Laserfiche WebLink
1 <br /> 1"lVZ1 INC <br /> 33 Probe Driving <br /> ' 1 Attach the assembled driveoint PRT point holder, or retractable ti <br /> P P p sampler, to <br /> ' a probe rod and drive the assembly, and subsequent connected rods, to the <br /> i <br /> desired sampling depth If augering is required, the probe shall be advanced <br /> below the bottom of the angered hole such that ambient air will not be drawn In <br /> during sampling Should equipment with an internal combustion engine be used <br /> ' for advancing the probe, exhaust gases and fumes from the equipment shall be <br /> routed away from the probe placement <br /> 2 If the PRT assembly is not used, wrap probe rod threads with Teflon tape before <br /> ' connecting rods to minimize leakage at joints <br /> ' 3 After the base of the desired sampling interval has been reached, disengage <br /> an expendable point by withdrawing the probe rods Pull up the probe rods to <br /> expose the desired sampling interval (typically 0 5 to 3 feet depending upon <br /> ' soil permeability) <br /> 4 To disengage the retractable point sampler, pull up the rods one-half foot and <br /> insert the post-run point popper on extension rods inside the probe rods to <br /> ' dislodge the O-ring sealed retractable point <br /> ' S Check the area around the probe penetration at the ground surface for potential <br /> air leakage Seal the penetration with a hydrated bentonite slurry as necessary <br /> i <br /> 1 <br /> APPENDIX 111 <br /> ' 42270020 025 6 <br />