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27 July 2005 <br /> •` AGE-NC Project No 01-0877 <br />' Page 4 of 4 <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of this Investigation, AGE recommends <br />' 0 Continued quarterly ground water monitoring at the site The next quarter monitoring event <br /> was performed in April 2005 <br />' 0 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 indicates the occurrence of a significant <br /> mass of hydrocarbon is present in soil at the water table level This Impacted zone should be <br />' immediately be mitigated through direct-combined soil vapor extraction and ground water <br /> extraction (high-vacuum extraction/treatment or dual-phase) to prevent additional <br />' hydrocarbon desorption into the mechanism of off-site migration with a northeast flowing <br /> ground water table <br /> • AGE is currently preparing work plans for interim remediation and further assessment at the <br />' site as requested by the EHD letter dated 02 May 2005 <br />' 6.0. 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 /> T <br /> I <br /> Advanced GeoEnvironmental,Inc <br />