Projects

King County is developing the Mouth of Duwamish Combined Sewer Overflow Control Program, anticipated to be their largest CSO control project, controlling up to eight CSO outfalls.

The goal of the project is to restore in-stream and riparian habitat within the Snoqualmie River, reconnect approximately 150 acres of floodplain, reduce flood and erosion risk, and provide benefits to agriculture. This project involves the removal and setback of the Haffner revetment on the right bank of the Snoqualmie River and the removal and

Significant flooding was affecting residences and businesses in Pacific and leading to temporarily closures of Stewart Road E due to overtopping by floodwaters.

Parametrix is providing GC/CM Advisory and PM/CM services for a 10-year program for refurbishment, replacement, and expansion of facilities at Pierce Transit’s bus maintenance and operations base.

The existing Rainier Beach High School is being replaced with a new high school building on the same site.

Since 1997, Parametrix has provided engineering, environmental, and operational services at this active landfill as well as for the closed Ellisforde and Old Okanogan Landfills.

Seattle Public Utilities replaced the North Transfer Station with a modern and efficient facility. Parametrix, as a subconsultant, provided civil design, traffic planning, and permitting. Site design elements include grading, drainage, sewer, water, a combined sewer lift station, and vehicle circulation. The project has a new offsite stormwater drainage system for direct discharge to Lake

Parametrix has provided engineering services to Kootenai County since 1986, beginning with alternatives evaluation and landfill siting and continuing today with landfill gas and leachate management and groundwater monitoring. We designed the Kootenai County Farm Landfill to meet the requirements of the Resource Conservation and Recovery Act Subtitle D Standards. The landfill currently receives more

The new $56 million replacement Factoria Transfer Station was built on the same site as the existing facility, while maintaining operations throughout construction.

Parametrix has worked with Grant County since 1998 to evaluate solid waste disposal options; evaluate new site locations; permit the continued operation and eventual closure of an older landfill; and permit, design, and assist during construction of a new landfill. When we started working with the County the existing landfill was unlined and contributing to