Ogden Central Weber Sewer Improvement District (UT)

New regulations and local growth cause need for wastewater treatment plant expansion and upgrade

In response to changing regulatory requirements and the needs of a growing community, the Central Weber Sewer Improvement District recently completed a $135 million wastewater treatment plant expansion and upgrade project. Engineering and design services were awarded by the District. Following 100 percent design completion, the construction manager/general contractor (CM/GC) services were competitively bid based on qualifications as well as price.  The project was awarded in 2008 and local contractors were brought in, creating opportunities for Utah’s construction companies.

Located near 0gden, UT and serving a population of over 200,000, the plant was originally constructed and put into service in 1957. The existing treatment facility had a rated capacity of 45 million gallons per day (mgd), using a single-stage trickling filter process. The project upgrades included construction of a new parallel 30-mgd activated sludge treatment plant, a new headwork’s facility and a new raw sludge pump station. Focus was placed on value engineering directed at emerging areas of design where improvements could be made to reduce construction costs without affecting the process design or overall finished product.

Completed in 2011, the upgrades increased the treatment capacity to 70 mgd, supporting the District’s goal of accommodating projected population growth in Davis and Weber Counties until 2025. The facility was also brought into compliance with current Environmental Protection Agency (EPA) and state of Utah regulatory requirements. This project was recently honored with the Intermountain Chapter of the American Concrete Institute (ACI) 2011 Excellence in Concrete Award.

Valuable cost & time savings

In the end, the project was completed on time and nearly $8 million below the GMP with all savings returned to the District. Because of their heightened awareness and constant collaboration with contractor design and construction teams, the District was able to foresee the cost savings and minimize the amount of money borrowed to fund the project.