When applicant first began his employment with Kaiser Cement in 1966, he worked four to five months as a laborer. The last four years applicant was employed by Kaiser Cement he worked as a heavy equipment operator. Dr. Billings described the occupational noise exposure at Kaiser Cement as 'Mill noise about 20% of the time while employed as a laborer by Kaiser Cement from 1966 to 1968 and about 50% of the time while employed as an electrician/oiler by Kaiser Cement from 1973 to 1979. The medical report of Dr. Riordan noted in applicant's medical history that applicant was exposed to noise while performing his duties for Kaiser Cement. His exposure to noise while employed by Kaiser Cement is the major causative factor of the noise-induced portion of this bilateral sensori-neural hearing loss.

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