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Ta*ndGroundwater Monitoring Analytical Results <br /> Chevron Service Station 49-3232 <br /> 8660 Lower Sacramento Road <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to lune 22,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> TOC=Top of Casing TPH-G="Total Petroleum Hydrocarbons as Gasoline MTBF=Methyl tertiary butyl ether <br /> (ft)=Feet B=Benzene (ppb)=Parts per billion <br /> GWS—Groundwater Elevation <br /> T=Toluene --=Not Mea-sured/Not Analyzed <br /> (ms])=Mean sea level E=Ethylbenzene QA=Quality Assurance/Trip Blank <br /> DTW=Depth to Water X=Xylenes NP=No Purge <br /> * TOC elevations were resurveyed in April of 2002 by Morrow Surveying Elevations are based on San Joaquin County Benchmark No IN-6 Brass dish <br /> in well at Thornton and Davis Roads(Benchmark Elevation= 14 43 feet) <br /> ` TOC elevation changed due to well head maintenance <br /> 2 MTBE by EPA Method 8260 <br /> 3 Laboratory report indicates gasoline C6-C12 <br /> Laboratory report indicates unidentified hydrocarbons C6-C 12 <br /> 5 TOC has been altered <br /> 6 Well development performed <br /> 7 BTEX and MTBE by EPA Method 8260 <br /> 8 TOC was incorrectly presented as 13 73 feet in previous report GWE has been updated <br /> 9-3232 xls/tl386463 7 As of 07/09/04 <br />