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Working To Restore Nature <br /> as gasoline (TPHg) utilizing EPA method 5030/8015 The samples were analyzed by RESNA <br /> Environmental Laboratory <br /> 1 <br /> The monitoring wells were constructed of 2-inch inside diameter PVC 0 010 inch slot well <br /> ' screen and 2-inch PVC casing Cement/sand slurry was used to seal the well, in accordance <br /> with California Water Well Standards (December 1981) <br /> After installation, the wellheads were surveyed and tied into the existing well on site and <br /> ' monitored for free product Free product was not present in either well The wells were then <br /> developed and purger] prior to collection of a water sample Water samples were analyzed by <br /> ' RESNA Analytical Laboratory for BTEX (EPA method 9020) and TPHg (EPA method <br /> ' 503018015) <br /> Benzene was present above method detection limits in soil samples from well MW2 at 55 5 and <br /> 65 feet below grade and in well MW3 at 55 5 and 65 feet below grade The 65 foot sample <br /> ' from MW3 also contained 0 021 ppm xylenes and 2 2 ppm TPHg No other analytes were <br /> detected in any soil sample Table 1 summarizes the results of laboratory analyses <br /> TPHg, benzene & xylenes (MW3) were present in the water samples collected from wells MW2 <br /> ' & MW3 (Table 2) <br /> ' Groundwater Monitoring & Sampling <br /> Groundwater monitoring has been conducted on five occasions since wells MW2 and MW3 were <br /> ' installed The gradient magnitude has ranged from 0 0015 to 0 008 ft/ft and the gradient <br /> direction has varied from north to northeast Water table elevation data are summarized on <br /> ' Table 3 The most recent groundwater gradient is depicted on Figure 3 - <br /> 1g0041\REPORTS\SR-0694 M 5 <br />