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DIAGNOSIS OF TRACE PB IN DOMESTIC WELLS, UPPER GLOUCESTER CATCHMENT, MAINE
Citation:
SIDLE, W. C. DIAGNOSIS OF TRACE PB IN DOMESTIC WELLS, UPPER GLOUCESTER CATCHMENT, MAINE. DOI 10.1007/s00254-0, P. E. LaMoreaux (ed.), ENVIRONMENTAL GEOLOGY. Springer, New York, NY, V.52:51-62, (2007).
Description:
Dissolved Pb in 32 wells associated with corroding submersible pumps is examined within a rural water district after almost 20 years (1984 to 2002). Groundwater Pb ranged from 0.4 – 24.9 µg L-1 after 24 hr pump flushing. Preliminary geochemistry and representative borehole lithology examinations were extrapolated by Markov chain modeling. The first-order geostatistical realizations of glacial sediments coupled with the Monte Carlo Metropolis-Hasting method suggest that elevated trace Pb persists in sand and gravel units, and continues at least to 40m depth in the catchment. The 207Pb/206Pb and 208Pb/206Pb isotope compositions of groundwater Pb were decisive in discriminating the importance of leached Pb from submersible pump materials among geogenic sources.