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Groundwater Elevation and Analytical Data <br /> 76(Former BP)Service Station No 11193 <br /> 3202 W Hammer Lane, Stockton, California <br /> Well Date of PINP Well Depth to Groundwater Groundwater TPHg TPHd TPH B T E X MtBE VOCs[1] DO <br /> Number Sampling Elevation Water Elevation Elevation (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (ppm) <br /> (Feet) (Feet) (Feet) Change <br /> (Feet) <br /> QC-2 4/12/1995 — — — --- ND<50 — ND<0 50 ND<0 50 ND<0 50 ND<1 0 -- -- --- <br /> (cont) 7/20/1995 --- --- --- - ND<50 --- --- ND<0 50 ND<0 50 ND<0 50 ND<1 0 --- --- <br /> 11/2/1995 --- --- --- — ND<50 -- --- ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<5 0 -- --- <br /> 1/16/1996 --- --- --- ND<50 — --- ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<5 0 — — <br /> 4/2211996 -- -- --- -- ND<50 --- --- ND<0 5 ND<1 ND<1 ND<1 ND<10 --- <br /> 7112/1996 — — - -- ND<50 --- --- ND<0 5 ND<1 ND<1 ND<1 ND<10 — --- <br /> Notes <br /> TPHd Total petroleum hydrocarbons as diesel DO Dissolved oxygen <br /> TPHg Total petroleum hydrocarbons as gasoline ppm Parts per million <br /> B Benzene uglL Micrograms per liter <br /> T Toluene PINP Purge/No Purge <br /> E Ethylbenzene ND Not detected above reported detection limit <br /> X Total xylenes — Not measuredlanalyzedlapplicable <br /> MtBE Methyl tert butyl ether <br /> VOC Halogenated volatile organic compounds <br /> (1] VOCs by EPA 8260B,not including BTEX and oxygenates <br /> [2) Halogenated VOCs only <br /> [3] Analysis conducted in excess of EPA recommended hold time,results should be considered biased low <br /> [4] Lab reports significant headspace in Volatile Organic Analysis(VOA)vial <br /> Analysis conducted in excess of EPA recommended hold time results should be considered biased low <br /> [5] Napthalene <br /> [6] Discrete Peak @ MtBE <br /> [7] Hydrocarbon reported in the gasoline range does not match the laboratory's gasoline standard <br /> [8] Sample contains a discrete peak in addition to gasoline <br /> [9] Lab reports that gs-Siloxane peaks were found in the sample,which are not believed to be gasoline related,if quantified as gasoline,the concentration would be 50 ug1L <br /> [10] Quantity of unknown hydrocarbon(s)in sample based on diesel <br /> [11] Surrogate recovery lower than acceptance limits,matrix interference suspected <br /> [12] Reporting limits for analytes other than diesel were raised due to high level of analyte present in the sample <br /> I lConocoPhillipslRetail Sites1111931TableslQMR Tables111193 40MR04 As Page 13 of 13 <br />