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SYSTEM OPERATION AND MAINTENANCE
properly the utility may be damaged. Insure that select backfill goes in the hole first. The Utilivac tends to keep the soils stratified in the hopper, so the last soil removed from the hole (from around the utility), will be on the top layer in the hopper. Dumping the hopper away from the hole will allow you to shovel or sweep the select material back into the hole first. When working under pavement, backfill only 12" - 18" at a time then tamp thoroughly. If it is available to you, we recommend using a pneumatic tamper (Figure 26). This will insure that your test hole will not cave in and cause a pothole. A pneumatic tamper will also help tamp the asphalt patch. If you use cold patch asphalt, make sure the area is dust free to insure a good patch. Broom the border of the pavement cut before applying the cold patch. Dusting the patch after it is done with road dust will help prevent it from sticking to tires and shoes.
Tear Down and Clean Up
Equipment tear down is basically opposite of the setup procedure. Just remember to shut off the air supply at the compressor first and then relieve the pressure from the hoses. Squeeze the trigger on the air lance and open the hand operated valve (or foot operated valve) on the vacuum generator. This will drain the lines. When all the air hoses are completely unpressurized, it will be safe to remove the safety clips and disconnect hoses. Inspect the vacuum generator. Remove any debris that has accumulated inside the vacuum chambers.
