While it is widely accepted that lead-based paint and leaded gasoline areprimary sources of elevated concentrations of lead in residential soils,conclusions regarding their relative contributions are mixed and generallystudy specific. We develop a novel nonlinear regression for soil leadconcentrations over time. It is argued that this methodology provides usefulinsights into the partitioning of the average soil lead concentration by sourceand time over large residential areas. The methodology is used to investigatesoil lead concentrations from the 1987 Minnesota Lead Study and the 1990National Lead Survey. Potential litigation issues are discussed briefly.
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