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Mr. Russell F. Chapin, Sr. <br /> November 15, 1995 <br /> Page 2 <br /> • Soil samples taken during tank removal indicated that significant contamination was <br /> present below the tanks. <br /> • Four soil borings were drilled onsite and offsite to the north and west and converted into <br /> one 4-in vapor extraction well and three 2-in groundwater monitoring wells by SEACOR; <br /> this was followed by drilling 8 soil borings, 7 of which were located offsite to the west <br /> and west-southwest. Contamination was found to extend offsite to the west-southwest up <br /> to 200 ft, although most offsite contamination was at very low levels. <br /> • An aquifer test and a vapor extraction test were performed by SEACOR; while the data <br /> were of poor quality, it was judged that groundwater extraction was not feasible and that <br /> soil vapor extraction was likely to be feasible. However, it should be noted that the test <br /> was of short duration and was not performed on multiple wells. <br /> • Geological Audit Services drilled five soil borings and constructed one dually completed <br /> 4-in vapor extraction well/2-in air sparging observation well, one 2-in air sparging <br /> observation well, one dually completed 2-in vapor extraction well /2-in air sparging well, <br /> one 4-in vapor extraction well, and one air sparging well, and performed an air <br /> sparging/vapor extraction feasibility test. During the test, vacuums of 22 to 40 ins H2O <br /> resulted in observed vacuums up to 90 ft away from the extraction well; an estimated <br /> radius of influence of 37 ft was presented. <br /> SCOPE OF WORK <br /> The Scope of Work includes the following tasks delineated in the Final Remedial Plan for <br /> the site: <br /> • Construction of one additional groundwater monitoring well. <br /> • Installing trenching to install piping , installing a Vapor Extraction/In Situ Air Sparging <br /> System. <br /> • Procuring an internal combustion engine/blower for the remediation system. <br /> • Monitoring the system daily for the first two weeks, weekly for one year, and monthly <br /> collection and analysis of air samples. <br /> • Progress soil sampling at 6-month intervals. <br /> 4058-P3 <br /> LUSH GEOSCIENCES <br />