Upper Northwest Interceptor
Section 9
Overview
Sacramento Regional County Sanitation District (SRCSD) and Sacramento Area Sewer District, formerly CSD-1, are starting the construction phase of the Upper Northwest Interceptor Section 9 (UNWI 9) and Associated Northeast Area (NEA) Relief Projects.
Both sewer districts have evaluated cost, engineering and public outreach considerations among several alternative alignments. The

Performing maintenance on the drill head
original project design included gravity interceptors, force mains and two pumping stations. Based on evaluations, the gravity flow alternative was selected. This eliminated the need for the two pumping stations and force mains.
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Tunnel Boring Machines – Designed by Local Students. See the winning designs.
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To accelerate project completion and minimize construction impacts to the community, SRCSD and Sacramento Area Sewer District have combined the three projects, which will eventually provide the final link in the Upper Northwest Interceptor.

Drill head punches through end of tunnel
The complete UNWI line will run west along Old Auburn Road, Auburn Boulevard and Greenback Lane, then along Elkhorn Boulevard in North Highlands, through Rio Linda, and finally southbound, parallel to Natomas Boulevard/Truxel Road, where it will tie into the New Natomas Pump Station and the Lower Northwest Interceptor. For more information about each section, please visit the specific SRCSD project Web pages.
Media Coverage of "Big Stan" (8/14/07)
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