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Geostatistics in Estimating Chemical Residuals at a Site

by R. L. Bras, MIT, United States,
E. G. Vomvoris, MIT, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Kriging with generalized covariances is used to evaluate the effectiveness of remediation and cleaning of a contaminated site. The goal is to estimate: a) the amount of total volatile organics at the site with a measure of the uncertainty of that number and b) the probability of finding localized large concentrations of volatile organics throughout the site. Data consisted of over fifty samples, collected from pits, and analyzed by gas chromatograph techniques as well as aggregated measures with portable vapor analyzers. Samples were generally available at two depths. Problems that required special attention were: 1) errors in measurements; 2) inconsistency and incompatibility between observations; 3) combining information at various depths; and 4) estimating mass from indirect vapor readings.

Subject Headings: Soil pollution | Water pollution | Groundwater pollution | Chemical wastes | Waste sites | Statistics | Site investigation

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