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------------------------------------------------------------------------------------------------------ 01/02/1300 09: 45 FROM 70 12094656831 F. 02 Mr. Russell Chapin y October 1G, 19'92 Page 2 groundwater sample were tested for total Petroleum hydrocarbons as gasoline (` PH9), and for benzene, toluene,ethylbenzene, and total xylene isomers(BTEK). These substances were detected in the soil samples at low to moderate concentrations and in the groundwater at high concentrations(200 ppm TPlig, 31 ppm benzene, 11 ppm toluene, 1.9 ppm ethylbenzene,and 5.2 ppm total XyIene isomers). Based on the results of laboratory`analyses of the samples that we collected, the soil and groundwater at the site appears to have been contaminated to a significant degree. Additional work will be'required to evaluate the degree of contamination and to define the vertical and lateral extent of contaminant migration. PROPOSED WORK As an initial step in operations to mitigate contamination at the site,Chapin Brothers have decided to remove all underground tanks from the site. Uniting factors in site operations include limited space onsite,the proximity of the western tanks to the sidewalk and adjoining street, safety concerns associated with the proximity of the site to an elementary school, and a desire to-avoid interrupting site businesses as much as possible. Based on the information collected to date, contamination is expected to be found beneath at least one of the tanks. Typically, soil samples would be collected from the base of the tank excavation to evaluate contaminant concentrations and the excavation would be left open until appropriate remedial action pians could be designed and laboratory analyses could be completed. We believe that the contamination expected to be found would be effectively mitigated by the future installation of soil vapor venting and groundwater extraction systems. The sandy nature of the soil encountered in the soil boring strongly implies that soil vapor extraction would be effective in lowering gasoline concentrations in soil. Further work will be required to define the extent of contamination and prior to initiation of contamination mitigation operations. Chapin Brothers requests that they be permitted to backfill the tank �- excavations as soon as possible after tank removal and oollection of the required samples below the tanks. This would minimize site disturbance and would mitigate potential safety hazards posed by the proximity of the excavations to streets and -- sidewalks. Once tank removal and backfilling is complete,Chapin Brothers will aorto