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December 2012 I . 1 r� '�' 12'0 AGE-NC Project No. 01-0887 Ure Page 4 of 5 _ f r� ' `t .r canister will be attached to the end of the sampling manifold while the sample canisters will " y P 9 be attached to the tee-fitting between the PRT and purge container. Teflon® tape will be placed on the threads of each open fitting of the manifold assembly prior to attaching the PRT and sampling and purge canisters. Leak tests will be performed on each assembly by attaching and securing the sample and purge canisters to the manifold and opening the valves on the purge canister and the / manifold. The leak test will be performed for approximately 10 minutes on each assembly. Each soil-vapor boring location will be isolated from ambient air by enclosing the borehole, tubing and manifold/canister assembly in plastic shroud, which will be weighted at the surface. Isopropyl alcohol (IPA)as a liquid will be placed in a stainless steel bowl within the plastic structure and allowed to volatilize into the air enclosed within the plastic structure surrounding the borehole, tubing and manifold/canister assembly. The purge volume will be determined by calculating the internal volume of the tubing,vapor point holder and PRT adapter and the volume of sampling void (created by retracting the boring rod). Upon achieving a successful leak test and allowing for 120 minutes of equilibration time, the purge canister valve will be opened for a calculated period of time to allow the three calculated volumes of air to be purged. The purge vacuum gauge will be monitored to ensure a proper decrease of vacuum purged, Upon achieving the targeted purge volume, the purge canister valve will be closed and the sample canister valve will be opened. The initial pressure and time will be recorded. Upon reaching at least -5 in Hg or less, the sample canister valve will be closed and final pressure and time recorded. The sampling port on the sampling canister will be capped with a brass end-cap. The samples will be transmitted to a CDPH-certified laboratory under chain-of-custody by courier. EQUIPMENT DECONTAMINATION Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox. All probing rods will be cleaned prior to advancement at each probe boring location. Advanced CeoEnvironmental,Inc.