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' 11 September 2002 <br /> AGE-NC Project No 96-0249 <br /> IPage 5 of 6 <br />' plume However, the area of greatest dissolved petroleum hydrocarbon-impact was <br /> encountered in the samples from wells MW-3 and MW-6 (Figure 4) Lower petroleum <br /> hydrocarbon concentrations were detected from intermediate well MW-1 which may indicate <br />' a separate 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-2, MW-4, MW-6 and Flag City Chevron wells MW-7 suggest the possibility of two <br /> separate dissolved MTBE-plumes (Figure 5) <br /> • The distribution of TPH-d concentrations detected in Three B's Truck Plaza wells MW-1, <br />' MW-2, MW-3, MW-6 suggest the possibility of at least two separate dissolved TPH-d <br /> plumes (Figure 6) <br />' • Laboratory results of grab water samples collected from DWA indicate that there is currently <br /> no petroleum-impact to the Three B's Truck Plaza domestic drinking water well (Table 4), <br /> however, a down-hole video probe of DW-1 in November 2001 showed that the well casing <br /> from DW-1 extends from surface grade to 83 feet bsg and is open bore-hole from 83 to 98 <br /> feet bsg Based on grab water samples collected at the site during the cone penetrometer <br /> testing (CPT) site investigation in November 2001 (Cone Penetrometer Testing Site <br />' Investigation-Fourth Quarter 2001,dated 15 March 2002),substantial petroleum-impacted <br /> ground water was detected between 20 and 110 feet bsg <br /> 5 0. RECOMMENDATIONS <br /> Based upon data collected during June 2002, 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 September 2002 <br />' 2 Continued coordination of quarterly ground water monitoring events with Flag City Chevron <br /> A Work Plan Addendum was approved by the SJCEHD on 02 August 2002, the scope of work <br />' included installation of six multi-I evelground water monitoring wells Upon approval by the <br /> SJCEHD and pre-approval by the UST Cleanup Fund, AGE will schedule field work with the <br /> SJCEHD <br /> Advanced GeoEnvironmental,Inc <br />