Commission discusses requiring geotechnical reports for most multi-unit projects, with exemptions for single-family homes

Planning staff proposed a change to zoning clearance procedures that would require a geotechnical soil analysis report before issuing zoning clearance for most developments in residential zones, sparking a discussion about narrowly crafting exemptions.

"We're going to now require geotechnical soil analysis for any dwelling above a single family home," the staff member said, adding that the requirement would normally exclude single-family residences.

Commissioners discussed how to write the exemption language so the rule would not be circumvented later if an accessory structure was converted into an additional dwelling. One commissioner asked whether the exemption should be limited to accessory structures under a specific size (200 square feet was discussed) or left to the zoning administrator's discretion. The staff member suggested wording that requires geotechnical analysis for all zoning clearances unless exempted by the zoning administrator for a single-family dwelling or accessory structure.

Commissioners emphasized the rule should apply to multiunit buildings, duplexes, and subdivisions where cumulative soil impacts are greater, and that forcing a geotechnical study for every single-family house could be an undue burden. The commission asked staff to draft precise language clarifying the exemption criteria and whether it should reference square footage thresholds or administrative discretion.

Next steps: staff will prepare proposed ordinance/form language that specifies the geotechnical requirement and the precise exemptions for commissioner review at a future meeting.