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I15 January 2002 AGE-NC Project No 96-0232 ' Page 16 of 16 I Flag City Chevron plume appears to extend approximately 25 feet toward the north and approximately 30 feet bsg (Figure 7), to the west the plume appears to extend approximately 200 laterally and to depths as great as 75 feet bsg (Figures 7 and 8), to the south the plume appears to ' extend approximately 30 feet and to depths as great as 30 feet bsg (Figure 8), and to the east the plume appears to extend approximately 100 feet laterally and to depths as great as 30 feet bsg (Figures 7 and 9) 7.0 RECOMMENDATIONS ' Based upon data collected from the site, AGE recommends ' • Continued quarterly ground water monitoring and sampling of monitoring wells MW-1 through MW-13, municipal water wells CSA-1 and CSA-2 and domestic water wells DW-1 and RDW-1 ' • Continued coordinated quarterly ground water monitoring and sampling events with Three B's Truck Plaza �. e Continued selective ground water extraction in alternating weekly shifts from extraction wells located in the south trench-line (EW-2, EW--4, EW-6 and EW-9) and wells located in ' the north trench-line(EW-5, EW-7, EW-8 and EW-10) A heavier emphasis should be given to ground water extraction from EW-4 and EW-5 due to the higher MTBE concentrations reported at these wells 8.0. LIMITATIONS ' Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based mainly ' upon analytical results provided by an independent laboratory Evaluations of the geologic/hydro- geologic conditions at the site for the purpose of this investigation are made from a limited number ' of available data points (ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report 1 ' Advanced GeoEnvironmental,Inc