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• _ F � r <br /> •, e:t' � � .-.ti. � -�^ y. � :- s �� ..� ,.- . ,t .�. r of� `fix a. A. <br /> i <br /> 1. H. KLEINFELDER &ASSOCIATES <br /> 4 3 <br /> File No. W-3005-1 <br /> December 2, 19x5 <br /> Page 6 <br /> V. DISCUSSION <br /> The analytical results of MW-1 do not suggest that the concentration of chemical <br /> compounds detected in the wells originate from the 1,000 gallon tank location. The <br /> analytical results of soil samples taken from 40 feet in boring B-3 (MW-4) should not <br /> be construed as indicating that the source of the chemicals detected in MW-4 is in the <br /> area of boring B-3. This sample is taken from the capillary fringe and is most likely <br /> representing concentrations of hydrocarbons trapped in the upper aquifer by capillary <br /> forces. This interpretation is supported by the lack of observed odors in shallow <br /> samples collected from the same bore hole. �� ? f._It n ��ic�f`S. ;.t J{ <br /> The analytical results from BMW-3 and MW-4 do show that' hydrocarbon and <br /> _M particularly the BTX components are present in ground water above current State <br /> action levels. The source of these compounds can not be located by the available <br /> -� data. The 1,000 gallon tank excavation did not contain concentrations of the chemical <br /> compounds sufficient to account for the concentrations' detected in ,MW-3 and MW-4. <br /> In addition, the County inspector verified the absence of obvious hydrocarbons in the <br /> larger tank excavation and therefore, it is possible the source of the chemical <br /> compounds in MW-3 and MW-4 could be from an upgradient off-site location. Two <br /> additional upgradient wells at the property edge and one additional downgradient well <br /> Wshould be installed to assess whether these compounds are due to an unknown on-site <br /> or off-site source. <br /> If one or more of the upgradient wells contain similar or higher concentrations of <br /> the chemical compounds, the County can utilize this data to investigate other potential <br /> sources. If the upgradient wells contain statistically lower concentrations of chemical <br /> compounds, a separate unknown on-site source may be indicated. In such a case, <br /> Geweke should request assistance from the County to pursue assessment of the <br /> �i <br />