WATER / WASTEWATER
Prospect Construction, Inc. was founded with a focus on water and wastewater treatment plants and pump station, and today, we maintain a relentless pursuit of excellence and growth in this area. The vast experience of Prospect’s team members has allowed us to successfully complete some of the most challenging projects in the water and wastewater construction field, most of which have involved improving existing plants and pump stations, while maintaining the operation of existing facilities. Our highly skilled personnel have the ability to look ahead, resolve problems, work effectively with clients, and make your project a success.
The existing Sumner WWTP capacity was increased to 6.10 mgd through this project, which required significant planning and flow diversion to maintain seamless operations of the existing facility. The improvements included modifications to the existing influent pump stations, installation of new grit handling equipment, modifications to the existing primary sludge pump station and existing Aeration Basin Nos. 1 and 2, construction of Aeration Basin No. 3, installation of a fourth aeration blower, construction of a new secondary clarifier with aluminum dome cover, construction of a new RAS/Scum pump station and chemical storage building, installation of additional UV effluent disinfection equipment, construction of a new sludge truck canopy, construction of a new centrate pump station and new centrate holding tank, and construction of a new storage equipment building.
Gig Harbor WWTP
Both phases of construction significantly increased the capacity and treatment capabilities of the Gig Harbor Wastewater Treatment Plant. Located on an extremely small, sloped site, the work required extensive coordination between the construction, engineering and plant operation teams to facilitate success. The project included the following: Site clearing, grading, and major excavation; modification and demolition of existing facilities and structures; new process buildings, concrete tanks and retaining walls; extensive process piping and new equipment in all areas of the existing plant; installation of owner-supplied equipment; improvement to instrumentation, control, telemetry and power systems; fiber optic telemetry cable installation from the Wastewater Treatment Plant to the City’s Pump Station 2A, located at Ruth M. Bogue Park, and final surfacing and landscaping improvements.
Barton Pump Station
The small site located at the entrance to the congested Fauntleroy Ferry Terminal added unique challenges to the already difficult and technical work of the Project. The purpose of this project was to upgrade the existing pump station to extend the useful life of the facility, improve reliability, operability and safety. The work included rehabilitation of the existing pump station to include new structural and mechanical components, construction of a new valve room within a sheet pile cell attached to the existing pump station, construction of a new odor control structure to house equipment, wet well bypassing, demolition, jet grout soil improvement, pumps, ground anchors, and site improvements.
Ship Canal Pump Station
Located at the historic Ballard Locks, the Lake Washington Ship Canal Pump Station Project comprehensively rehabilitated the existing pump station, which is utilized to dewater the small and large locks for maintenance and cleaning. The project was severely complicated by its location within a 26-foot diameter by 65-foot deep dry basement well located directly below the Administration Building. All work required accommodating severe overhead height restrictions, limited side access and no direct vehicular access. Demolition included lead abatement work, removal of pipe up to 60 inches in diameter, removal of multiple valves up to 30 inches in size, and two 30 volute pumps. Supply and installation work included new pipe and valves up to 60 inches in diameter, a new 42-inch submersible pump set deep within the shaft, process pump control components complete with remove operation, new oil water separator system, a small lock pump and associated piping, replacement of 14 inch piping under the large locks to the small locks within a confined tunnel, reconstruction of multiple levels of platforms and provision of a new 480v unit substation and motor control center. In addition, Prospect partially disassembled historic motor casings and valve actuation machinery and retuned historical equipment components to their original locations upon completion of the contract.