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Gas Tight Fitting <br />Probe Box <br />(optional) <br />Bentonite Grout if Permanent <br />Probe or Hydrated Bentonite if <br />Semi-Permanent Probe <br />CONCRETE SLAB <br />(thickness varies) <br />Tubing <br />(metal, nylaflow, PEEK, teflon) <br />Hydrated Bentonite <br />SUBSLAB FILL <br />(thickness varies) <br />, <br />ADVISORY — ACTIVE SOIL GAS INVESTIGATIONS <br />FIGURE 2 <br />Sub-Slab Vapor Probe Typical Diagram <br />FOUNDATION SURFACE <br />NOT TO SCALE <br />July 2015 <br /> <br />19