CIVIL ENGINEERING DESIGN
The TAI staff has completed numerous water distribution and sanitary collection systems ranging from transmission mains to small distribution systems and force mains to gravity sewers. Replacement or adding new water mains and sanitary systems requires careful planning in maintaining required separation from other utilities and careful consideration of the condition of other utilities and the roadways above them for replacement.
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RELATED PROJECTS
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.

Trotter and Associates, Inc. provided start-to-finish engineering services to the Village of Fox Lake for their 2025 Motor Fuel Tax (MFT) Roadway Improvement Project, delivering support from initial conceptual design through final construction closeout. The project rehabilitated over one mile of Village roads using a strategic mix of reconstruction and resurfacing techniques. The team’s expertise allowed the Village to make the most of its MFT funds while meeting critical infrastructure needs. By utilizing full-depth pavement reclamation with cement in conjunction with conventional milling and resurfacing operations, the Village successfully addressed underlying subgrade deficiencies in critical areas while extending roadway rehabilitation across multiple streets throughout the community, within the established project budget. Trotter and Associates, Inc.'s comprehensive approach ensured efficient project delivery, regulatory compliance, and optimal utilization of available funding resources for this essential infrastructure investment.

The Glenbard Wastewater Authority has hired Trotter and Associates, Inc. to move forward from the design phase to resident engineering services for the primary clarifier rehabilitation project. As part of these upgrades, the primary clarifiers, gravity thickeners, solids pumping system, and electrical and control systems will be replaced and upgraded due to aging infrastructure. The Authority has completed a 47 MGD bypass with six suction lift pumps and three overland force mains. This bypass allowed the primary clarifiers to be taken offline, enabling the installation of diversion structure gates that includes three new downward-opening weir gates and two new sluice gates. Over the following months, each clarifier will be taken out of service independently for complete removal and replacement with new stainless-steel mechanisms. The project team included Vissering Construction, Connelly Electric Co., Dahme Mechanical Industries, and Tri-R Systems, Inc. To learn more, follow TAI’s Current Projects at trotter-inc.com , or contact one of our team members.

The Village of Fox Lake and Trotter and Associates, Inc. have recently completed infrastructure improvements along Hillside Court, creating a safer and more dependable corridor for the community. The project involved building a soldier pile wall to replace a failing wall supporting the existing roadway, improving stormwater flow with rip-rap channels and drainage structures, and reconstructing the roadway using full-depth reclamation with concrete. This approach combined technical excellence with cost savings to provide long-term benefits for the community.
