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The wells will be dnlled through the contaminated zone, or to a maximum depth of 50 feet <br /> (5 to 10 feet above groundwater) Figure 2 shows the well design The wells will be <br /> mamfolded to the existing remediation well (VW-1) to allow integration of the entire <br /> system In the future, it will be possible to drill wells to the northeast of the tank cavity and <br /> add them to the system, to enable remediation of the contaminated soil in the vicinity of <br /> boring B4 (Figure 1) Based on the results of the vapor extraction pilot test, the estimated <br /> radius of influence of vadose wells appears to be between 20 and 40 feet This estimate will <br /> be re-examined once a remediation system is in operation <br /> Drilling and sampling of the proposed vadose-zone wells will follow the protocol established <br /> in previous phases of this investigation These are enumerated in the Site Contamination <br /> Work Plan, dated August 10, 1991 A minimum of 5 soil samples will be analyzed from each <br /> boring, in accordance with FPA methods 8015m and 8020 for TPH-g, TPH-d, and BTE&X <br /> 3.0 DISCUSSION <br /> The proposed system of pipes and wells will offer flexibility in the choice of remediation <br /> technologies It is suitable for either in-situ vapor extraction or in-situ bioremediation, <br /> making it unnecessary to select a technology prior to installation Following installation and <br /> tank replacement, an interim soil remediation plan can be prepared, pnor to completion of <br /> the assessment of groundwater contamination <br />