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Fault‑zone trenching: Procter Terrace shows possible faulting; Hidden Valley shows no fault evidence in school redevelopment study
Summary
Geologic trenching for Procter Terrace and Hidden Valley elementary schools found no surface fault at Hidden Valley and evidence of possible fault‑related disturbance at Procter Terrace, producing a recommended no‑build zone for new habitable construction at part of the Procter Terrace site.
Santa Rosa City Schools released results of geologic trenching and seismic surveys Sept. 24 for Procter Terrace and Hidden Valley elementary campuses after the 2024 update of the Alquist‑Priolo Earthquake Fault Zone.
Findings - Hidden Valley Elementary: Geologists with Miller Pacific Engineering said trenching and geophysical surveys found no evidence of a surface fault crossing the site. The team dug through sediments older than 11,000 years, meeting state criteria for “no evidence of fault” on the tested area. Because the state regulatory zone extends beyond the site, a narrow 50‑foot strip was identified for further study before it could…
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