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City staff brief council on Lake Point site history and asphalt‑plant monitoring; council asks for more air monitoring and public outreach
Summary
City staff briefed council on historical contamination and monitoring at the Lake Point site and on recent testing and compliance work at the nearby Heidelberg Materials asphalt plant; staff outlined options for expanded air monitoring and said additional on‑site testing would require landowner agreement.
City staff provided a detailed briefing on environmental monitoring related to the Lake Point property and the nearby Heidelberg Materials (formerly Cadman) asphalt plant and presented options for additional air and site monitoring.
Staff provided historical context for Lake Point: before substantial development the area was a wetland/floodplain modified by early 20th century drainage and by the Lake Washington Ship Canal (which changed lake levels). The site was used as a county‑permitted landfill from 1969 to 1976; Ecology records and consultant reports indicate fill depths of up to 15–20 feet in places and a variety of tests and remediation steps in later decades. A consent decree and remediation actions in the 1990s and early 2000s resulted in a cap requirement and periodic monitoring under Department of…
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