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Risk-based Site Evaluation Process Guidance DocumentsCurrently Available: Risk-Based Site Evaluation Publications
The Minnesota Pollution Control Agency (MPCA) has developed guidance outlining a risk-based approach to decision making during site investigation and remedy selection under the state's Voluntary Investigation and Cleanup (VIC) and Superfund 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 members with expertise in risk assessment, soil physics, hydrogeology, and remediation technologies have developed this guidance and accompanying risk evaluation spreadsheets that comprise the RBSE Manual. The Risk-Based Site Evaluation Manual is composed of 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 documents are now available. Additional documents will be made available as they are completed. Note: The MPCA maintains a mailing list of all persons requesting draft documents so they can be notified of revisions and new documents. If you download electronic copies of the below documents, please send us your mailing address so we can keep you up to date; fax to 651-297-8676. Currently Available: Risk-Based Site Evaluation PublicationsFact SheetsShort, 1-3 page introductions to the Risk-Based Site Evaluation documents. Risk-Based Site Evaluation DocumentsRisk-Based Site Evaluation Manual - Introduction and Overview - A description of the Risk-Based Site Evaluation process, including a three-tier scheme for quantitative risk evaluation and analysis of selected pathways. Contact: Allen Dotson 651-757-2315
Contact: Allen Dotson 651-757-2315 RBSE Documentation Checklist - Indicates steps in site characterization, risk assessment, and remedy selection process that warrant documentation. Refers to guidance documents that relate to each step, and suggests reporting structure that may expedite MPCA staff review.Contact: Allen Dotson 651-757-2315 Site Characterization and Sampling Document - provides guidance on sampling and analysis requirements for site activities from investigation through closure. The document provides guidelines for the collection of data of sufficient quality and quantity to facilitate risk-based site evaluation, remedy selection, and remedy verification. Contact: Fred Campbell, 651-757-2260 Example Sampling Protocol (for Groundwater) Guidance on Incorporation of Planned Property Use into Site Decisions - The purpose of this guidance document is to summarize how planned property use may be incorporated into the investigation and cleanup decision-making process at Superfund and VIC Program sites as required by state Superfund law. Planned use of the property will be taken into consideration when setting cleanup standards and selecting response actions. Contact: Tom Schaub, 218-529-6251
Community Involvement in Risk Based Decision Making - outlines the MPCA's strategy for supporting positive relationships with citizens living and working near sites that are under evaluation for possible health and environmental impacts. Contact: Corrie Rude-Young, 651-757-2680 Risk-Based Guidance for the Soil - Human Health Pathway - is designed to assist users in properly applying risk-based guidance for evaluating the human health risk caused by exposure to contaminated soil. The information in this document supersedes the guidance pertaining to the soil-human health pathway contained in the below, "Site Screening and Evaluation Document." Contact: Emily Hansen, 651-757-2407
Site Screening and Evaluation Document - presents an overall process for conducting a screening, or Tier 1 evaluation of the various exposure pathways at a site. Contact: Emily Hansen, 651-757-2407 Risk Based Guidance for Evaluating the Soil Leaching Pathway - provides guidance on use and development of contaminant specific soil leaching values (SLVs) for evaluating the risk to Groundwater at sites from the soil-to-Groundwater leaching pathway. The basis for and application of Tier 1 SLVs are presented and a step-wise procedure is presented for using site specific information for developing Tier 2 SLVs for making site corrective action decisions based on this pathway. Contact: Rick Jolley, 651-757-2475 Risk-Based Guidance for the Vapor Intrusion Pathway—is designed to assist users in properly applying risk-based guidance for evaluating the potential risks to human health caused by exposure to volatile compounds in buildings and structures that are due to vapor intrusion at sites within the Superfund, RCRA and Voluntary Cleanup Section. The Technical Support Document referenced in this guidance is in preparation and will be available at a later time. Contact: Rick Jolley, 651-757-2475
Surface Water Pathway Evaluation User’s Guide—This document is a user’s guide to evaluation of risk to surface waters, as potential or actual receptors of Groundwater plume contamination or through surface water runoff. It is part of a larger effort to develop guidelines for evaluating potential impacts to human health and the environment at sites that may require investigation or response action. Contact: Barb Gnabasik, 218-529-6266
Groundwater Guidance Document - presents the framework through which the MPCA staff evaluate Groundwater contamination problems and manage decisions regarding remedial actions at sites. The guidance is based on managing risk associated with Groundwater contamination within the context of state and federal regulations. Contact: Dave Scheer, 651-757-2693 Natural Attenuation of Chlorinated Solvents in Groundwater - defines the steps required to demonstrate that natural attenuation is a satisfactory remedy for Groundwater contaminated with chlorinated compounds such as trichloroethylene and tetrachloroethylene. The document first provides a simple screening evaluation process that is intended to indicate whether natural attenuation of these contaminants is a promising remedy alternative. This screening evaluation is followed by steps required to verify that natural attenuation is serving as an effective remedy at a site. A work plan checklist and recommendations for natural attenuation sampling are also included. Contact: Mark Ferrey, 651-757-2355
Remedy Selection - Once it is determined through the risk-based decision making process that a remedy is needed to reduce risk at an individual site, the remedy selection process begins. The intent of this document is to provide the most appropriate approach to remedy selection based on site specific circumstances. Contact: Allen Dotson 651-757-2315 Document AvailabilityPrinted copies of the above documents may also be requested. A photocopy fee of approximately $0.20 per page will be charged for requests in excess of 20 pages. Please fax your request to 651-297-8676. Other Risk-based Site Evaluation Subject AreasFor the following subject areas, document development remains under consideration.
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Air Impacts Evaluation
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Covenant and Easement
Tier
1 SRV Spreadsheet
Calculation
Spreadsheet (Excel 5.0/95)