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08 June 2010 <br /> AGE-NC Project No. 01-0839 <br /> Page 5 of 5 <br /> plastic structure surrounding the borehole, tubing and manifold/canister assembly. <br /> The purge volume will be determined by calculating the internal volume of the tubing,vapor point <br /> holder and PRT adapter and the volume of sampling void(created by retracting the boring rod). <br /> Upon achieving a successful leak test and allowing for 20 minutes for equilibrium to be achieved, <br /> the purge canister valve will be opened for a calculated period of time to allow the three calculated <br /> volumes of air to be purged.The purge vacuum gauge will be monitored to ensure a proper decrease <br /> of vacuum purged. <br /> Upon achieving the targeted purge volume, the purge canister valve will be closed and the sample <br /> canister valve will be opened.The initial pressure and time will be recorded.Upon reaching at least <br /> -5 in Hg or less,the sample canister valve will be closed and final pressure and time recorded. The <br /> sampling port on the sampling canister will be capped with a brass end-cap. <br /> The soil vapor samples will be analyzed for the constituents listed in Section 2.2. <br /> 3.3. 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 /> 3.4. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration ofpotential contaminants. <br /> Soil borings shall be abandoned by backfilling with portland cement from the total depth to surface <br /> grade. <br /> Advanced GeoEnvironmentsl,Inc. <br />