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06 March 2002 <br /> AGE-NC Project No 01-0865 <br /> Page 9 of 9 <br /> at depths between 44 feet and 50 feet bsg, were impacted by TPH-g in borings B 1, B3, B4, <br /> B6, B7, B8,B9 and B 10 With the exception of the sample collected from first encountered <br /> ground water in boring B9, the concentrations of TPH-g detected are low Geologic <br /> cross-sections illustrating the vertical distribution of petroleum hydrocarbons are presented <br /> in Figures 3 and 4 <br /> • Ground water samples collected from first encountered ground water were impacted by <br /> MTBE in borings B1, B4, B7 and B9 Samples collected from deep ground water at depths <br /> between 44 feet and 50 feet bsg, were impacted by MTBE in borings B1, B6, B8 and B9 <br /> Geologic cross-sections illustrating the vertical distribution of dissolved MTBE are presented <br /> in Figures 3 and 4 Isocontour maps illustrating the approximate areal distribution of <br /> dissolved MTBE are presented in Figures 5 and 6 <br /> • The western,eastern and southern margins of the MTBE-impacted first encountered ground <br /> water has been defined The lateral extent has not been defined to the east, north or <br /> northwest The The southeastern and southern margins of MTBE-impacted deep ground <br /> water has been defined The vertical extent of MTBE-impacted ground water has not been <br /> defined <br /> • Taken as a whole, the available data suggests to AGE that the dissolved contaminant <br /> distribution encountered at the Herman & Helen's Marina site can be very reasonably <br /> interpreted to represent a partitioned plume originating from the former UST area and that <br /> the current AST system may not have contributed significantly to the plume <br /> 7.0. RECOMMENDATIONS <br /> Based upon data collected from the site,AGE recommends additional assessment of the lateral and <br /> vertical extent of impacted ground water on the site <br /> 8.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the geologic/ <br /> hydrogeologic conditions at the site for the purpose of this investigation are made from a limited <br /> number of available data points (i e grab ground water samples and soil samples) and subsurface <br /> conditions may vary away from these data points No other warranty, expressed or implied, is made <br /> as to the professional interpretations, opinions or recommendations contained in this report <br />