Trigon Associates, llc

South Shore Basin Rehabilitation Design

Sewerage and Water Board of New Orleans

  • New Orleans, Louisiana
  • Completion: Ongoing

As part of a large sewer program being performed by the Sewerage and Water Board of New Orleans, this work consists of the design of multiple projects for the rehabilitation of sewer facilities in the South Shore Basin of New Orleans.

The rehabilitation measures being designed are intended to restore structural integrity and eliminate significant sources of infiltration/inflow and include manhole rehabilitation (e.g., frame and cover replacements, horizontal and vertical adjustments, internal lining of manhole walls) and gravity sewer line rehabilitation for small and large-diameter sewers (e.g., excavated point repairs, full line replacements, cured-in-place pipe lining, sliplining, pipe bursting, service lateral replacements).

It is anticipated that approximately $15M of rehabilitation construction will result.


The general services provided as part of this project include:

  • Preliminary Design—including development of remedial measures, construction contract packaging, development of a Preliminary Design Report, and presentation to a Technical Review Committee
  • Final Design—including preparation of plans and specifications, cost estimates, and obtaining permits for multiple construction contracts
  • Bid Phase Services—including advertisement of contracts, pre-bid conferences, addenda preparation, bid tabulations and award recommendations
  • Engineering Services During Construction—including reviewing submittals and shop drawings and responding to contractor requests for information and clarifications.

A GIS is used to develop the rehabilitation plans for each construction project. Coupled with standard specifications, these plans form the basis for the construction contract documents.

Trigon is providing engineering services through all project phases as a sub-consultant.

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