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in9 •Groundwater Monitoring and Analytical Results <br /> Former 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 <br /> =Benzene (ppb)=Parts per billion <br />� T=Toluene ND=Not Detected <br /> (ft)=Feet E=Ethylbe (D)=Duplicate <br /> nzene <br /> DTW=Depth to Water X=Xylenes --=Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation QA=Quality Assurance/Trip Blank <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether <br /> EB=Equipment Blank <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> TOC elevations have been surveyed relative to mean sea leve! On February 10, 1999,TOC measurements were re-surveyed relative to City of Stockton BM#24, <br /> located m 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 /> I Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> Z Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> ' Detection limit raised Refer to analytical reports <br /> MTBE by EPA Method 8260 <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-CI 2 <br /> 6 Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only <br /> e Laboratory report Indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 4 Laboratory report indicates discrete peaks <br /> 10 Laboratory report indicates gasoline C6-C 12 <br /> E1 Laboratory report indicates weathered gasoline C6-C12 <br /> iz <br /> Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested e <br /> ii Laboratory report indicates the result was reported with a high bias due to the continuing calibration venficcation falling outside acceptance criteria <br /> i4 Laboratory report indicates gasoline C6-C10 <br /> 15 Laboratory report indicates discrete peak cr C7 <br /> ANALYTICAL METFFODS <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 /> 1 <br /> As of 42/28/03 <br /> 2859 x191#280054 21 <br />