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Residential solar shines on despite stalled renewables sector While the global financial crisis and U.S. political blowback on climate change have stalled development of renewable energy, one area continues to grow - residential solar. Wind, commercial solar and other energy sectors have suffered due to the cancellation of Oregon's Business Energy Tax Credit, but the residential market is holding its own due to new leasing programs that allow customers to have solar without high upfront costs.

Working around quiet, residential streets in an affluent suburb, the lake-down contract involved the installation of more than 7,300 feet of previously fused, large-diameter, high-density polyethylene pipe to connect the buoyant interceptor to the existing sewer system.

Working in some of the wettest and most turbulent conditions the Columbia River Gorge has seen in many years, the project team for the John Day Lock and Dam Gate and Sheave Replacement delivered a difficult gate removal with associated improvements on a demanding schedule.

The 29,200-foot-long, 22-inch-diameter tunnel and associated mains, pipelines and diversion structures have significantly reduced the frequency and volume of combined sewer overflows into the Willamette River by providing extra storage and conveyance to a pump station on Swan Island.

Completed in 1936 under direction by then-state engineer Conde McCullough, the bridge was upgraded with modern safety and functionality technologies, including new equipment and computer controls, an HVAC system to protect equipment from humidity, and lighting to improve the bridge operator's view of vehicles and pedestrians.

Completed ahead of schedule, under budget and within specifications, the 30-month project required installation of 8,000 feet of 84-inch and 54-inch diameter pipes via micro-tunneling at depths of 20 to 75 feet to carry sewage and stormwater runoff from the Balch Drainage Basin to the West Side Big Pipe, which collects combined sewage from the west side of the Willamette River and takes it to the Columbia Boulevard Wastewater Treatment Plant.

Working on a tight schedule because of federal funding rules, the design team broke construction into two phases and addressed complex site conditions by using low-density cellular concrete, a method that requires a high degree of coordination between team members.

[...]to keep those chemicals out of the Columbia River, the project team for deicing treatment facility enhancements had to create a new, 12,000-square-foot on-site facility to process stormwater runoff from the airport's ramps and runways.

Wildish Standard Paving Co.Other Team Members: AA Surveying, Anderson's Erosion Control, Cutting Edge Concrete Cutting, Dirt & Aggregate Interchange, Egami, Hatch Western Co., McGee Engineering, Roger Langeliers Construction, Specialized Pavement Markings Credit: Nathalie Weinstein

The project team for the replacement of the Volmer Creek and Johnson Creek bridges on U.S. Route 26 worked closely with the Oregon Department of Transportation to successfully use Accelerated Bridge Construction while delivering a sustainably constructed project.