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When ready to sample: <br /> 4. Remove brass cap. <br /> 5. Attach particulate filter to canister. <br /> 6. Open valve 1/2 turn (6 L canister normally takes about 16 sec to fill). <br /> 7. Close valve by hand tightening knob clockwise. <br /> S. Verify and record final vacuum of canister (repeat steps used to verify initial vacuum). <br /> 9. Replace brass cap. <br /> 10. Fill out canister sample tag. <br /> 11. Return canister in box provided <br /> - Unreturned canister charge of$450 each <br /> 12. Return sample media in packaging provided. Unreturned equipment charges: <br /> - $45 per particulate filter <br /> - $45 per gauge <br /> 13. Fill out chain-of-custody and relinquish samples properly. <br /> 14. Place chain-of-custody in box and retain pink copy. <br /> 1 <br /> Flow controller by <br /> Entech <br /> ro <br /> zs. <br /> .... <br /> Yw <br /> d . �.. Flowcontroller <br /> by Veriflo <br /> 15. Tape box shut and affix custody seal (if applicable) across flap. <br /> 16. Ship accordingly to meet method holding times. <br /> 3.2 Integrated Sampli iCanisters and Flow Controllers <br /> An air sample collected over more than.a few minutes is referred to as an integrated sample and can <br /> provide information on compound concentrations in air averaged or composited over time. An 8- or <br /> 10-hour integrated sample can be used to determine indoor air quality in the workplace. Similarly, a <br /> ( AIR TOXICS LTD. <br /> 10 <br />