Osaka Deputy Mayor Junichi Seki on Monday apologized for the municipal government's failure to take measures to prevent the discharge of water from contaminated soil used to build Yumeshima island in Konohana Ward, Osaka, the proposed site for the athlete's village during the 2008 Olympic Games. The soil, which had been dredged from a riverbed in the city, was found to contain high levels of polychlorinated biphenyl (PCB). PCB is used in industry, but is also considered a poisonous environmental pollutant that tends to accumulate in animal tissue.