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T•E 1 t i GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY FORMER APACHE PLASTICS FACILITY 2050 EAST FREMONT STREET STOCKTON,CALIFORNIA Depth to Well Groundwater Ethyl- Total Date Water Elevation Elevation TPHG Benzene Toluene benzene Xylenes MTBE WELL# Sampled (ft bgs) (ft msl) (ft ms1) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) MW-12 L 05/18/01 5038 1767 -32 71 <50 <0 50 17 <0 5 181 <0 50 11/05/01 47 95 -3028 NA NA NA NA NA NA 02/14/02 4678 -29 11 <50 <0 50 1 7 <0 50 <0 50 <0 50 05/20/02 5580 -3813 <50 <0 50 058 <0 50 <0 50 <0 50 08/27/02 5292 -3525 <50 <0 50 <0 50 <0 50 <0 50 <0 50 12/05/02 5165 -3398 <50 <0 50 3 3 066 43 076 02/05/03 5160 -3393 <50 <0 50 <0 50 <0 50 <0 50 076 05/28/03 5198 -3431 <50 <0 50 <0 50 <0 50 <0 50 <0 50 08/11/03 5194 -3427 <100**** <0 50 <0 50 <0 50 <0 50 <0 50 11/10/03 5249 -34 82 <50 <0 50 <0 50 <0 50 <0 50 <0 50 i NOTES PHG=Total petroleum hydrocarbons as gasoline msl=Mean Sea Level MTBE=Methyl tertiary butyl ether bgs=Below Ground Surface U=Upper water bearing zone(wells screened from 46 5 to 70 feet bgs) pglL= micrograms per liter L=Lower water bearing zone(wells screened from 94 to 115 feet bgs) A=Not Analyzed M=Not Measured or Well casing elevation has not been surveyed *=Reporting limits were increased due to high concentrations of target analytes **=Well MW-3 is obstructed at approximately 23 feet bgs *** —Well was previously identified as MW-I All groundwater samples have been collected from well VEW-2 ****=Reporting limits increased due to sample foaming Historical monitoring and sampling data prior to May 18,2001,was submitted by previous consultants Copies of available tables summarizing this data are included in Stratus'Site Conceptual Model (Appendix B),dated September 24,2002 Apache_Quarterly_Data Page 7 of 7 STRATUS