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Te1 <br /> Groundwater Monitori4to and Analytical Results <br /> Fotmer Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 6, 1998,were compiled from reports prepared by MPDS Services,inc <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> (It)=Feet T=Toluene ND=Not Detected <br /> DTW=Depth to Water E=Ethylbenzene (D)=Duplicate <br /> GWE=Groundwater Elevation X=Xylenes --=Not Measured/Not Analyzed <br /> (ms])=Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality Assurancerrnp Blank <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline EB=Equipment Blank <br /> • 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 R24, <br /> located in monument box at the northwest corner of Pacific Avenue and Harding Way,(Benchmark Elevation=9 71 feet,NGVD29) <br /> On lune 31,2001,the following wells were surveyed MW-4.MW-6 and MW-1 I through MW-14 using the previous benchmark <br /> 1 Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> 2 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> 3 Detection limit raised Refer to analytical reports <br /> 4 MTBE by EPA Method 8260 <br /> s Laboratory report indicates unidentified hydrocarbons C6-Cl2 <br /> F Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only <br /> sa Laboratory report indicates gasoline and unidentifed hydrocarbons C6-C12 <br /> 9 Laboratory report indicates discrete peaks <br /> 10 Laboratory report indicates gasoline C6-Cl 2 <br /> ii Laboratory report indicates weathered gasoline C6-C12 <br /> 12 Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the guested fuel <br /> f3 Laboratory report indicates the result was reported with a high bias due to the continuing calibration venficcation falling outside acceptance cntena. <br /> 14 Laboratory report indicates gasoline C6-C 10 <br /> 15 Laboratory report indicates discrete peak @ C7 <br /> ANALYTICAL METHODS. <br /> EPA Method 8015 for TPH-G <br /> EPA Method 8020 for BTEX and MTBE(except where noted) <br /> EPA Method 8260 for MTBE(except where noted) <br /> 2859 x isM280054 21 As of 02128/03 <br />