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' 15 November 2004 <br /> • AGE-NC Project No 96-0229 <br />' Page 6 of 6 <br />' • The highest concentrations of dissolved MTBE were detected off-site from First Water Zone <br /> wells MW-6(screened 25-45 feet)and MW-9(screened 20-40 ft), and from First Confining <br /> Unit well MW-i OB(screened 50-55 feet) Lesser MTBE concentrations were detected onsite <br /> from First Water Zone wells MW-1,MW-2,MW-4 and off-site from wells MW-7,MW-11, <br /> MW-12, MW-16 (A and B) and MW-18B The vertical extent of MTBE appears to be <br /> approximately between 45 feet (MW-6) and 62 feet (MW-13A/MW-14A) <br />' • TPH-g, BTEX, and MTBE were reported for the eleventh consecutive quarter in water <br /> samples collected from MW-9, a significant decrease in TPH-g, BTEX, and MTBE <br /> I concentrations was evident between the November 2003 and the June 2004 monitoring <br /> events, suggesting that the plume of petroleum-impacted ground water may have shifted <br /> more eastward (Table 3) <br /> L • Significant concentrations of 1,2-DCA were detected in the samples collected from wells <br /> MW-1, MW-9, MW-10B, MW-16C, MW-17A, MW-18C, and MW-19-A <br /> 5.0. RECOMMENDATIONS <br />' • Based upon data collected during June 2004, AGE recommends <br /> • Continued utilization of wells MW-1 through MW-19 for quarterly groundwater monitoring <br /> and sampling <br /> • Ground water monitoring of the subject site concurrently with Pacific Mini Mart (4511 <br /> Pacific Avenue) <br /> Based on the data collected during the second quarter 2004, additional ground water monitoring <br /> wells are not warranted at this time and the existing monitoring well network may be sufficient to <br /> complete a site Problem Assessment Report (PAR) <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> en-vironinental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a <br /> limited number of available data points(e g ground water samples),and subsurface conditions may <br /> vary away from these data points No other warranty, expressed or implied, is made as to the <br /> professional interpretations, opinions, and recommendations contained in this report <br /> IAdvanced GeoEnviron mental,Inc <br /> I <br />