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By: Addie Kelble and Lucinda Mortimer Addie's Sites Big Sewickley Creek is my first sampling site of the day and is located near Plum Street Park. To access this tributary, you walk down a path through some greenery and emerge onto a small rock beach. This site is a tributary of the Ohio River. The water always looks so clear and is quick and lively. I see a lot of wildlife at this location, which is exciting to observe. Each week I’ve gone, there has been a large committee o