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TABLE 4 <br /> GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> Parkinson's Hammer I-5 Arco <br /> 3250 West Hammer Lane, Stockton, California <br /> Well Groundwater Ethyl- Total <br /> Well Date Elevation Depth to Water Elevation GRO[41, Benzene Toluene benzene , Xylenes MTBE <br /> Number Collected (ft msl) (feet) (ft msl) (pg/L) (pg/L) (gg/L) (pg/L) (pg/L) (pg/]L) <br /> MW-6 08/11/06 -NM 14.05 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50. <br /> 11/01/06 15.92 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 02/01/07 15.14 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 04/10/07 14.79 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 07/23/07 15.47 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 10/22/07 -.16.05 NM <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> [5] 01/28/08 6.75 14.07 -7.32 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 04/28/08 15.08 -8.33 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> 07/28/08 . 18.26 -11.51 <50 <0.50 <0.50 <0.50 <0.50 <0.50 . <br /> ote- <br /> GRO=Gasoline Range Organics C4-C13 msl=Mean sea level <br /> MTBE=Methyl tertiary butyl ether µg/L= gra per ^ <br /> micro ms r liter <br /> s <br /> GRO analyzed using EPA Method 8015E and the remaining analytes using EPA.Method 8260B(Method prior to 2Q06 unknown) <br /> [1]=Well casing elevations surveyed by Morrow Surveying on July 2,2002. <br /> [2]=Sample contained compounds in the gasoline range,but the chromatogram pattern was not consistent with the expected pattern. A <br /> [3]=Reporting limits were increased due to high concentrations of target analytes. +. <br /> [4]=Reported as total petroleum hydrocarbons as gasoline(TPHG C3-C14+)prior to second quarter 2006. 8 , <br /> [5]=Well casing elevations surveyed by Wood Rodgers on March 14,2008. Survey conducted jointly with adjacent former BP Station No.11193. <br /> Data prior to 2Q06 provided by Shaw Environmental,Inc. <br /> August 2008 Workplan---Table 4,Table 5.xls Page 6 of 6 STRATUS <br />