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GEOPROBE OPERATION _. .__ CATEG • • GEO 4.12 March 1998 5.2.5 Shutdown After the rods have been extracted from the ground, the Geoprobe 8-A is ready to be shut down and moved to the next sampling location. The following procedures should be followed when securing the Geoprobe 8-A: • Place the toggle switch in the middle (slow) position, push the PROBE lever down, and lower the hammer assembly to the bottom of the derrick. • Lift the FOOT lever to raise the foot completely. • Push the EXTEND lever down to fully extend the derrick. • Check to make sure that all hydraulic and electrical lines are clear of the derrick storage area. • Lift the FOLD lever to fold the derrick assembly to the horizontal posi- tion. • Lift the EXTEND lever to bring the derrick assembly forward into the van. • Move the toggle switch to the off position to shut off the hydraulics. • Turn off the cooling fan on the switch in the rear of the van, and shut off the engine using the remote ignition switch on the same panel. • Remove the exhaust hose from the tailpipe, and remove the chock blocks. Close the doors to complete the shutdown. The Geoprobe 8-A is now ready to be moved to the next location. 6. Subsurface Soil Sampling The Geoprobe 8-A is capable of collecting discrete subsurface soil samples with a special soil sampling probe that is screwed onto the end of the lead rod. The sampler consists of the sample tube, cutting shoe, piston tip and piston rod, drive head, and a piston stop pin. A 2-foot- long acetate liner fits inside the sample tube, allowing the collection of a 2-foot-long soil sample. The following steps describe the procedures to follow when collecting soil samples: • Assemble a clean, decontaminated soil sampler. Attach the drive head to the sample tube. Insert the acetate liner with the lip toward the cutting 11