Further, guidelines containing the responsibility and delegation at different levels in environment discipline were formulated by CIL, but the same were not dovetailed in their operating manual by the subsidiaries, according to the CAG report on 'Assessment of Environment Impact due to Mining Activities and its Mitigation in Coal India Ltd and its Subsidiaries'.
CAG further said the pollutants exceeded the limits prescribed by the Bureau of Indian Standards (BIS) in eight mines across three subsidiaries of CIL.
"Further during 2013-18, 62 lakh kilo-litre (KL) of untreated water was discharged to nearby water bodies by Lakhanpur and Basundhara (W) mines of MCL thereby contaminating ground water," it said.
Coal India arms CCL, BCCL and SECL continued to use ground water for their mining operations without obtaining no objection certificate from Central Ground Water Authority. The subsidiaries did not install sewage treatment plant at the residential colonies of the collieries, thereby contaminating the ground water.
"Due to absence of mechanical brooming/industrial cleaner in Piparwar OCM of CCL, the spillage from overloaded truck/dumpers accumulated along the sides of the bridge of Safi river, was not cleaned periodically," it said.
These eventually drained into the river, thereby contaminating the water. Further, the rejects of Kathara washery of CCL were found to be contaminating the Damodar river.