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Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station#5098 5400 and 5606 Pacific Avenue Stockton,California EXPLANATIONS Groundwater momtonng data and laboratory analytical results prior to September 15, 1998,were compiled from reports prepared by MPDS Services,Inc Groundwater monitoring data and laboratory analytical results through June 2000,were complied from reports prepared by G-R Inc Groundwater monitoring data and laboratory analytical results prior to December 2001,were compiled from reports prepared by Environmental Audit Inc, TOC=Top of Casing Elevation TPH-G=Total Petroleum Hydrocarbons as Gasoline MTBE=Methyl Tertiary Butyl Ether DTW=Depth to Water B=Benzene 1,2-DCA= 1,2-Dichloroethene (ft)=Peet T=Toluene ppb=Parts per billion GWE=Groundwater Elevation E=Ethylbenzene ND=Not Detected msl=Relative to mean sea level X=Xylenes --=Not Measured/Not Analyzed * TOC elevations have been surveyed relative to mean sea level(msl)per the City of Stockton Benchmark No 14(Elevation=10 95 feet msl) Prior to June 28, 1993,the DTW measurements were taken from the top of well covers 1 Laboratory report indicates sample was analyzed outside of recommended holding time 2 Laboratory report indicates 1,2-Dichloropropane was detected at 5 3 ppb 9 Laboratory report indicates 1,2-Dichloropropane was detected at 13 ppb 4 Laboratory report indicates 1,2-Dichloropropane was detected at 1 6 ppb 5 Laboratory report indicates Methylene chloride was detected at 4 8 ppb 6 Laboratory report indicates 1,2-Dichloropropane was detected at 13 ppb, Methylene chloride was detected at 2 4 ppb 7 Laboratory report indicates Chloroform was detected at 3 7 ppb 8 Laboratory report indicates Chloroform was detected at 3 0 ppb 9 Laboratory report indicates Chloroform was detected at 13 ppb Y0 Laboratory report indicates 1,2-Dichloropropane was detected at 1 2 ppb 1 i Laboratory report indicates Chloroform was detected at 2 6 ppb 12 Laboratory report indicates Chloroform was detected at 16 ppb 13 Laboratory report indicates Chloroform was detected at 1 2 ppb 14 Laboratory report indicates 1,2-Dichloropropane was detected at 12 ppb, p-Isopropyltoluene was detected at 1 5 ppb 15 Laboratory report indicates 1,2-Dichloropropane was detected at 3 4 ppb, p-Isopropyltoluene was detected at 6 2 ppb 16 Laboratory report indicates p-Isopropyltoluene was detected at 8 4 ppb 17 Laboratory report indicates p-Isopropyltoluene was detected at l 1 ppb 18 Laboratory report indicates Tetrachloroethene was detected at 14 ppb 19 Laboratory report indicates p-isopropyltouluene was detected at 1 1 ppb, 20 Laboratory report indicates Methylene chloride,a laboratory contaminant,was detected at 25 U ppb 0 8fl046 0 41 12/04/01 5098 xls!