You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. A job offer letter is a document that a Canadian employer gives you (as a temporary worker).It explains the details of your job. An incomplete application packet may disqualify an applicant. You get a valid work permit and the right to work in Canada, otherwise no one will offer you a job. The Contra Costa County Office of Education is now providing email notifications for upcoming employment opportunities with the CCCOE. Let's get you to the information you need to make your job search or your employee recruitment effort a success. I am… an adult job seeker. Visit the official Earth Day site to learn about the world's largest environmental movement and what you can do to make every day Earth Day. Prepare your people and stay in compliance using industry-specific training, operational readiness, workforce management, and risk management solutions.