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b <br /> �1 INC <br /> (modified), respectively Laboratory analytical results for the water sample are presented <br /> in Table 9 Influent water sample TPH-G concentrations ranged fr analytical <br /> method detection limits (50µg/1) to 220 µg11 Influent water sample PH-G c centrations <br /> were reported to range from below analytical method detection limits s than 0 5 µg11) to <br /> 41 µg11 <br /> All effluent groundwater treatment system samples, with the exception of the sample <br /> collected on September 24, 1992 were reported to contain nondetectable concentrations <br /> of TPH-G and BTEX These nondetectable concentrations of TPH-G and BTEX suggest <br /> an almost complete destruction efficiency for the groundwater treatment system at the site <br /> during the initial operation The initial effluent samples collected on September 24, 1992 <br /> indicating a TPH-G concentration of 73 µg11, may be attributed to a switched sample <br /> (CEECON, 1993) <br /> The groundwater treatment system was operated from the time of its installation in <br /> September 1992 to June 1994 During this time, Sebastiani Vineyards conducted all <br /> maintenance and regulatory agency reporting of the groundwater treatment system <br /> Analytical samples were collected by CalTest Analytical Laboratories, Santa Rosa, <br /> California from the influent and effluent streams of the groundwater treatment system on <br /> August 17, 1993, November 5, 1993, February 1, 1994 and May 10, 1994 These water <br /> samples were transported under a chain of custody document to the laboratory and <br /> analyzed for BTEX by EPA Test Method 602 and TPH-G by EPA Test Method 8015 <br /> (modified) Documentation for these samples have been previously provided by Sebastiani <br /> in quarterly monitoring reports <br /> Analytical laboratory results from the CEECON report (1993) for the water samples are <br /> presented within Table 9 During this time period benzene concentrations were reported <br /> to range from below detection limits to 13 µg11 The average for benzene concentration in <br /> the influent was estimated to be 3 9 4gll Ethylbenzene concentrations were reported to <br /> range from below detection limits to 7 9 µg11 and had an estimated average concentration <br /> of 3 0 µg11 <br /> 19150011 005 35 <br />