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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> EXPLANATION& ; <br /> Groundwater monitoring data and laboratory analytical results prior to March 9, 1998,were compiled from reports prepared by MPDS Services,Inc <br /> TOC=Top of Casing elevation { B=Benzene ppb=Parts per billion <br /> DTW=Depth to Water T Toluene --=Not Measured/Not Analyzed <br /> (ft)=Feet E Ethylbenzene (D) = Duplicate <br /> GWE=Groundwater Elevation X`Xylenes <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline MTBE=IlMethyl tertiary butyl ether <br /> * TOC elevations have been surveyed relative to Benchmark marked"IS 19 " in monument box at San Joaquin <br /> and Oak Streets (Elevation=10 523 feet,City Datum) Site re-surveyed on February 10, 1999 by Field Designs <br /> ** Groundwater elevation corrected due to the presence of free product,correction factor=[(DTW-TOC)+(Product Thickness x 0 75)] <br /> ' Laboratory reported the hydrocarbons detected appeared to be a gasoli 1 e and non-gasoline mixture <br /> 2 Laboratory reported the hydrocarbons detected did not appear to be gasoline I <br /> 3 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 <br /> 4 MTBE by EPA Method 8260 " I' <br /> 5 Laboratory report indicates gas and unidentified hydrocarbons<C7 <br /> 6 Laboratory report indicates discrete peak C6 <br /> i <br /> Laboratory report indicates unidentified hydrocarbons C6-Cl2 <br /> $ Laboratory report indicates gasoline and unidentified hydrocarbons C6 C12 II <br /> 9 Well development only <br /> 19 Laboratory report indicates gasoline C6-Cl2 <br /> " Laboratory report indicates weathered gasoline C6-C12 <br /> li <br /> 12 Detection limit raised Refer to analytical reports li <br /> i3 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6 <br /> 1 11 <br /> M Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons C6-C12 <br /> f5 Detection limit raised due to high levels of non-target compounds Refer to analytical reports <br /> ANALYTICAL METHODS, C <br /> r <br /> EPA Method 8015 for TPH(G) k <br /> EPA Method 8020 for BTEX and MTBE except where noted I <br /> EPA Method 8260 for MTBE where noted <br /> f ` <br /> i <br /> �I <br /> 0187 xls 5 As 23/00 <br />