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Tabl 90 ingD Groundwater Monitoring Da d Analytical Results Former Unocal Service Station#2859 1665 Pacific Avenue Stockton,California EXPLANATIONS Groundwater monitoring data and laboratory analytical results prior to March 6, 1998,were compiled from reports prepared by MPDS Services,inc TOC=Top of Casing B=Benzene EB=Equipment Blank (ft)=Feet T=Toluene (ppb)=Parts per billion DTW=Depth to Water E=Ethylbenzene ND=Not Detected GWE=Groundwater Elevation X=Xylenes (D)=Duplicate (msl)=Mean sea level MTBE=Methyl tertiary butyl ether =Not Measured/Not Analyzed TPH-G=Total Petroleum Hydrocarbons as Gasoline 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, 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 and MW-11 through MW-14 using the previous benchmark Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture 2 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline I Detection limit raised Refer to analytical reports MTBE by EPA Method 8260 5 Laboratory report indicates unidentified hydrocarbons C6-Cl2 F Laboratory report indicates gasoline and unidentified hydrocarbons>C8 7 Well development only A Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 9 Laboratory report indicates discrete peaks 10 Laboratory report indicates gasoline C6-C12 I Laboratory report indicates weathered gasoline C6-C12 ANALYTICAL METHODS EPA Method 8015 for TPH-G EPA Method 8020 for BTEX and MTBE(except where noted) EPA Method 8260 for MTBE(except where noted) 2859 xis/#280054 17 As of 06/06/01