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OLE 1 <br /> Groundwater Monitoring and Analytical Data J <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way,Stockton,Califomla <br /> Elevation Static <br /> Top of Water Groundwater Depth to Ethyl- Total Dissolved <br /> Wel[ID Casing Level Elevation Screen TPHg Benzene Toluene benzene Xytenes ME Oxygen <br /> &Sample Date (feet msl) (feet bgs) (feet mst) (feet bgs) ug/L Ng/L ug/L ugfL Ngo wgIL mg/L <br /> Notes <br /> NA s Not analyzed NS=Not sampled NE=Not evaluated <br /> msl�mean sea level bgs=below ground surface <br /> =measurement not taken mg/L=milligrams per liter <br /> /rg/L=Analytical results in micrograms per liter <br /> TPHg-Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics) <br /> Below detection limit for analytical methods used <br /> =Raised method reporting limit due to high analyte concentration requiring sample dilution <br /> =Raised method reporting limit due to matrix interference <br /> MtBE was analyzed using USEPA Method 8250 unless noted otherwise(sea betow) <br /> [1]=MTBE was analyzed using USEPA Method 8020 <br /> [2]=W star levels collected on 11/5/59 samples collected on 12/17M due to equipment failure <br /> [3]a Water level collected on 712&!00 <br /> [4]Chromatogram Pattern Gasoline C6 C12 <br /> [5]Chromatogram Pattern Weathered Gasoline 06 C12 <br /> [6]Chromatogram Pattern Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6 C12 <br /> [7]Chromatogram Pattern Unidentified Hydrocarbons C6 C12 <br /> I8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble <br /> the pattern of the requested fuel <br /> 191 Sample was re analyzed outside of USEPA recommended held time at a dilution <br /> [101 The sample was diluted due to the presence of high Levels of non-target anatytes resulting In <br /> below elevated reporting limits <br /> Numbers in ca[umn next to weft designatlon indicate discrete depth samples In feet bgs <br /> Beginning 6/13102 analytical data vaEtdatlon Is provided in the text <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 approAmata concentration of the analyte In the sample <br /> N The analysis Indicatea the presence of an analytic 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 approAmale <br /> concentration <br /> UJ The analyte was not detected above the reported sample reporting limit However the reported reporting limit is approrAmate and may or may not <br /> represent the actual limit of quantriallon necessary to accurately and precisely measure the analyte In the sample <br /> R The sample results are rejected due 10 senous 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\WprocsssV5 BP ARC0\02168\Quarterlo QTR 03\2168 GW MR$003 <br /> Page 9 of 9 <br />