- Hispanic Chamber of Commerce Contra Costa County, California PO Box 23964 Pleasant Hill, CA 94523 (925)281-2623 Fax: (925) 281-2623 info@h5c.org 2nd Annual The Hispanic Drop-Out Rate: Business Leaders Narrowing the Gap H5C Business & Education Conference November 22, 2002 Diablo Valley Community College Pleasant Hill 10am to 1:30pm Click here for pictures of last year s event!! Para informacion ...h5c.org