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1 <br /> for the stockpiled soil are attached in Appendix B. <br /> 5. 0 CONCLUSIONS & RECOMMENDATIONS <br /> Analytical results for the soil samples collected during this <br /> investigation indicate that the soil contamination associated with <br /> the former underground storage tank has not migrated laterally. <br /> Only two soil samples contained any detectable contamination (B7-10 <br /> and B9-10) . These samples were collected near the piping leading <br /> ' from the storage tanks to the pump islands. The minor <br /> concentrations of contaminants indicate that any piping leaks were <br /> limited in nature. <br /> ' Soil samples collected at the time of tank removal indicate that <br /> contamination could be present beneath the floor of the tank pit. <br /> The tank pit is currently 15 feet in depth. Some debris from the <br /> 1 tank removal (asphalt and concrete) is currently on the floor of <br /> the excavation. This debris should be removed from the excavation <br /> before any soil samples are collected or the excavation is <br /> ' backfilled. <br /> To remove soil contamination and debris from the floor of the <br /> M excavation and to collect soil samples, GeoAudit recommends that <br /> the floor of the tank pit be excavated to a depth of 20 feet <br /> (approximately 5 feet below current depth) . The excavated soil <br /> should be screened using field methods and soil samples collected <br /> ' when no indication of hydrocarbon contamination is present. we <br /> estimate removing a maximum of 500 cubic yards of contaminated <br /> soil. However, if soil contamination extends to depths greater than <br /> ' 25 feet, alternate methods of remediation will have to be <br /> implemented. <br /> ' GeoAudit also recommends that the soil currently stockpiled on-site <br /> be used as backfill for the excavation after any remaining <br /> contaminated soil has been removed from the excavation. <br /> ' 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care <br /> and skill ordinarily exercised by environmental consultants <br /> practicing in this or similar localities. The findings were mainly <br /> based on analytical results provided by an independent laboratory. <br /> No other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report. <br /> 1 <br /> 4 <br />