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Mr.Russell Chapin <br /> October 9, 1992 <br /> Page 2 <br /> These substances were detected in the soil samples at low to moderate <br /> concentrations and in the groundwater at high concentrations (200 ppm TPHg, 31 <br /> ppm benzene, 11 ppm toluene, 1.9 ppm ethylbenzene, and 5.2 ppm total xylene <br /> isomers). <br /> Based on the results of laboratory analyses of the samples that we collected, <br /> the soil and groundwater at the site appears to have been contaminated to a <br /> significant degree. Additional work will be required to evaluate the degree of <br /> contamination and to define the vertical and lateral extent of contaminant migration. <br /> PROPOSED WORK <br /> As an initial phase in operations to mitigate contamination at the site, Chapin <br /> Brothers have decided to remove all underground tanks from the site. The purpose <br /> of this work pian is to delineate a series of steps which will be undertaken to facilitate <br /> tank removal and future required environmental investigation and contamination <br /> mitigation options. <br /> Limiting factors in site operations include limited space onsite, the proximity <br /> of the western tanks to the sidewalk and adjoining street, safety concerns associated <br /> with the proximity of the site to an elementary school, and a desire to avoid <br /> interrupting site businesses as much as possible. Based on the information collected <br /> to date, it is clear that contamination will be found beneath at least one of the tanks. <br /> Typically, soil samples would be collected from the base of the tank excavation to <br /> evaluate contaminant concentrations and the excavation would be left open until <br /> appropriate remedial action plans could be designed and laboratory analyses could <br /> be completed. <br /> It is our opinion that the contamination which is expected to be found would <br /> be best addressed by the future installation of a soil vapor venting system in concert <br /> with groundwater extraction. The sandy nature of the soil encountered in the soil <br /> boring strongly implies that soil vapor extraction would be effective in lowering <br /> gasoline concentrations in the site soil. Further work will be required to define the <br /> extent of contamination and prior to initiation of contamination mitigation <br /> operations, <br /> FQDTT <br /> r��urr�rr� <br />