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At end of sampling interval: <br /> 7. Verify and record final vacuum of canister (for 24-hr flow controller repeat steps used to verify <br /> initial vacuum and for critical orifice device simply read built-in gauge). <br /> 8. Close valve by hand tightening knob clockwise. <br /> 9. Replace brass cap. <br /> 10. Fill out canister sample tag. <br /> 11. Return canisters in boxes provided. <br /> - Unretumed canister charge of$450 each <br /> 12. Return sample media in packaging provided. Unretumed equipment charges: <br /> - $45 per particulate filter <br /> - $50-500 per flow controller <br /> 13. Fill out chain-of-custody and relinquish samples properly. <br /> 14. Place chain-of-custody in box and retain pink copy. <br /> 15. Tape box shut and affix custody seal (if applicable) across flap. <br /> 16. Ship accordingly to meet method holding times. <br /> Important information for Canister Sampling <br /> @ DO NOT use canister to collect explosive substances, radiological or biological agents, corrosives, <br /> extremely toxic substances, or other hazardous materials. It is illegal to ship such substances and <br /> you will be liable for damages. <br /> @ ALWAYS use a filter when sampling. NEVER allow liquids (including water) or corrosive vapors <br /> to enter canister. <br /> @ DO NOT attach labels to the surface of the canister. <br /> @ DO NOT over tighten the valve and remember to replace the brass cap. <br /> @ IF the canister is returned in unsatisfactory condition, you will be liable for damages. <br /> For help call Client Services at 800-985-5955 <br /> AIR TOXICS LTD. <br /> 15 <br />