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SUMMARY OF GROUND-WATER MONITORING DATA <br /> Fourth Quarter 1992 <br /> ARCO Service Station #548 <br /> 1612 Hammer Lane, Stockton <br /> (micrograms per liter(ugR) or parts per billion (ppb) <br /> Floating <br /> Well 1D Depth to Product Total TPH as <br /> and Sample Sampling Water Thickness Benzene Toluene Ethylbenzene Xylenes Gasoline <br /> Depth Date (feet) (feel) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1 (56) 1214192 48.83 - - 7.0 ND ND ND 150` <br /> MW-2(61) 1214192 48.35 - ND ND ND ND ND <br /> MW-3(62) 1214192 48.30 - - ND ND ND ND X150" <br /> MW-4(63) 1214192 49.73 - - ND ND ND ND ND <br /> TPH=Total petroleum hydrocarbons <br /> ND=Not detected <br /> `=The sample contains a lower boiling point hydrocarbon mixture quantitated as gasoline. <br /> The chromatogram does not match the typical gasoline fingerprint. <br /> `" = Raised MRL due to matrix interference. <br /> The sample contains a single non-fuel component eluting in the gasoline range. <br /> Sampling Doc.OG71-033.01 <br /> 1 <br />