In 2022, Trotter and Associates, Inc. completed an assessment of the Village of Algonquin’s Braewood Lift Station. The primary improvements focused on increasing the station’s capacity to handle the rapid growth in both the Braewood Lift Station service area and the upstream Grand Reserve Lift Station service area. With the increased capacity of the station, the velocity through the existing 10-inch force main exceeded allowable limits. To address this, a 16-inch force main was included in the design, which was constructed in 2024.  With the force main constructed, the station rehabilitation has commenced. Work within the station includes upsizing the piping and pumps, replacing the grinder, and improving both the electrical and HVAC systems. Upon completion of the work, the pumping capacity of the station will be increased from 1,500 gallons per minute (GPM) to 5,000 GPM, allowing the Village to meet both current and future development demands.

Trotter and Associates, Inc. recently completed a Wastewater Treatment Plant Consolidation Study for the Village of Addison. As a result of the study, the Village elected to fully consolidate their facilities in lieu of doing a partial consolidation or rehabilitating and upgrading their existing treatment facilities. For constructability and financing advantages, the consolidation was separated into three phases. The Trotter team has begun developing the improvements for the first phase, which includes upgrading and expanding the North Wastewater Treatment Plant. Upon completing all three phases, this facility will process all wastewater flows from within the Village. Phase one includes construction of a 44,500 square foot Garage/Laboratory/Operations Building, Screening Building, Advanced Treatment Building (low-P treatment basins, tertiary filters, and UV disinfection), and excess flow clarifiers. In addition to these new structures, the following existing processes will be improved: upgrades to the grit removal system, rehabilitation of the primary and final clarifiers, rehabilitation and expansion of the aerobic digestion process and digester gas storage, and expansion of the biological process, which includes conversion from a two-stage extended aeration process to a single-stage A2O process. Construction is planned to begin in 2026 and continue into 2030.

Illinois American Water engaged Trotter and Associates, Inc. to assist in relocating their water main due to the Illinois Department of Transportation’s (IDOT) widening of Route 31, north of Route 176. The relocation was routed adjacent to IAW’s existing wastewater treatment plant. ComEd, Nicor, and telecom utilities have either completed or are in the process of relocating their respective utilities. Stenstrom Companies Ltd completed the construction of the Illinois American Water main. The project is substantially complete, pending favorable weather conditions and the maturation of landscaping elements. 

The City of North Chicago's Foss Park Underpass and Retaining Wall Improvement Project is nearing completion. This section of Foss Park Avenue is a critical access point for AbbVie Pharmaceuticals, the FBI Training Facility, Foss Park District amenities, West Rock Corporation, and Naval Station Great Lakes, so time was of the essence. The contractor achieved substantial completion within seven weeks. This $550,000 project included reconstructing 800 feet of the roadway and all associated curbs, sidewalks, and storm sewer. The roadway section under the Chicago Northwestern Railroad underpass was improved from an HMA pavement section to a 10-inch PCC-reinforced pavement section. Areas along the route were also reprofiled to improve drainage. To replace a failing stone wall along a portion of the corridor, a 130-foot modular block retaining wall was installed. The remaining parkway restoration and HMA surface course placement is expected to be completed in Spring 2025.

Construction of Fox Metro Water Reclamation District’s North WWTP Bar Screen Replacement project has begun. Trotter and Associates is assisting the District with construction engineering services throughout the project, including close coordination and collaboration with the District's design engineer. The existing bar screen operation utilizes three mechanical bar screens, which date back to 1989 when the District operated as the Aurora Sanitary District. The three existing screens are being replaced as part of the project, and a fourth is being integrated into the process. The contractor recently completed the erection of the building's additional outer shell. To facilitate the building addition, the contractor relocated several site utilities, including the relocation of the 72” overflow. With the project still in its infancy, construction will continue through 2025.