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r-L 1 I N C <br /> ' 4 Place a clean, one-liter Tedlar ba in the vacuum box Prior to placing in the <br /> . g p g <br /> ' vacuum box, label the bag with an appropriate sample identification Attach the <br /> valve on the Tedlar bag to the tubing connecting the vacuum box to the probe <br /> ' sample line Open the valve on the Tedlar bag and seal the vacuum box <br /> ' (Note If using the vacuum box and a Tedlar bag for purging, be sure to replace <br /> the bag with a clean, unused bag before collecting a vapor sample for laboratory <br /> ' analysis ) <br /> ' S Open the clamp on the silicone adapter tubing (on the probe sample line), <br /> engage the vacuum pump, and allow a vapor sample to be drawn Into the <br /> ' Tedlar bag Control the vacuum, and therefore the sample flow rate, using the <br /> small brass valve and the pressure gauge on the vacuum box Sample at a <br /> ' vacuum of less than 6 En-Hg and a flow rate of I to 2 liters per minute <br /> 6 When sufficient sample has been obtained, close the clamp an the probe line <br /> ' and turn off the vacuum pump Release the vacuum from the vacuum box and <br /> open the box Close the Tedlar bag valve and disconnect the tubing from the <br /> bag to the probe line valve <br /> i <br /> 7 Immediately place the pre-labeled, Tedlar bag in a non-chilled, light-tight, <br /> insulated cooler for transport to the laboratory <br /> (Note If holding times greater than 72 hours are required, Summa canisters <br /> ' should be used instead of Tedlar bags for sample collection Summa canisters are <br /> evacuated (that is, under vacuum) so a vacuum pump and box are not needed to <br /> ' collect a vapor sample ) <br /> APPENDIX III <br /> ' 12270020 025 9 <br />