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2 The levels of TPH-G have remained low and fairly constant in <br /> all of the wells , which would not be unexpected from a site which <br /> has been inactive for many years However, those levels are not <br /> consistent with the very high levels of BTEX encountered <br /> 3 The highest levels of comtaminants have been measured in <br /> monitoring well #1 , which is the farthest from the site of the <br /> removed tanks , and has been in a down-gradient position only <br /> during the last two sampling events As can be seen when com- <br /> paring the lab results on TABLE I with the measured gradients on <br /> F-LAU I , there is no direct correlation between the two sets of <br /> data <br /> 4 Monitoring well #3 , although closest to the removed UST' s , <br /> and never in a down-gradient position, has revealed significant <br /> levels of BTEX each time it was sampled, again, there is no <br /> apparent correlation between the levels measured and the indi- <br /> cated groundwater gradient <br /> 5 Monitoring well #2 has consistently recorded the lowest <br /> levels of all components It was in a down-gradient <br /> ro <br /> during the April & July samplings , but not in Novembeortian <br /> January Although there is no obvious correlation between <br /> amounts of contamination measured & the gradient direction, the <br /> highest levels detected were in July, when the well was directly <br /> down-gradient <br /> CONCLUSIONS <br /> Based on data obtained to date, the following conclusions appear <br /> justified, <br /> 1 The evidence for an offsite source of contamination discussed <br /> in prior reports is still indicated by the latest data, although <br /> it' s location is not as easily defined The soil-vapor survey <br /> which is being conducted on the property may assist in identify- <br /> ing the direction of that source <br /> 2 Laboratory analysis (EPA 501 , ) of water samples from the <br /> latest test were below detection limits, which supports the <br /> evidence for a gasoline derived source of the contamination <br /> 3 Soil remediation at this time is not justified until the <br /> additional source, or sources , of contamination have been <br /> identified, and the vertical and horizontal limits of the plume <br /> have been fully defined <br /> 2 <br />