Pathway Exclusions / Guideline Modifications

 

In Alberta, the Alberta Soil and Groundwater Remediation Guidelines allow exclusion of pathways if certain site requirements are met.  However, they are limited. Beyond that, Tier 2 modifications are accepted for basic petroleum hydrocarbons and polycyclic aromatic hydrocarbons via re-calculation of the guidelines; the approach allows for the consideration of site-specific conditions through the modification of Tier 1 guidelines and/or removal of exposure pathways that may not be applicable to the site. Chloride concentration guidelines can be modified through the use of the Subsoil Salinity Tool to accomodate site-specific guidelines.  Beyond that, a risk-based assessment is used.

 

In BC, the Contaminated Sites Regulation does not allow modifications to the standards but does allow pathway exclusions through prescriptive Technical Guidance Documents and Protocols of the Contaminated Sites Regulation.  Pathway exclusions do not change the contaminant concentrations. Rather, by eliminating a pathway(s), the risk to the applicable receptor is then eliminated.  Beyond that, risk-based approaches are allowed.

 

Pathway Exclusions / Guideline Modifications

 

In Alberta, the Alberta Soil and Groundwater Remediation Guidelines allow exclusion of pathways if certain site requirements are met.  However, they are limited. Beyond that, Tier 2 modifications are accepted for basic petroleum hydrocarbons and polycyclic aromatic hydrocarbons via re-calculation of the guidelines; the approach allows for the consideration of site-specific conditions through the modification of Tier 1 guidelines and/or removal of exposure pathways that may not be applicable to the site. Chloride concentration guidelines can be modified through the use of the Subsoil Salinity Tool to accomodate site-specific guidelines.  Beyond that, a risk-based assessment is used.

 

In BC, the Contaminated Sites Regulation does not allow modifications to the standards but does allow pathway exclusions through prescriptive Technical Guidance Documents and Protocols of the Contaminated Sites Regulation.  Pathway exclusions do not change the contaminant concentrations. Rather, by eliminating a pathway(s), the risk to the applicable receptor is then eliminated.  Beyond that, risk-based approaches are allowed.

 

Pathway Exclusions / Guideline Modifications

 

In Alberta, the Alberta Soil and Groundwater Remediation Guidelines allow exclusion of pathways if certain site requirements are met.  However, they are limited. Beyond that, Tier 2 modifications are accepted for basic petroleum hydrocarbons and polycyclic aromatic hydrocarbons via re-calculation of the guidelines; the approach allows for the consideration of site-specific conditions through the modification of Tier 1 guidelines and/or removal of exposure pathways that may not be applicable to the site. Chloride concentration guidelines can be modified through the use of the Subsoil Salinity Tool to accomodate site-specific guidelines.  Beyond that, a risk-based assessment is used.

 

In BC, the Contaminated Sites Regulation does not allow modifications to the standards but does allow pathway exclusions through prescriptive Technical Guidance Documents and Protocols of the Contaminated Sites Regulation.  Pathway exclusions do not change the contaminant concentrations. Rather, by eliminating a pathway(s), the risk to the applicable receptor is then eliminated.  Beyond that, risk-based approaches are allowed.

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