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22 February 2000 <br /> AGE-NC Project No. 98-0481 <br /> Page 7 of 7 <br /> 5.4. 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 bentonite or cement-bentonite slurry from the total <br /> depth to approximately one foot below surface grade. The boring abandonment will be completed <br /> at surface grade with asphalt or concrete. <br /> Advanced GeoEnvi ron mental,Inc. <br />