You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. Image of Apply button.Your application template fills in the basic information for step one, and you are able to proceed with the application process steps. An incomplete application packet may disqualify an applicant. We have various applications and forms available on our web site for your convenience. Current Career Opportunities. Welcome to Central San's online application process! Volunteers will need a state identification or consulate card to apply, and clearance can take up to a week after the application is received. YES. NO If "No," indicate exceptions and reasons.