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1 <br />' 26 May 2004 <br /> AGE-NC Project No 96-0229 <br />' Page 5 of 6 <br />' • The highest concentrations of off-site dissolved MTBE were detected northeast of the site <br /> from well MW-6(screened 25 to 45 feet bsg),additional off-site MTBE concentrations were <br /> observed at wells MW-7, MW-9, MW-10 (A and B) and MW-11 <br /> • Due to the significant MTBE concentrations detected near the UST tank pit area from well <br /> MW-1 and from down-gradient well MW-10B, the dissolved MTBE plume is vertically <br />' undelineated on-site and down-gradient from the site (Figure 5) <br /> • Since monitoring wells MW-1,MW-IOB,MW-13 (A-D)and MW-14(A-D)are `drowned', <br /> these wells should yield samples representative of deeper ground water conditions Deeper <br /> ground water in the area of MW-1 (48 to 53 feet bsg) is impacted by significant TPH-g, <br /> BTEX, 1,2-DCA and MTBE, ground water in the area of downgradient well MW-10B is <br /> impacted by MTBE, ground water in the area of MW-13 (A, B and D) and MW-14A <br /> detected low concentrations of TPH-g and BTEX <br /> • Significant 1,2-DCA was detected in the sample collected from well MW-I (screened 48 to <br /> 53 feet bsg), which implies that dissolved 1,2-DCA is vertically undelineated at the site <br />' • 5.0. RECOMMENDATIONS <br /> Based upon data collected during August 2003, AGE recommends <br /> • Continued utilization of wells MW-1 through MW-14 for quarterly groundwater monitoring <br /> Iand sampling <br /> Groundwater monitoring of the subject site concurrently with the Pacific Mini Mart(4511 <br /> Pacific Avenue) <br /> In October 2003, AGE Installed five additional off-site multi-level ground water monitoring wells <br /> I (MW-15 through MW-19) These wells will be incorporated in subsequent groundwater monitoring <br /> events <br /> Advanced GeoEnviron mental,Inc <br /> I <br />