Cornerstone Gas Marketing LLC

Fluor Corporation is one of the world's largest, publicly owned engineering, procurement, construction and maintenance services companies. Clients rely on Fluor to deliver world-class solutions that optimize their assets, improve their competitive position and increase their long-term business success. The company s primary objective is to develop, execute and maintain capital projects on schedule, within budget and with operational excellence. The individual and collective experience of its international work force of more than 35,000 employees provides cost-effective, intelligent solutions in a timely manner. In addition to project offices, Fluor maintains a network of offices in more than 25 countries throughout six continents. It serves clients in a variety of traditional and evolving industries worldwide, such as chemicals and petrochemicals, commercial and institutional, government projects, health care, life sciences, manufacturing, microelectronics, mining, oil and gas, power and telecommunications and transportation infrastructure. Alan L. Boeckmann has been the chief executive officer of Fluor for more than four years. He has been with the construction company for over 32 years. Boeckmann earned a BSEE degree from the University of Arizona. Fluor Corporation has a location in Aliso Viejo, Calif.

Crosstex Energy, a publicly traded company, is a part of Crosstex Energy Services, which is engaged in midstream natural gas business. The company maintains a work force of more than 750 employees. Crosstex Energy Services provides gas processing, transmission and distribution services. The company maintains an over 5,000 miles of pipeline. Crosstex Energy Services has nearly 170 gas plants and fractionation facilities. The company offers transportation, accounting, administration, and risk and imbalance management services. Crosstex Energy Services provides is also engaged in the design, procurement and installation of gas processing and conditioning facilities. Established in 1996, the company markets natural gas liquids.

Keystone acts as a holding company for various real estate ventures in many locations. The company is part of a larger group of holding companies, which has ventures in several other industries, including investments, oil, gas and development. Keystone, along with many of its sister companies, maintains its headquarters in Fort Worth, Texas.