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1534 Willow Pass Road,Pittsburg,CA 94565-1701 <br /> 0 MCCAM PBELL ANALYTICAL INC. Telephone:925-252-9262 Fax:925-252-9269 <br /> W "When Quality Counts" <br /> O www.mccampbell.com:main@mccampbell.com <br /> 5.9.3 An alternative TO-17 sampling technique, using the above set up but without the helium shroud & <br /> without the second pristine purge can, can be performed by using IPA wetted rags as the leak check <br /> and a vacuum pump or`used'purge can suction. IPA needs to be added to analytical the target list. <br /> 5.9.4 Duplicate TO15 sampling. Simultaneous duplicate sampling can be achieved by connecting an <br /> additional 1-liter canister to the manifold. The designated`split sample attachment'must be used. <br /> Note: When T017 ST sampling is needed, 2-way valve IV is in `off'position during the shut in test. <br /> The valve is only turned on for sampling T017 ST. On the contrary, 2-way valve IV is `on'for the <br /> shut in test during simultaneous TOI S sampling. <br /> 6.0 Disconnect and Move to the Next Site <br /> 6.1 After sample collection; close valve to sample canister, close valve on helium Supply, remove shroud lid, <br /> and detach borehole tubing from sample manifold. <br /> 6.2 Carefully label and remove sample manifold(s), canister(s) or sorbent tube(s) from shroud and ready the <br /> sampling apparatuses for shipment to McCampbell Analytical Inc. <br /> 6.3 Place the attached purge can, helium tank, 60 mL syringe, helium meter, air pump and tools into the <br /> shroud body, carefully remove the shroud and its contents from the borehole and collect the borehole <br /> seals/stabilizers and place them into the shroud box. <br /> 6.4 The shroud is now ready for transport to next borehole: the helium shroud, helium supply tank, helium <br /> meter, air pump, syringes and purge can are reusable. However, a clean certified manifold and sampling <br /> canister are needed for sampling the next well site. <br /> 6.5 When the sampling apparatuses are shipped to McCampbell Analytical Inc., TO-15 (or client specific <br /> target list) helium should be requested for analysis. Be sure to fill out Chain of Custody (COC) as <br /> completely as possible. All serial numbers of the equipment used for the sampling event need to be <br /> recorded on the COC. <br /> 7.0 References <br /> 7.1 Cal/EPA March 2010, Theo Johnson: Department of Toxic Substance Control,Advisory-Active Soil Gas <br /> Investigation DRAFT Advisory—Active Soil Gas Investigation CA EPA,March 2010 <br /> Page 9 of 9 <br />