A factory that makes jeans for Gap and Levi Strauss is illegally dumping chemical waste in a river and two unsecured tips where it poses a hazard to children...Dark blue effluent from the factory of Nien Hsing, a Taiwanese firm, was pouring into a river from which people draw water for cooking and bathing...Yesterday Gap and Levi Strauss said they had ordered immediate investigations. Gap, which has a public image of environmental awareness, put the factory “on notice” to improve. Levi Strauss said it was “disturbed” to see that water was being polluted.