As with all vapor-intrusion sampling, you’re encouraged to follow applicable guidance requirements. Cox-Colvin prefers to leak test the sub-slab sample point (Vapor Pin®) with distilled water, and the remaining sample train (canister, tubing, and fittings) via vacuum, as described in the Standard Operating Procedure Leak Testing the Vapor Pin® sampling device via Mechanical Means. Of course, the Vapor Pin® sampling device can also be leak tested with helium or other tracer gases, the same as with other sub-slab sample points. If the method of leak testing is not specified, an alternative can be the water dam.
SOP- Homemade Play Dough for Leak Testing the Vapor Pin® with the Water Dam
VP Leak Testing with Water Dam SOP
Conduct leak tests in accordance with applicable guidance. If the method of leak testing is not specified, an alternative can be the water dam and vacuum pump, as described in SOP Leak Testing the VAPOR PIN® via Mechanical Means
. For flush-mount installations, distilled water can be poured directly into the 1 1/2 inch (38mm) hole.