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s � • <br /> Table 2 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> Product <br /> WELL IDI DATE DTW sl GWE Thickness TPH-G B T E X MTBE <br /> TOC* A) Ux bgs) (►u9 00 (ppb) (Ppb) (ppb) (Ppb) (ppb) (Ppb) <br /> EXPLANATION. <br /> Ground%�ater monitoring data and laboratory analytical results prior to March 9, 1998,were compiled from reports prepared by MPDS Services,Inc <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene --=Not Measured/Not Analyzed <br /> (ft}=Feet E=Ethylbenzene (D)=Duplicate <br /> S I =Screen Interval X=Xylenes <br /> (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> (msi)=Mean sea level <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> TOC elevations have been surveyed relative to Benchmark marked"IS-9"in monument box at San Joaquin and Oak Streets,(Elevation= 10 523 feet,msl) <br /> Site re-surveyed on February 10, 1999 by Field Designs TOC elevations were surveyed on November 16,2000,by Virgil Chavez Land Surveying using <br /> the previous Benchmark <br /> I Laboratory reported the hydrocarbons detected did not appear to be gasoline <br /> Z Laboratory report indicates gas and unidentified hydrocarbons<C7 <br /> 3 M FBE by EPA Method 8260 <br /> 4 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 5 Laboratory report indicates gasoline C6-C12 <br /> 6 Laboratory has identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 ppb in the smle collected from this well <br /> 24004209-1 <br />