General Information. Register online in the County's vendor database as the first step in the County procurement process.Find out more at the Purchasing Division's webpage. Forms ; ADOPT-230, Adoption Expenses ; ADOPT-310, Contact After Adoption Agreement ; ADOPT-315, Request to: Enforce, Change, End Contact After Adoption Agreement. Please make your check or money order payable to Contra Costa County Tax Collector. The Skillup Contra Costa Metrix Learning portal offers online computer classes from basic computer skills to web development and cyber security. The Contra Costa County Office of Education coordinates local education programming for the Contra Costa County Education Channel, edTV. Documents are recorded within two (2) business days of receipt of the document. The average turnaround time for a document submitted for recording is 30 days. Contra Costa County Office of Education Contra Costa Intranet.