After the sampling period is ended, if using the 3500/3510:
a) Remove the plastic ring and white film from the monitor.
b) Immediately snap the elution cap (with plugs) onto the main monitor body.
Be sure the two port plugs are secured.
c) Record the final sampling time on the back of the monitor.
d) Return the monitor and the short plastic straw to the can.
e) Close the can with the plastic lid provided.
f) Record sampling information on the 3510 analysis form, ensure the form is
filled out completely, including the chain of custody section.