Oil-borne PCP and arsenic from the preserving operation soaked into the soil around the tanks, the recycling pond, and the treated-wood yard. A land-use covenant recorded in 2013 (Sonoma County) now bars homes, schools, day-care, and water wells over this Restricted Soil Area, and bars digging into it; residual PCP remains below about 5 ft. The sawmill ground east of the tracks is outside that restricted area.
Callouts are my read of the 1965 photo, placed by eye — positions approximate, the pond especially.
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