jeeze...
There just isn't anything native to PA that should look like that. Unless I am talking to someone who handles a lot of snakes I tend to disregard size information. A 4-foot snake easily becomes a 6-foot snake even when someone is comfortable with the animals.

The closest things I can think of would be some sort of blotched species such as a Black Ratsnake that has retained some of its juvenile color pattern or an Eastern Milksnake which should not be blue but the background can be dark gray on occasion.
Here is a pic of a Black Ratsnake with some of the juvenile pattern remaining. It's a bit of a stretch but it's the most likely match I think of:



I can certainly understand how someone might see blue in a black snake. It's tough to explain distinct bands on a snake even somewhat approaching 6 feet in length.

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