CURRENT PROJECTS
CURRENT PROJECTS
The TAI staff includes engineers, architects, construction managers, surveyors, inspectors, and drafting technicians. The team realizes the importance of developing strong client/consultant relationships and strives to earn each client’s confidence, trust, and respect through exceptional service. Trotter and Associates, Inc. is a civil engineering firm making a difference by setting a higher standard. The following are some of the ongoing projects we're currently engaged in.
Work is underway on a new drinking water well to enhance water supply capacity for Aqua Illinois’s water system within the Candlewick Lake community in Poplar Grove, Illinois. The first phase includes drilling Well No. 3 to a planned depth of just over 900 feet. Drilling is expected to continue through the fall, followed by test pumping to evaluate the new well. A subsequent phase will include the construction of a new well house, the installation of an additional iron-removal pressure filter, and other treatment improvements at the existing water treatment facility. Together, these improvements will expand the system’s water supply and treatment capabilities to support the community.
The Village of Roselle's Jerry A. Botterman STP Biological Nutrient Removal Upgrades project includes structural improvements that enhance the wastewater treatment facility while building on the long-term value of existing infrastructure. The project focuses on strategically repurposing existing structures to support updated treatment processes, improve operational efficiency, and provide flexibility for future facility needs. Structural improvements include modifications to the existing oxidation ditch to create separate treatment zones through the addition of new reinforced concrete walls, walkways, covers, and mixer supports. To support uninterrupted treatment operations, construction was carefully phased so only one oxidation ditch was taken out of service at a time. The project also repurposes the former return activated sludge flume area to accommodate new motor control centers (MCCs) and variable frequency drives (VFDs) beneath a new lean-to protective roof structure. In addition, a new masonry chemical feed building was designed with the capacity to accommodate a future second alum storage tank, providing flexibility to support the Village's long-term operational objectives.
The Lewis Avenue Detention Basin Phase I project is a stormwater infrastructure improvement for the City of North Chicago near Lewis Avenue and 20th Street. The project is intended to address chronic flooding within the Southwest Pettibone Creek Watershed by providing additional stormwater storage, reducing peak flows, and relieving pressure on the existing drainage system. Phase I includes construction of a stormwater detention basin, related earthwork and grading, storm sewer improvements, erosion control, restoration, and site stabilization. The basin will temporarily store runoff during major rain events and release it in a controlled manner to help reduce downstream flooding impacts. In addition to flood mitigation, the project includes wetland vegetation. Together with future phases, the improvements are expected to enhance public safety, protect nearby homes and properties, and improve the overall resilience of the local stormwater system. The project is expected to be funded through grant assistance from the Illinois Department of Commerce and Economic Opportunity. Phase I represents an important first step toward reducing flooding frequency and severity in the area. This phase will be completed this fall.
The Primary Clarifier Improvements Project for the Glenbard Wastewater Authority is officially complete. Trotter and Associates, Inc. provided design and resident engineering services for this rehabilitation project, which upgraded aging treatment equipment while improving operational flexibility and reliability. Major improvements included rehabilitation of the Authority’s two primary clarifiers and gravity thickener with new stainless steel collection mechanisms, replacement of sludge and scum pumps, piping, valves, meters, and associated electric and control systems, replacement of clarifier influent and effluent gates with the addition of electric actuators, replacement of large-diameter clarifier effluent piping in their diversion structure, and installation of new thickened waste activated sludge piping from the gravity thickener to the existing anerobic digesters to allow additional operational control of the primary sludge and thickened waste activated sludge. Additional upgrades focused on improving plant operations and odor mitigation by installing primary clarifier launder covers and a new walkable aluminum flat cover over the gravity thickener. Construction was completed while maintaining continuous plant operations. A 47 MGD temporary bypass system was implemented to facilitate installation of the diversion structure gates and large-diameter clarifier effluent piping, while a temporary solids thickening operation maintained the solids treatment processes during the gravity thickener equipment rehabilitation. Project Team Included: Glenbard Wastewater Authority, Trotter and Associates, Inc., Vissering Construction, Dahme Mechanical Industries, Connelly Electric Co., and TRI-R Systems, Inc.
The City of Burlington, WI continues to invest in reliable wastewater infrastructure with planned improvements to the Primary Digester mixing system at its Water Pollution Control Facility. Trotter and Associates provided engineering services for the project, which will replace the existing gas mixing system with a pumped jet mixing system similar to the technology currently operating in the facility's secondary digester. The improvements will support long-term operational reliability and treatment performance. The project went out to bid in January and was awarded to Rohde Brothers, Inc. Construction is planned for the Fall of 2026.
Fox Metro Water Reclamation District is nearing completion of a valve replacement project for the pumps serving the 54" Primary Clarifier Effluent (PCE) and 42" Return Activated Sludge (RAS) force mains. The hydraulically operated plug valves, originally installed in the 1970s, are being replaced with conventional plug/check valve arrangements, along with surge and air-release valves where required. To date, Dahme Mechanical Industries has completed valve installations on all three RAS pumps and three of the four PCE pumps, with the final pump expected to be completed in the coming weeks. Before the mechanical work, a floor shoring system was installed to reinforce a portion of the elevated slab and properly support the new valves. TAI's involvement in this project has spanned from the early planning stages, including structural condition verification, pump system curve analysis, and surge analysis, through the preparation of bidding documents, and now into active construction support.
The City of St. Charles is nearing completion of phase one of the Well No. 8 Water Treatment Plant (WTP) Rehabilitation Project, which includes upgrades to piping, valves, and treatment systems—specifically ion exchange and HMO filtration processes that support radium removal and hardness control. These improvements build on the City’s already high-performing water system and help maintain consistent water quality. Phase two will begin this fall and will include installation and commissioning of the Well No. 14 pump, replacement of the pump at Well No. 8, and electrical and other minor facility upgrades to WTP No. 8. Once complete, these enhancements will increase the available water supply, improve operational flexibility, and strengthen long-term system reliability for the community.
The Village of Addison is implementing a major project to separate combined sewers in the Home Addition area, which is the largest remaining combined sewer tributary in the community. The project includes separating the area's existing combined sewer system, which currently manages both wastewater and stormwater runoff, into separate sanitary and storm sewer systems. About three miles of new storm sewer, ranging from twelve to sixty inches in diameter, will be installed and directed to Salt Creek through an existing 84-inch relief storm sewer. To connect to the existing 20-foot-deep relief sewer, two custom-made junction chambers (10-foot by 12-foot and 8-foot by 10-foot) have been installed. Another key part of the project is building a stormwater detention facility at Cherokee Park, which is the lowest point of the drainage basin and the area most vulnerable to flooding. Since June of 2025, the contractor has completed approximately two and a half miles of storm sewer installation. The remaining sewer work and excavation of the detention pond are expected to be finished in the coming months. Along with storm sewer upgrades, lead water services found during construction are being replaced. So far, 65 lead water services have been taken out of the Village's water system. Once finished, the Village’s sanitary sewer system will experience significantly lower flows during wet weather. This decrease in flows will help prevent basement backups, street flooding, and combined sewer overflow discharges previously suffered by the Village. The project will also lessen the volume of stormwater runoff treated at the AJL Wastewater Treatment Plant. It remains on schedule and is expected to be completed by summer 2026.