Gurugram, Aug. 27 -- At least four tankers a day are releasing toxic chemical waste into a Haryana State Industrial and Infrastructure Development Corporation Limited (HSIIDC) drain in the Manesar area, a Hindustan Times investigation has found. During a spot check, a HT team witnessed tankers, some without number plates arriving in the evening and emptying foul-smelling, dark liquid directly into the sewage drain connected to the city's sewage treatment plant (STP). When questioned, the drivers admitted they were carrying industrial chemical waste but refused to disclose where the tankers were being filled. "We cannot reveal the locations," one driver said before driving off. The unchecked dumping in the drain which passes through Manesar ...