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' On February 10, 1992, influent, effluent, and inert gas samples were collected from the influent <br /> vapor stream Laboratory results indicated that the influent vapor stream contained 7,100 µg/L <br /> TPHG and very low oxygen levels (7 1%) and relatively high carbon dioxide levels (5 1%) <br /> The low oxygen and high carbon dioxide levels in the influent vapor stream affected the engine's <br /> ability to efficiently destroy hydrocarbon vapors entering it Based on the internal combustion <br /> engine's efficiency, it was decided to remove the engine and implement a more efficient vapor <br /> treatment technology <br /> ' During the week of March 16, 1992, a 250 SCFM Thermal Oxidation system was installed in <br /> the existing equipment compound to treat the hydrocarbon vapors extracted from the four vapor <br /> extraction wells (Figure 4) The Thermal Oxidizer converts the contaminated soil vapors and <br /> breaks them down to COQ and water with an efficiency of no less than 99% <br /> The Phase I soil remediation equipment included the following <br /> 1 Four vapor extraction wells, VP-1, VP-2, VP-3 and VP-4, <br /> 2 Two, 2 horsepower regenerative blowers operated in parallel to extract <br /> contaminated soil vapor from the extraction wells, and <br /> ' 3 Internal Combustion Engine/Thermal Oxidizer <br /> ' The average influent flow rate to the Thermal Oxidizer was 157 SCFM from all four vapor <br /> extraction wells (VP-1, VP-2, VP-3, VP-4) On May 19, 1992, remediation of vapor extraction <br /> ' wells VP-2, VP-3, and VP-4 was discontinued due to the low levels of detectable petroleum <br /> hydrocarbons Soil remediation activity was then focused on vapor extraction well VP-1 Wells <br /> ' VP-3 and VP-4 were utilized to provide make-up air to increase Thermal Oxidizer efficiency <br /> As specified in the San Joaquin County Unified Air Pollution Control District Authority to <br /> Construct permit No AP 92-111, weekly monitoring was conducted at the site to document <br /> system performance During this monitoring, weekly influent and monthly effluent air samples <br /> 8070792 TLP 4 <br />