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RZ <br /> -w <br /> Working To Restore Nature <br /> ' method 8020 and TPHg utilizing EPA method 5030/8015 The samples were analyzed by <br /> RESNA Environmental Laboratory <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 purged pnor 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 /> ' Groundwater Monitoring & Sam lin <br /> On February 21, 1991 confirmation groundwater samples were collected for analysis from <br /> monitoring well (MW 1) The samples were analyzed for benzene, toluene, ethylbenzene, and <br /> ' xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) by EPA methods <br /> 8020/8015 Benzene was detected at 0 6 parts per billion (ppb) in the February 21, 1991 <br /> sample No other petroleum hydrocarbon analytes were detected above method reporting limits <br /> A second sample was collected from MW 1 on April 18, 1991 The sample was split and <br /> ' analyzed by both Sequoia and Applied Analytical Laboratories Benzene was again detected at <br /> I5004MEPORTSMP-0594 FNL 5 <br />