The City of Cashmere owns and operates a lagoon system wastewater treatment facility (WWTF); however, the WWTF’s treatment capacity was not able to keep up with recent increases in environmental regulations. RH2 was tasked to prepare a Facility Plan and design upgrades that will meet the new total maximum daily load phosphorus limitations. The WWTF [...]
The Roseberg Interceptor Rehabilitation project, which is currently being constructed, will remove root intrusions and reduce I/I in this aging, high-flow 21-inch interceptor at a reasonable cost with minimal disruption to the environment and ratepayers. The project is located on a steep slope in a difficult to access area south of Seattle. To secure a [...]
Meticulous Detective Work Can Save Millions of Dollars Kitsap County was prepared to spend $6 million to reduce the amount of infiltration and inflow received at its Suquamish wastewater treatment plant. Improvements had been identified on a preliminary basis; however, the County wished to further refine their selected improvements. RH2’s studied the system using in-stream [...]
The City of Cashmere’s existing wastewater treatment facility (WWFT) is located on the southern edge of Cashmere city limits adjacent to the Wenatchee River. After treatment, the effluent is discharged to the Wenatchee River. Cashmere retained RH2 to design a replacement WWTF to improve the quality of the effluent being discharged into the river. The [...]
The City of Stanwood retained RH2 to assist with a Biosolids Utilization Plan to update its storage of waste activated sludge procedures. The plan characterized the biosolids as Class B biosolids based on laboratory results. It was also determined that the biosolids contained in Pond No. 2 needed to be removed and land applied for [...]
RH2 was retained to expand the capacity of the Kitsap Peninsula’s Joint Wastewater Treatment Facility in response to population growth pressure. The Washington State Department of Ecology would only allow expansion providing that the mass loading being discharged did not increase above the original limits and that extreme wet weather flows up to 16.0 MGD [...]