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I <br /> i <br /> Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#2859 <br /> a �f 1665 Pacific Avenue <br /> �3 <br /> Stockton,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to;March 6,1998,were compiled from reports prepared by MPDS Services,Inc <br /> TOC=Top of Casing j B=Benzene ppb=Parts per billion <br /> DTW=Depth to Water T=Toluene ND=Not Detected <br /> (ft)=Feet 11 E=Ethylbenzene --=Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation ; X=Xylenes D = Duplicate <br /> msl=Mean sea level MTBEI=Methyl tertiary butyl ether EB = Equipment Blank <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline i3I <br /> i f <br /> * TOC elevations have been surveyed relative to mean sea level On February 10, 1999,TOC measurements were re-surveyed relative to City of Stockton BM#24,msl <br /> Laboratory report indicates the hydrocarbons detected appeared to be a�gasoliae and non-gasoline mixture <br /> Laboratory report indicates the hydrocarbons detected did not appear to�be gasoline LL <br /> 3 Detection limit raised Refer to analytical reports li ` <br /> ° MTBE by EPA Method 8260 1 " <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C 12 h _ <br /> 6 � s <br /> Laboratory report indicates gasoline and umdentified hydrocarbons>C8 <br /> 7 Well development only jj 11 <br /> S Laboratory report indicates gasoline and unidentified hydrocarbons C6i 12 <br /> Y Laboratory report indicates discrete peaks - <br /> i0 Laboratory report indicates gasoline C6-C12 <br /> J � r <br /> I <br /> ANALYTICAL METHODS <br /> EPA Method 8015 for TPH(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted - <br /> EPA Method 8260 for MTBE where noted <br /> t <br /> I I [ <br /> I, P <br /> �} yJ <br /> I] I II <br /> t <br /> I + <br /> E <br /> n <br /> -r <br /> I4 i <br /> l <br /> y <br /> I t <br /> 2859 x154 � i � F �/07/90 <br />