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Sanitary sewer, drainage and emergency access dominate Hawk Ridge technical questions
Summary
At the Hawk Ridge hearing residents and engineers debated gravity sewer routing, depth, potential impacts to mature trees and drainage design; engineers said a gravity tie was feasible via directional drilling and that the detention design will reduce peak flows but acknowledged some details are finalized at the final engineering stage.
Residents asked detailed engineering questions about the proposed sanitary sewer route, construction impacts, and long‑term maintenance. Multiple speakers said earlier engineering reviews flagged deep sanitary trenches and narrow easement widths that could make future maintenance difficult.
Project civil engineer Mike May said the team researched options and identified a directional‑drill gravity route in a 15‑foot easement that will typically be 12–13 feet deep, not the 20‑plus feet some residents feared. "We would directionally drill that ... so there'd be no impact to the residents," he said, explaining that manholes and a receiving pit would be placed to minimize driveway disruption and that the cul‑de‑sac would remain accessible during construction.
On stormwater, the engineers said the on‑site detention and restrictor would attenuate peak flows and provide a net reduction in discharge rates compared with current conditions, while acknowledging that very large events could overtop local conveyance. Commissioners asked for final sewer elevations, IEPA permitting pathways and confirmation that the fire protection district can serve a single‑entrance configuration; staff and petitioner agreed to provide those materials before the continued hearing.
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