Abstract: The present invention provides visual inspection and physical access into the space of a fluid containment system consisting of an inner storage container or vessel, and an outer, reinforced precast structure, or vault, having a top cover. Visual inspection ports and physical access assemblies, with easily removable covers, are cast into the vault top corners for direct, or remote viewing, such as with a periscope or video camera device, of the exterior surfaces of the inner storage container; the interior surfaces of the outer, vaulted structure; and the space between the two structures. Sufficient physical access and physical maneuverability is provided by the visual inspection port assemblies, and corresponding visual inspection chambers directly below each port assembly, that proactive inspection to verify primary vessel integrity and removal of fluids from the interior space between the two containers can be achieved without personnel entry or removal of the vault top.

Abstract: A data communication system is provided for use with a cellular system containing an array of cells and a cellular transmitter/receiver located within each cell of the array. Each cellular transmitter/receiver is adapted for transmitting and receiving voice and/or data communication over predetermined channelized frequencies associated with the particular cell in which the cellular transmitter/receiver is located. In accordance with the invention a base data transmission station is located in each cell and is adapted for transmitting a single data stream across a plurality of channels, each of which channels is adapted to carry a single stream of information. Each base data transmitting station does not transmit on the predetermined channels that are assigned to the particular cell in which the base data transmitting station is located (i.e., those channels are "notched").