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Working To Restore Nature <br /> gglf, respectively, in the Baker tank water sample and TPHd, ethylbenzene and xylenes were <br /> present at 330 µgl f, 4.8 lcgl P and 3.4 ggl i, respectively, in the tank pit water sample. <br /> The water in the Baker tank was remediated by enhanced bioremediation. The stored water was <br /> sampled on December 21, 1992, January 26, 1993 and February 23, 1993 and analyzed for <br /> TPHd and BTEX to gauge the progress of remediation. Table 5 presents the Baker tank <br /> =? sampling analytical results. The February 23, 1993 samples confirmed that the stored water was <br /> clean and the water was disposed of in accordance with the criteria outlined in CRWQCB <br /> w+ correspondence dated April 14, 1993. <br /> F <br /> 3.3 GROUNDWATER MONITORING AND SAMPLING <br /> Sixteen rounds of groundwater monitoring have been conducted at the site since October 1989. <br /> Table 1 summarizes water level information. The groundwater gradient, which has been <br /> consistent over the life of the project, has been to the north-northwest at a magnitude of 0.003 <br /> ffr;: <br /> to 0.005 ft/ft. <br /> f <br /> On one occasion only, May 22, 1990, were significant levels of contaminants detected in the <br /> groundwater at the site. This instance was in a sample collected from well MW4, installed five <br /> = feet downgradient of the former tank. The groundwater sample was collected immediately <br /> following well installation. The hydrocarbons detected in the water sample are thought to have <br /> f" been a result of soil disturbance resulting from well drilling and completion activities. <br /> Subsequent to May 1990 trace levels of toluene, ethlylbenzene, and xylenes were detected on <br /> -' four occasions (Table 3). <br /> Beginning in July 1992 the sampling program was modified to include only downgradient wells <br /> MW-3 and MW-4. Following destruction of well MW-4 during excavation activities in October <br /> OW01951REPORTS\CL012594.FNL 7 <br />