| Abstrakt: |
Sediment cores from two lakes at the U.S. Army Rocky Mountain Arsenal, Colorado, where chemical compounds were manufactured and stored for over 40 years, were examined to determine the distribution of aldrin, dieldrin, and mercury in sediments and their probable dates of deposition. Sedimentation rates, based on direct and indirect (Cs) measures, were estimated to be 1.91 and 1.23 cm/yr in the two lakes. Contaminant deposition dates, as judged by these sedimentation rates, varied between and within lakes; levels of contaminants were relatively high before 1970. The presence of elevated concentrations of all three contaminants in more recent sediments in one lake (Ladora) suggested migration within the sediments or delayed discharges from the manufacturing facility. [ABSTRACT FROM AUTHOR] |
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