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21 December 1998 <br /> AGE-NC Project No. 98-0533 <br /> Page 5 of 5 <br /> 4.4. 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 cement slurry from the total depth to surface grade. <br /> Advanced GeoEnvironmental,Ina <br />