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Table 1` <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#2859 <br /> { 1665 Pacific Avenue <br /> Stockton,California <br /> EXPLANATION& <br /> Groundwater monitoring data and laboratory analytical results prior to,March b, 1998,were compiled from reports prepared by MPDS Services,inc <br /> I j <br /> TOC=Top of Casing B=Benzene EB=Equipment Blank <br /> (ft)=Feet F=Toluene (ppb)=Parts per billion <br /> DTW=Depth to Water E=Ethylbenzene ND=Not Detected <br /> GWE=Groundwater Elevation jl �X=Xylenes (D)=Duplicate <br /> msl =Mean sea level <br /> ( ) j MTBE=Methyl tertiary butyl ether --=Not MeasuredMot Analyzed <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline { <br /> * TOC elevations have been surveyed relative to mean sea level On February 10, 1499,TOC measurements were re-surveyed relative to City of Stockton BM#24, <br /> located in monument box at the northwest corner of Pacific Avenue and Harding Way,(Benchmark Elevation=9 71 feet,NGVD29) <br /> On June 31,2001,the following wells were surveyed MW-4,MW-6 {and MW-1 i through MW-14 using the previous benchmark <br /> Laboratory report indicates the hydrocarbons detected appeared to be aIgasoliine and non-gasoline mixture <br /> Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> 3 Detection limit raised Refer to analytical reports <br /> MTBE by EPA Method 8260 l! <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only 1, <br /> R Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 9 Laboratory report indicates discrete peaks �I f <br /> ry Laboratory report indicates gasoline C6-C12 <br /> I Laboratory report indicates weathered gasoline C6-C12 { <br /> iz Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel <br /> 13 Laboratory report indicates the result was reported with a high bias due to the�continuing calibration verificcation falling outside acceptance criteria <br /> i <br /> ANALYTICAL METHODS, <br /> EPA Method 8015 for TPH-G h �� <br /> EPA Method 8020 for BTEX and MTBE(except where noted) <br /> EPA Method 8260 for MTBE(except where noted) 5 <br /> I <br /> 2859 x1s154 As8116102 j <br />