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1 04 March 2002 <br /> AGE-NC Project No 96-0249 <br /> Page 5 of 6 <br />' plume of dissolved petroleum hydrocarbons in the area of MW-6 <br /> • The distribution of MTBE concentrations detected in Three B's Truck Plaza wells MW-1, <br /> MW-4, MW-6 and Flag City Chevron wells MW-7 and MW-13A suggest the possibility of <br />' two separate dissolved MTBE-plumes (Figure 6) <br /> • The distribution of TPH-d concentrations detected in Three B's Truck Plaza wells MW-1, <br />' MW-2, MW-3, MW-6 and Flag City Chevron wells MW-12A and MW-13A suggest the <br /> possibility of two separate dissolved TPH-d-plumes (Figure 5) <br /> • Laboratory results of grab water samples collected from DW-1 indicate that there is no <br /> MTBE-impact to the Three B's Truck Plaza domestic drinking water well, however, low <br /> concentrations of MTBE were detected at the Rocky's Restaurant domestic drinking water <br /> wells in December 2001 and previously have been detected from February 1999 to March <br /> 2001 (Table 4) <br />' <br /> 5.0. RECOMMENDATIONS <br /> lie Based upon data collected during December 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 March 2002 <br /> 2 Continued coordination of quarterly ground water monitoring events with Flag City Chevron <br /> 3 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 impacted ground water plume in each informal <br /> hydrologic unit of inferred higher permeability <br /> 4 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 /> I the pump test would be utilized to evaluate the feasibility of ground water extraction for <br /> plume control and to remediate dissolved petroleum hydrocarbons and MTBE <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 /> IAdvanced GeoEnvironmental,Inc <br />