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r29 March 2001 <br /> • AGE-NC Project No 97-0249 <br />' Page 5 of 6 <br />' plume The area of greatest dissolved petroleum hydrocarbon-impact was observed in the <br /> area near MW-3 (Figure 4) <br /> • Elevated concentrations of dissolved petroleum hydrocarbons were detected in the samples <br />' collected from well MW-6,the TPH-g isoconcentration contour map(Figure 4) may indicate <br /> a second plume of dissolved petroleum hydrocarbons in the area of MW-6 <br />' • Laboratory results of the grab water sample collected from DW-1 indicate that there is no <br /> MTBE-impact to the Three B's Truck Plaza domestic drinking water well at this time, <br /> however, MTBE has consistently been detected in the Rocky's Restaurant dnnking water <br />' well since February 1999 (Table 4) <br />' 5.0. RECOMMENDATIONS <br />' Based upon data collected dunng March 2001, AGE recommends <br /> 1 Continued quarterly ground water monitoring at wells MW-1 through MW-6, the next <br /> quarterly ground water monitoring event is tentatively scheduled for June 2001 <br /> 2 Continued coordination of quarterly ground water sampling events with Flag City Chevron <br />' 3 Additional ground water investigation is warranted to assess the vertical and horizontal <br /> extent of petroleum hydrocarbon-impacted ground water at the site AGE recommends at <br /> least five additional CPT soil borings to assess the vertical and horizontal extent of <br /> hydrocarbon-impacted ground water at the site <br /> 4 Installation of additional shallow- and deep-screened ground water monitoring wells based <br />' on the findings of the existing shallow ground water monitoring wells and CPT soil borings, <br /> the screen intervals for the deep-screened monitoring wells will be placed to define and <br /> monitor the horizontal extent of the ground water plume in each informal hydrologic unit <br />' 5 Conduct a ground water pump test to obtain general aquifer characteristics such as hydraulic <br /> conductivity, transmissivity, storativity and drawdown at various pumping rates Results of <br /> the pump test would be utilized to estimate a radius of influence for the zone of capture of <br /> dissolved petroleum hydrocarbons <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 /> Advanced GeoEnvzronmental,Inc <br />