What injection uses holes this large?

Jzack605

Well-Known Member
Location
Long island
I was making a PGR application today to a Hickory when I came across what I assume is injection sites. I’ve never seen some this large and can’t imagine why they would be at maybe 1/2”. Any one have any info? They were about every 6-10” if I had to guess off of memory.
 

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