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I Table 1 I Groundwater Monitoring Data and Analytical Results FonnerliUnocal Service Station#0187 437 East Miner Avenue I , Stockton,California r EXPLANATIONS �; I Groundwater monitoring data and laboratory analytical results prior to Maich 9, 1998,were compiled from reports prepared by MPDS Services,inc TOG=Top of Casing 1, TPH- G=!Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion (ft)=Feet B=i�Benzene i --=Not Measured/Not Analyzed DTW=Depth to Water T=1F oluene (D)=Duplicate S 1 =Screen interval t E='Ethyllienzene QA=Quality Assurance/Trip Blank (ft bgs)=Feet Below Ground Surface " X I Xylenes GWE=Groundwater Elevation ij MTBE=Methyl tertiary butyl ether (msl)=Mean sea level l � — * TOC elevations have been surveyed relative to Benchmark marked"15-9"in monument box at San Joaquin and Oak Streets,(Elevation 10 523 feet,ms]) Site re-surveyed on February [0, 1999 by Field Designs TOC�selevations were surveyed on November 16,2000,by Virgil Chavez Land Surveying using n , the previous Benchmark GWE corrected due to the presence of free product, correction factor L(D FW-TOC)+(Product Thickness x 0 75)] Laboratory reported the hydrocarbons detected appeared to be'a gasoline and non-gasoline mixture z Laboratory reported the hydrocarbons detected did not appear to be gasoline Laboratory has identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 ppb in the sample collected from this well i " MTBE by EPA Method 8260 S Laboratory report indicates gas and unidentified hydrocarbons<U/ 6 Laboratory report indicates discrete peak C6 I 7 Laboratory report indicates unidentified hydrocarbons C6-C121 ! _ 9 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 9 Well development performed i1 10 Laboratory report indicates gasoline C6-C12 + I Laboratory report indicates weathered gasoline C6-C12 i2 Detection limit raised Refer to analytical reports 13 Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons<C6 It Il 14 Laboratory report indicates gasoline C6-Cl2+unidentified hydrocarbons C6-C)2 ' isDetection limit raised due to high levels of non-target compounds Refer toanalyticalreports H sl 16 P Sample collected from bottom of well using discrete bomb sampler at 114 feet 17 Sample collected from bottom of well using discrete bomb sampler at 69 feet ! to Well development not completed DTW only j 19 Sample collected at the top of water column using a disposable baffle! I' As6/03 0187 xls/ 45 ' I I.