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1 fff <br /> If Table 1 <br /> Groundwater Monitoring Data and Analytical Results - - <br /> Former lJnocal Service Station No 2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> EXPLANATIONS ° <br /> Groundwater monitoring data and laboratory analytical results pnor to November 25,2003,were compiled from_reports prepared by Gettler-Ryan, Inc - <br /> �E r <br /> TOC=Top of Casing BI= Benzene (ug/L)= Micrograms per Liter <br /> (ft = Feet 3 r Toluene ND=Not Detected <br /> ir <br /> DTW = Depth to Water ' s Ei= Ethylbenzene (D)= Duplicate _ <br /> GWE= Groundwater Elevation X=Xylenes T= Not Measured/Not Analyzed _ <br /> (rnsl)= Mean sea level MtBE= Methyl tertiary butyl ether QA=Quality AssurancelTnp Blank <br /> TPHg=Total Petroleum Hydrocarbons as Gasoline 1� EB=Equipment Blank - - <br /> � IG - <br /> TOC elevations have been surveyed relative to mean sea11level On February 10, 1999,TOC measurements were re-surveyed relative to City of Stockton BM#24, <br /> located in monument box at the northwest comer of Pacific Avenue and Harding Way,(Benchmark Elevation=9 71 feet, NGVD29) - <br /> On June 31,2001,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 tope a gasoline and non-gasoline mixture t - <br /> 2 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline _ <br /> 3 Detection limit raised Refer to analytical reports ao <br /> 4 MTBE by EPA Method 8260 b _ <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates gasoline and unidentified hydrocarbons>1C8 - - <br /> Well development only ; II <br /> e Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 r <br /> s Laboratory report indicates discrete peaks - <br /> 10 Laboratory report indicates gasoline C6-C12 t <br /> 11 Laboratory report indicates weathered gasoline C6-C12 it 1 <br /> 12 Laboratory report indicates hydrocarbon pattern is present in tf{re requested fuel quantitation range, but does not resemble the pattern of the requested fuel <br /> 13 Laboratory report indicates the result was reported with a high bias due to the continuing calibration verification falling outside acceptance cntena - <br /> 14 Laboratory report indicates gasoline C6-C10 <br /> 15 Laboratory report indicates discrete peak @ C7 <br /> 16 Current laboratory analytical results to not coincide with historical data, and although the laboratory results were confirmed,it appears that the samples were switched <br /> ,7 <br /> 11 <br /> Laboratory report indicates discrete peak @ non-target @13 RT ` <br /> 18 Laboratory report indicates discrete peak @ non-target @9 37 RT <br /> 'g Analyte was analyzed by GCMS Method 8260B <br /> 0694006940-310 �I 2g 0 ENSR Cation <br /> 1 � ` <br />