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page 5 <br /> Drilling and sampling procedures <br /> Well bore vapor sampling <br /> After the wells have been purged and allowed to equilibrate, vapor samples may be <br /> collected with a small vacuum pump from just above ground water in each of the well <br /> bores. Teflon tubing is lowered to approximately one foot above the ground-water surface, <br /> the well bore is covered, and air is pumped through the tubing into a chemically inert <br /> Tedlar bag that has been pre-cleaned and purged. The Tedlar bags are then labeled and <br /> transported to a state certified analytical laboratory to be analyzed for carbon dioxide <br /> content. <br />