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� AMBRIA <br /> • Methyl tertiary butyl ether (MTBE) has not been detected in soil and groundwater at <br /> the site and does not appear to be a COC Tertiary butyl alcohol (TBA) has been <br /> detected in groundwater samples from site monitoring wells, but it is likely from an <br /> offsite source The former Shell service station ceased operations prior to the f <br /> introduction of fuel oxygenates into gasoline <br /> • The vertical and lateral extent of the COC in soil has been defined to the extent <br /> possible based on current site feature and access constraints <br /> • The lateral extent of the COC in groundwater has also been defined to the extent <br /> feasible <br /> • Soils beneath the site are primarily coarse grained with lesser amounts of fine grained <br /> soil The cross section included with this document indicates that there are no laterally <br /> continuous fine grained layers beneath the site <br /> • A sensitive receptor survey performed for the site did not identify any water supply <br /> wells or surface water bodies that are likely to be impacted by the site conditions <br /> RECOMMENDATIONS <br /> Cambria recommends preparation of a closure request for this site The COC are adequately <br /> defined,except where investigation is not possible,and no receptors are threatened by the COC <br /> 1660 2 <br />