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25 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 12 of 12 <br /> lateral extent of TPH and BTEX has not been defined by sample collected in the former UST <br /> area, yet low concentration of TPH and BTEX are present south of the former UST area at <br /> well MW-6 <br /> • The dissolved MTBE has migrated west of the former UST area in the shallow water table <br /> and migrated northwest under Waterloo Road The vertical migration of dissolved MTBE <br /> has been reduced by the advective forces of significant ground water hydro stratzgraphic <br /> flow units,particularly at a depth of 100 feet bsg,yet the dissolved plume of MTBE extends <br /> well beyond the site and nearly one-half of a mile west of the site <br /> • The general combination of free phase petroleum product and a long duration of <br /> contamination in the environment likely has generated a vertical diffusion, which likely <br /> equal or exceeds the lateral migration distance of the dissolved MTBE west of the site <br /> Therefore additional deep ground water extraction from the three main deeper ground water <br /> hydrostratigraphic units is justified <br /> Advanced GeoBnvironmenlal,Inc <br />