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s <br /> PLATES II, III, IV, V, & VI show lines of equal concentration of <br /> benzene, ethylbenzene, toluene, xylene, & TPHg based upon the <br /> 3/27/1997 sampling event They continue to show that the highest <br /> levels of all tested compounds were measured in MW-3, supporting <br /> the prior work which revealed that the area next to the pump <br /> inland had very high levels of contamination in the soil in <br /> Boring "B" <br /> CONCLUSIONS <br /> 1 The dispenser pumps & product lines appear to have been the <br /> mayor contributor of the contamination on the property, although <br /> the UST' s may have been a minor source <br /> 2 Although the limits of the plume have not been fully defined, <br /> there is no evidence of an offsite source <br /> A workplan has been prepared and approved by the County EHD for <br /> placing six (6) strataprobe points to the north, east, & south of <br /> the site in an attempt to locate the "zero" line of the ground- <br /> water plume in those directions It appears that the contamina- <br /> tion may also extend to the west of the property, but it is not <br /> • possible to investigate that area due to the presence of single <br /> family dwellings and insufficient access for the probe truck We <br /> are currently preparing a "pre-approval" package for our client <br /> to submit to the Cleanup Fund The work will be scheduled once <br /> that pro v 1 is received. <br /> Wm J nter & Associates <br /> cc Valentine <br /> RWQCB <br /> g�,D GEp�oCi <br /> W4-7 <br /> 2 <br />