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31 January 2000 <br /> AGE-NC Project No. 99-0653 <br /> Page 6 of 6 <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <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 cement from the total depth to surface grade. <br /> Advanced GetiEnNirUNnental,[tic. <br />