Methodology
Two fully staffed crews manually jetted all wellpoints, with a third crew following behind hooking up headers and pumps. We installed wellpoints at an average depth of 19′ below existing grade, with 800′ maximum footage on a single system. We also utilized siphon drop tubes in areas where a 20′ jet tool could not be used due to overhead power
lines. A siphon drop tube allows installation of a small 1” PVC piece into an existing wellpoint, so that the vacuum is applied at the bottom of the wellpoint instead of at the top. This allows us to drop the water in the wellpoint down to inches instead of the typical 3’. Our manual installation method and fielding multiple crews allowed us to maintain the pace desired by the customer. Approximately 25,000 linear feet of wellpoints and twelve horseshoe style systems were installed.
Diesel driven centrifugal and rotary wellpoint pumps were used along with trash diaphragm pumps. We had our crew on 24 hour pump watch to ensure continuous operation of our pumps to keep the project moving according to the customer’s timeline.
Challenges
The fast working pace was initially a challenge. However, adding in more crews allowed us to move quicker. With the overhead power lines, we also had to adjust our original plan to utilize the siphon drop tubes in much of the area. Our ability to adapt to these changes and challenges allowed us to keep moving forward to a successful and timely completion.
Project Contact:
James Redmond
Minnesota Limited
Project Value:
$4.4 Million
