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u <br /> Table 1 <br /> ` Groundwater Monitoring Data and Analytical Results <br /> Formed Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> EXPLANATIONS. E �' <br /> t _ <br /> Groundwater monitoring data and laboratory analytical results priorto March 9; 1998,were compiled from reports prepared by MPDS Services,Inc - <br /> I fl _ <br /> TOC=Top of Casing elevation B`=Benkne ppb=Parts per billion r <br /> DTW=Depth to Water T,=Toluene - r --=Not Measured/Not,Analyzed <br /> (ft)=Feet 1 E E=Ethylbenzene (D) = Duplicate " <br /> GWE=Groundwater Elevation X Xylenes - <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline MTBE Methyl tertiary butyl ether, <br /> * TOC elevations have been surveyed relative to Benchmark marked"IS-9" m monument box at San Joaquin _ <br /> and Oak Streets (Elevation= 10 523 feet,City Datum) Site re-surveyed onTebruary 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 gasoline and non-gasoline mixture s <br /> xLaboratory reported the hydrocarbons detected did not appear to'be gasolinet _ _ <br /> 3 Laboratory has identified the presence of MTBE at a level above or equal tolthe taste and odor threshold of 40 ppb in the sample collected from this well _ - <br /> a MTBE by EPA Method 8260 i = <br /> s Laboratory report indicates gas and unidentified hydrocarbons<C7 <br /> e Laboratory report indicates discrete peak C6 # �, ! <br /> Laboratory report indicates unidentified hydrocarbons C6-C 12 <br /> s Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12i�� <br /> 9 Well development only <br /> Laboratory report indicates gasoline C6-C12 TM IF _ <br /> Laboratory report indicates weathered gasoline C6-C l2 ij � _ - ■ <br /> ANALYTICAL METHODS. <br /> EPA Method 8015 for TPH(G) - <br /> EPA Method 8020 for BTEX and MTBE except where noted ! - <br /> EPA Method 8260 for MTBE where noted a - <br /> i - <br /> s <br /> 0187 xis5 - f r - _ As 0/24/99 <br />