Mississippi Administrative Code › Title 11 - Mississippi Department of Environmental Quality › Part 3 - Hazardous Waste Management Regulations › Chapter 2 - Mississippi Commission on Environmental Quality Final Regulations Governing Brownfield Voluntary Cleanup and Redevelopment in Mississippi › Subchapter 2 - RISK EVALUATION PROCEDURES › Rule 11-3-2.2.1 - General

Current through June 25, 2024
A. Introduction
(1) The Mississippi Brownfields Voluntary
				  Cleanup and Redevelopment Program (Brownfields Program) utilizes risk-based
				  criteria for Site evaluation and remediation. The risk-based procedures and
				  rationale for evaluating environmental contamination on or under a Site are
				  presented in this Subchapter II. This evaluation is necessary to develop
				  remediation requirements that are protective of human health and the
				  environment. All remediation and/or corrective actions must be approved by
				  MDEQ.
(2) In considering the
				  risk-based evaluation of conditions on or under a Site, the following must be
				  addressed:
(a) complete the Site Conceptual
				  Exposure Model (SCEM) to evaluate site-specific risk and exposure conditions
				  before and after remediation;
(b)
				  conduct a Site Characterization to delineate the nature and extent (vertically
				  and horizontally) of contamination found on or under the Site;
(c) complete the Site Ecological Checklist to
				  determine whether an ecological risk assessment is necessary; and
(d) conduct a Risk-Based Evaluation of the
				  Site utilizing the Brownfields Program three-tiered approach.
(3) The cornerstone of the
				  Brownfields Program is a three-tiered risk-based process for evaluating human
				  health and environmental risks. These tiers are referred to as Tier 1, Tier 2,
				  and Tier 3. These tiers are designed to allow the Applicant to evaluate and
				  determine appropriate remedial options for site specific conditions. A
				  description of each tier is discussed below.
(a) A Tier 1 Evaluation is the comparison of
				  site-specific data to a "look-up" table of chemical-specific target remediation
				  goals (TRGs). Specific TRG concentrations have been determined to be protective
				  of human health and the environment for restricted use and unrestricted use of
				  a Site. The Tier 1 TRG Table is presented in Appendix A.
(b) A Tier 2 Evaluation provides the
				  Applicant the option of performing a more in-depth evaluation of site-specific
				  conditions to develop site-specific Remediation Goals (RG) and/or to better
				  define site-specific data to be used for a Tier 1 Evaluation.
(c) A Tier 3 Evaluation is a site-specific
				  risk assessment to evaluate the potential human health and ecological risks at
				  the Site that will result in the development of site-specific Remediation Goals
				  (RGs).
(4) Land use plays
				  an integral role in the three-tiered approach and in the development of the
				  SCEM. Land-use restrictions may reduce or eliminate the potential for exposure
				  to contaminants and risk.
(5)
				  Specific criteria for evaluating Sites impacted with petroleum hydrocarbons is
				  contained in Rule
				  2.2.7 of this
				  Subchapter.