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Charah Solutions, Inc. provides environmental services to the power generation industry in the United States. The company offers remediation and compliance services, including environmental management of landfills for coal-fired power generation facilities and new and existing ash ponds; and active pond management services, such as closure by removal, cap-in-place, and design and construction of new ponds. Its remediation and compliance services also include landfill development, construction, and management; site evaluation and characterization; preliminary design and cost estimates with life-cycle analysis; hydrogeological assessment; groundwater and containment modeling; permit application and processing for expansions and greenfield sites; design engineering; construction of landfills and cap and cover systems; conversion of impoundments to landfill sites; quality assurance and control, and documentation; engineered fills (off-site); and other related services. In addition, the company recycles recurring and contracted volumes of coal-fired power generation waste byproducts comprising bottom ash, fly ash, and gypsum byproducts for the use in various industrial purposes. Further, it provides coal ash management services; fossil services that include silo management, on-site ash transportation, and capture and disposal of ash byproduct from coal power operations; and manages combustion byproducts comprising bottom ash, as well as disposal of flue gas desulfurization gypsum, Pozatec/fixated scrubber sludge, and fluidized bed combustion fly ash; and environmental risk transfer services that manages the sites' remediation requirements. The company was founded in 1987 and is headquartered in Louisville, Kentucky.

CARBO Ceramics Inc., a technology company, provides products and services to the oil and gas, industrial, and environmental markets worldwide. It operates through two segments, Oilfield and Industrial Technologies and Services, and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells oilfield ceramic technology products, base ceramic proppants, and frac sand proppants to pressure pumping companies, and oil and gas operators for use in the hydraulic fracturing of natural gas and oil wells. It also provides technology to design, build, and optimize the Frac; sells fracture stimulation software under the FracPro brand; and offers fracture design and consulting services to oil and natural gas exploration and production companies under the StrataGen brand name. The Environmental Technologies and Services segment provides spill prevention, containment, and countermeasure systems for the oil and gas industry. CARBO Ceramics Inc. was founded in 1987 and is headquartered in Houston, Texas.

Lonestar Resources US Inc., an independent oil and gas company, engages in the acquisition, development, exploration, and production of unconventional oil, natural gas liquids, and natural gas properties in the United States. It primarily focuses on Eagle Ford Shale properties that cover an area of 52,861 net acres in Texas counties. The company was incorporated in 2015 and is headquartered in Fort Worth, Texas.

Obsidian Energy Ltd. explores for, develops, and produces oil and natural gas in western Canada. It holds interests in the Alberta Viking, Cardium, Deep Basin, and Peace River areas. The company was formerly known as Penn West Petroleum Ltd. and changed its name to Obsidian Energy Ltd. in June 2017. Obsidian Energy Ltd. was founded in 1979 and is headquartered in Calgary, Canada.

Pacific Coast Oil Trust is a statutory trust. The company owns net profit interests in the underlying properties, which consist of producing and non-producing interests in oil units, wells and lands. Its properties include Santa Maria Basin, Orcutt Conventional, Orcutt Diatomite, Careaga formation, Los Angeles Basin, West Pico, Sawtelle and East Coyote. The company was founded on January 3, 2012 and is headquartered in Austin, TX.