Trenchless Step 1 – Excavate 2 Holes

Paul Rowe

Excavation of Old Clay Sewer Line with Tree Roots

Magic Plumbing recently replaced a sewer line for an apartment complex owned by the City of San Francisco. In this installation the objective was to replace the old 8″ clay sewer line that was badly infested with tree roots which had separations between most of the joints. First we excavated a 10 foot deep hole at the sidewalk right next to the curb.

Trenchless Sewer Replacement

This excavation was 6 feet x 6 feet x 10 feet deep in sand. When excavating like this we need to make sure the excavation is always safe. We do this by using sheets of 1 1/2″ plywood on the walls of the excavation, these sheets of plywood are supported by metal screw jacks and 2″ steel pipe to create a very safe place to work.

Trenchless Sewer Repair

After we have dug in the sidewalk and exposed the sewer line we then did another excavation at the building where the existing cast iron pipe connects to the clay pipe. This excavation was approximately 5 feet deep and was approximately 4 feet x 4 feet.

Trenchless Sewer Replacement San Francisco Go To Step 2