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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11193 3202 WEST HAMMER LANE,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10-136 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D TPH B T E X MTBE HVOC DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ugA) (ug4) (ug/l) (ug/l) (ugA) (ugl) M-0) (ugA) (ugA) (ppm) MONITORING (Feet) (Feet) (Feet) QC-2 (1) 04/04!93 -- -• --- ND<50 - -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 - PACE QC-2 (1) 10/05/93 - - -•- ND<50 - -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 - --- ••. PACE QC-2 (t) 01/07/94 --- - - ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 - - PACE QC-2 (1) 04/20/94 - - --- ND<50 - --- ND<0.5 ND<0.5 ND<0.5 N0<0.5 - - PACE QC-2 (1) 07128/94 - - -- ND<50 - - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - PACE OC-2 (1) 12/091'94 - - - ND<50 •-- --- ND<0.5 ND<O.5 ND<0.5 ND<1 -- - _ PACE OC-2 (4 03/031'95 - - - ND<50 - --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 - - - ATI OC-2 (1) 04/12/95 --- - - ND<50 - --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 -- - ATI OC-2 (1) 07120/95 --- - ND<50 - -- ND<o.50 ND<0.50 ND<0.50 ND<1.0 - -- ATI OC-2 (i! 11/02/95 - --- ND<50 - -- ND<0.5 ND<0.5 ND<0.5 ND<1.0 ND<5.0 - An ABBREVIATIONS: NOTES: TPH-G Total petroleum hydrocarbons as gasoline (a) Casing elevations surveyed to the nearest 0.01 foot relative to mean sea level. TPH-D Total petroleum hydrocarbons as diesel TPH Total petroleum hydrocarbons (b) Groundwater elevations in feet above mean sea level. B Benzene T Toluene (c) Blind duplicate. E Ethyrbenzene X Total xylenes (d) Sample pattern does not match gasoline standard pattern. MTBE Methyl tart butyl ether HVOC Halogenated volatile organic compounds (e) Detection limits vary;see laboratory report. DO Dissolved oxygen ug4 Micrograms per liter (if Travel blank. ppm Pads per million -- Not measured/analyzedlappficable ND Not detected above reported detection limit PACE Pace,Inc. ATI Analytical Technologies Inc. F1CdP1M13F62We7 24-Jan-96 PAGE 3