I'r - Memorial University of Newfoundland

originate from the Maumee River at Toledo and the Raisin River at Monroe. In addition,
some diagenetic processes may contribute to the PAH assemblage in the southeastern part
ofthe basin.
Although the major po llution introduced by the Detroit River is distributed and
deposited within the Western Basin.lhe major flow laden with contaminated sediment
particles leaves the western part oflhe lake to enter the Central Basin (Fig. 53.1). 00
ex iting the Peele Passage. the flow splits into two parts. The northern branch
contam inates sediments ofthe central part ofthe lake. while lhe southern branch reaches
the Ohio shore and turns east to become a part ofa strong easterly directed drift following
along the shore.
At Cleveland. the flow bearing lhe residual pollution signal is joined by
contami nated outflow ofthe Cuyaho ga River (Fig. 5.3.1). The compounds introduced
here are predominantly ofcombustion origin with slight traces ofoil. The PAH
orig inating from both car emissions and fire places are further brought into the river with
direct city runoffand may partially emanate from storm sewers. The polluted particles
are further transported and deposited along the southern shore towards the Niagara River
outlet. This contamination can also be partly distributed towards the central part ofthe
lake by existing here compensatory bottom currents and temporary circulation patterns.
Further east, a strong pollution signal is introduced by the Buffalo River at Buffalo
(Fig. 5.3.1). The river flow contains only ccmbustt on-produced PAR originating from
both car emissions and fire places. the latter possibly predominant. This pollutants are
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