(January 24, 2024, 8:40 AM EST) -- RIVERSIDE, Calif. — The California Regional Water Quality Control Board, Santa Ana Region, did not violate the California Water Code by finding that an engineering company’s attempts to mitigate hazardous tetrachloroethylene (PCE) vapors at its facility were inadequate because the board did not order the company to perform any specific kind of mitigation work, a California panel found in affirming a trial court’s decision to deny a company’s petition for writ of administrative mandate....