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y <br /> 2.7 SOIL RIrMEDIATION <br /> A vapor extraction and treatment system(VETS)consisting of a 100-cfm(cubic feet per minute) <br /> vacuum pump that removes vapor from the soil through extraction wells was made operational <br /> d vapor is pumped to either a thermal or a catalytic oxidizer, <br /> on 15 November 1990. Extracte <br /> where it is converted into carbon dioxide and water with a minimum of 95 percent efficiency. <br /> 2.8 QUARTERLY GROUNDWATER SAMPLING AND ANALYSIS <br /> The groundwater beneath former Chevron SS 9-1918 was monitored at quarterly intervals from <br /> January 1989 to December 1989 and then once,in September 1990, when all of the existing <br /> monitoring wells went dry due to the current drought. EA's field crew gauged the depth to water <br /> with an optical interface probe(Table 3), and groundwater was sampled according to standard <br /> EA protocols(Appendix A) that are consistent with San Joaquin Local Health guidelines and <br /> submitted to Pace Laboratories, <br /> Tri-Regional Recommendations. Samples of groundwater were <br /> where they were analyzed for TPH as gasoline by EPA Method 8015 and for BTEX by EPA. <br /> ults are summarized with the results of previous <br /> Method 80201602. The quarterly analytical res <br /> groundwater sampling in Table 2. The field notes from September 1990 are contained in <br /> Appendix B. <br /> .k <br /> S <br /> 4 <br />