Major Sewer Improvement Effort

Traffic Alerts

OSBORNE AVENUE, 20TH STREET AND LA PAZ

SEI Project: Osborne Avenue Closure Postponed
Mar 15, 2017

OSBORNE AVENUE, ARMIJO STREET TO 21ST STREET

SEI Project: Osborne Avenue Closure
Feb 24, 2017

29TH STREET, I-10 TO 12TH AVENUE

SEI Project: Sewer Install at 29th Street
Feb 10, 2017

36TH STREET, 6TH AVENUE TO 4TH AVENUE

SEI Project: 36th Street Waterline Relocation
Jan 6, 2017

36TH STREET, 6TH AVENUE TO 4TH AVENUE

SEI Project: 36th Street Waterline Relocation
Dec 22, 2016

25TH STREET, OSBORNE AVENUE TO THE FRONTAGE ROAD

SEI Project: 25th Street Closure
Oct 21, 2016

18TH STREET, OSBORNE AVENUE TO THE FRONTAGE ROAD

SEI Project: 18th Street Closure
Sep 21, 2016

17TH STREET ACCESS CLOSURE

SEI Project: Amended Traffic Alert
Aug 18, 2016

Project Information

Pre-Construction Open House Invitation 

Segment 1 Open House Presentation

SEI Segment 1 Fact Sheet

SEI Full Project Fact Sheet

Segment 2 Open House Presentation

SEI Segment 2 Fact Sheet 

SEI Full Map

SEI Northern Boundaries Map

SEI Southern Boundaries Map

SEI Upcoming Road Closures 

Southeast Interceptor Sewer Augmentation (SEI) Project

The Pima County Regional Wastewater Reclamation Department (RWRD) and its contractor, KE&G Construction, Inc., will soon begin constructing the Southeast Interceptor Sewer Augmentation (SEI) project, a 2.6 mile project, which extends south from Simpson to 36th Streets and east along 36th Street between 7th and Euclid Avenues. The SEI project will upgrade a portion of the existing SEI to address capacity limitations between Simpson and 36th Streets. Ultimately wastewater flows from a new Old Nogales Highway interceptor, including developments along the planned Aerospace Corridor, will also be conveyed by the SEI project.

A new 36-inch to 42-inch diameter sewer interceptor pipeline will be installed, in addition to the sewer installation. Construction activities will also include drainage improvements, odor control facilities, bypass pumping, asphalt paving and waterline relocations.

Ultimately wastewater flows from a new Old Nogales Highway interceptor, including developments along the planned Aerospace Corridor, will also be conveyed by the SEI project.

Construction will take place along the eastside of Interstate 10 from 17th to 36th Streets and east along 36th Street from 7th to Euclid Avenues. There will also be some construction activities along the newly designed Greenway path.

RWRD is employing the Construction Manager at Risk (CMAR) approach, which relies on the construction expertise of the Contractor (KE&G) and ability to cooperatively work with the Design Consulting Engineer (Westland Resources) to avoid potential problems and to minimize costs wherever practical. It allows the Owner, Design Consultant and the Contractor to effectively work together as a team to complete the sewer interceptor augmentation project.

The SEI project is scheduled to begin Spring of 2016. The traveling public should expect delays and lane closures when driving, bicycling, or walking in the area. For your safety, please observe all traffic control signage, message boards and obey reduced speed limits.

For project updates or to find out more information, fill out our form below.

Pima County