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12 February 2001 <br /> AGE-NC Project No. 00-0806% _ <br /> Page 5 of 5 <br /> 4.5. BORING ABANDONMENT . <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings shall be abandoned by backfilling with portland cement from the total depth to surface grade. <br /> Advanced GeoEnvironmental,Inc. <br />