张家界一天然溶洞遭排污：已清运垃圾2.7吨，清理仍将持续

Group 1 - The pollution incident in a natural cave in Cili County, Zhangjiajie City, Hunan Province has prompted a comprehensive cleanup and investigation effort, with 2.7 tons of waste removed from the Yangjiapo cave in the past week [1] - The pollution is attributed to historical negligence, with waste accumulation dating back ten years when there was no unified garbage collection system and low environmental awareness among residents [1] - Local authorities are implementing multiple measures to address the pollution, including setting up no-dumping signs, enhancing livestock farm supervision, and monitoring water quality in the Liao River basin to ensure drinking water safety [2] Group 2 - The pollution was first detected on May 8, following heavy rainfall that caused wastewater to flow into the Changtan River, leading to an investigation that identified the pollution source by May 22 [2] - The Cili County Environmental Risk Investigation and Disposal Task Force has initiated legal proceedings against three livestock farmers suspected of illegal waste discharge [2] - Current monitoring results indicate that the water quality of the Liao River drinking water source is stable and meets Class II surface water standards [2]