Specifications include, but are not limited to: The Contractor shall furnish labor, supervision, equipment, supplies, tools, materials, and safety measures to perform the location, inspection and maintenance of wastewater air release valves (ARVs) and isolation valves at various locations in the City-Parish. For the purpose of this contract the term Air Release Valve (ARV) includes air release valves, vacuum valves, and combination air/vacuum valves. Most of the air valves are combination valves meaning they perform both a vacuum breaking function and an air release function. Work orders will be issued periodically throughout the year to 1) locate and inspect the valves and to 2) perform general maintenance or remove and replace with City-Parish furnished materials, once located and initially inspected. There are approximately 900 ARVs and 250 isolation valves located throughout the City-Parish and general maintenance requirements are to be performed at a frequency determined by the City-Parish and as indicated on the work orders. Work Orders will include valves generally within the same geographical area.