Program Delivery Plan

SECTION 4. CENTRAL BASIN PROJECTS
4.1 Central Gravity System Comprehensive Rehabilitation
Projects
4.1.1 CGS-R-0001, CGS-R-0002, CGS-R-0003, CGS-R-0004, CGS-R-0005, CGN-R-
0001a, CGN-R-0001b, and CGN-R-0002
Project Description
The sanitary sewer system comprehensive rehabilitation projects consist of improvements to
various components of the collection system to reduce the amount of infiltration and inflow
that enter the system.
Purpose
The purpose of comprehensive rehabilitation is to correct defects in the system such as offset
pipe joints, collapsed pipe sections, leaking manholes, and direct inflow sources. The water
that enters the system through the defects is a major contributor to SSOs. Comprehensive
rehabilitation of the collection system will contribute to alleviating SSOs.
Location
There are eight rehabilitation projects located within the Central Gravity Basin. The
locations of the projects are shown in Figures 4-3 to 4-9.
Scope of Project
The first phase of comprehensive rehabilitation projects will consist of the physical
inspection of the pipes and manholes including CCTV inspection. Smoke testing may also
be included in the physical inspection phase.
The data collected by the physical inspection contractor will be analyzed and, based on that
analysis, a listing of recommended repairs with associated construction costs will be generated.
An engineering firm will then complete detailed design and preparation of construction
documents for project bidding.
The construction of comprehensive rehabilitation projects will typically include the
following components::
Replacement of pipes
Point repair of pipes
Rehabilitation of pipes by cured in place pipe liners
Rehabilitation or replacement of manholes
Repair of sewer laterals to the property line
Cost
The estimated construction cost for each project is presented in Table 4-1. These costs are
based on preliminary estimates of the amounts for each component of the system that will
require repair or replacement. During the physical inspection phase, the actual condition of
the components will be assessed and appropriate methods recommended. At that time, the
cost estimate for each project will be revised. For those projects under construction, the bid
amounts were included as construction costs in Table 4-1.
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