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26 April2003 <br /> `: AGE-NC Project No. 960254 <br /> Page 4 of 4 I <br /> MTBE was detected in the ground water samples collected from MW=1B, MW-2B and <br /> MW-4. MTBE c ' <br /> oncentratlons m sample MW-1B exceeded the State'of Caiifornia MCL of <br /> 1.3. ggll in drinking water. <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends continued quarterly ground water <br /> monitoring at the site with the next monitoring event in June 2003.Additionally,AGE recommends <br /> completion of the scope of work proposed in the EHD-approved, AGE-prepared Remedial Action <br /> Plan (RAP) dated 31 October.2002. Work to be completed includes abandoning monitoring wells <br /> -MW-1,MW-4 and MW-7 for excavation of petroleum hydrocarbon-impacted soil from the former. <br /> UST,area: <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•orsunxlar localities. The findings were based mainly <br /> upon analytical results provided by an independent laboratory. Evaluation of the hydrogeologic <br /> conditions at the site for the purpose of this investigation are made-from a Limited number of <br /> available data points (i.e. monitoring well'ground water samples), and subsurface conditions may.' <br /> ,vary away from these data points..No other warranty, expressed or implied, is blade as to the <br /> professional interpretations, opinions and recommendations contained in this report. <br /> Advanced GeoEnvironinental Inc. <br />