Corporate Office
40W201 Wasco Road, Suite D
St. Charles, IL 60175
Phone: 630.587.0470
Fax: 630.587.0475
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
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.
To facilitate IDOT’s proposed widening of Illinois Route 53 at Butterfield Road, Illinois American Water was required to relocate several of its facilities within IDOT’s right-of-way. Illinois American Water retained Trotter and associates to design the relocation of a quarter mile of sanitary sewer, over a mile of water main, and a water pressure reducing station. These utility relocations are expected to begin within the next several months.
The City of Sycamore and Trotter and Associates are continuing to improve the rehabilitation of the City’s water distribution system. This project in conjunction with those previously completed and planned will improve City-wide fire flows, pressures and water quality. The 2025 Water Main Improvements project includes upsizing the system in this area from 4-inch, 6-inch and 8-inch water main to 8-inch and 10-inch, as well as replacing mains that are prone to breaks. In conjunction with the main replacements all lead water services encountered will be replaced to the customer’s water meter.
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.