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0 &E1 • <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2186 <br /> 3212 North Caldomia Street,Stockton Caldomia <br /> Top of Casing Static Water[l] Screen Groundwater Total <br /> Well Sample Elevatlon Level Interval Elevation Groundwater TPI-Ig Benzene Toluene Ethylbenzene Xylenes MtBE[3] <br /> Sample No Date (feet msl) feet bgs) (feet bgs) (feet msl) Flow Direction pgfL pg/L pg/L pgtL pg/L yg/L__ Observations <br /> Notes <br /> = Below detection limit for the analytical method used <br /> = Raised MRL due to high analyte concentration requiring sample dilution <br /> = Reporting limit raised due to matrix interference <br /> bgs = below ground surface <br /> FP = Free product Measured in feet <br /> mg/L = micrograms per Liter <br /> msl = mean sea level <br /> MtBE = Methyl tert-butyl ether <br /> NA = Not analyzed <br /> NM = Not measured <br /> NS = Not sampled <br /> S = Sheen <br /> TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics) <br /> [1]Measured below top of casing <br /> [2]Measured from ground surface <br /> [3]MtBE was analyzed using USEPA Method 8020 <br /> 141 MtBE was analyzed using USEPA Method 8260 <br /> 151 Chromatogram Pattern Weathered Gasoline 06-C-12 <br /> (6]Sample analyzed outside USEPA recommended hold time <br /> (7]Hydrocarbon pattern Is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel <br /> (8]On the chain-of-custody forms,samples were identified as MW-1 B,MW-26,and MW-3B,respectively <br /> Data Qualifier Definitions <br /> U The analyte was analyzed for but was not detected above the sample reporting limn <br /> J The analyte was positively identified the associated numencal 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 umd of quantitation necessary to accurately and precisely measure the analyte in the sample <br /> R The sample results are rejected due to serious deficiencies in the ability to analyze the sample (i a,the presence or absence of the analyte cannot be <br /> verified)or the analyte identification has been rejected(i a the presence of the analyte cannot be verified) <br /> ND Not detected above reported detection limit <br /> K LWproceWJ5 BP ARCO\0218tAOuartedyQ OTR 0312186 GWMR 3003 Page 8 018 <br />