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08 January 2001 <br /> AGE-NC Project No 97-0249 <br /> Page 5 of 5 <br /> • Ethanol was detected at well MW-5 AGE suspects that the ethanol previously detected in <br /> the DW-1 (May 2000) "grab"ground water sample and now in MW-5 was due to the coated <br /> bentonite pellets utilized during construction of Flag City Chevron wells MW-11 and <br /> MW-13 <br /> 50 RECOMMENDATIONS <br /> Based upon data collected during December 2000, AGE recommends <br /> Ii <br /> Additional vertical sot and ground water assessment is warranted at the site AGE has <br /> tentatively scheduled with the PHS-EHD to drill three cone penetrometer testing (CPT) soil <br /> borings in January 2001 to characterize the vertical extent of hydrocarbon-impacted ground <br /> water at the site Proposed CPT soil boring locations are depicted in Figure 2 <br /> • Installation of deep-screened ground water monitoring wells based on the findings of the <br /> proposed CPT soil borings, the screen intervals for the deep-screened monitoring wells will <br /> be placed to define and monitor the vertical and lateral extent of the ground water plume <br /> G Installation of additional shallow-screened ground water monitoring wells south, southwest, <br /> west, northwest, north and northeast of the current area bound by wells MW-1 through <br /> MW-6 to assess the lateral extent of the dissolved petroleum hydrocarbon plume <br /> O Continued quarterly ground water monitoring, the next quarterly ground water monitoring <br /> event is tentatively scheduled for March 2000 <br /> • Continued utilization of wells MW-1 through MW-6 for characterization of ground water <br /> conditions at the site <br /> • Continued coordination of quarterly ground water sampling events with Flag City Chevron <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 laboratory 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 (e g ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br />