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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 /> 3. Equipment and Supplies <br /> 3.1 All the necessary devices needed for a complete soil gas sampling process with Helium as leak check <br /> compound are provided by MAI. Complete basic kit includes: Helium tank, Helium meter, small pump, <br /> purge can with Rota meter attached,cork borehole barriers, sample cans and manifolds. (See figure 1.) <br /> 3.2 The following equipment listed below is provided by MAI. <br /> 3.2.1 Six-liter plastic shroud box with lid of plastic sheeting.There are five connection ports located on the <br /> sidewalls of the shroud. They are labeled respectively as Port#1,Port#2,Port#3,Port#4 and Port#5 <br /> (See figure 1). <br /> 3.2.1.1 Port#1 is for attaching the Purge can/a vacuum pump to the sample train. <br /> 3.2.1.2 Port #2 is the connection of the air pump to the shroud. The air pump facilitates the <br /> stabilization of the Helium concentration at 20%. <br /> 3.2.1.3 Port#3 connects the Helium meter to the shroud for monitoring Helium content in the shroud. <br /> 3.2.1.4 Port#4 allows a reading of Helium in the borehole,when borehole integrity test is needed, as <br /> well as a purged volume determination with a syringe <br /> 3.2.1.5 Port#5 connects the Helium shroud to the Helium supply tank. <br /> 3.2.1.6 Two inch diameter opening for borehole access. <br /> Port 2 Gauge 1 Gauge 2 <br /> T Valve I <br /> Port 3 Valve L <br /> e Meter,F Valve IV Port 1AL <br /> y �' <br /> ,Port 5 <br /> Air Pu `�. •I' <br /> P 1- <br /> ,� Port 4 "T <br /> aloe III He Supply <br /> Borehole Barriers <br /> Figure 1.MAI designed Helium Shroud <br /> Page 3 of 9 <br />