Hidden Lake Pump Station Replacement and Sewer Improvement Project
home page > Construction Photos > Boeing Creek Park

Construction Photos -- Boeing Creek Storage Facility
Click on thumbnail to view larger image.

The new underground storage pipe will temporarily store up to 500,000 gallons of wastewater during large storms and help reduce overflows to Puget Sound.

Refer to the construction in and around Boeing Creek Park (JPEG) and the project key map -- drawings C111 and C112 -- for plan views of this pipe.

July 2008 | October 2007 | May 2007 | Sept. 2006 | Aug. 2006

July 2008. Boeing Creek Park update.

Permeable pavers were installed at the 3rd Avenue NW entrance to allow support for maintenance trucks accessing the underground odor control facility.

Plants in the Pacific Northwest wildflower mix used to restore the area will continue to vegetate the pavers.

Soil and vegetation will allow rainwater to sink into the ground below, reducing storm water runoff.

Circle of Cedars -
Natural-looking rock walls were installed to protect the slope by the "Circle of Cedars" that once surrounded a hunting cabin.

The only above ground structure in Boeing Creek Park is an odor control stack disguised as a tree snag.

Birds have been sighted perching on the "branches" of the tree snag.

The City of Shoreline is making additional park and stormwater improvements in Boeing Creek Park in summer 2008.

Trails running through construction areas were restored and the adjacent areas seeded with a wildflower mix.

October 2007. Storage Facility now complete! View photos from Boeing Creek Park neighborhood celebration, Oct. 20, 2007.

May 2007. Progress to date:

• Construction of a channel in the bottom of the 12' diameter storage pipe in Boeing Creek Park
• Construction of a new sewer in 10th Ave NW by microtunneling and trenching

Workers installed a channel at the bottom of the underground storage pipe to convey normal wastewater flows.

Another view of the channel along
the bottom of the pipe.

Work in the City's stormwater pond.

Workers install a manhole in 10th Ave. NW

The underground odor control structure should be completed by fall 2007

Street sweeping to control dust.

A carrier pipe was installed by the microtunneling machine. A smaller sewer pipe will be installed inside.

       
A microtunnelling machine was used to install a
new sewer under 10th Ave NW.

Microtunneling support and equipment.

Staging of materials and equipment along 10th Ave NW

September 2006. Progress to date:

• About 650 feet of the underground storage pipe has been installed in Boeing Creek Park
• Excavation of two of three underground structures is complete.
• Construction of a microtunneling machine access shaft to install a new sewers in the streets near the park has begun on 6 th Avenue NW.

Trenches for the underground storage pipe and deepening of the city's storm water detention pond.

Signs and fencing protect trees in the park. Small trees were transplanted in neighboring Shoreview Park . Suitable older trees were kept in the park for use as habitat logs.

Pipe sections are either straight or curved so the pipe can go around a corner. Each piece is 12 feet in diameter and weighs about 30 tons.

Laying the underground storage pipe is a complex process that requires a team of workers.

The new section of pipe will be fit into the existing pipe in the trench.

Crews attach suspension systems, or rigging, to pipes.

Workers stretch two rubber gaskets across the collar of the pipe. The pipe end is greased to allow the pipe sections to slide together easily.

Each section of pipe is lowered carefully into the trench with a crane that can lift 240 tons.

Sections of pipe are slid together. Once sealed, the pipe is inspected.

back to top

August 2006

Steel beams and sheets are installed to shore the trench where the storage pipe will be laid.

Storage pipe sections are stabilized in place before additional sections are added. The wastewater storage pipe in Boeing Creek Park will require 69 sections of pipe.

Pipe sections are made by Hanson Pipe & Precast manufacturing plant in Tacoma and hauled to the Boeing Creek Park construction site. Each piece of pipe is at least 30 tons (60,000 pounds), 10 feet long, and 12 feet inside diameter. As you can imagine, they are shipped as oversize loads!

A large crane capable of lifting 240 tons (480,000 pounds) is required to move pipe sections from the truck to the trench.

Crane operators require special training and certification to work with such large material. Experience, skill, and timing are critical for proper placement of pipe sections. Sections of pipe that have bends are even more challenging to handle because of their off-balance center of gravity.

Workers grease pipe ends so they join together smoothly.

A team of workers guides the pipe section to keep it from rotating as the crane lowers it into the trench.

The pipe section is slowly and carefully maneuvered between steel reinforcing beams in the trench.

The primary suspension cables used to lower the pipe into the trench are removed. A secondary suspension system is used for fine manipulations to fit the new pipe section into the already installed segments.

Once pipe sections are assembled, the new section of pipe is bedded and backfilled with Controlled Density Fill (CDF), a self-compacting, self-leveling material that hardens into a strong backfill material with minimal settlement.