The Contractor shall provide all labor, transportation, tools, equipment, materials, and expertise necessary to perform single-site seasonal preventive maintenance and operational tune-ups on four (4)... The Contractor shall provide all labor, transportation, tools, equipment, materials, and expertise necessary to perform single-site seasonal preventive maintenance and operational tune-ups on four (4) Western Shelter CL-ACXE1200 Environmental Control Units (ECUs) located in Sterling, Virginia.