Lecture 2- January 6th

Lecture 2- January 6th - Environmental Resources and...

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Environmental Resources and Society II January 6 th , 2012 Why science-based? Example of where science based method did not work really well o The Sydney Tar Ponds Sydney Tar Ponds in Sydney, Nova Scotia Disappearing quickly – being cleaned up 400 million dollar solution was the most contaminated site in Canada Hamilton now has the most contaminated site in Canada- Hamilton Harbour (Randle Reef) Tar ponds are deposits of coal and iron ore due to coal mining and steel production o Coal tar= byproduct of making steel Coke ovens: coal was being baked at high temperatures to produce higher quality fuel source- these sites are contaminated Area labeled as “tar ponds” was created by deposit of chemical byproducts form coking process, runoff of water for cooling in coke ovens and steel mill and discharge of sewage from residential and commercial areas in late 80s: lobster that was caught from these areas were found to have high amounts of polycyclic aromatic hydrocarbons (PAH) and high in heavy metals such as lead and arsenic o PAHs: largest group of cancer causing chemicals in world o Discovery of PAHs in those waters led to closure of lobster fishery in harbor Cleanup cost of such sites varied from 30 million -> 40 million-> 400 million! This estuary that was later known as the tar pond was divided by a causeway or bridge divide into the North and South tar pond o Two ponds contained sediments contaminated with PAH and PCBs (polychlorinated biphenyls) Coal tar deposits in the estuary- want to clean it up o What are they going to do with it? Can dig it up and move it somewhere (ie. landfill)
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Lecture 2- January 6th - Environmental Resources and...

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