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• i i 31-0329 Table 1 Summary of Results of Ground hater Sampling Chevron Service Station No. 9-6465 5608 North Pershing Avenue, Stockton, California Concentrations in parts per billion (ppb) aassaasss:aaasasaazsssssaszaasaazz:szaaasaz�azasaaazazasaaasaazaamamzzzzsaszzasasazaz:ms:aaaaasasssszasssssaaaasaazzszzaz WELL DATE OF CASING DEPTH GROUND TPH-G B T E X 1,2-DCA LAB ID SAMPLING/ ELEVATION TO WATER MONITORING WATER ELEVATION sazaaaasasasassaaa:asaaaaasaasaaazazzaaaaaaaa::aasaazaaaaaaaaaaaaaaaaaaaaaaaaeaasaaassssazsacaaaasasasasssaza::aaaasassaaus TO 03/23/69 NA NA NA ND<500 ND<0.5 04.5 ND<0.5 ND<0.5 --- SAL TO 07/19/89 NA NA NA ND<500 ND4.5 ND<0.5 ND<0.5 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 ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL TB 07/04/90 NA NA NA ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL TB 08/17/90 NA NA NA ND<50 ND<0.3 0.3 ND<0.3 1 --- GTEL TS 10/22/90 NA NA NA ND<50 ND<0.3 ND<0.3 ND<0.3 ND<0.6 --- GTEL TO 01/19/91 NA NA NA ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- SAL TO 07/21/91 NA NA NA ND<50 ND4.5 ND<0.5 ND<0.5 ND<0.5 --- SAL TB 10/17/91 NA NA NA ND<50 ND4.5 ND40 5 ND<0.5 ND<0.5 ___ SAL j TB 01/09/92 NA NA NA ND-c50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 SAL TB 03/19/92 NA NA NA ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ___ SAL TO 07/01/92 NA NA NA ND<50 ND<0.5 ND<0.5 N0<0.5 N040.5 SAL TO 09/16/92 NA NA NA irD<50 ND<0.5 ND0 5 ND<0.5 04.5 --- SAL ----------------------------------------------------------------------------------------------------.....--------------------.......... EXPLANATION OF ABBREVIATIONS: TPH-G :Total Petroleum Hydrocarbons as Gasoline --- :Not Anatyzed/Not Measured (EPA method 8015 modified) NA Not Applicabte/Not Available B :Benzene (EPA method 8020 or 8240) ND :Not Detected T .Toluene (EPA method 8020 or 8240) TB :Trip Blank E Athylbenzene (EPA method 8020 or 8240) D :Duplicate X :Xylenes (EPA method 8020 or 8240) 8 8 C .Brown L Caldwell Labs 1,2-DCA :1,2-Dichtoroethsns CCAS :CCAS Labs SAL :Superior Analytical Labe GTEL •GTEL (ABS PACE :PACE Labs * :Not sampled due to insufficient water in well. ** Sampled separately to confirm results. # :Dry well. #0 :Single peak in gasoline range. Note: Top of casing and ground water elevations are expressed as feet above mean sea level (NGVD -1929).