <br /> San Joaquin Department of Public Health Services, California Regional Water Quality <br /> Control Board, Central Valley Region, and the SJAQMD <br /> 38032-13 15 <br />