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06 June 2000 <br /> AGE-NC Project No. 95-0197 <br /> Page 7 of 7 <br /> 4.1-4. 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 portland from the total depth to surface grade. <br /> Advanced GeoEnviron mental,Inc. <br />