Common Types of Site Operations and History Information

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Site Operations and History Aspect	Examples	How Used in the PHA Process
Current and past hazardous waste treatment, storage, and disposal practices	Workers anecdotes about disposal of chemicals on site property	Waste manifest documents

Common Types of Site Operations and History Information
Site Operations and History Aspect	Examples	How Used in the PHA Process
Current and past activities conducted at the site	Process descriptions Associated wastes generated Open pits/holes	Indicate potential contaminants of concern at the site
Current and past hazardous waste treatment, storage, and disposal practices	Workers anecdotes about disposal of chemicals on site property Waste manifest documents	Provide information on the potential for releases of contaminants to the environment
Date of specific site operations	Period during which contaminant releases may have occurred	Help identify the extent of contamination and contaminant migration
Uses of the site (past, current, and planned future, if different)	Areas where the public or workers may be or could have been exposed to contaminants	Provide details about exposure potential
Significant events in the site’s history	Changes in site size/boundaries Changes in site ownership Development of the site• Fires, explosions, and other non-routine events	Indicated location, types, rates, and times of contaminant releases