National Pollutant Release Inventory (NPRI) Emission Estimate Guide for Primary Aluminum Producers
- 1. Description of the Industry
- 2. Are you required to report to the NPRI?
- 3. Overview of this Guide
- 4. Description of Operations (Raw Materials, Products, Releases vs. Reporting Criteria)
- 5. Identification of sources of releases and off-site transfers
- 6. Estimating Air Emissions: Part 1
- 7. Estimating Air Emissions: Part 2
- 8. Estimating Releases to Water Bodies
- 9. Estimating Releases to Land
- 10. Estimating Off-site Transfers (Disposal and Recycling)
- 11. Glossary
- 12. References
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.
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.
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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