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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 /> 4.3 An optional thermal desorption tube(sorbent tube)for TO-17(MAI routinely includes naphthalene in <br /> TO15). <br /> 4.4 An optional split sample manifold attachment <br /> 4.4.1 For simultaneous TO15 duplicate <br /> 4.4.2 For serial TO15 and TO17 sorbent tube <br /> 4.4.3 Optional second manifold for dual depth simultaneous sampling. <br /> 4.5 The soil gas manifold is leak checked in the lab prior to preparation for distribution. DO NOT <br /> DISASSEMBLE SOIL GAS MANIFOLD IN ANYWAY. Any damage to the equipment during sampling <br /> will incur repair fees. <br /> 5. Procedure <br /> 5.1 Assemble the shroud <br /> 5.1.1 Place cork shroud stabilizer over wellhead (various sizes provided for convenience and shroud <br /> stabilization) <br /> 5.1.2 Position shroud box so `borehole access' is over borehole/borehole barrier, ensure well sampling <br /> tube rises up through wellhead and gasket into helium shroud box. <br /> 5.1.3 Position sampling manifold and sample canister(s)in shroud and make necessary connections. <br /> Note: Optimally, to reduce contamination, cut surface section of well tubing before connecting to <br /> Valve I. <br /> 5.1.4 Connect the well tubing to 3-way valve I(the port that is perpendicular to the manifold) Tighten the <br /> nut over the tubing to make a good seal but do not over tighten as brass ferrules can easily shear <br /> Teflon tubing. <br /> 5.1.5 Connect the port 4 tubing to the remaining end of Valve I on the manifold. (the port in line with the <br /> manifold) <br /> 5.1.6 Connect Valve 11 to the tubing of portl <br /> 5.1.7 Connect purge can to Port#1 on the outside of the shroud box <br /> 5.1.8 Helium supply line is connected to Port#5. <br /> 5.1.9 Helium meter is initially connected to Port#3 for testing Helium concentration in the shroud.Prior to <br /> sampling,to conduct well integrity test for helium content,connect helium meter to Port 4. <br /> 5.1.10 Connect air pump to Port#2. <br /> 5.2 Charge the shroud with Helium <br /> 5.2.1 Initial Charge <br /> 5.2.1.1 Place plastic sheet loosely over box and secure with lid and lid clamps.Ensure a loose fit for <br /> valve manipulation. Ensure there are no gaps between the plastic sheet and lid. It is NOT <br /> necessary to adjust regulator pressure for helium supply bottle; it is preset at 10 Psi by MAI <br /> to sustain a constant 250mL/min helium flow to shroud and optimized for maintaining a 20% <br /> helium concentration. Turn 3-way valve III to `flood' position (tapered end of the valve <br /> Page 5 of 9 <br />