Summer visitors to Discovery Park will hear some construction noise and see changes made near the West Point Treatment Plant as King County updates the plant's water reservoir to meet current standards and allow safe and efficient access for annual inspections required by Seattle Public Utilities.

King County Wastewater Treatment Division spokesperson Eunice Lee presented the project to Seattle residents at a public meeting on Feb. 23.

“We wanted to provide information to the public about this reservoir modification project,” Lee said. “We recognize because this project is located in Discovery Park, the public will see the construction, they'll see the impact, plus the restoration King County will do afterward. It'll be a pretty visible project. At this point, in terms of the timeline, the construction will begin in late summer of 2019.”

The construction will last three to five months, Lee said. Updates include installing a 460-foot pipe from the underground reservoir into a discharge site to protect the area from overflow.

The reservoir has been in the area since the 1960s and has two underground tanks. One tank is filled with drinkable water (C-1) and the other is processed water (C-2). The drinkable water serves the West Point Treatment Plant, park water fountains and the park's lighthouse. The processed water is used for industrial purposes at the treatment plant.

Besides the new pipe, an aboveground entryway to the tanks will be built, Lee said.

Project construction is estimated to cost King County $1.4 million.

“One of the concerns we wanted to address is how trails in the park will be impacted,” Lee said. “There are two trails that will be temporarily disturbed during our construction. Those trails are Loop Trail and the new Capehart Trail. They won't be closed for the whole three to five months of construction.”

For Loop Trail, there is a 0.2-mile section where construction vehicles will have access. Construction vehicles will be led by on-foot flaggers to warn hikers and runners about incoming equipment. For Capehart Trail, a temporary detour will be created during a portion of the construction.

According to the King County Wastewater Treatment Department documents, about 26 trees were recommended for removal to complete the project. Lee said her department is dedicated to planting two new trees for every tree it removes to finish the pipe installation. After construction is finished, workers will help restore the area by planting the new trees, seeding the fielded area, removing invasive blackberry bushes and planting new shrubs.

Click here for more information about the project.

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