Weston assisted Calpine power company with decommissioning an aging 344-MW gas-fired power cogeneration facility with the goal of restoring the property to its pre-facility condition and ultimately transferring the lease back to the original landowner. Weston performed a limited environmental site assessment to quantify historical impacts from Calpine’s operations, which resulted in documentation that the condition of the land had not been negatively impacted by Calpine’s operations. Weston also obtained closure of the solid waste management units listed on the facility’s notice of registration and selected and managed a contractor to remove and dispose of lubricating oil and hydraulic fluid from gas combustion turbines, steam turbines, associated supply lines, storage tanks, and transformers. Additionally, Weston performed an asbestos and lead-based paint survey prior to decommissioning activities to confirm demolition materials were free of asbestos and lead-based paint to ensure compliant disposal requirements prior to decommissioning. Weston completed the decommissioning tasks within a tight one-month schedule to meet contractual obligations with the original landowner as well as minimize the environmental liability of the property, resulting in Calpine successfully transferring the lease back to the original landowner.