
WATER / WASTEWATER Treatment Plants

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.
Keystone Projects
King County - Design Bid-Build
Engineer: Jacobs
The Contract work was located at West Point Treatment Plant (WPTP), 1400 Discovery Park Boulevard, Seattle WA 98199. WPTP is an active wastewater treatment plant that must remain operational 24 hours per day and 7 days per week. The primary purpose of this Contract was to replace the existing four engine driven raw sewage pumps located in the 704 Raw Sewage Pump (RSP) Building with four larger capacity variable speed motor driven pumps including various structural improvements, mechanical, electrical, HVAC and instrumentation and control (I&C) improvements. The work also includes improvements to improve the structural resiliency of the building. In addition, the work includes the replacement of the three hot water boilers in the 705 Fine Grit Handling Structure including various structural, mechanical, electrical, HVAC and I&C improvements to support the boiler replacement. All iron and steel products used in this Project must be produced in the United States (American Iron and Steel, AIS, requirements apply to this Project).
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A second component of work was associated with replacing the existing grit classifiers and cyclones located in the 705 Fine Grit Handling Structure with new washer/classifiers and associated cyclones. This work further included installation of a new fire alarm control panel and replacement of associated grit feed piping, overflow and drain piping, water and air piping, hot water supply and return piping, unit heaters, valves and gates, and associated electrical, structural, mechanical, and I&C improvements.


East Helena Headworks - East Helena, MT
City of East Helena - Design-Bid-Build
Engineer: RPA
The project consists of the construction of a new influent pump station for 3ea 36" centrifugal screw pumps along with a new headworks building that provides mechanical screen and grit removal equipment. There are also associated improvements to the existing metals removal building for the wastewater treatment plant NPW lines and the replacement of 2ea vertical turbine pumps.
LOTT Digester System Improvements Phase 2 - Olympia, WA
LOTT Clean Water Alliance - Design-Bid-Build
Engineer: Parametrix
The project will upgrade and replace aging digester equipment and make modifications to improve the operability of the system. Key project tasks include replacement of the floating digester covers with fixed covers, replacement of the gas mixing system with linear motion mixers, and replacement of the existing candlestick waste gas burner with an enclosed waste gas burner. Each digester will be outfitted with new equipment including a standpipe, emergency overflow system, gas system piping and gas safety equipment.


South Treatment Plant Influent Pump Station Upgrades Project - Renton, WA
King County - GC / CM
Engineer: KC, B&C, Jacobs
King County’s South Treatment Plant (STP) was built in the 1960s in Renton, WA and is one of the County’s three regional treatment plants. On average, the STP treats over 70 million gallons per day (mgd) of wastewater from communities in Bellevue, Auburn, Issaquah, Kent, Renton, and Sammamish. The STP Facility Program (STPPgM) is underway to address aging infrastructure, improve resiliency, and protect environmental and public health. The STP Influent Pump Station Upgrades Project is the first to be delivered by the STPPgM and consists of three Work Packages. Some Work Packages may involve elements that are delivered early to meet schedule objectives; these elements are defined as Early Work Packages. The Project’s primary objective is to repair and replace infrastructure components that have reached end of useful life and improve seismic resiliency. The scope of the GC/CM contract for the STP Influent Pump Station Upgrades Project will be focused on the following Work Packages:
1. Recoating the division channel to address aging infrastructure and support continuous operations
2. Replacing raw sewage pump #3 (RSP3) to improve plant reliability, energy efficiency, and resiliency
3. Enhancing the Influent Pump Station building’s seismic resiliency to reduce risk of catastrophic failures. Overall project goals include replacing equipment at the end of its useful life, repairing infrastructure, and improving our ability to maintain service, should major seismic events occur. Work Packages currently anticipated to be included within the proposed GC/CM scope include: 1. Division Channel Recoating 2. Raw Sewage Pump #3 (RSP3) Replacement, potentially including raw sewage pump and drive equipment procurement as an Early Work Package 3. Influent Pump Station Seismic Upgrade, potentially including bridge crane procurement as an Early Work Package.
Sheridan Clarifiers Replacement Project - Sheridan, WY
City of Sheridan - Design-Bid-Build
Engineer: DOWL
The project consisted of the removal & replacement of two secondary clarifier mechanisms within the existing concrete clarifier basins including the center support columns, access bridges, clarifier drives, sludge collection headers, arms, and scum box, inlet baffles, FRP scum baffles, FRP v-notch weirs, replacement of floor pressure relief valves, scum pump installation, electrical improvements, and associated concrete and asphalt repairs. All of the work needed to be closely coordinated with the plants operation team to ensure continued operation of the treatment plant. PCI performed the work over the winter to ensure the clarifiers were back online on schedule.

