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Table I Groundwater Monitoring Data and Analytical Results 11 Forme Unocal Service Station#2859 1665 Pacific Avenue Stockton, California F EXPLANATIONS Groundwater monitoring data and laboratory analytical results pnor to November 25,2003,were compiled from reports prepared by Gettler-Ryan, Inc TOC=Top of Casing B= Benzene (ug/L)= Micrograms per Liter = 'i (ft) Feet 'y T=Toluene ND= Not Detected 11 DTW = Depth to Water E= Ethylbenzene (D)= Duplicate GWE =Groundwater Elevation X=Xylenes --= Not Measured/Not Analyzed (msl)= Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality Assurance/Trip Blank TPH-G=Total Petroleum Hydrocarbons as Gasoline ! EB= Equipment Blank TOC elevations have been surveyed relative to mean sea level OnFebruary10, 1999,TOC measurements were re-surveyed relative to City of Stockton BM#24, located in monument box at the northwest corner of Pacific Avenue and Harding Way, (Benchmark Elevation=9 71 feet, NGVD29) On June 31,2001,the following wells were surveyed MW-4,+MW-6'aand MW-11 through MW-14 using the previous benchmark ' 11 1 Laboratory report indicates the hydrocarbons detected appeared to II e a gasoline and non-gasoline mixture 2 Laboratory report indicates the hydrocarbons detected did not,appear to be gasoline 3 Detection limit raised Refer to analytical reports 1` 4 MTBE by EPA Method 6260 5 Laboratory report indicates unidentified hydrocarbons C6-C4 s Laboratory report indicates gasoline and unidentified hydrocarbons>C8 7 Well development only 11 1 S Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 9 Laboratory report indicates discrete peaks 10 Laboratory report indicates gasoline C6-C12 11 Laboratory report indicates weathered gasoline C6-C12 t2 Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel 13 Laboratory report indicates the result was reported with a,htgh bias due to the continuing calibration venfication falling outside acceptance criteria 14 Laboratory report indicates gasoline C6-C10 i 15 Laboratory report indicates discrete peak @ C7 16 Current laboratory analytical results to not coincide with histoncal data,and although the laboratory results were confirmed, it appears that the samples were switched 17 i Laboratory report indicates discrete peak @ non-target 613 RT 18 Laboratory report indicates discrete peak @ non-target @9 371 RT I i '