SOIL AND GROUNDWATER RISK ANALYSIS USING ANANALYTICAL TRANSPORT MODEL

摘要

The risks to soil and groundwater were evaluated at 136 contaminated sites with varying surface geology. The majority ofrnsites were located in North America (123), with the remaining sites in Europe (7), China (3), South Africa (2), and Australia (1). Riskrnfactors for surface soil were derived using an analytical model for eight categories of contaminants (DNAPLs, LNAPLs, PNAs, PCBs,rnlead, mercury, hexavalent chromium, chlordane) interacting with varied soil types. Ratios of previously computed groundwater riskrnfactors to the soil risk factors were calculated to measure a contaminant category’s likelihood of contaminating groundwater. The resultsrnindicate: (1) DNAPL compounds, mercury, hexavalent chromium, PCBs, and chlordane have the highest risk factors for soil, especiallyrnin clay soils, and (2) DNAPL compounds and hexavalent chromium have the highest risk factors for groundwater, especially in sandyrnsoils. Comparison of these results with another model application in southeastern Michigan, USA indicates there is a strongrncorrespondence between the ratio magnitudes and the occurrences of groundwater contamination at all the sites investigated.