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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11192 1403 COUNTRY CLUB BOULEVARD,STOCKTON,CALIFORNIA . ALISTO PROJECT NO. 10-037 WELL DATE OF CASING DEPTH TO GROUNDWATE TPH-G B T E X DO LAB ID SAMPLING/ ELEVATION(a) WATER ELEVATION(b) (ugA) (ugA) (ugA) (ugA) (ucyl) (ppm) MONITORING (Feet) (Feet) (Feet) QC-2 (g) 09/15.92 - --- - ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA OC-2 (g) 12/09/92 -- --- --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - ANA OC-2 (g) 03111/93 - --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- PACE QC-2 (g) 06/15/93 -- - •-- ND<50 N04.5 ND<0.5 ND<0.5 1.3 - PACE OC-2 (g) 09/15!93 --- --- - ND<50 ND<0.5 ND<0.5 ND<0.5 0.7 --- PACE OC-2 (g) 12022/93 -- --- --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE QC-2 (g) 04/01/94 --- -» --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE QC-2 (g) 07/27/94 -- - ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- PACE OC-2 (g) 11/30/94 - --- --- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- PACE QC-2 (g) 02/15/95 -- - --- ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 - All QC-2 (g) 04/21/95 --- - --- ND<50 0.80 1.50 ND<0.50 ND<1.0 - ATI ABBREVIATIONS: NOTES: TPH-G Total petroleum hydrocarbons as gasoline (a) Casing elevations surveyed to the nearest 0.01 foot B Benzene relative to mean sea level on August 20,1991. T Toluene E Ethylbenzene (b) Groundwater elevations in feet relative to mean sea level. X Total xylenes DO Dissolved oxygen (c) Well covered by landscaping. ugA Micrograms per(iter PPM Parts per million (d) Well destroyed on February 5, 1991. ND Not detected above reported detection limit • - Not applicable/measuredlanalyzed (e) Blind duplicate. PRE Precision Analytical Laboratory ANA Anametrix,Inc. (f) Anomalous data,not consistent with trend of other wells for preceeding quarter PACE Pace,Inc. ATI Analytical Technologies,Inc. (g) Travel blank E:10110-037-3-4 07-Jun-95 PAGE 3