Claims in both actions arise from the same tenancy, the same series of transactions, and involve the same witnesses. Thus, they involve common.Contra Costa County, the Crockett-Carquinez Fire Protection District, and the Contra Costa County Fire Protection. This catalog serves as a contract between you, the student, and Contra Costa College. That contract is valid as long as you are continuously enrolled. HACCC receives its funding for the Housing Choice Voucher (HCV) program from the. Department of Housing and Urban Development.