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Commission declines variances for steep‑slope Arbor View lot after contested geotechnical debate
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Summary
The commission declined to grant variances that would have allowed construction of a single‑family lot and driveway on slopes greater than 15% and to exceed watershed impervious limits (requesting 3,900 sq ft). Staff and watershed experts warned of environmental risks; applicant engineers argued piers, detention and limited disturbance would mitigate impacts, but the final motions to approve failed to garner the votes required.
Commissioners reviewed a subdivision variance request for Arbor View (CA20250085/Arbor View Subdivision) that sought three variances: driveways and building construction on slopes over 15% (LDC 25‑8‑301 and 25‑8‑302) and permission to exceed watershed impervious cover limits (LDC 25‑8‑4‑23) to allow about 3,900 square feet of impervious cover on what staff described as a predominantly >25% slope site.
City staff and Watershed Protection staff recommended denial, describing the site as steep (many slopes >25%) in the Bull Creek water‑supply suburban watershed and noting the applicant’s geotechnical memo lacked borings and laboratory data necessary to confirm bedrock competence. Watershed hydrogeologist Eric Brown said the report relied on shallow test pits (typically <4 feet) and lacked core borings and lab strength data required for confident lateral‑load and slope‑stability modeling; staff concluded there is a “significant probability of harmful environmental consequences” without more rigorous investigation and mitigation.
The applicant’s geotechnical and structural engineers countered that access constraints limited mechanized borings but that portable test pits had reached fractured limestone and that pier foundations, reduced bearing pressures and a detention plan would manage loads and runoff. Applicant representatives agreed to several conditions proposed by staff, including limiting impervious cover to the requested amount, detention design and maintenance, pier foundations rather than slab‑on‑grade, and performing slope‑stability analyses verified by the city.
Commissioners debated precedent, environmental risk and fairness to a property that had remained undeveloped while neighbors were built out decades earlier. A motion to deny the variances was offered and a later motion to approve with five staff conditions was seconded, but commissioners were split and ultimately the approval motion failed to reach the required support under the commission’s voting/quorum rules. With no successful motion to grant the variances, the request was not approved at this hearing; staff noted code allows the applicant to reapply after a one‑year period.
