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30-32* Table 1 Summary of Results of Ground Water Sampling Chevron Service Station # 9-6465 5608 North Pershing Drive Stockton California Concentrations in parts per billion (ppb) WELL DATE OF CASING DEPTH GROUND TPH-G B T E X EDC LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION RINSATE 03-23-89 NA NA NA ND<500 ND<0 5 ND<0 5 ND<O 5 ND<0 5 --- SAL RINSATE 07-19-89 NA NA NA ND<500 ND0 5 ND<0 5 ND<0 5 ND<0 5 --- SAL RINSATE 07-04-90 NA NA NA N0450 ND<0 3 ND<0 3 ND40 3 ND40 6 --- GTEL RINSATE 10-22-90 NA NA NA ND<50 ND<O 3 ND<0 3 ND<0 3 ND40 6 - GTEL TB 03-23-89 NA NA NA ND<500 ND<O 5 ND0 5 ND<O 5 ND<0 5 --- SAL TB 07-19-89 NA NA NA ND<500 ND<0 5 ND<0 5 ND40 5 ND(0 5 --- SAL TB 10-05-89 NA NA NA ND+250 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- PACE TB 05-09-90 NA NA NA ND450 ND<O 3 ND<O 3 ND40 3 ND<0 6 --- GTEL TS 07-04-90 NA NA NA ND<50 ND40 3 ND<0 3 ND<0 3 ND40 6 --- GTEL TB 08-17-90 NA NA NA ND<50 ND<O 3 0 3 ND<0 3 1 --- GTEL TB 10-22-90 NA NA NA ND450 ND<0 3 ND40 3 ND<O 3 ND40 6 --- GTEL ------------------------------------------------------------------------------------------------------------------------------- EXPLANATION OF ABBREVIATIONS TPH-G Total Petroleum Hydrocarbons as Gasoline ND Not Detected (EPA method 8015 modified) TB Trip Blank B Benzene (EPA method 8020 or 8240) D Duplicate T Toluene (EPA method 8020 or 8240) B & C Brown & Caldwell Labs E Ethvlbenzene (EPA method 8020 or 82401 CCAS CCAS Labs X Xvlenes (EPA method 8020 or 8240) SAL Superior Analvtical Labs EDC 1 2-Dichloroethane GTEL GTEL LABS --- Not Analvzed/Not Measured PACE PACE Labs NA Not Applicable/Not Available ' Not sampled due to insufficient water in well *� Sampled separately to confirm results Note Top of casing and Ground Water Elevations are expressed as feet above mean sea level (NCVD -1929) ------------------------------------------------------------------------------------------------------------------------------- 16-Jan-91