The Minnesota Pollution Control Agency has developed guidance outlining a risk-based approach to decision making during site investigation and remedy selection under the state's Superfund and Brownfields Programs. The Risk-Based Site Evaluation (RBSE) Manual provides a tiered process for making decisions based on an evaluation of risks to human health and the environment. MPCA staff with expertise in risk assessment, soil physics, hydrogeology, and remediation technologies have developed the following risk guidance.
The RBSE manual includes individual documents describing the process of site characterization, community involvement, evaluating the risk to human health and the environment posed at a site, and how to address that risk. Working drafts of the manual documents are maintained here.
These forms are new as of January 2016, and are applicable to all Remediation Division programs.
October 2016: Draft SRV related documents
- Soil Reference Value (SRV) Technical Support Document (c-r1-05)
- SRV Spreadsheet (c-r1-06)
- SRV Spreadsheet — Site Specific (c-r1-07)
- Background Threshold Value (BTV) Evaluation (c-r1-08)
- Property Use Guidance (c-rem3-08)
- Soil Investigation Guidance (c-r1-14)
- Range of Risks Spreadsheet (c-r1-15)
The MPCA’s VIC, RCRA and Superfund programs are seeking stakeholder input regarding the October 2016 draft SRV related documents listed above. Please submit your comments to SRVcomments.email@example.com by December 2, 2016.
Note: Some of the SRVs did change due to a change in the definition of a VOC based on EPA’s recommendation. This revision was completed to ensure we were both consistent with EPA and with our intrusion screening values (ISVs) used to investigate vapor intrusion sites. Background threshold values (BTVs) for arsenic and BaP have not changed. All changes are shown on the “Comparisons” tab in the SRV Spreadsheet.
The MPCA will be hosting a stakeholder meeting on October 31, 2016. Details regarding this meeting will be announced later in October.
Timeline for SRV revisions
June 2015 SRV stakeholder meeting presentations
- Soil Reference Value Revisions (c-r1-17)
- Soil Reference Values: SRV Program Specific Guidance Revisions
September 2015 community stakeholder information session
- Soil reference values — Cleaning up contaminated sites
- Comparison of SRVs
- SRV Introduction Poster
- Soil Reference Value (SRV) Poster
- Background Threshold Value (BTV) Poster
- Soil Investigation Poster
October 2016 SRV related document stakeholder meeting presentations
The Minnesota Department of Health’s (MDH) “Guidance for Evaluating the Cancer Potency of Polycyclic Aromatic Hydrocarbon (PAH) Mixtures in Environmental Samples” is available at the link below.
- Guidance for Evaluating the Cancer Potency of Polycyclic Aromatic Hydrocarbon (PAH) Mixtures in Environmental Samples
This guidance recommends a revised method to evaluate carcinogenic PAHs (cPAHs) using relative potency factors (RPF) instead of potency equivalence factors (PEF) and an alternative surrogate mixture method using 7X the concentration of benzo[a]pyrene (BaP). Six new cPAHs have been added to the list to analyze and ten have been removed.
MPCA Interim Policy
Although it is MPCA's practice to adopt MDH's guidance, since laboratory analytical methods are not available to analyze the six additional cPAH compounds added to the RPF list, it is not feasible at this time. MPCA and MDH are working together to develop analytical methods for the new cPAH compounds. Once analytical methods have been established MPCA will re-evaluate the feasibility of implementing this guidance. Until then, MPCA will continue to use the PEF method to evaluate human health risks from cPAHs.
Current RBSE manual documents
- Air Impacts Evaluation
- Community Involvement in Risk-Based Decision Making
- Groundwater Guidance
- Natural Attenuation of Chlorinated Solvents in Groundwater
- Remedy Selection
- Sediments - Human Health and Ecological Evaluation
- Risk-Based Site Characterization and Sampling Guidance
- Guidance on Incorporation of Planned Property Use into Site Decisions
- Risk-Based Guidance for the Soil-Human Health Pathway User's Guide
- Surface Water Pathway Evaluation
- Best Management Practices for the Off-Site Reuse of Excess Fill from Development Sites (c-rem1-01)
- Draft guidelines - Risk-based guidance for the soil-human health pathway user’s guide - Executive summary
- User's guide (August 1998, 24 pages)
- Draft guidelines - Risk-based guidance for the soil-human health pathway, Volume 2, Technical Support Document (January 1999, 287 pages)
- Tier 1 SRV Spreadsheet (6/2009 - updated for PFBA, PFOA and PFOS only)
- Tier 2 SRV Spreadsheet (6/2009 - updated for PFBA, PFOA and PFOS only)
- SRV changes memo (12/2008)
- Working draft: Surface Water Pathway Evaluation User's Guide (c-s4-01)
- Appendices (file size = 2.6 MB) (c-s4-01a)
- Surface Water Toxics Impact Assessment Request form (c-rem4-44)
- Table 8: Tier 1 Surface Water Screening Numbers for all Non-ORVW or OIRW Waters (c-s4-01b)
- Table 9: Tier 2 Surface Water Standards and Criteria for Classes 1B, 2A, 3A or 3B, 3C, 4A, 4B, and 5 Waters (c-s4-01c)
- Table 10: Tier 2 Surface Water Standards and Criteria for Classes 1B or 1C, 2Bd, 3A or 3B, 3C, 4A, and 5 Waters )c-s4-01d)
- Table 11: Tier 2 Surface Water Standards and Criteria for Classes 2B or 2C, or 2D, 3A or 3B or 3C or 3D, 4A or 4B or 4C, and 5 Waters (c-s4-01e)
- Table 12: Tier 2 Surface Water Standards and Criteria for Classes 7, 3C, 4A, 4B, and 5 Waters (c-s4-01f)
- DRAFT - Ground water policy document (1998)
- Executive Summary
- Please access current drinking water criteria on MDH and EPA’s websites.
- Guidelines for natural attenuation of chlorinated solvents in ground water (May 2000, Revised June 2006) (c-s4-05)