Specifications include, but are not limited to: AC Transit is seeking bids to solicit services for troubleshooting and repair of two underground storage tanks (USTs) at the AC Transit Division 4 Facility. The Division 4 Facility is located at 1100 Seminary Avenue in Oakland, CA and has USTs containing diesel to fuel its buses. Each diesel UST is a 12,000 gallon double-walled fiberglass tank that was installed in 1986. A small amount of water was found within the annular space of two (Tank #4 and Tank #5) of the USTs, indicating a potential water intrusion issue. Subsequent pressure testing with helium was conducted to confirm potential issue(s) for water intrusion into each tank, and helium from the annular space testing was detected at the ground surface at the tank ends containing the risers.