Specifications include, but are not limited to: Maintenance, service and repair may include, but is not limited to the following: • Replace and/or repair broken irrigation supply lines and lateral lines.; • Replace and/or repair electric and hydraulic irrigation valves and valve assemblies.; • Replace and/or repair hydraulic irrigation tubes.; • Repair irrigation heads.; • Replace or repair irrigation control clocks.; • Install new control wiring.; • Repair irrigation clock and control wires.; • Troubleshoot and advise service and repair to irrigation wells and variable speed drive systems.; • Locate control wires.; • Repair/rebuild hydraulic valves in irrigation heads.; • Test, service, and repair and/or replace back flow devices.; • When requested, perform spring start-up of irrigation systems; • When requested, perform winterization of irrigation systems.; • Monitor irrigation systems for leaks, clock operation, clock adjustment and overall performance of the systems.; • Identify and verify on district provided maps or drawings: isolation valves, system water supplies, domestic or well, zone valves, control clocks, and back-flow devices.