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5.0 CONCLUSIONS <br /> 5.1 Soil Contamination <br /> No hydrocarbons were evident in unsaturated soil samples from MW-4 However, <br /> hydrocarbons were detected at very low levels in soil samples from the saturated zone at <br /> depths of 40 and 45 feet According to RESNA's Interim Problem Assessment Report, soil <br /> contamination was also detected in all three of the other wells between 20 and 55 feet <br /> Neither the full extent of the contamination, nor the average concentrations of specific <br /> hydrocarbons can be confidently estimated with the present data, but it appears that an area <br />' measuring at least 100 feet by 50 feet, with a thickness of approximately 30 feet (I e X5,000 <br /> cu yds ) may be contaminated <br />' 5.2 Groundwater Contamination <br /> Water samples obtained in previous monitoring events indicate that groundwater is <br />' contaminated to the north, west and south of the tank cavity The present investigation has <br /> revealed that the groundwater contamination also extends down-gradient to the east beyond <br /> MW-4 The extent of the contamination plume has not been delmeated, but it probably <br />' extends off-site to the not theast <br /> 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br />' exercised by environmental consultants practicing in this or similar localities The findings <br /> were based upon analytical results provided by an independent laboratory Evaluations of <br /> the geologic/hydrogeologic conditions at the site for the purpose of this investigation are <br />' made from a limited number of available data points (i a monitoring wells, soil samples) <br /> and subsurface conditions may vary away from these data points No other warranty, <br /> expressed or implied, is made as to the professional recommendations contained in this <br />' report <br /> 1 <br /> 9 <br /> 1 <br />