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in levels since monitoring began. <br /> 4 _ The three new monitoring wells which were placed in August, <br /> 1994 are shown on EXHIBIT A. The laboratory results of the two <br /> water sampling events on those wells, shown on TABLE I , show that <br /> MW--5 appears to have defined the limits of TPH-G & Ethylbenzene, <br /> and is very close to the "zero" lane for benzene, toluene, & <br /> xylene. <br /> 5_ MW-6, at the northeast edge of the property, measured minor <br /> amounts of benzene, toluene, & xylene, ethylbenzene is below <br /> detection limits in both sampling events. TPH-G was detected in <br /> both samples. <br /> 6 . The water samples from MW-7, located at the southerly end of <br /> the site, revealed benzene, toluene, ethylbenzene & TPH-G from <br /> the August sampling, but were below detection limits for all <br /> compounds from the December event. The reason for that large <br /> difference is not known. <br /> CONCLUSIONS- <br /> Based upon the data obtained to date, the following conclusions <br /> are offered: <br /> 1 . The lateral extent of the groundwater plume appears to be <br /> have been fairly well defined to the west & southwest, based on <br /> results from MW-5 & MW-7. It has not yet been fully defined to <br /> the north & east of the property, and appears to extend beyond <br /> the site to the southeast, beneath US Chemical_ EXHIBITS B & C <br /> show lines of equal concentrations of benzene & TPH-G an the <br /> groundwater based upon the latest laboratory results. They both <br /> continue indicate that the plume extends beneath the US Chemical <br /> site_ <br /> 2_ The groundwater gradient as measured has been consistently an <br /> a southerly direction, which does not agree with either the <br /> regional gradient or data from nearby monitoring wells located <br /> southeast of the property. We are presently negotiating with US <br /> Chemical Co. to measure water depths and obtain samples from the <br /> four wells on their property. You will be notified when that <br /> work is scheduled. <br /> 3 The limits of soil contamination appear to have been defined <br /> in all directions. Monitoring wells #5, 6, & 7 dad not reveal <br /> any contamination in soil samples, which provides a "zero" line <br /> to the northwest, southwest, & south. Monitoring wells #1 , 2, 3 , <br />• & 4 dad show some contamination an soil samples at 51 ' bgl & <br /> 2 <br />