^{Schedule and Process > Details} 

Schedule and Process Details

The following is a general list of construction activities for the LOIS construction process, beginning with final design and access, and concluding with operation of the new sewer line on January 1, 2012. Updates to the project schedule will be provided here.

During construction, sewer service will be maintained for all residents. Detailed information about construction work will be released in advance through monthly Hello LO updates and with individualized letters and meetings for area property owners. Construction updates will also be available on the project website and sent to those who join the project email list. You can join that list by sending a request through the contact us page.

Contents
Final Design and Access	August 2008- June 2009
Out of Lake Work	October 2008 - November 2010
Lake Full Work	June 2009 - September 2010
Lake Down Work	September 2010- Summer 2011
Project Completion	Summer 2011-January 1, 2012

Final Design and Access

August 2008 - June 2009

• Complete Design
• Obtain Permits
• Identify and Secure Construction Access Points

Environmental Permits - Good environmental stewardship requires that construction activities occur in a sensitive way. A comprehensive environmental review process has ensured that the LOIS Project meets or exceeds all environmental safeguards during construction.

The LOIS project team has turned to federal and state agencies for expertise in protecting the lake. As stewards of important federal and state legislation like the Clean Water Act and the Removal-Fill Act, these agencies provide the best knowledge and expertise in waterway and habitat protection. Scientists and biologists from the environmental firm Anchor Environmental were hired to conduct research, submit permit applications and coordinate construction activities with the following agencies:

• United States Army Corps of Engineers (USACE)
• Oregon Department of State Lands (ODSL)
• Oregon Department of Fish and Wildlife (ODFW)
• The Oregon Department of Environmental Quality
• The National Marine Fisheries Service
• The State Historic Preservation Office (SHPO)
• The Grand Ronde Tribe

Through the permit process, all of the above agencies have supported the proposed construction practices for the LOIS Project. The project is in compliance with federal and state regulations and has been granted all required environmental permits to begin construction. Click here for more information about the project approvals the project has obtained.

Construction Access Points - Access into the lake for construction is limited. The identification of access points was a key topic of the agreement signed between the City and the Lake Corporation, and the project team continues to work diligently identifying the best project access points for the project. Neighbors, the Lake Corporation and others have been consulted to identify sites that provide needed access yet try to minimize the impacts to nearby property owners. The goal is to minimize impacts to any one neighborhood to the greatest extent possible.

A project of this size requires storage areas for equipment and places for crew members to park. Since space around the lake is limited (some materials will be stored at the access points mentioned above) two staging areas have been identified away from the lake: the West End Building, East Parking Lot and City owned property on Iron Mountain Blvd., near the Hunt Club.

The project team discussed these staging areas and ways to minimize impacts with nearby neighborhood association chairs, easement association members and nearby neighbors in June 2008 to discuss these staging areas and ways to mitigate impacts.

If you have comments or concerns about one of these access points or identified staging areas, please call the LOIS office at (503) 699-7466 or contact us.

Out of Lake Work

October 2008 - November 2010

• Kelok and Bryant Road Pipelines
  • Construct new sewer pipelines in Bryant Road and Kelok Road.
  • Design and build a new pump station at Bryant Road near the Main Canal.
  • Construct new Bryant Road pump station.
• Foothills Rehabilitation
  • Rehabilitate existing Foothills pump station.
  • Rehabilitate buried and elevated portions of Foothills sewer lines.

Kelok Road and Bryant Road Pipelines
Striving to minimize impacts, reduce costs and increase sewer capacity, Lake Oswego Interceptor Sewer staff developed a plan to build a new underground pipeline outside of Oswego Lake in Kelok Road. This new pipeline will provide additional capacity for hundreds of homes now relying on much smaller pipes in the Main Canal and Cardinal Drive.

Along with the pipeline, a new pump station on Bryant Road near the Main Canal will be built. The new sewer line will run from the pump station up Kelok Road to Maple Circle where it will pass through the Maple Circle easement to join the interceptor sewer in the lake. A short length of new sewer will also be installed in Bryant Road near the Bridge.

LOIS project staff initiated discussions with the Lake Corporation and with residents living along the Canal at a meeting in May, 2008. The result was broad support for the Kelok Pump-Around option. Discussions have also begun with property owners, neighbors and City Planning staff to design and acquire needed permits for the pump station. A general work schedule appears below.

Kelok/Bryant Road Sewer Pipeline - Project Schedule
Pipeline
Contractor bid award	December 2008
Kelok Road Sewer Construction	January 2009- June 2009
Bryant Road Sewer Construction	June - September 2009
Bryant Road Pump Station
Contractor bid period and award	Fall 2009
Begin - End Construction	Fall 2010

In contrast to the previous plan to rebuild the pipeline inside the Main Canal, the new strategy provides a solution to a small, focused area and saves about $4 million in construction costs. It will also avoid a year-long draw down of the Main Canal.

The existing pipeline in the Main Canal will remain and continue to provide service to properties along the Canal, although the volumes it carries will be reduced significantly by the new Kelok pipeline. The Main Canal line and the laterals which connect it to nearby properties will be inspected as part of this project.

Foothills Rehabilitation and Replacement (anticipated 2011-2012)
Improving the function of the interceptor involves more than just work inside Oswego Lake. Rehabilitation work and some pipeline replacement in the Foothills area will address seismic vulnerability and deterioration of existing pipelines due to age. The pipes in this area were constructed between thirty and forty years ago and require upgrades to continue functioning well into the future. The pump station just outside the entrance to the Tryon Creek Wastewater Treatment facilities requires upgrades as well. Check back for details about the work occurring in this phase of the project. Construction details will be provided when they are available.

Read on for information about Lake Full Construction. 

Lake Full Construction

June 2009- September 2010

• Deep-water ground anchor installation for the buoyant pipe
• Shallow-water pile supported pipe installation
• Pipe fusing and deployment

Throughout the fifteen months of lake full construction, barges will be working all around the lake installing piles for the pile supported portion of the interceptor and anchors, tethers and pipeline for the buoyancy pipeline tethered beneath the lake's surface.

• There will be multiple barges in the lake at any one time.
• Barges come in a variety of sizes, but most will be 20 to 50 feet wide by 100 feet long.
• Barges will remain in place overnight at the last position they occupied prior to the end of the work day.
• They will be required to surround their work area with safety buoys and lights, day and night, all per Coast Guard and Oregon Marine Board regulations.
• Smaller skiffs will transport workers and materials to the barges. They will moor at one of the lake access points which include the Maple Circle easement or the Alder Point easement, the former U.S. Bank property on State Street, or the trestle near the McVey properties.
• Periodically, drilling spoils barges will come to shore to remove soil and rock from drilling operations for disposal.
• The location of these barges can be anticipated a few weeks in advance of when they will be working. Construction will likely start at the westerly end of the lake and move east for anchor work. Barge and other activity in the lake will be updated regularly on the Construction Update page.
• Critical navigation ways and access to personal boat houses will be maintained during construction. There will be periods of time at some locations where access won't be available for short periods of time. Residents will be notified in advance of such an occurrence. Click here for information about navigating around barges.

If you have any concerns, join the project email list (opens in a separate window) to get project updates or contact staff at the LOIS office (503) 699-7466 or via email.

Lake Draw Down

September 2010 - Early Summer 2011

• Lower lake level
• Build new manholes
• Install supports and pipe on piles
• Maintain existing sewer service until all new work is complete
• Connect new pipe to reconstructed near-shore manholes and tie-in upland sewer lines
• Rehabilitate existing trunk sewers in Main Canal, West Bay and Lakewood Bay
• Begin lake refill by March 21, 2011

A great deal of attention has gone into identifying ways to minimize the draw down period and avoid doing it during the summer months. The result is that a lake draw down will be initiated for construction of the LOIS in September 2010. Natural drainage will be supplemented with Tualatin River water to refill the lake in March 2011.

During the lake down construction period, several existing manholes will be replaced and several existing sewer laterals (the smaller pipes from shore that connect homes to the large interceptor) will be replaced or re-routed to upland sewers. Here is a brief summary of the anticipated draw down work:

• Build temporary construction road across the lakebed.
• Construct bypass pumping system to maintain uninterrupted sewer service.
• Establish erosion control.
• Excavate and install pile supports for the pile-supported sections of sewer pipeline.
• Assemble pipeline.
• Demolish and rebuild manholes (replacement manholes will be smaller diameter).
• Connect the new, near-shore manholes to buoyant pipeline.
• Remove temporary roadways.

The sewer system will continue to operate without interruptions during construction.

Project Completion

Summer 2011- January 1, 2012

• Demobilization and site restoration.
• Operation and maintenance preparations.
• System operation begins.