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<br /> { P Section No 6
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<br /> '} Revision No 0
<br /> Date September 5, 1991
<br /> ? Page '11 of 55
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<br /> ■ Test the? canister, for maintained, evacuation After , 24 hours,
<br /> ..�.. ,4 L Ona ti0 ..��j..:a' ,411 �... -.-..a r..
<br /> traiL1.94Grj rYl L.Ll JVO GVa6.lif3 L.LVLL, LlallLLall1G V4 YYtil VG aV\..C1,l L.GIF LUL
<br /> sampling: r-,;�_�, , kir a__ ___--, - -,,. A_
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<br /> All sample containers" used for sample +collection and quality 'assurance
<br /> testing are conditional prior to use in the,fi.eld r
<br /> 6 3 3,2; --Conditioning--.,,Bag conditioning-is s described-as-follows
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<br /> ■ Bags are temporarily stored (24 to 48 hours) and ,transported to the
<br /> field partially'rfilled,,with' gas,
<br /> ■ Quality control analysis determines background concentrations of the
<br /> analytes of �intere'st,
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<br /> ■, The bag is 'filled with gas once more after conditioning,
<br /> ■ It i`s stored for 24 hours,,- then analyzed as {a normal 'sample
<br /> Conditioning "is -accepted if background concentrations do not
<br /> interfere, in attaining required detection limits'
<br /> oil
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<br /> ,Stainless steel_canisterTcOnditioning„i.s prescribed,fas follows
<br /> ■y; Careful selection_of custom-madee stainless steel hemispheres and use
<br /> �- of the highest' quality components, ,
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<br /> ■ "SUMMA” passivation of all sample contact surfaces,
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<br /> r, Argon shielded'; 100% penetration TIG ,welding on a custom-built
<br /> rotary fixture employing latest advances, in welding techniques and
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<br /> equipment,
<br /> ■ Helium, leak testing of all weldIs and fittings to 1 x 10-9 Std
<br /> cc/sec,
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<br /> r+, ■ High -temperature (!5400,F) bake-out and pump-down to 1 x 10 torr w/
<br /> liquid N2 trapped pumping system with "diffusion' pump and special
<br /> ionization/Pirani gauges,
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<br /> !° ■ Continuous Residual Gas Analyzer (RGA) data/sectralthroughout final
<br /> cleaning (bake 2 out/pump-out) of each Grab Sampler (TM) batch,
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<br /> ■ Background (pre-delivery) analysis/blanking of each Grab Sampler
<br /> (TM) batch (or optionally each Grab Sampler (TM) by ECD/FID Gas
<br /> Chromatography (CC) ) ,
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<br /> 6-11
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