We strive to minimize the environmental impact of generating, storing, transporting and disposing of waste from our operations.
Our operations generate a variety of waste streams, including spent batteries and filters; scrap metal; tank cleaning residue; contaminated soil; office and domestic waste such as paper and light bulbs; and items specific to drilling and production operations.
In 2015, we disposed of approximately 743 thousand tons of waste off-site, nearly all (< 99.99 percent) of which was deemed non-hazardous according to applicable regulations. The volume of waste decreased by 2 percent, relatively flat compared to 2014. Produced water and process wastewater are not included in the waste inventory in accordance with IPIECA’s Oil and Gas Industry Guidance on Voluntary Sustainability Reporting.
Company assets develop waste management programs targeting their specific operations. For example, in 2015 Oklahoma implemented a program to reduce the volume of drilling cuttings going to landfills. The program includes separating and recycling oil from oil-based drill cuttings and using the dry cuttings as landfill cover.
Additionally, under our Waste Management Vendor Approval Program, Marathon Oil reviews vendors’ HES&S programs and past regulatory compliance performance. Vendors with the highest identified risk undergo an onsite audit, usually conducted by a third party, and are approved or rejected for use based on the audit results. Common reasons for rejecting vendors are significant prior fines and poor safety and environmental performance.