Specifications include, but are not limited to: This specification and all related Contract Documents cover the requirements for the complete inspection of the Authority’s compressed natural gas storage tanks on transit buses. The Authority currently operates approximately 425 CNG (Compressed Natural Gas) buses with seven (7) to eight (8) storage tanks per bus. Each bus will require inspection and tank certification services every three (3) years and when a Qualifying Event, as defined in Note 3 of Form 3, Quotation Form, incorporated herein, occur requiring re-inspection and certification of the CNG tanks. A Qualifying Event include collision, vehicle fire, exposure to excessive heat, or any alleged damage that has occurred to the CNG tank.