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�Yl <br /> TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> Former ARCO Service Station No. 548 <br /> 1612 Hammer Lane,Stockton,California <br /> Well Elevation Static Top Elevation Groundwater <br /> Sample of Top Water of of Flow Ethyl- Total <br /> Number Date of Casing Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE [11 Observations <br /> Analytical results in micrograms per liter. P=Purge. <br /> TPHG-Total petroleum hydrocarbons as gasoline. NP=No purge. <br /> MTBE-Methyl tertiary butyl ether. <-Below detection limits used by laboratory. <br /> Elevation datum is mean sea level. [l]MTBE was analyzed using USEPA Method 8020. <br /> Measurements in feet. [2]MTBE was analyzed using USEPA Method 8260. <br /> NA-Not analyzed. Sample designations: <br /> NM-Not measured. MW-4(34)-Well ID and sample depth(feet). <br /> NE-Not evaluated. FP-Free product. <br /> #-Bailer blank. S- Sheen. <br /> O-Obvious product odor. <br /> *-Raised MRL due to matrix interference. <br /> **-The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline;the chromatogram does not match the typical gasoline fingerprint. <br /> ***-Raised MRL due to high analyte concentration requiring sample dilution. <br /> Arco 0548_Quarterly_Data.XLS Delta <br /> - 10 of 10 <br />