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07 March 2002 <br /> AGE-NC Project No 99-0645 <br /> Page 9 of 9 <br />' • Petroleum hydrocarbons were detected in the soil sample analyzed from the boring advanced <br /> within the former UST excavation and advanced west of the former UST,under the building <br /> on the site The higher concentrations of TPH detected were limited to soil samples collected <br /> above 20 feet bsg <br /> • The highest concentrations of MTBE were detected with in a 45 foot thick interval,generally <br /> occurring between 15 feet and 60 feet The vertical extent of the MTBE-Impacted soil was <br />' limited to less than 70 feet bsg <br /> • MTBE was detected In one of the three water samples collected However,this concentration <br /> does not exceeds the State of California, Department of Health Services maximum <br /> contaminant level for MTBE In drinking water <br /> 6.0. RECOMMENDATION <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> Initiation of quarterly ground water monitoring program at the site, and <br /> • Preparation of a work plan for a vapor extraction feasibility study to remediate the vadose <br /> zone at the site <br /> 7.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing In this or similar localities The findings were based upon <br /> analytical results provided by an Independent laboratory Evaluation ofthe hydrogeologic conditions <br /> at the site for the purpose of this Investigation was made from a limited number of available data <br /> points (soil and ground water samples) and subsurface conditions may vary away from these data <br /> points No other warranty, expressed or Implied, is made as to the professional interpretations, <br />' opinions and recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />