In managing waste, the company seeks to reduce the amounts of waste generated, apply advanced technologies, place wastes in special facilities that meet modern environmental requirements.
Separate waste collection has been introduced at the company’s assets to dispose wastes depending on the hazard classes and categories of waste, to which the hierarchy of waste management strategies is applied.
The company’s business results in the generation of various waste types, ranging from extremely hazardous (hazard class I) to virtually non-hazardous (hazard class V) wastes for the environment. Most of the wastes are low-hazard wastes categorised as hazard classes IV and V. These mainly include well drilling wastes on offshore platforms and municipal wastes that are produced by company offices and residential complexes.
The environmental impact of waste management is mainly caused by landfilling.
Hazard class I–III wastes (mercury lamps, batteries, waste oils, diesel and oil filters, etc.) which are considered the most hazardous for environment are delivered to specialized organisations under the waste neutralization and disposal contracts.
Hazard class IV–V wastes, with the exception of drilling and municipal wastes, are disposed in the landfills of the Sakhalin Oblast (Nogliki) and Primorsky Krai (Nakhodka) for landfilling under contracts. Municipal wastes are sent to the regional solid municipal waste management operator in the Sakhalin Oblast − AO Otkhody, for disposal in landfills of the Sakhalin Oblast.
Drilling wastes are pumped deep down into the subsurface layers. As compared to the technologies of waste disposal on the ground surface, this method has a number of advantages: environmental, economic, resource-saving, and energy-saving ones. The drilling wastes are isolated deep down in the subsurface soil layers at a depth of 2 kilometres, which helps avoid their negative impact on the environment. Besides, there is no need to transport it anywhere from the place of its formation or to build special landfills and depots on the ground surface. In this case, placing of a great amount of wastes is possible. This technology was included in the ITS-17 2016 Reference Book of the best available waste placement technologies in 2016.
The company continuously monitors the injection process and takes all reasonable measures to reduce the volume of drilling waste formation. Since 2016, the company has been monitoring the state of marine waters in the near bottom layer, state of bed deposits and benthos (community of organisms that live on the ocean floor) across the underground drilling waste disposal sites. Based on monitoring results, Rosprirodnadzor confirms every year that there is no negative impact on the environment when the company disposes drilling wastes.
The company’s performance in relation to waste management is shown in the sustainable development reports.