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Tab ' <br /> i Groundwater Monitoring qV <br /> 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,iiic <br /> B=Benzene (ppb)=Parts per billion <br /> TOC=Top of Casing ND=Not Detected <br /> (ft)=Peet T=Toluene <br /> E=Ethylbenzene (D)=Duplicate <br /> DTW=Depth to Water =Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation X=Xylenes <br /> (msq=Mean sea level <br /> MTBE=Methyl ternary butyl ether QA=Quality Assurance/Tnp 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#24, <br /> located in monument box at the northwest corner of Pacific Avenue and Harding Way,(Benchmark Elevation=9 71 feet,NGVD29) <br /> On June 11,2001,the following wells were surveyed MW-4,MW-6 and MW-11 through MW-14 using the previous benchmark <br /> ' Laboratory report indicates the hydrocarbons detected appeared to he a gasoline and non-gasoline mixture <br /> 2 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 /> ` Laboratory report indicates unidentified hydrocarbons C6 02 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only <br /> it Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 9 Laboratory report indicates discrete peaks <br /> in Laboratory report indicates gasoline C6-C12 <br /> 'i 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 requested fuel <br /> 11 Laboratory report indicates the result was reported with a high bias due to the continuing calibration venticcation falling outside acceptance criteria <br /> 14 <br /> Laboratory report indicates gasoline C6-CiO <br /> ii 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 /> i <br /> 2859 xis/#280054 21 As of 11/09/02 <br />