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As reported in the January 29, 1991 report prepare for the south- adjoining adjoining properties, hydrocarbons in ground' water had not been delineated to the north, west or south (of the study)area). The ground water elevation data collected during the present investigation indicated !1II that ground water flow beneath the Property . as i n a north, northeast direction. It is noted that this ground water gradien!t is in the opposite k direction as the gradient observed at the south adjoining property, as E reported in the January 29, 1991 report. Possible explanations for the q i� gradient variation may include: seasonal gradient fluctuations (the south adjoining properties gradient calculation was based on data f collected during the dry season [July 19901; c�ompated to the present E I investigation with data collected in the wet season [March 19970; the f f l ground water gradient may have changed over time'!(between 1990 and 1997); or there may be a ground water mounding between the two sites, resulting in two opposite ground water gradients on each side of I ff � the mounding. II The ground water data collected during the present;'investigation suggest that a known source area (the south adjoining!. ro erties) are directly upgradient of the Property, and may be directly contributing to the ground water impact observed at the Property. Further, the greatest MTBE concentrations in ground water beneath the .Property were detected in the upgradient (nearest the southern adjoining properties) boring (SB-02), with a decreased MTBE concentration observed in the I downgradient boring (SB-03). Further, MTBE, a 'omponent in gasoline since 1979, is highly soluble in water and its very mobile in the ' subsurface. r I� 808-001.rpd04-29-971u/keydata/repom 26 �L