Louisiana

3. Exposure estimation.

4. Risk calculation (using the HQ method to calculate a Hazard Index (HI)).

If the HI (sum of the hazard quotient for all COCs) exceeds 1, an ecological

risk assessment (ERA) must then be conducted.

The Georgia Environmental Protection Division (EPD) suggests that the

assessor at the facility consult with them to determine appropriate assessment and

measurement end points. An HQ or an HI is calculated in the ERA using site-

specific data, and proposed remedial levels are developed for each COC in each

medium for each receptor whose HQ exceeds 1. As in the development of

remediation levels which are protective of human health, remediation levels are

backcalculated and must be justified in the risk assessment report.

The remediation levels which are protective of human receptors and those

which are protective of ecological receptors are compared and the lesser of the

two values is selected as the final remediation level. Final remediation levels must

be protective of human and ecological receptors, as well as protective of

groundwater quality. Further, remediation must achieve protective levels for

current and "reasonable anticipated future" uses of the facility. The Georgia

Environmental Protection Division must approve all risk-based remediation

levels.

Also in Georgia, the Department of Environmental Quality has started a risk-

based program in their Hazardous Waste Division for determining risk to human

health. No guidance document exists at this time, but a document that models

Agency for Toxic Substances and Disease Registry (ATSDR) guidelines may be

written in the future.

Louisiana

The Louisiana Department of Environmental Quality (DEQ) currently is

working on a document entitled Proposed Approach for Implementing a Louisiana

Department of Environmental Quality Risk-Based Corrective Action (RBCA)

Program. The period for public comments on the document has just ended (June

1997) and the document will now be revised. This RBCA program is intended to

be used by all of the DEQs programs, including the Hazardous Waste Division,

Solid Waste Engineering Division, and Water Quality Management Division.

Maine

Document:

"Guidance manual for human health risk assessments at

hazardous substances sites. State of Maine Department of

Environmental Protection and the Department of Human Services

(ME DEP 1994).

This document was developed by the State of Maine Department of

Environmental Protection and the Department of Human Services in June 1994.

Its purpose is to provide consistent and "scientifically sound" procedures for

conducting human health risk assessments. It provides guidance for conducting a

A19

Appendix A Summary of Federal, State, and Regional Guidance