API PUBL 4659-1998

$36.40

Graphical Approach for Determining Site-Specific Dilution Attenuation (DAFs)

Published By	Publication Date	Number of Pages
API	1998	227

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Description

This document describes the technical basis for the Graphical Approach for Determining Site-Specific Dizution-Attenuation Factors. This is the result of a project focused on developing simplistic graphically-based approaches for deriving target soil cleanup goals for sites where groundwater is, or may be, affected by spills, leaks, or other accidental releases of liquid hydrocarbons.

This graphical approach is intended to complement methodologies used by USEPA for selecting dilution attenuation factors (DAFs). The DAF is a quantity relating leachate concentrations leaving hydrocarbon-contaminated soil zones and the resulting impact to down gradient groundwater quality. To date, many regulatory agencies have employed generic "one size fits all" DAFs that are usually conservative and disregard a site's specific characteristics. The graphical approach provides a simplistic, yet technically-defensible alternative for those desiring more site-specific values for vadose zone and submerged sources. This approach is consistent with risk-based corrective action (RBCA) approaches currently being implemented and evaluated by regulatory agencies.

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