See p.236-7 under point 5.
"The Ministry of Environment & Forest regulates the recycling/reprocessing of hazardous wastes such as used/waste oil, used lead acid batteries and other non-ferrous metal waste under registration scheme, with the objective of channelizing such waste to only those units which possess Environmentally Sound Management (ESM) facilities."
"At drill sites waste water generated during drilling activities is collected in a waste pit that lined with High Density Poly Ethylene Sheets (HDPE). The waste water from waste pit is recycled for mud preparation and other uses. In North East Sector, where heavy rainfall takes place, waste water is treated by mobile ETPs and reused to avoid overflow of water from waste pits to nearby areas. In onshore locations, part of treated produced water is used for water injection into the reservoir for pressure maintenance; the remaining quantities are re-injected into sub surface disposal wells located 1000 mts underground. In offshore location, treated produced water is disposed 40 mts below the sea surface. The company has developed a comprehensive corporate waste management policy to quantify and, segregate waste at the source for better planning and management."