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Table 1 Groundwater Monitoring Data and Analytical Rerults ' FI rmer Unocal Service Station 02859 11 �I 1665 Pacific Avenue 1, II �I Stockton,California EXPLANATIONS �f i I Groundwater monitoring data and laboratory analytical results prior to Marchl6 1998 we re compiled from reports prepared by MPDS Services,Inc I TOC=Top of Caging B=Benzene EB=Equipment Blank (ft)=Feet T=To 11 (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 1, r TQC elevations have been surveyed relative to mean sea level Oil n 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 andHarding Way,(Benchmark Elevation=9 71 feet,NGVD29) On June 11,2001,the following wells were surveyed MW-4,MW-6 and MW-1� 1 through MW-14 using the previous benchmark i 1 11 Laboratory report indicates the hydrocarbons detected appeared to be a gasolmf and non-gagoline mixture Z Laboratory report indicates the hydrocarbons detected did not appear to{be gasoline ' Detection limit raised Refer to analytical reports MTBE by EPA Method 8260 s Laboratory report indicates unidentified hydrocarbons C6-C12 F Laboratory report indicates gasoline and unidentified hydrocarbons>C8 7 Well development only i G RI� Laboratory report indicates gasoline and unidentified hydrocarbons C6-Cl 2 9 Laboratory report indicates discrete peaks 10 Laboratory report indicates gasoline C6-C12 n Laboratory report indicates weathered gasoline C6-C12 I It � li ANALYTICAL METHODS I I EPA Method 8015 for TPH-G ! I EPA Method 8020 for 13TEX and MTBE(except where noted) l EPA Method 8260 for MTBE(except where noted) j I I Ag o7/0t 2959 xls!#28t}054 I 17• ., I