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Corrective Action Plan <br /> Montgomery Ward Auto Service Center, Stockton, CA <br /> the recovery of contaminants This will complete the startup and optimization of the <br /> Isystem <br /> Air Sparj!ing S stem <br />' Air sparging will not be started until the vapor extraction system has operated for a few <br /> months and vapor concentrations have settled to a steady level or a steady declining rate <br /> The reason for this is to be able to observe the effects of air sparging on vapor <br /> concentrations and to be able to track such changes <br /> Once the vapor extraction system reaches the desired level, a one to two day air sparging <br />' system startup will be performed During this startup, EAI will perform the following <br /> tasks <br /> ■ Measure ground water level at the selected air sparging well and adjacent <br />' monitoring wells <br /> ■ Obtain and analyze ground water samples from the selected air sparging well and <br /> adjacent monitoring wells <br /> ■ Measure dissolved oxygen levels <br /> ■ Start air sparging <br /> ■ Measure water levels and dissolved oxygen periodically for several hours <br /> ■ Pulse the air injection using a timer so that the injection is turned on for a period of <br /> one to two hours and followed by a period of one to two hours of no sparging <br /> ■ Initially, air sparging will be implemented by injecting approximately 5 scfm of <br /> pressurized air in each air sparging well EAI will then test the influence of this <br /> injection rate and may increase the injection rate up to a maximum of 20 scfrn <br /> 8.5 Operation and Maintenance <br /> Field Procedures and Measurements <br /> Following optimization, the soil vapor extraction system will be run continuously (24- <br /> hours a day, seven days a week), if conditions permit it During this time, the following <br /> tasks will be performed on a weekly basis <br /> C Check the SVES unit to ensure that the system is up and running as scheduled with <br /> no maintenance requirements These weekly checks will include inspection of the <br /> knockout pot, checks of all warning lights, temperature in combustion chamber and <br />' electric combustion <br /> ■ Check the air sparging unit to ensure that the system is properly operating <br /> ■ Measure flow rates and pressures recorded at the sparging unit <br /> Measure inlet and exhaust yv,�apor concentrations using a PID or an FID <br /> ■ `>djust dilution air LTJ lllL XiMi4e removal rates <br /> In addition, the following tasks will be performed on a monthly basis <br />' ■ Change or adjust wells used as active extraction wells in order to maximize <br /> recovery of contammanLs <br /> ■ Obtain and analyze inlet and exhaust vapor samples by laboratory analyses <br /> ■ Measure water levels in ground water for wells surrounding air sparging wells <br /> Project No 1232 - 27 - <br /> SAB WORD 1232CAP <br />