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11 Table 1 <br /> Ground a ter Monitoring Data and Analytical Results k <br /> Former Unocal Service Station#5098 _ <br /> f 5606 Pacific Avenue " <br /> Stockton,California <br /> u 1 <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to September 15, 1998,were compiled from reports prepared by MPDS Services,Inc - <br /> TOC=Top of Casing Elevation B i Be�ne ppb=Parts per billion <br /> DTW=Depth to Water T="Toluene ND=Not Detected <br /> (ft)=Feet E=Ethylbenzene --=-Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation X Xylenes <br /> h <br /> es <br /> msl=Relative to mean sea level MTBE Meth) Tertiary Butyl Ether ; - - <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline 1,il)CE1=1,2-bichloroethene h - <br /> 1 s <br /> * TOC elevations have been surveyed relative to mean sea level(rzisl)pg.the City of Stockton BenchmarkNo14(Elevation= l0 95 feet msl) -Pnor to Julie 28, 1993,the DTW <br /> measurements were taken from the top of well covers <br /> Well has been destroyed. r _ <br /> 2 Nitrates were ND,and coliform bacteria were below detection limits 3 <br /> 3 All EPA Method 8010 constituents were ND,except for concentrations of bromodichloromethane at 0 53 ppb,chloroform at 14 ppb,and <br /> I <br /> dibromochloromethane at 0 97 ppb <br /> ° Laboratory has potentially identified the presence of MTBE at reportaIb le levels in the groundwater= sample collected from this well <br /> S Laboratory has identified the presence of MTBE at a level above or equal to�the taste and odor threshold of 40 ppb in the sample collected from this well <br /> 6 Laboratory report indicates the hydrocarbons detected appearediiobe is gasoline and non-gasoline mixture <br /> 7 MTBE by EPA Method 8260 <br /> s Detection limit raised Refer to analytical reports <br /> 9 All EPA Method 8010 constituents were ND <br /> 10 Laboratory report indicates unidentified hydrocarbons C6-C8 � _ <br /> Sampled by Environmental Audit,Inc <br /> iz_ Laboratory report indicates gasoline C6-C12 <br /> 13 Laboratory report indicates unidentified hydrocarbons C6-Cl2 - <br /> _ <br /> is Laboratory report indicates weathered gasoline C6-C12 <br /> 3 <br /> Y r <br /> I F <br /> 5M8*W46 • 1 •W/15/00 <br /> 1 <br />