Project Description:

The Lower Northwest Interceptor is a 17.6 mile project which combines gravity sewer trunk lines,
pumping stations, force mains, river tunnel crossings and other appurtenant components of this
critical section of the regional sewer needs. Growth in the Sacramento area had made this project
a priority with limited time for design and construction. The Program Management team, headed
by MWH, was responsible for overseeing the six design firms selected by the district to provide
design services, permitting, construction management, right of way acquisition and construction of
the entire project. This project was substantially completed in February, 2006 and is one of the
largest public works project completed in the Sacramento Area. Total project cost was $592
million.

​CTA Engineering & Surveying was
selected by MWH and SRCSD to provide the
various surveying, mapping and platting
services for the project. These services have
included 1st Order GPS control, aerial
photogrammetric control, boundary
surveys, detailed design surveys and the
construction staking for the project.
Approximately 230 parcels were
affected by the interceptor right of way needs
and CTA Engineering & Surveying
provided the plats and legal
descriptions for all right of way
acquisitions. The base mapping was also
incorporated into a Project GIS system to assist in tracking rights of entry, permits, right of way
acquisitions, construction and other community and owner sensitive issues.