Most wastes from RusHydro Group’s generating assets are wastes belonging to hazardous classes IV and V. They include low-hazard wastes, such as soil stripped during coal mining, bottom coal ashes, and waste from construction and repairs. Accumulated waste is collected by specialized contractors duly licensed to collect, transport and treat such waste. (306-4)

Item	2016	2017	2018	2018/2017, %
RusHydro Subgroup
Hazardous waste class I and II	21	31	18	–42
Hazardous waste class III, IV and V	29,179	29,191	23,178	–21
Total	29,200	29,222	23,196	–21
RAO ES East Subgroup
Hazardous waste class I and II	33	39	45	15
Hazardous waste class III, IV and V	24,743,429	26,570,307	29,596,949	11
Total	24,743,462	26,570,346	29,596,995	11
RusHydro Group
Hazardous waste class I and II	54	70	63	–10
Hazardous waste class III, IV and V	24,722,608	26,599,498	29,620,127	11
Total	24,772,662	26,599,569	29,620,190	11

A 11% year-on-year increase in wastes is mostly attributable to an increase in wastes belonging to hazardous class V due to:

• more bottom ash produced as a result of higher coal consumption at DGK, PJSC Sakhalinenergo, PJSC Kamchatskenergo, and PJSC Magadanenergo;
• more overburden resulting from larger-scale stripping operations at JSC LCM.