(April 21, 2016, 11:27 AM EDT) -- LOS ANGELES — The U.S. Department of Justice and Environmental Protection Agency on April 20 announced that a group of 66 companies agreed to reimburse the agency for $8 million it spent on cleaning up the Omega Chemical Superfund site in Whittier, Calif., and agreed to spend $70 million to install a groundwater treatment system (United States of America, et al. v. Abex Aerospace, et al., No. 16-cv-2696, C.D. Calif.)....