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Column Name: POTW_RELEASE_1


Description: The amount of a POTW transfer that is estimated to be a release to the environment. Some chemicals that are transferred to POTWs are not successfully treated, removed or destroyed. Instead they are, in whole or in part, released to the environment as slug or other waste.

In reporting years (RY) 2013 and prior, chemicals that appear in a POTW transfer and are identified as metals (see TRI_CHEM_INFO.METAL_IND) are calculated as being 100 percent released to the environment.

In reporting years 2014 and after, default percentages were established for each chemical (through experimentation and estimation) that indicate how much of a POTW transfer is released and how much is treated. These percentages, available in TRI_CHEM_INFO.DEFAULT_PERCENTAGE_TO_81C, TRI_CHEM_INFO.DEFAULT_PERCENTAGE_TO_81D and TRI_CHEM_INFO.DEFAULT_PERCENTAGE_TO_87, determine how much of a transfer is considered a release. The percentages that appear in DEFAULT_PECENTAGE_TO_81C ( (Total off-site disposal to Class I Underground Injection Wells, RCRA Subtitle C landfills, and other landfills) and DEFAULT_PERCENTAGE_TO_81D (Total other off-site disposal or other releases) are each multiplied by the transfer amount and then summed to calculate the total POTW_RELEASE.

Facilities can optionally override these percentages when reporting. In which case, the percentages that a facility reported in TRI_TRANSFER_QUANTITY.potw_percentage_to_81c and TRI_TRANSFER_QUANTITY.potw_percentage_to_81d would each be multiplied by the transfer amount and then added together to calculate the POTW_RELEASE. If the flag TRI_TRANSFER_QUANTITY.potw_percentage_provided equals "YES" then the facility did override the default percentages and provided their own. The facility provided values should then be used to calculate the POTW_RELEASE. If TRI_TRANSFER_QUANTITY.potw_percentage_provided equals "NO" then the default values should be used to calculate POTW_RELEASE.
Envirofacts Table Name(s):
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Properties:
  • Type:NUMBER
  • Length:21,7

Definition Source:TRI Data Dictionary