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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Chevron Facility#306620 <br /> (Former Unocal #5098) <br /> 5606 Pacific Avenue <br /> Stockton,California <br /> EXPLANATIONS: <br /> Groundwater Monitoring data and laboratory analytical results prior to January 26,2007,were complied from reports prepared by ENSR Corporation. <br /> TOC=Top of Casing B=Benzene ND=Not Detected <br /> (ft.)=Feet T=Toluene --=Not Measured/Not Analyzed <br /> DTW=Depth to Water E=Ethylbenzene (D)=Duplicate <br /> GWE=Groundwater Elevation X=Xylenes SPH=Separate Phase Hydrocarbons <br /> (msl)=Mean sea level MTBE=Methyl Tertiary Butyl Ether QA=Quality Assurance/Trip Blank <br /> SPHT=Separate Phase Hydrocarbon Thickness (pg/L)=Micrograms per liter <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> * The elevations of all wells were surveyed to City of Stockton Benchmark No. 14(elevation=10.95 MSL). <br /> Elevations surveyed by Morrow Surveying on December 16,2004. Elevations are surveyed to City of Stockton benchmark No. 14. <br /> Elevations surveyed by Morrow Surveying on August 26,2004. Elevations are surveyed to City of Stockton benchmark No. 14. <br /> A Well was resurveyed on 6/24/98. <br /> B Elevation surveyed by Morrow Surveying on October 15,2005. Elevations are surveyed to City of Stockton benchmark No. 14. <br /> 1 Although sample contains compounds in the retention time range associated with gasoline,the chromatogram was not consistent with the expected chromatographic pattern <br /> or fingerprint. However,the reported concentration is based on gasoline. <br /> Z Samples collected on August 31,2004 were subsequent to well development. <br /> Sample reported by laboratory as weathered gasoline. <br /> 4 MW-28 was resampled on October 27,2005 as a result of gasoline,acetone,and 2-Butanone reported in sample collected on October 11,2005. <br /> 5 MW-23S and MW-23D were resampled on November 9,2005 as a result of gasoline(in MW-23S only),acetone,and 2-Butanone reported in samples collected on October 11,2005. <br /> Results from the November 9th event were below laboratory reporting limits for all analytes. <br /> 6 The surrogate recovery for this sample is outside of established control limits due to a sample matrix effect. <br /> 7 MW-9R and MW-10 were resampled on February 9,2006 as a result of TPI-Ig and VOC concentrations reported in samples collected in January of 2006. <br /> 8 The method blank contains analyte at a concentration above the MRL; <br /> however,concentration is less than 10%of the sample result,which is negligible according to method criteria. <br /> 9 The reported concentration of TPH-GRO does not include MTBE or other gasoline constituents eluting prior to the C6(n-hexane). TPH-GRO range start time. <br /> 10 BTEX and MTBE by EPA Method 8260. <br /> 11 Laboratory report indicates estimated value. <br /> NOTES: <br /> Wells MW-1 through MW-7 are owned by Montgomery Ward and are located on 5400 Pacific Avenue. Depth to ground water measurements for these wells were obtained <br /> by Environmental Audit,Inc. <br /> Wells MW-10 through MW-17 are owned by Unocal and are located on 5606 Pacific Avenue. Depth to ground water measurements for these wells were obtained by MPDS Services,Inc. <br /> 306620.xis/#385833 58 As of 01/17/09 <br />