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Sorry, forgot it was a local term:

CIMA is an acronym for Channel Industries Mutual Aid. It was created in 1955 as a mutual aid agreement between several industrial complexes and municipal government agencies to bring quick and adequate aid to an industrial plant in case of a major incident. CIMA is so named because of its many petrochemical plants on the banks of the Houston Ship Channel. The plants and agencies are divided up into four zones depending on geographical location. Possibly, response to a plant will come from other plants in its zone.

There are two main dispatch centers set up for operation during an actual emergency. One is located at the Baytown Fire Dispatch and the other at Pasadena Fire Dispatch. Center Street (and it's imaginary extended line) in Deer Park is considered the dividing line for determining which dispatch center controls the net. If the plant with the emergency is west of Center Street, the Baytown site will handle the net. Likewise, if the emergency is east of Center Street, Pasadena will handle the net. This is to allow municipal agencies located in the affected area to be able to deal with the logistics of the problem while someone outside the area handles the radio net and coordination of plant responses.

There are several types of CIMA emergencies:
A.Standby alert
B.Assistance call
C.All out call
D.Civil defense alert
E.All clear

That's all I know at this time. i'll update with any new information.