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• GEOSTRAT <br /> EGIES <br /> FIELD METHODS AND PROCEDURES <br /> VES Va or Stream Sample Collection <br /> Influent and effluent vapor stream samples are collected by connecting the sample bag to <br /> the sampling port via clean tygon tubing. The sample bag is then placed inside the air <br /> sampling container, which is attached to an air pump. To obtain a sample from the VES <br /> vapor stream, the air pump is activated, inducing a vacuum inside the sample container. <br /> The induced vacuum allows the sample bag to inflate by drawing an air sample from the <br /> VES vapor stream via the sample port and tubing Once the sample bag is full, it is placed <br /> in a separate container to protect it from sunlight, and delivered to the laboratory for <br /> analysis. <br /> • <br /> • <br />