Over the last decade, BHC Consultants’ Engineering team has provided project planning, design, and construction management services for water management projects throughout Washington State. Specific services include:

 

 

BHC Consultants prepared plans and specifications for safety and security upgrades to the existing 1.0 and 1.5 MG Bainbridge High School reservoirs - a pair of welded steel, ground storage water tanks approximately 90 feet high. Improvements included the addition of new exterior ladders, landings, and cages; fall protection systems; rooftop railings; and anti-climb intrusion protection features for ladders and overflow pipes.

 

Work included coating inspection (including an estimation of remaining coating life), specification for underwater patching of weld damaged coatings, and cost estimates for future tank repainting. Additional work included vent redesign with custom removable screen, vacuum/pressure relief, and anti-intrusion features.

 

Design completed in 2006.

Construction planned for 2007.

 

Water System Inter-tie Design, City of Sultan, WA

BHC Consultants designed 6,000 linear feet of new 12- and 16-inch inter-tie lines for the City of Everett’s transmission main, in order to supplement existing water supplies for the City of Sultan. Two alternative routes were investigated, with costs and impacts evaluated for different combinations of pipe sizes, pressure-reducing valve locations, and water reservoir height and diameter. Hydraulic analyses were performed to optimize the pipe diameters and control valves in various pipe reaches. 

The City of Sultan has operated its own spring-fed water source for nearly a century. A filtration plant rated at 1.36 million gallons per day provides treatment. In 2004, growing population demands for water led the City to construct a supply pipeline for the City of Everett Pipeline No. 5 and a supplemental source of supply.

 

BHC Consultants developed a new water system plan for the City of Sultan. The system includes two storage reservoirs of 1.1 and 1.5 million gallons. The northeast part of the system is served through a booster pump station. The distribution system totals about 25 miles of pipe ranging from 4- to 14-inches in diameter with three pressure reducing stations.

 

The distribution system was hydraulically modeled using WaterCAD software calibrated to the most recent fire flow testing. The pipe system was then evaluated under 2008 and 2025 Maximum Day Demand, plus fire flows at selected locations, to identify piping deficiencies. These facilities were assembled into a capital improvement program.

Waterline Crossing, City of Bothell, WA
BHC Consultants provided project coordination, plan review, design and contract document preparation for a 14-inch waterline crossing under the Sammamish River. BHC coordinated the work with City of Bothell staff to maintain project progress; revise existing drawings to reflect recent construction; and show the connection, details, and location of the waterline on the south side of the river. The City's standard construction contract documents were revised to include directional drilling specifications and bid item quantities. The City's technical special provisions were reviewed to ensure they met the intent of the design.

The successful use of directional drilling on this project avoided significant environmental impacts and permitting issues, allowing the City to put the much needed water line in service earlier than any other alternative approach would allow.