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I <br /> Iof the former UST cavity However, small concentrations of toluene and xylenes are present <br /> at a depth of 45 feet <br /> No petroleum hydrocarbons were detected in soil samples from MW-3 or MW-4. However, <br /> low concentrations of petroleum hydrocarbons were detected in MW-1 at a depth of 45 feet. <br /> The impacted soil appears to be limited to the area immediately around the former UST <br /> excavation (perhaps a 20 foot radius). <br /> Remediation well VW-1 was installed for the purpose of soil remediation. The well can be <br /> utilized for several remediation methods including vapor extraction and bioremediation. We <br /> recommend the preparation of an Interum Soil Remediation Plan, discussing possible <br /> remediation methods <br /> I5.2 Hydrocarbon Impacted Groundwater <br /> TPH as gasoline and toluene have been detected intermittently in MW-2 since January of <br /> 1993. However, relatively low concentrations of benzene have been detected in MW-2, <br /> I MW-3 and MW-4 for three consecutive monitoring events No toluene, ethylbenzene or <br /> xylenes have been detected in MW-3 or MW-4 <br /> In October 1993 and January 1994, MW-3 was the down-gradient well However, the <br /> gradient has shifted to the southeast and MW-4 is now the down-gradient well The gradient <br /> at the site has vaned from northeast to southeast over the past three monitoring events. It <br /> is uncertain whether the shift in groundwater flow direction is the result of seasonal changes <br /> or localized agricultural or domestic water well pumping <br /> GeoAudrt recommends continued quarterly monitoring concurrent with interim soil <br /> remediation The next quarterly monitoring should be scheduled by July 1994 <br /> I <br /> 6.0 LIMITATIONS <br /> I <br /> Our professional services were performed using that degree of care and stall ordinarily <br /> I exercised by environmental consultants practicing in this or similar localities The findings <br /> were mainly based on analytical results provided by an independent laboratory Evaluations <br /> of the geologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points (i a monitoring wells) and subsurface conditions <br /> may vary away from these data points No other warranty is made as to the professional <br /> Irecommendations contained in this report <br /> I <br /> 9 <br /> M.rlwn.Propc1un QR/4¢µt 75 <br />