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1 <br /> PLATE XII shows lines of equal concentration of benzene based on <br />' the latest data It reveals that contamination is increasing to <br /> the east & southeast, roughly in the direction of groundwater <br /> flow. The limits have not been defined in any direction <br />' PLATE XIII shows levels of ethylbenzene based on the July <br /> results . MW-3 has the highest levels, with MW-5 next . Again, <br /> the configuration of the plume conforms well with gradient data <br /> All wells had "hits" and no "zero" line has been established <br /> PLATE XIV shows levels of toluene; MW-3 is highest, with MW-5 <br />' next Agan, the limits of contamination have not been found <br /> PLATE XV, xylene concentrations, again show MW-3 the highest, <br /> with MW-5 next The plume appears to have shifted somewhat to <br />' the southeast, although other interpretations are possible <br /> PLATE XVI shows levels of TPHg, with MW-3 again measuring the <br /> highest levels MW-1 recorded only 3 . 6 mg/L, suggesting it is <br /> close to a "zero" line to the west of the property Levels <br /> measured in MW-2, MW-4, MW-5, & MW-6 varied only from 24 to 36 <br /> mg/L, indicating a fairly symmetrical shape to the plume <br /> PLATE XVII is a schematic fence diagram through the soil borings <br /> and monitoring wells The high levels of contamination found in <br />' soil samples from MW-3 , MW-5, & soil boring "B" may be due in <br /> part to the greater volume of sandy intervals encountered in that <br /> area <br />' CONCLUSIONS <br /> Based on an analysis of all of data collected to date, the <br /> Ifollowing conclusions appear reasonable . <br /> I. The dispensing pumps and/or product lines were a mayor <br /> contributor to the gasoline contamination found beneath the <br /> property This is supported by the fact that the highest levels <br /> of BTEX & TPHg have been measured in MW-3 & MW-5, which are <br /> closest too, and generally downgradient from, the pump island. <br /> 2 The site which contained the gasoline UST' s also was a source <br /> of contamination, but probably not as much as the dispensing <br />' pumps <br /> 3 The limits of soil contamination have not been fully defined, <br /> I but except for MW-3 & soil boring "B" it appears to be confined <br /> to the "smear zone" caused by fluctuations in the potentiometrlc <br /> surface . <br /> 9 <br /> I <br />