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�If <br /> Table 1 <br /> i <br /> Groundwater Monitoring Data and Analytical Results- <br /> Former <br /> esults-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 /> r � <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> (ft)=Feet i T=Toluene ND=Not Detected <br /> DTW=Depth to Water E=Ethylbenzene (D)=Duplicate <br /> GWE=Groundwater Elevation l X= Xylenes --=Not Measured/Not Analyzed <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality Assurance <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline f 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 land Ha�rding Way,(Benchmark Elevation=9 71 feet,NGVD29) <br /> On June 31,2001,the following wells were surveyed MW-4,1 MW-'6 and kMW-1 l through MW-14 using the previous benchmark <br /> ' Laboratory report indicates the hydrocarbons detected appeared to bil a gasoline and non-gasoline mixture <br /> z Laboratory report indicates the hydrocarbons detected did not appear to beIgasoline <br /> 3 Detection limit raised Refer to analytical reports <br /> MTBE by EPA Method 8260 I, <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> e Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only 1; II I , u <br /> K Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 9 Laboratory report indicates discrete peaks r <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> ii Laboratory report indicates weathered gasoline C6-C12 <br /> If <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 /> �� it _ I <br /> 13 Laboratory report indicates the result was reported with a high'bias due to the continuing calibration verificcation falling outside acceptance criteria <br /> j4 Laboratory report indicates gasoline C6-C10 <br /> I' <br /> It - <br /> ANALYTICAL METHODS - <br /> EPA Method 8015 for TPH-G �} t <br /> EPA Method 8020 for BTEX and MTBE(except where noted) <br /> EPA Method 8260 for MTBE(except where noted) <br /> 2859 x14L54 A110/02 <br />