It’s something infrastructure related - probably water. From old castle infrastructure’s web site
“The Oldcastle FRP family of enclosures are produced in a unique hybrid process bonding strong, polymer concrete rings with high-impact resistant fiberglass sidewalls, forming a monolithic body. Paired with polymer concrete lid, select units are suitable for light or heavy incidental traffic. Specifiers can meet expected load ratings while installers can handle and modify with ease.“
Oldcastle FRP | Oldcastle Infrastructure