Joint Outfall B Unit 1A Trunk Sewer Rehabilitation Phase 2

Introducing the Joint Outfall “B” Rehabilitation Project! This remarkable endeavor is taking place in the city of Carson Ca.  Where a 144″ diameter reinforced concrete sewer has faithfully served millions of users for an impressive 60 years under the Los Angeles County Sanitation Districts (LACSD). However, with the passage of time, the pipeline began to show signs of wear and tear, necessitating a major restoration effort.

To breathe new life into this vital infrastructure, LACSD opted for an innovative solution: sliplining the system with a 133″ OD diameter RPMP. This approach aimed to restore the trunk sewer’s structural integrity, which had suffered from moderate to severe damage caused by hydrogen sulfide corrosion.

One essential aspect of this restoration project is the grouting process. Grout ports, thoughtfully placed inside the pipe, are being utilized to inject a cellular concrete grout material. This ensures a robust and durable result, with a minimum requirement of 300 PSI for the grout material used.

One of the challenges on this project are the live flows from local laterals left in service during the rehab process which make it critical to grout the annular space in lifts to prevent damage to the pipe during grouting operations.