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02 August 2000 <br /> AGE-NC Project No. 00-0728 <br /> Page 6 of 6 <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water <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 /> 4.5. 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 GeoEnvironmental,Inc. <br />