Mobile home parks and retirement communities
The 1960s parks and senior communities are where Hemet's oldest manufactured homes are found. In these units, a floor replacement, a furnace swap or a re-roof can each disturb material that should be sampled first, and a park that removes several homes at once may be treated as a single regulated project. Because Rule 1403 covers residential structures without a carve-out for mobile homes, the survey and notification thresholds apply here just as they do to a site-built house. Park management may add its own rules on work hours, access and where waste containers can sit.
1980s single-family subdivisions
The 1980s subdivisions built on former ranchland are newer than the parks but still predate 1990, which is where most Hemet homes fall. Cal/OSHA's presumption for thermal system insulation stops at buildings from 1980, so these houses need actual sampling instead of assumptions in either direction. A 1985 kitchen floor may be clean; an earlier layer underneath may not. Remodels in these neighborhoods are often the first major work since the house was built, which is exactly when original materials get disturbed.