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Board weighs pervious materials, shell use and enforceability in draft surface‑materials guidance
Summary
Staff and board members debated draft rules on pervious materials: whether to specify shell grade/containment to prevent migration, require city engineering standards or accept manufacturer specs, define 'low‑use maneuvering' areas, and how to enforce maintenance obligations like vacuuming; staff described sedimentation and footprint concerns and said standards need clarification.
Staff and board members spent an extended portion of the meeting on draft language that would govern pervious versus impervious surface materials, including crushed shell and porous pavement.
Engineering staff raised concerns about shell products "bleeding" fines as they settle and the risk that material could migrate into rights‑of‑way or roadways. “Shell likes to bleed as it settles over time with compaction... it could bleed back into the right away and into the roadway,” staff said, and asked whether the draft should specify shell grade, edging or containment to limit migration.
The board discussed whether the city should create formal engineering standards for pervious pavement or allow manufacturer specifications when city standards don’t exist. Staff also queried whether to permit pervious pavement in low‑use maneuvering areas, and if so how to define those areas and ensure structural integrity. Maintenance and enforcement were recurring concerns: board members noted some pervious surfaces require regular vacuuming and that city enforcement and tracking of private maintenance is difficult. The board asked staff to refine definitions (including a clear definition for "low‑use maneuvering") and to clarify where shell/aggregate materials are acceptable and how maintenance expectations would be enforced.
