They are pretty much everywhere, really hard to see as well, they blend in with the pea gravel. I have already had to repair 4 pin holes in just 2 sessions. I also stepped on one I think and It's been bothering me for about a week now. It feels like a glass sliver, and hard to find
I have a 24" wide magnet on wheels, usually used for cleaning up nails from jobsites. I dont have the time to head up to the spit to help sweep the launch area, but if it's really that bad, and someone wants to do the work, I'd be happy to lend it out.