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Obstruction - The placement of an improvement in such a manner that it interferes with the normal use of a property. A tree planted in front of a gate would be considered an obstruction.
Occupancy - The occupants of a property, such as owner-occupied, tenant, vacant, etc.
Odors - Any foul or unusual odors that can be detected.
Oil-fuel tanks - Any tanks, both subterranean or above-grade, used for the storage of any oil or fuel.
Oil-gas wells - Any historical or currently operating wells on the subject property that were utilized for oil or gas production.
Oil seepage - The leakage of oil, possibly from natural underground deposits or from leaking containers or plumbing.
Oil spill - The accidental release of oil, often crude oil, into the environment.
Ongoing stage - The third stage in a detrimental condition analysis. It includes all costs associated with a damaged property after all repairs or remediation have been completede.g., additional financing or insurance costs, use, and market resistance.
Operations and maintenance (O&M) - An ongoing maintenance program for contaminated properties. For example, for asbestos it could include training, HEPA vacuuming, wet cleaning, and air monitoring. This is also termed end removal, as the contaminants remain until the eventual demolition of the building.
Options - The right to purchase or lease a property.
OSHA - Occupational Safety and Health Administration, a division of the U.S. Department of Labor. Also, Occupational Safety and Health Act Inspections. Database of serious, repeat or willful violations.
Owner of title - The property owner, according to the title documents or deeds.
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