October 16, 2026

The survey and notification steps that come before any Bay Area demolition permit: who is certified to do the survey, how BAAQMD notification and the J-number work, and the two different thresholds BAAQMD and federal NESHAP use.

Two different Cal/OSHA thresholds — 4 feet for egress, 5 feet for protective systems and a permit — explained with the soil classification rules and slope math that decide what a compliant trench actually looks like.