Why is the Council concerned about lead concentrations in the soil?
Soil lead concentrations in much of the District are markedly elevated above the national average, and in places reach concentrations that may pose a risk to human health or the wider environment. The Government believes that the risks posed by naturally occurring contaminants should be considered alongside the risks posed by contaminants arising as a result of mans activities. It is considered that, on health protection grounds, there is no justification for excluding naturally occurring contaminants when investigating land contamination. It is known that certain forms of lead, such as lead phosphates (pyromorphite) are some of the most stable forms of lead found in soil (Hettiarachchi & Pierzynski, 2004). It is considered likely that it is these forms of lead that are present in the District as a result of natural weathering of lead minerals, in the presence of sufficient phosphorus in the soil (Cotter-Howells & Thornton, 1991). This could potentially result in soil borne lead within
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