Montana Risk-Based Corrective Action Guidance for Petroleum Releases

This guidance describes Montana DEQ's Risk-Based Corrective Action (RBCA) evaluation process. It provides a description of the concepts and terms that must be understood to use RBCA for petroleum releases in Montana, and is not intended to address other chemical (non-petroleum) releases.

The May 2018 Tier 1 Risk-Based Screening Levels (RBSLs) tables are available for individual download below, followed by the entire May 2018 RBCA Guidance document.

May 2018 Tier 1 RBSLs Tables

Downloadable Documents
Table 1 - Tier 1 Surface Soil (0-2') RBSLs
Table 2 - Tier 1 Subsurface Soil (>2') RBSLs
Table 3 - Tier 1 Groundwater RBSLs and Standards
Table 4 - All Potential Tier 1 RBSLs for Soil
Table 5 - Conceptual Site Model


Downloadable Documents
RBCA Guidance Text
Appendix A - Vadose Zone Modeling Technical Support Document
Appendix B - Direct Contact Technical Support Document
Appendix C - Montana Method

 Polycyclic Aromatic Hydrocarbon (PAHs) Toxicity Equivalence Calculator

Downloadable Document
TEF Calculator