Qiligou is the main water supply source located in South Xuzhou. Karst groundwater inthis area, with area of120km2, is severely contaminated by CCl4. Since2001, we conductedlocal environment and hydrogeological investigation, explored local physical geography,measured field data, performed tracing experiments, and studied transport of CCl4based onduel-conductivity medium theory under the supporting of National Science Foundation ofChina. Amount of80research wells were studied, among which water level and CC...