Specifications include, but are not limited to: The Work includes regular landscape annual contract paid on a monthly flat rate for regular landscaping maintenance at Seattle Tacoma International Airport; the work includes the requirements for furnishing all labor, tools, specialized equipment, materials, supervision and transportation to provide proper weed control, litter removal, removal of cuttings, care and maintenance for: irrigation systems, lawns, all planters, landscaped areas, trees, shrubs and other plant materials within the project limits for healthy growth, neatly trimmed and visually attractive landscaped areas. Time and material changes, by Work Authorizations, may be required for events and activities such as irrigation repairs, diseased/distress/dead plant replacement, herbicides, fertilizer, earth movement (slides), plant/pest control, maintenance support for mitigation areas, tree topping, tree cutting, tree removal, stump removal, hydro seeding and any other landscape/plant related items that are not normally associated with the recurring general maintenance. Recycling of waste from the projects and use of recycled products is encouraged. The contract may be renewed at the POS option for a subsequent year.