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23 October 2000 <br /> AGE-NC Protect No 98-0448 <br />' Page 4 of 5 <br /> ' • Due to abnormally high laboratory reporting limits for samples collected from wells MW-2, <br />' MW-4A and MW-4B, TBA may also be present at the site at concentrations below the <br /> laboratory determined detection limits <br />' • Previous laboratory results of ground water samples collected from wells MW-1, MW-4B, <br /> MW-6 and MW-8 suggest that there is a minor dissolved D1PE impact <br /> • The elevated petroleum hydrocarbon concentrations detected In water samples collected from <br />' wells MW-1 and MW-2 (screened between 20 and 40 feet bsg), MW-4A (screened between <br /> 8 and 33 feet bsg) feet and MW-4B (screened between 45 and 50 feet bsg) suggest that these <br />' wells may be screened within or near the dissolved petroleum hydrocarbon"core area"of the <br /> plume <br /> I • The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br /> current array of ground water monitoring wells <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends <br /> I • Continued quarterly ground water monitoring The next quarterly monitoring and sampling <br /> event is tentatively scheduled for November 2000 <br /> • A Remedial Action Work Plan (RAP),dated 07 July 2000, was approved by the PHS-EHD <br />' by letter dated 14 July 2000 Upon UST Cleanup preapproval,the scope of work outlined In <br /> the RAP should be implemented <br /> I • Preparation of work plan to abandon ground water extraction well EW-1, AGE suspects that <br /> EW-1 is a vertical conduit to deeper depth ground water and there are no future plans to <br /> utilize EW-1 for site characterization or site remediation <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> I environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory and a well casing elevation survey <br /> performed by an independent sub contractor Evaluations of the geologic/hydrogeologlc conditions <br />' at the site for the purpose of this investigation were made from a limited number of available data <br /> points (i a monitoring well ground water samples), and subsurface conditions may vary away from <br /> Advanced GeoEnvironmental,Inc <br />