Refuse landfills, sewage disposal plants, power plant tail slag processing, chemical plants, fertilizer plants, sugar mills sewage and tailings treatment, non-ferrous metallurgy, sulfuric acid tank, tailings disposal, subways, basements, tunnels, roof lining and other special circumstances impermeable (special); reservoirs, canals, dams, laying horizontal impervious, impermeable vertical laying; seawater, freshwater, farms seepage.