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Low dig technology

The "low dig" technology used to rehabilitate the water mains does not require the entire length of the water main to be excavated in order to perform the CML.  The added benefits of this process are:

  • less need for trench work
  • fewer traffic disruptions
  • utilization of existing water mains
  • shorter duration of work, lower cost compared to complete replacement.
The CML process generally consist of the following process:

  1. A temporary water main (blue or yellow PVC pipe) is installed along the curb as well as a temporary water service (blue rubber hose) to each building normally connected to the water main.  This temporary water service is connected to the outside tap for residential application.  A wye connection is installed on the outside tap so a garden hose can be connected to the one side, while receiving water on the other side.

  2. Excavation pits are placed at approximately 300 foot intervals along the water main.

  3. Clean the existing water main by dragging metal scrapers through the pipe several times to remove the iron build up.

  4. CML PictureCement mortar line the existing water main using the centrifugal process.

  5. Disinfection and testing of the newly lined water main and return it to service.

  6. Restoration of affected curbs, street, sidewalk and driveways.