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TOPE . <br /> i <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station No 2168 <br /> 441 Charter Way <br /> Stockton,Callfomla <br /> Elevation <br /> Top of Static Groundwater Depth to Ethyl- Total Dissolved <br /> Well ID & Casing Water Level Elevation Screen Benzene Toluene benzene Xylenes MISE Oxygen <br /> Sample Data (feet msl) (feet bgs) (feet msl) (feet bgs) TPHg prg/L prg/L P 91L PVL P91L prg/L mg/L <br /> Notes <br /> measurement not taken <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 /> bgs = below ground surface <br /> mgfL = milligrams per liter <br /> mil = mean sea level <br /> NA c not analyzed <br /> NE = not evaluated <br /> NS = not sampled <br /> TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO gasoline range organics) <br /> /rg/L = Analytical results in micrograms per liter <br /> Beginning 8113/02,analytical data validation is provided in the text <br /> MtBE was analyzed using USEPA Method 8260,unless noted otherwise(see below) <br /> Numbers in column next to well designation indicate discrete depth samples in feet bgs <br /> [1] = MTBE was analyzed using USEPA Method 8020 <br /> [2] = Water levels collected on 1115199,samples collected on 12/17/99 due to equipment failure <br /> [3] = Water level collected on 2125/00 <br /> [a] = Chromatogram Pattern Gasoline C6-C12 <br /> [5] = Chromatogram Pattern Weathered Gasoline CB C12 <br /> [6] = Chromatogram Pattern Weathered Gasoline C9 C12+Unidentified Hydrocarbons C6 C12 <br /> [7] = Chromatogram Pattern Unidentified Hydrocarbons C6 C12 <br /> [8] = Hydrocarbon pattem is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> [9] = Sample was re analyzed outside of USEPA recommended hold time at a dilution <br /> [101 = The sample was diluted due to the presence of high levels of non target analytes resulting in below 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 analyle in the sample <br /> N The analysts 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 Mayor 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 /> k 1WprocessV5 BP AR001021 e8\Quartedyl4 QTR 0312168 GWNIR 4003 <br /> Page 9 of 9 <br /> i <br />