The pink formations on Black Walnut trees are actually galls. These particular galls are Petiole Galls. These particular galls are caused by a type of mite - Eriophyid mite (there are many different types of these mites and others are responsible for galls in other plant species including Rose Rosette disease in roses).
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The Center for Sustainable Communities has undertaken a multi-year project to evaluate stormwater control structures along the heavily traveled I-95 Corridor. Supported by a $1.8 million grant from the Pennsylvania Department of Transportation, the two-year study will examine stormwater management best practices with the intent of helping to improve water quality in the municipalities along the corridor.