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Project No 034-98081 <br /> Page No 6 <br /> 60 CONCLUSIONS <br /> Based on data obtained from field and laboratory investigations, coupled with information regarding <br /> previous investigations, the following conclusions have been derived <br /> I Soils beneath the subject site consist of sandy silt, clayey silt, silty clay, and silty sand <br /> from grade to a depth of approximately 52 feet below grade, the maximum depth of the <br /> monitoring well soil borings <br /> 2 Soil samples submitted from the capillary fringe from each of the monitoring well <br /> borings did not contain detectable concentrations of TPH-G or BTEX <br /> 3 Depth to groundwater beneath the subject site was determined from the October 2, 199$ <br /> sounding at approximately 30 feet below grade Groundwater flow direction was toward <br /> the northeast (north I I' east) at a gradient of 0 006 ft/ft <br /> 4 Elevated concentrations of PHCs were detected in the samples collected fn om tine three <br /> monitoring wells The highest concentiations of benzene (4500 micrograms per Mer, <br /> µg/l) and TPH-G (1100 µg/1) were detected in the sample from MW-1 Fuel oxygenate <br /> compounds were not detected in any of the groundwater samples <br /> 5 The PHC groundwater plume appears to be well-defined in all directions except to the <br /> northwest of monitoring wel I MW-1 <br /> 6 The distribution of PHC concentrations in groundwater, with the highest benzene <br /> concentrations at some distance from the former UST, suggest some other source for the <br /> benzene Additionally, the non-gasoline pattern of analytical chromatograms and <br /> associated atypical benzene to toluene, ethylbenzene and xylenes ratio suggests the <br /> contaminants in groundwater did not originate at the former gasoline UST <br /> KRAZAN & ASSOCIATES, INC <br /> Offices Serving the Western United States <br /> 3498081 ag2 <br />