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• 0 TABLE 1-SUMMARYOF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11219 1403 COUNTRY CLUB BOULEVARD,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10-037 WELL DATE OF CASING DEPTH TO PRODUCT GROUND WATER TPH-G B T E X LAB ID SAMPLING/ ELEVATION (a) WATER THICKNESS ELEVATION (b) (ppb) (ppb) (ppb) (ppb) (ppb) MONITORING MW-6 08/05/91 5.80 29.82 0.00 -24.02 ND ND ND ND ND PRE MW-6 08/15/91 5.80 -- ---- -- -- - - - PRE MW-6 12/09/91 5.80 30.42 0.00 -24.62 ND ND NO NO NO PRE MW-6 03/09192 5.80 29.53 0.00 -23.73 NO ND NO NO NO PRE MW-6 06/19/92 5.80 29.24 0.00 -23.44 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA MW-6 09/18/92 5.80 31.03 0.00 -25.23 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA MW-6 12/09192 5.80 31.42 0.00 -25.62 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA MW-7 08/05/91 6.21 30.82 0.00 -24.61 70 19 ND ND NO PRE MW-7 08/15191 6,21 -- -- PRE MW-7 12/09/91 6.21 31.36 0.00 -25.15 ND 19 NO 1.2 ND PRE MW-7 03109/92 6.21 30.15 0.00 -23.94 NO ND NO NO ND PRE MW-7 06/19/92 6.21 30.19 0.00 -23.98 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA MW-7 09/18/92 6.21 31.98 0.00 -25.77 90 ND<0.5 ND<0,5 ND<0.5 ND<0.5 ANA MW-7 12/09192 6.21 32.33 0.00 -26.12 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA QC-1 (d) 12109/92 6.21 32.33 0.00 -26.12 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA QC-2 (e) 09/18/92 ---- --- -- ---- ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA QC-2 (e) 12109/92 -- -- - - ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ANA ABBREVIATIONS: NOTES: TPH-G Total petroleum hydrocarbons as gasoline (a) Casing elevations were surveyed on August 20, 1991 B Benzene to the nearest 0.01 foot relative to mean sea level. T Toluene E Ethylbenzene (b) In feet relative to mean sea level. X Total xylenes ppb Parts per billion (c) MW-2 destroyed on 02105191. - Not analyzedlavailable ND Not detected above reported detection limit (d) Blind duplicate. PRE Precision Analytical Laboratory ANA Anametruc,Inc. (e) Travel blank I� 13 Jars-'93 PAGE2