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12 June 1996 <br /> AGE-NC Project No 95-0104 <br /> Page 5 of 5 <br /> of 200µg11 <br /> The ground water surface was approximately 16 feet above the top of screen intervals in wells MW-2 <br /> through MW-4 and was approximately 24 feet and 42 feet below the top of screen intervals in wells <br /> MW-I and VW-1, respectively Because the screened intervals in MW-2, MW-3, and MW-4 are <br /> beneath the surface of the ground water, samples collected in those wells may not be representative <br /> of actual aquifer conditions <br />' 5 2 RECOMMENDATIONS <br />' An additional ground water monitoring well should be considered for installation down-gradient of <br /> VW-I with an appropriate screened interval above surface ground water In addition, future quarterly <br /> monitoring events should incorporate VW-1 into the sampling program <br />' We recommend the next quarterly sampling be scheduled for July 1996 Samples collected should <br /> be analyzed for MTBE ,n addition to TPH-g, BTE&X and HVOCs If MTBE ,s not detected from <br /> ground water samples collected during the July 1996 monitoring event, then analysis for MTBE <br /> during future sampling events should not be necessary <br />' A Corrective Action Plan and addendum, recommending soil vapor extraction as the preferred <br /> remedial option for the site, was submitted to the PHS-EHD Upon approval of the CAP, a Work <br />' Plan for the installation of the remediation system should be prepared and installation procedures <br /> should proceed <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent Iaboratory Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points (1 a soil and/or ground water samples), and subsurface conditions may vary <br /> away from these data points No other warranty, expressed or implied, is made as to the professional <br />' recommendations contained in this report <br />