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8 January 1993 <br /> (GeoAudit CV 45-49C5-1. 10) <br /> Page 6 of 7 <br /> CONCLUSIONS <br /> No contamination was detected in soil samples collected from the <br /> I two monitoring wells drilled during this phase of investigation. <br /> There is no evidence of vadose zone contamination in the vicinity <br /> of these borings. <br /> ' The diesel contamination originally reported in the water sample <br /> from MW-3 appears to be erroneous and due to laboratory error, <br /> because this contamination was refuted by the replacement sample <br /> ' (MW-3/1-22-93) . The replacement sample showed no TPH as diesel <br /> contamination. <br /> Both gasoline and diesel were detected in the water sample from MW- <br /> 1 in the June sampling event, but only gasoline was reported in the <br /> November sample. Additionally, benzene and toluene were detected in <br /> the November sampling. <br /> lbThese results confirm that groundwater down-gradient from the <br /> former tank cavity has been impacted by an unauthorized release of <br /> hydrocarbons. The concentrations of gasoline, benzene, and toluene <br /> exceed state action levels. Remediation will probably be required, <br /> but in accordance with state guidelines, PHS/EHD will probably <br /> require that additional monitoring wells be installed to delineate <br /> the contaminant plume before approving a groundwater remediation <br /> plan. <br /> LIMITATIONS <br /> Our professional services were performed using that degree of care <br /> and skill ordinarily exercised by environmental consultants <br /> ' practicing in this or similar localities. The findings were mainly <br /> based on analytical results provided by an independent laboratory. <br /> Evaluations of the geologic conditions at the site for the purpose <br /> of this investigation are made from a limited number of available <br /> data points (i.e. borings) and subsurface conditions may vary away <br /> from these data points. Although soil contamination was not <br /> ' encountered, it could be present in areas not investigated by this <br /> assessment. Therefore, no other warranty, expressed or implied, is <br /> made as to the professional recommendations contained in this <br /> report. <br />