I found BCP758 BBB Event.
It was a short drive to get over to this cap and I was glad that I pulled into an empty parking lot. I walked over to GZ and didn't spot anything in the sidewalk but the water valve cover, I checked the grass and didn't notice anything there. Instead of pulling the cover off and looking I decided to go back to the vehicle and read the hints. After reading that it was under the cover I walked over and took it off. That's a deeper hole than I was expecting to see but I could easily see the cap at the bottom of it. It was a pretty busy intersection this evening so I'm sure that I had quite a few odd looks. Thanks for another cool cap. TFTBC