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TABLE 1 <br /> Groundwater Elevation and Analytical Data , <br /> ARCO Service Station No.548 <br /> 1612 Hammer Lane,Stockton,California <br /> Well Top of Static Top Groundwater Ethyl- Total <br /> Sample Sample Casing Water of Groundwater Flow TPHg Benzene Toluene benzene Xylenes MtBE[1] <br /> Number Date Elevation Level Screen Elevation Direction ugn- Ng/L pg1L ug/L ugIL pg/L Observations <br /> Notes: <br /> Elevation datum is mean sea level. <br /> Measurements in feet. <br /> < = Below detection limits used by laboratory. <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 /> # = Bailer blank. <br /> MtBE = Methyl tert-butyl ether. <br /> NA = Not analyzed. <br /> NE = Not evaluated. <br /> NM = Not measured, <br /> NP = No purge. <br /> P = Purge <br /> TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics) <br /> ug/L = micrograms per Liter <br /> Sample designations: <br /> MW-4(34)-Well ID and sample depth(feet), <br /> FP-Free product, <br /> S- Sheen. <br /> 0-Obvious product odor. <br /> [1]MTBE was analyzed using USEPA Method 8020. <br /> [2]MTBE was analyzed using USEPA Method 8260. <br /> [3]Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel. <br /> [4]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. <br /> [5]The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. <br /> Data Qualifier Definitions: <br /> U The analyte was analyzed for,but was not detected above the sample reporting limit. <br /> J The analyte was positively identified;the associated numerical value is the approximate concentration of the analyte in the sample. <br /> N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a'tentative identification." <br /> NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical value represents its approximate <br /> concentration. <br /> UJ The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and may or may not <br /> represent the actual limit of quantitation necessary to accurately and precisely measure the analyte In the sample. <br /> R The sample results are rejected due to identification or other analytical issues. <br /> ND Not detected above reported detection limit <br /> KAVVproaeasUS BP ARC01005485Quartcr1yM QTR 0410548 QMR 40o3 Page 10 of 10 <br />