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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station 42859 <br /> 1 1665 Pacific Avenue <br /> it Stockton,California <br /> 1 <br /> EXPLANATIONS, <br /> Groundwater monitoring data and laboratory analytical results pnor to Marcfh 6, 199$,v✓ere compiled from reports prepared by MPDS Services,Inc <br /> TOC=Top of Casing B=Benzene EB=Equipment Blank <br /> (R)=Feet T=Toluene (ppb)=Parts per billion <br /> DTW=Depth to Water E=Ethylbelnzene ND=Not Detected <br /> GWE=Groundwater Elevation X=Xylenes (D)=Duplicate <br /> (msl)=Mean sea level ,,MTBE=Methyl tertiary butyl ether Not Measured/Not Analyzed <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline If 11 i <br /> * TOC elevations have been surveyed relative to mean sea level On Fe iruaryj`l 0, 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 /> 1 11 <br /> On June 31,2001,the following wells were surveyed MW-4,MW-6 and MW-I 1 through MW-14 using the previous benchmark <br /> ' Laboratory report indicates the hydrocarbons detected appeared to be 'gasollme and noxi-gasoline mixture <br /> 2 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> s Detection limit raised Refer to analytical reports <br /> MTBE by EPA Method 8260 <br /> s Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> ' <br /> Well development only IL <br /> a Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> v Laboratory report indicates discrete peaks <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> I Laboratory report indicates weathered gasoline C6-C12 1 <br /> 1 j <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 /> i3 Laboratory report indicates the result was reported with a high bias due to thy!continuing calibration venficcation falling outside acceptance criteria <br /> � { t <br /> ANALYTICAL METHODS. j <br /> EPA Method 8015 for TPH-G j <br /> EPA Method 8020 for 13TEX and MTBE(except where noted) 1 <br /> EPA Method 8260 for MTBE(except where noted) { <br /> 2859 x1054 �� �� AID/17101 <br />