Ricardo Ramirez seemed an unlikely success story: At 57, the former Marine Corps judo instructor had spent more than 20 years as a paving contractor and had little to show for it but a long string of lawsuits, business failures and bankruptcies. Then, in 1998, the struggling businessman appeared to hit upon a way to make it in a new venture. Taking advantage of city and state programs designed to help minority-owned businesses, Ramirez started turning out low-priced, locally produced concrete for projects that included earthquake retrofit work on the Golden Gate Bridge and the Bay Bridge. By 2003, his...
