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District News

Posted on: October 31, 2018

2018 Redondo WWTP Shoring Wall Project (Issue 178)

178_Shoring Wall collage 2

The District is nearing the completion of the repairs to the Redondo WWTP Shoring Wall. The wall is located behind the digester (Refer to Photo1).


Consultant Engineer: Robinson Noble, Inc.

General Contractor: Condon-Johnson & Associates, Inc.

Project Cost: $511,500.00.


The existing, tied-back soldier pile wall (approx. 40-foot in length), constructed in1981, was in very poor condition with a number of pieces of lagging having failed due to dry rot (Refer to Photo 2). The District was concerned with slope stability behind the wall based on the deterioration of structural integrity of the wall and slope movement above the wall. The District contracted with Robinson Noble, Inc.in 2017 to design a solution to strengthen the structure of the wall. The project consisted of the installation of 1,400 square-feet of new reinforced shotcrete wall tied back with double corrosion-protected tiebacks (Refer to Photos 3 & 4).The District anticipates the project will be completed by the end of October, 2018.

See Newsletter #178 to view larger images
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