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Engineer presents MS4 annual report to Riverwoods board; EPA permit renewal still pending
2871824 · April 4, 2025
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Summary
Gaywalt Hamilton consultant presented the Village’s municipal separate storm sewer system (MS4) annual report, described inspection indicators and noted the Illinois EPA MS4 permit renewal has been delayed beyond the expected 2024 renewal date.
Carolyn Michal of Gaywalt, Hamilton and Associates presented the MS4 (municipal separate storm sewer system) annual report and described inspection focus areas, typical dry‑weather inspection protocol, and photographic documentation used during field work.
Michal explained that inspections look for oil sheens, soap suds,…
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