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As development works to keep pace with Washington’s growing population, communities often find their existing wastewater infrastructure inadequate. BHC Consultants have helped a number of municipalities react to and prepare for this growth. Wastewater services provided include:
- Sewer System Analysis and Design
- Comprehensive Sewer Planning
- Wastewater and Water Reuse System Design
- Wastewater Treatment Plant Design
- Engineering Feasibility Study/Report
- Construction Services
- Hydraulic Modeling
- Capital Improvement Plans and Funding Analysis
- LID and ULID Formation
- Grant and Loan Application Assistance
- Permitting Assistance
- Easement Preparation and Acquisition
- Biosolids Handling Design
- Pump Station Design
- Industrial Wastewater Treatment
Wastewater Project Briefs
Lift Station No. 8 Replacement, City of Lynnwood, WA
The new station will replace an existing station that periodically exceeds its design capacity and is deficient with respect to safety and maintenance access. The project includes:
- Replacement of the lift station with a 1,250 gpm triplex lift station
- A trench-type wetwell to ease cleaning procedures
- An above grade building with a hoist, office, and electrical panels
- An exterior diesel generator in a custom sound attenuation enclosure
- Odor control facilities
- 2,400 lineal feet of 10-inch ductile iron force main
- About 800 lineal feet of replacement 15-inch gravity sewer
- Associated site landscaping and paving
Preliminary design analysis tasks include site evaluation and selection; force main route evaluation and selection; preliminary structure design; research and selection of non-clog sewage pumps; surge analysis; preparation of plans and specifications; and construction engineering services.
Wastewater Consulting Services, City of Lynden, WA
BHC and staff have been involved in several wastewater collection and treatment projects, including the analysis of existing effluent outfall; flood-proofing of the WWTP site; preparation of an application for NPDES Discharge Permit renewal; and the following initiatives:
Wastewater Treatment Plant Evaluation, City of Lynden, WA
The high volume of local development and growth demanded that the City’s wastewater treatment plant either be expanded or re-rated to accommodate the added loadings. The quickest and most cost-effective solution was to revisit the design criteria and loading assumptions to determine whether the additional connections could be made to the existing system. Working closely with DOE, BHC was able to determine that the plant would be capable of accepting increased organic loading.
General Sewer Plan, City of Lynden, WA
BHC is currently preparing a General (Comprehensive) Sewer Plan for the City of Lynden. A computer model is being used to evaluate the city’s wastewater collection, conveyance, and treatment system comprised of 14 pumping stations. Future collection system needs are being identified based on recently adopted zoning guidelines for City UGA boundaries. Wastewater treatment needs include modifications to the outfall for effluent discharges to the Nooksack River.
Engineering Services, Southwest Suburban Sewer District (SWSSD,) Burien, WA
BHCprovided the following services to the SWSSD:
- Preparation of Operation & Maintenance Manuals for Miller and Salmon Creek Wastewater Treatment Plants
- Gas Utilization Evaluation – Miller and Salmon Creek WWTP
- Thickener Analysis – Salmon Creek
- Design Assistance for Salmon Creek WWTP – Mechanical Thickener
- Grant Application Assistance – Department of Energy
- Marians Park Sewer Design
- Marians Park Construction Assistance
- Design and construction services for the Miller and Salmon Creek WWTP
- Design and construction services for the Bio-solids handling facility at Miller Creek WWTP
On-Going Wastewater Reclamation Consultation Services, Carson City, NV
BHC has provided consulting services for several wastewater and reclamation projects as requested by City staff. Projects included:
- Program management assistance for a design report outlining improvements to the wastewater reclamation plant
- Evaluation of over-irrigation at a major reclaimed water reuse site in Carson City
- Analysis of nitrogen and hydraulic loading from reclaimed water at reuse sites in Eagle Valley (Carson City)
- Modeling of the existing reclaimed water distribution system
Sanitary Sewer System Expansion, Phase I, City of Lake Forest Park, WA
The City of Lake Forest Park owns and operates a sanitary sewer utility that currently serves approximately 3,500 customers. Approximately 230 properties within the city are served by onsite sewage disposal systems. Over the years, residents with onsite systems had requested sewer service after experiencing onsite system failure, or when a house remodel called for an upgrade to the onsite system. The City secured a Public Works Trust Fund (PWTF) loan to connect the non-sewered properties. The first phase of the project focused on the design, permitting, and construction of sewers to serve approximately 70 properties. A combination of grinder pump and gravity systems was selected. Approximately 3,500 LF of 2-inch low pressure sewer main was designed and will be constructed, along with approximately 2,000 LF of 8-inch gravity sewer main. Additional work included public involvement and construction support services.
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