As part of the closure of a former underground storage tank at the Big Sandy Wastewater Treatment Facility, Geo Logic used a 7822DT to set a 2.0-in. monitoring well through 4.25 in. hollow stem augers.
Geo Logic, Inc., Clarksville, IN, was retained by Professional Service Industries (PSI) to install a 2.0-in. PVC monitoring well near a former underground storage tank (UST) site at the Wastewater Treatment Plant in Big Sandy, TN.
Sandstone bedrock outcrops are fairly shallow in Big Sandy, so the 4.25 in. augers were a “perfect pairing for the 7822DT to get in to the tight location,” according to Dennis Samsel, Owner of Geo Logic. Limiting access to the site was a steep incline sloping in to the side of the treatment facility where the well was to be installed. “We were able to pull to within a few inches of the side of the building to start augering,” Dennis said.
Soils were continuously sampled from ground surface to bedrock refusal using DT22 (dual tube) tooling prior to spinning the hollow stem augers to depth and building the well through the augers. “The auger pull hook on the 7822DT,” Dennis said, “makes it easy to measure your sand pack as you retrieve the augers and ensure that the well doesn’t get sand locked.”
According to Dennis, the 7822DT is the “perfect sized platform for Geo Logic and our customers because it provides the ‘right’ size with most of the capabilities we need in a package that larger, or conventional truck-mounted rigs simply can’t access. The 7822DT’s size allows us to use our existing truck and trailer options to haul the rig without the complexities and expense of the CDL trucks required by the larger rigs,” Dennis continued. “And for our geographical range, we have adequate power and capabilities, including larger diameter dual tube for prepacks and SPTs, that our customers are asking for.”
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As part of the closure of a former underground storage tank at the Big Sandy Wastewater Treatment Facility, Geo Logic used a 7822DT to set a 2.0-in. monitoring well through 4.25 in. hollow stem augers.
The 7822DT was a snug fit between the retention pond’s slope and the wastewater treatment plant’s building. There was no feasible way to get a truck-mounted rig, or any larger rig, to this location. The rig had to be oriented this way because the hoses would have hit the roof line if the rig had been turned around.
The turn was too tight to leave the auger rack attached to the rig, but it allowed us to use the rig to carry the augers as close as possible to the well location. Between the valve and the building, there wasn’t room to change your mind, but the 7822DT (sans auger rack) was able to negotiate the corner and maneuver into position. According to Dennis Samsel, Geo Logic Owner, the setup and tramming to the location took longer than drilling the well.
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