Document Type

Report

Publication Date

January 1993

Abstract

Groundwater contamination potential is directly related to the location of zones of high hydraulic conductivity. Sedimentary depositional environments can be quite complex. Pockets of sand of varying thickness and orientation may be scattered over the aquifer. A contaminant pathway can esist where these pockets or lenses are interconnected. Aquifer pump tests do not provide useful information on the occurrence of such lenses. Drill log data directly sample the soil, but may represent very local sections of the aquifer, and are of relatively poor quality. Here we present a methodology (DLOG3D) that allows a probabilistic interpretation of drill log data that accounts for these uncertainties. DLOG3D output can be used to assess the likelihood that a zone of high conductivity exists in a location, and/or to map such zones in the vertical and the horizontal.