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' Mr Michael Walton • <br /> Walton Engineering <br />' August 4, 1998 <br /> (SP2)remaining in the excavation,prior to its removal These individual samples were collected from <br />' the bucket of the excavator in the same manner as describe in the previous section Each set of four <br /> individual soil samples were composnted by the laboratory into one soil sample for analytical testing <br />' LABORATORY ANALYSES AND RESULTS <br /> All of the soil samples collected from beneath the former underground fuel storage tanks,former fuel <br />' dispenser island, and from the associated soil stockpiles were analyzed by California Laboratory <br /> Services, Inc , (CLS) of Rancho Cordova, California for <br />' Total petroleum hydrocarbons in the range of gasoline (TPHg) using Environmental <br /> Protection Agency(EPA) Method 8015 (modified) with purge and trap EPA Method 5030 <br /> • Volatile organic compounds benzene, toluene, ethylbenzene, total xylene isomers (BTEX) <br />' using EPA Method 8020 with purge and trap EPA Method 5030 <br /> All of the soil samples collected from beneath the former underground storage tanks and from <br />' beneath the former fuel dispenser island were also analyzed for <br /> • Volatile organic oxygenates di-isopropyl ether(dIPE), ethyl t-butyl ether (EtBE), methyl t- <br />' butyl ether (MtBE), t-amyl methyl ether (tAME), and t-butyl alcohol (tBA) using EPA <br /> Method 8260 (modified) <br /> In addition to these analyses, the two soil samples collected from beneath the former fuel dispenser <br /> island,the two soil samples collected from beneath former underground storage tank T3,and the five <br /> soil sample composites collected from the soil stockpiles were analyzed for <br /> • Total lead using EPA Method 6010 <br />' CLS is accredited by the State of California to perform all of these analyses <br />' Laboratory results of soil samples collected from beneath the former underground storage tanks <br /> indicated that only elevated concentrations of MtBE and tBA were detected in soil samples collected <br /> from beneath the underground storage tanks(Table 1) The highest concentrations of MtBE and tBA <br />' were detected in the soil sample collected from beneath the south end of underground storage tank <br /> T2 (Figure 2) Soil samples collected from beneath the former fuel dispenser islands contained only <br /> slightly elevated concentrations of total xylene isomers and tBA Total lead was not detected at <br />' concentrations greater than the reporting limit of the laboratory method in any of the soil samples <br /> analyzed for lead <br /> Laboratory analytical results ofthe soil sample composites collected from the soil stockpiles indicated <br /> that only a slightly elevated concentration of TPHg was detected in one soil sample composite and <br /> only slightly elevated concentrations of total xylene isomers were detected in three of the soil sample <br />' composites(Table 2) Total lead was not detected at concentrations greater than the reporting limit <br /> . of the laboratory method in any of the five soil sample composites (Table 2) <br /> GRAYLAND ENVIRONMENTAL <br /> Grayland 022-140 trr 3 <br /> 1 <br />