This paper reports one aspect of the author's research on the phonology of the Spanish spoken in Tucson, Arizona. The specific aspect of the research considered there concerns "levels" of speech. "Levels" refers to the systematic variation in speech form that can be observed in the speech of one individual. The empirical phenomenon that the author uses to establish various levels is rate of speech: slow, medium, fast, and very fast. After describing the research methodology employed, the author presents data on the occurrence of a particular phoneme; the occurrence is seen to vary according to a varying rate of speech. (VM)