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18 June 2001 <br /> AGE-NC Project No, 98-0452 <br /> Page 4 of 4 <br /> 4.4. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants. Sol] <br /> borings shall be abandoned by backfilling with portland cement from the total depth to surface grade <br /> .Advanced Geo F,nvironntental,Inc. <br />