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04 March 2005 <br /> AGE-NC Project No 01-0877 <br />' Page 4 of 4 <br /> 5.0. RECOMMENDATIONS <br /> Based n he findings of this investigation, AGE recommends <br /> o t g g , <br /> • Continued quarterly ground water monitoring at the site The first quarter monitoring event <br /> was performed in January 2005 <br /> • The vertical extent of ground water and saturated soil contamination should be fully defined <br /> with a multilevel monitoring well network at the former UST area prior to any additional <br /> shallow, lateral assessment off the site Based on the age of the UST release(s),the type of <br /> chlorinated contamination detected at the site, and the overall high concentrations of <br /> contaminants in ground water remaining at the site, it is likely that the R M B releases have <br /> migrated vertically to great depths near the release point <br /> • The increasing dissolved contaminate concentrations combined with the steadily decreasing <br /> ground water elevation has Indicated the occurrence of a significant mass of hydrocarbon is <br /> present in soil at the water table level This Impacted zone should be mitigated through soil <br /> vapor extraction to prevent additional hydrocarbon desorption into the mechanism of off-site <br /> Ile migration, a northeast flowing ground water table <br /> • The removal of TPH-mo analysis from the quarterly ground water monitoring schedule of <br /> analytes, as it has gone undetected for five consecutive monitoring events <br /> I <br /> I6.0. 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 upon <br /> analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions <br /> at the site for the purpose of this Investigation was made from a limited number of available data <br /> points(e g ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied,is made as to the professional Interpretations,opinions,and <br /> recommendations contained in this report <br /> 1 <br /> I <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />