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GEOPROBE OPERATION CATEGORY: GEO 4.12 March 1998 L I • At the point where the lead rod does not advance and the weight of the van is placed on the rod, move the toggle switch to the full up (fast) position. Push down again on the PROBE lever and continue to push the lead rod. Allow the rear of the van to rise 6 inches off of the ground. When the weight of the van is insufficient to push the rod into the ground, push the HAMMER lever down. When the rod has advanced to the point where the derrick foot is again on the ground, release the HAMMER lever, and push the PROBE lever down until the van rises 6 inches. Repeat this process until the rod is fully driven into the ground. • Raise the hammer anvil to its full height by lifting the PROBE lever, and turn the toggle switch to the off position. Never reach into or around the hammer anvil while the toggle switch is in the on position. The helper then removes the drive cap from the lead rod and attaches the drive cap to the next rod to be used. The helper then attaches the next 3-foot rod section to the rod that has just been driven. • The toggle switch is raised to the fast position, and Steps 2 and 3 are repeated until the desired depth is reached. If the rods do not advance, do not attempt to force them. The Geoprobe 8-A is now ready for the crew to perform the required sampling activities. 5.2.4 Rod Removal After completion of the required sampling activities, the rods may be extracted from the ground by lifting the PROBE lever and raising the hammer assembly. Put the toggle switch in the off position, and lift the hammer latch to remove the anvil. Leave the hammer latch open. Once the helper has attached the pulling cap to the rod, the operator will position the toggle switch to the middle (slow) position and push the PROBE lever down and lower the hammer assembly down to the pulling cap. The operator will turn the toggle switch off and will close the hammer latch under the pulling cap. The operator will place the toggle switch in the slow position and lift the PROBE lever up to raise the hammer assembly fully up. (NOTE: The rods should never be pulled out in the fast position, as this increases the chances of breaking the hammer latch.) The operator will then push the PROBE lever down and lower the hammer assembly sufficiently to clear the pulling cap. The toggle switch is then placed in the slow position, and the PROBE lever is lifted to raise the hammer assembly fully up. The toggle switch is then placed in the off position, and the helper removes the exposed rod and attaches the pulling cap to the next rod section. The sequence is repeated until all rod sections are removed from the ground. 10