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National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers

8. Estimating releases to water bodies – Under development

This section presents the appropriate tools for estimating releases to water bodies.

8.1 Release of final effluent in runoff, process and cooling water, or combined final effluent

8.1.1 Process description

All points at which there is a release of effluent in runoff, process water, cooling water or a combination of these outside the grounds of the facility, i.e. all points of release to the environment (rivers and lakes), including points of release to a ditch or municipal sewer system.

8.1.2 Releases

Polycyclic aromatic hydrocarbon (PAHs), metals

8.1.3 Release calculations

The spreadsheet provides a list of parameters typically measured in liquid effluents. If the information or measurement is not available, for example, users can use one of the approaches mentioned in the Emission CodesTable.

8.2 Accidental spills and leaks

8.2.1 Process description

Any accidental release that may have occurred in the facility. The difference between a leak and a spill has to do with the duration of the event: a spill extends over a period ranging from a few minutes to a few days, whereas a leak lasts a few days to a few months.

8.2.2 Releases

All substances used on the site that can be released accidentally or substances that may leak.

8.2.3 Release calculations

The spreadsheet does not contain a standard procedure for estimating accidental spills and leaks into water bodies; users can therefore use one of the approaches mentioned in the Emission Codes Table.

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