As stated in Section 3.2.3, bullet 4 a, b, and c of the ASGI, equipment blanks should be collected at the beginning of sampling and at least once each day after decontamination. Equipment blanks are usually collected following decontamination of non-dedicated equipment to evaluate potential cross contamination from the sampling equipment. Usually, one or two equipment blanks are collected per day. In addition to tubing, items subject to equipment blank testing are push rods, auger flights, glass sampling syringes, and pressure gauges. The most common method of collecting an equipment blank is to pour distilled water over a recently decontaminated piece of equipment and collect the water in a container that is appropriate for the analytical method that will be used, which, at a soil gas site, will usually be VOCs. The blank water should be tested for all VOCs that are included in the site’s analytical suite. Drill rods containing contaminated soil should be decontaminated before reuse. If soil gas samplers arrive at the site after drill rig demobilization, equipment blanks should be provided by the drilling contractor. A syringe equipment blank is not an acceptable substitute for the driller’s equipment blank. A syringe equipment blank may be collected by sampling ultra-pure air as it passes through the syringe. Additionally, an equipment blank is recommended for probe tubing and probe tips. The equipment blank for the tubing and probe tips demonstrate there is no residual contaminant carryover from other sites or the manufacturing process (See question 8).