Officially known as the Operating Industries Incorporated facility, this is a dump site in Montebello, a mound rising abruptly next to the freeway. The dump started in the 1950s, by filling a hole in the ground, a former quarry for rock that was used to build the freeways. In the 1960s, Highway 60 was built through the dump site, which continued to accept waste until 1984, when it began its next life as a remediation site. The federal government put the site on the Superfund priority list for clean up.
