Record time and date of evacuation. After 24 hours collect flasks in same order as evacuated. Attach hand pump to tygon tubing. Release binder clip and record vacuum remaining in flask. Remove stopper and place parafilm over flask opening.
Place flasks in boxes right side up for transport back to lab.
Weigh flasks in order to estimate the amount of leachate. Filter leachate into 20 ml plastic scintilation vials. Freeze leachate samples until analysis can be run. During freezing temperatures, the leachate in the Erlenmeyer flasks may freeze and crack the glass flasks. This may be avoided by tilting the flasks in the cooler so the leachate can freeze and expand across the length of the flask.