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PLATES II , III, IV, V, & VI show lines of equal concentration of <br /> benzene, ethylbenzene, toluene, xylene, & TPHg based upon the <br /> 6/24/1997 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" . Although there is some variation in the levels of <br /> measured substances compared to the March sampling, the shape of <br /> the plume has not changed significantly This suggests that <br /> there is little horizontal movement occurring, and that the plume <br /> is relatively stable <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 /> 3 There is some evidence that natural attentuation may be <br /> taking place, although more data will be needed to verify that <br /> process . <br /> An approved workplan for placing six (6) strataprobe points to <br /> the north, east, & south of the site in an attempt to locate the <br /> "zero" line of the groundwater plume has been submitted to the <br /> State Cleanup Fund staff for review and approval To date our <br /> client has not received a response to that request When <br /> approval is received, the required permits will be obtained and <br /> the work sch duled <br /> WOVRWQCB <br /> er & Associates <br /> Calentine ���WED 6FO/ <br /> WL�uW J HUZER <br /> CXpI re's <br /> >/47 <br /> NO SFA <br /> -or NO <br /> CAS-�F���P <br /> N � <br /> 2 <br />