You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. You must also complete and submit any additional information listed on the job announcement.Voluntary non-paid experience will be accepted if job related. We are currently looking to fill one (1) vacancy in the Contra Costa Health Department. Cover letter explaining your interest in the position. Denotes a required field. Use Profile to update basic information that you use to apply for jobs, such as work experience. You've got a great resume —now let's make sure employers actually read it. Watch this step-by-step video to create a compelling cover letter. Through in an attempt to obtain employment in the Contra Costa Community College District.