 The zone is home to nearly 200 chemical plants including Zhenhai Refining and Chemical Corporation (ZRCC), a subsidiary of Sinopec and the largest oil refinery in China, LG-Yongxing, the largest ABS plastic producer in China and Zhenhai Port Liquid Chemical Dock, the largest liquid chemical dock in China.In September, 2007, 400 tones of acrylonitrile leaked from the LG-Yongxing plant and polluted air and underground water around adjacent areas.In late April, 2012, three million bees died in an orchard in Xiepu Town next to the Petro-Chemical Zone because of pollutants discharged by a chemical plant.