Ability to: prepare written work orders, requisition supplies, and prepare specifications; read and interpret repair orders, service manuals and building codes; read and interpret blueprints, construction drawings, and electrical schematics; plan projects, sketch working drawings, and lay out materials; estimate the materials and time required to complete projects; add, subtract, multiply and divide whole numbers, fractions and decimals to calculate dimensions, volumes, capacities, material needs and lay out projects; work on ladders and scaffolding and in confined building access areas; use various diagnostic and testing equipment. Perform skilled plumbing work to maintain, repair, and modify plumbing systems and fixtures; review blueprints and determine the best method of modifying the plumbing system in accordance with code requirements; determine the type, quantity and cost of materials needed; replace lines by measuring and cutting pipe, assemble pipes and fittings, and join pipes by threading or soldering; install and repair hot water heaters; repair three-phase electric well pumps and controls.