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' 27 May 2004 <br /> AGE-NC Project No 96-0229 <br />' Page 6 of 7 <br /> (MW-13A/MW-14A),however all the screen intervals within well MW-13 are impacted by <br /> dissolved MTBE <br /> • The highest concentrations of off-site dissolved MTBE were detected in First Water Zone <br />' northeast of the site from well MW-6 and east of the site from well MW-9,additional off-site <br /> MTBE concentrations were observed at wells MW-7, MW-9, MW-10 (A-B), MW-15A, <br /> MW-16 (A-C), MW-17A, MW-18 (A-B) and MW-19A The vertical extent of off-site <br /> MTBE does not appear to extend much beyond 67 feet (MW-15A, MW-16C, MW-17A, <br /> MW-19A) <br /> • TPH-g,BTEX and MTBE were reported for the tenth consecutive quarter in water samples <br /> collected from MW-9, a significant increase in TPH-g, BTEX and MTBE concentrations <br /> was evident between the June 2003 and the November 2003 monitoring events suggesting <br /> that the plume of petroleum-impacted ground water may have shifted more eastward <br /> (Table 3) <br /> • Significant 1,2-DCA was detected in the samples collected from wells MW-1, MW-2, <br /> MW-10B, MW-13D, MW-15A, MW-16C, MW-17A and MW-18C <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during November 2003, AGE recommends <br />' Continued utilization of wells MW-1 through MW-19 for quarterly groundwater monitoring <br /> and sampling <br /> • <br /> Groundwater monitoring of the subject site concurrently with the Pacific Mini Mart (4511 <br />' Pacific Avenue) <br />' Based on the data collected during the fourth quarter 2003,additional groundwater monitoring wells <br /> are not warranted at this time and the existing monitoring well network may be sufficient to complete <br /> a site Problem Assessment Report (PAR) <br /> 1 T <br />' Advanced GeoEnvironmental,Inc <br />