The development of a closed model system for the laboratory assessment of the efficacy and environmental impact of a chromated fluoride remedial treatment for creosoted distribution poles has been described (IRG/WP/2395-92). The model consists of a precipitation apparatus above a treated pole section positioned in a soil profile from which leachate was collected via a series of simulated field drains. Chemical analyses of leachate and soil provided data indicating movement of toxic preservative constituents from the treated pole section to the model environment. These data were complemented by physical and chemical analysis of a sward of perennial ryegrass supported by the soil profile. This paper reports initial results and observations in terms of the models' suitability for assessment purposes. The advantages of the model system over traditional field studies are discussed.

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