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Table 1 11 Groundwater Monitoring Data and Analytical Results k Chevron Service Station#9-8264- { - s I, 3775 Tracy Boulevard �i Tracy,California t , EXPL,ANATiONS - ! Groundwater monitoring data and laboratory analytical results prior to Ma§ 18,2000,were compiled from reports prepared by Blaine Tech Service,,inc TPH-G=Notal Petroleum Hydrocarbons as Gasoline SVOCs=Semivolatile Organic Compounds r TOC=Top of Casing VOCs=Volatile Organic Compounds - (ft)= Feet B=Benzene - I I GWE=Groundwater Elevation = T Toluene (ppb)=Parts per billion i E!� Ethy 4benzene - ! --=Not Measure d/Not Analyzed (ms!)=Mean sea level QA -Quality Assuranceffrip Blank _ DTW=Depth to Water X Xyl nes r I - SPHT=Separate Phase Hydrocarbon Thickness I MTBE Methyl tertiary butyl ether , TPH-D=Total Petroleum Hydrocarbons as Diesel TOG=Total Oil and Grease 1 { i Chromatogram pattern indicated an unidentified hydrocarbon Ii e � z Insufficient preservative to reduce the sample pH to less than 2 Sample was analyzed within 14 days of sampling,but beyond the 7 days recommended �} r ii I� - , - for-Benzene Toluene and Ethylbenzene- TOC elevation altered due to casing repairs a Laboratory report indicates gasoline C6-Cl2 - s Laboratory report indicates tin identifiedihydrocarbons<C16 ' - - - Diesel data for MW-1 is not available because there was not enough Esample for extraction - Y ' Laboratory report indicates unidentified thydrocarbons C9-C24 11 s MTBE by EPA Method 8260 I, 9 Laboratory report indicates second highest MTBE co centratton was confirmed by 8260 Initial BTEX analysis indicated that this well appeared to D p have the highest MTBE concentration l l 10 Laboratory report indicates discrete peaks BTEX and MTBE by EPA Method 8260 12 Laboratory report indicates the observed sample pattern is not typical of diesel/#2 fuel oil 11 I ` r - ,r t - ti _ it . A127/03 T 9 8264 x*6854 E r