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5.2 Hydrocarbon Impacted Groundwater <br />' Groundwater gradient calculations indicate that MW-3 is the downgradient well The highest <br /> concentrations of petroleum hydrocarbons were detected in MW-3 However, TPH as <br /> gasoline and BTE&X were also detected in the sample from MW-1, up-gradient of the <br />' former UST excavation. The high concentration of petroleum hydrocarbons in MW-3 may <br /> be due to impacted groundwater detected on the property immediately east of the site <br />' Impacted groundwater has been detected on the property immediately east of the site, <br /> across Wilson Way Based on our experience, groundwater flow direction has historically <br /> shifted in various directions impacted groundwater from the Top Filling site and the Roek <br />' site may share an impacted groundwater plume Historical research concerning petroleum <br /> products used at this property and the subject property should be conducted GeoAudit <br /> recommends"fuel fingerprinting"of the groundwater samples collected in the second quarter <br />' to identify specific petroleum products <br /> To assess impacted groundwater in the western direction, GeoAudit recommends the <br />' installation of two additional groundwater monitoring wells at the site The wells should be <br /> located northwest of MW-1 and in the southwest portion of the property <br />' 5.3 Removal of Remaining Underground Storage Tanks <br /> GeoAudit recommends removal of the remaining USTs located on the north side of the gas <br /> station office <br /> 1 <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 laboiatory 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 /> I 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 /> f <br /> U.-1681 AW11&moa,Inc <br /> Top RU-g F11FRAaWJ.a 1WJ <br /> I <br />