EPA On-line Tools for Site Assessment Calculation

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Overview

This page gives a brief overview of the site. Each of the small drawings on this page is linked to a larger figure showing more detail. The larger figures should be viewed and details noted as discussed in the text.

Although the purpose of this section is to introduce the case, review of the site assessment is an important part of the modeling review. The model conceptualization and many input parameter values come from the site assessment. If there are problems in understanding of the site, the application of models will be limited as it will reflect those limitations.

The information presented below describes the site and poses questions about the information. Think about your answers to these questions as you go through this material. My answers will follow on subsequent pages.

The site consists of a service station with three underground storage tanks. The site plan shows the locations of the tank pit (where the release occurred) the monitoring wells and other site details.

Measured ground water levels and contours show that the ground water flows roughly from the top to the bottom of the drawing. Note the locations of the wells, the measured water levels, and the contours.

Do you agree with the contouring?
Which way do you expect the contaminants to move?
Are the wells located so that the plume would be delineated?

The contaminant distribution was determined to consist of a zone of free product around the tank pit and a more extensive zone of dissolved contaminants. The contaminants appear to move to the southwest--in the direction of the ground water gradient. The extent of contaminantion is not determined as noted by the question marks.

How far do the contaminants extend from the tank pit?

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Contact Jim Weaver to ask a technical question on this material.