You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. The supplemental job information questionnaire should be prepared from the qualifications listed in the job announcement.Record Keeping: Contractor will be expected to maintain complete up-to-date and accurate records and management controls. Complete any required State data. This Briefing Handbook has been prepared for you as a guide to participation in the Housing. Choice Voucher Program. It presents different career opportunities that are available to you, important tips, various samples, and contact information. Contra Costa Employment Website. Information. • Always print in blue or black ink, or type. It is unknown whether many of these individuals will be able to return to their previous jobs at all in the near or distant future.