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AECOM <br /> 5 INSTALLATION PROCEDURES <br /> Sampling Line 10 <br /> (e.g., 1/4" OD tubing) Sealant <br /> (e.g. clay) <br /> Building <br /> Slab <br /> . .: 06 Probe 0 <br /> ` <br /> i 2 <br /> • •� 5/16,� holey <br /> Fill Material ;� �'1111111 <br /> (e.g., gravel) �'�i *` �r �• �' • <br /> Native Soil—� '• • : - - -_ :'-': <br /> • . NvtiQ siAi <br /> FIGURE 1.SCHEMATIC OF SUB-SLAB PROBE <br /> 5.1 INSTALLATION OF THE SAMPLING PROBE <br /> 5.1.1 Drilling <br /> Drill down into the slab approximately 1 to 2 inches using a rotary hammer drill with a 7/8"diameter concrete bit. <br /> • Clean out the dust using a shop vacuum. Note: Do not use a shop vacuum to clean out the dust from drilling if the <br /> hole extends all the way through the sub-slab.. <br /> • Continue drilling down using a 5/16"diameter concrete bit to below the slab. <br /> • Use the drill bit to measure the thickness of the slab and record the value. <br /> Note: If the slab is very thick(e.g., 18"),the 5/16"drill bit may not be long enough to reach the bottom of the slab. In this <br /> case, use a larger, longer drill bit for the entire length of the slab. <br /> Install the probe into the hole,with the tubing already attached. Use the tubing to hold the union at the correct height in the <br /> hole Oust below the top). <br /> • Use modeling clay(e.g., Sculpe brand modeling clay)or other easily worked material to seal the probe in place. <br /> • Avoid using cement(e.g., Quik-crete)as that will take time to cure and the seal between the cement and the probe <br /> can be inadvertently broken when applying torque to the probe to take caps on or off. <br /> n--- c ..r <br />