A contractor seeking prequalification under this chapter will be classified for one or more of the following listed work classes in accordance with the adequacy of the firm's equipment and plant facilities and its demonstrated ability to perform the work class sought.

Class 1	Clearing, grubbing, grading and draining
	Removal of tree stumps, shrubs, modification of the ground surface by cuts and fills, excavating of earth materials, placement of drainage structures, and construction of structural earth walls.
Class 2	Production and placing of crushed materials
	Production and placing crushed surfacing materials and gravel.
Class 3	Bituminous surface treatment
	Placing of crushed materials with asphaltic application.
Class 4	Asphalt concrete paving
	Production and placing Asphalt Concrete Plant Mix Pavement.
Class 5	Cement concrete paving
	Production and placing cement concrete pavement.
Class 6	Bridges and structures
	Construction of bridges and other major structures of timber, steel, and concrete.
Class 7	Buildings
	Construction of buildings and related structures and major reconstruction and remodeling of such buildings.
Class 8	Painting
	Painting bridges, buildings, and related structures.
Class 9	Traffic signals
	Installation of traffic signal and control systems.
Class 10	Structural tile cleaning
	Cleaning tunnels, large buildings and structures and storage tanks.
Class 11	Guardrail
	Construction of a rail secured to uprights and erected as a barrier between, or beside lanes of a highway.
Class 12	Pavement marking (excluding painting)
	Thermoplastic markings, stripes, bars, symbols, etc. Traffic buttons, lane markers, guide posts.
Class 13	Demolition
	Removal of timber, steel, and concrete structures and obstructions.
Class 14	Drilling and blasting
	Controlled blasting of rock and obstructions by means of explosives.
Class 15	Sewers and water mains
	Draining, pipe jacking, water systems, pumping stations, storm drainage systems, sewer rehabilitation, sewage pumping stations, pressurized lines.
Class 16	Illumination and general electrical
	Highway illumination, navigational lighting, wiring, junction boxes, conduit installation.
Class 17	Cement concrete curb and gutter
	Sidewalks, spillways, driveways, monument cases and covers, right of way markers, traffic curbs, and gutters.
Class 18	Asphalt concrete curb and gutter
	Sidewalks, spillways, driveways, monument cases and covers, right of way markers, traffic curbs, and gutters.
Class 19	Riprap and rock walls
	Mortar, rubble, and masonry walls; rock retaining walls, and placing of large broken stone on earth surfaces for protection against the action of water.
Class 20	Concrete structures except bridges
	Cast-in-place median barrier, prestressing, post-tensioned structures, footings, prefabricated panels and walls, retaining walls, and ramps, foundations, rock bolts, and concrete slope protection.
Class 21	Tunnels and shaft excavation
	Tunnel excavation, rock tunneling, and soft bore tunneling.
Class 22	Piledriving
	Driving concrete, steel, and timber piles.
Class 23	Concrete surface finishes
	Architectural concrete surface finishes (fractured fin, random board, exposed aggregate, etc.). Waterproofing concrete surfaces (clear or pigmented sealer).
Class 24	Fencing
	Wire and metal fencing, glare screens.
Class 25	Bridge deck repair
	Bridge expansion joint repair and modification, bridge deck resurfacing and repair, deck seal.
Class 26	Not used
Class 27	Signing
	Sign structures and sign foundations.
Class 28	Drilled large diameter slurry shafts
	Drilled shafts 4' diameter or larger and greater than 15' deep when excavation is performed utilizing the wet method and concrete is placed by tremie methods under slurry.
Class 29	Slurry diaphragm and cut-off walls
	Slurry excavation and the construction of structural concrete walls and slurry cut-off walls.
Class 30	Surveying
	Highway construction surveying.
Class 31	Water distribution and irrigation
	Irrigation systems and heavy duty water distribution.
Class 32	Landscaping
	Landscape irrigation, planting, sodding, seeding, fertilizing, mulching, herbicide application, insecticide application, weed control, mowing, liming, soil binder, topsoil.
Class 33	Engineering
	Work other than surveying, including engineering calculations, drawing and other related work for highway construction.
Class 34	Erosion control
	Seeding, fertilizing, mulching, slope protection, topsoil application, hydro-seeding, soil stabilization, soil sampling.
Class 35	Precast median barrier
	A concrete barrier that is cast and cured in other than its final position used to divide the median of two adjacent highways or temporarily placed to divert traffic in construction zones.
Class 36	Earth retention and anchoring
	Installation of permanent soil nails, soldier piles, timber lagging and micropiles. Soldier pile tie-back anchor wall construction.
Class 37	Impact attenuators
	Installation of approved protective systems filled with sand, water, foam, or other substances which prevent errant vehicles from impacting roadside hazards.
Class 38	Paint striping
	Painted bars, letters, symbols, and striping.
Class 39	Slope protection
	The installation of a zinc coated steel wire mesh anchored by wire rope and reinforced concrete posts or anchor rods. Used for dampening the effects of rolling rocks onto the highway. Slope scaling, horizontal drains, rock dowels, and rock bolts for slope stabilization.
Class 40	Gabion and gabion construction
	Construction of walls made with containers of galvanized steel hexagonal wire mesh and filled with stone.
Class 41	Intelligent transportation systems (ITS)
	Traffic sensors systems, highway advisory radios, environmental sensing stations, variable message signs, nonfiber optic based closed circuit television, and video systems.
Class 42	Electronics - Fiber optic based communications systems
	Design and installation of fiber optic based communication systems.
Class 43	Mechanical
	Plumbing work and the installation of heating or air conditioning units.
Class 44	Asbestos abatement
	Asbestos abatement (L & I certified workers).
Class 45	Hazardous waste removal
	The containment, cleanup, and disposal of toxic materials. Companies seeking this classification shall have full-time personnel with current hazardous waste training (certifications).
Class 46	Concrete restoration
	Pavement subseal, cement concrete repair, epoxy coatings, epoxy repair, masonry repair, masonry cleaning, special coatings, epoxy injection, gunite, shotcrete grouting, pavement jacking, gunite repair, and pressure grouting.
Class 47	Concrete sawing, coring, and grooving
	Concrete sawing, concrete planing, grinding, grooving, bump grinding, joint repair, concrete coring and rumble strips.
Class 48	Dredging
	Excavating underwater materials.
Class 49	Marine work
	Underwater surveillance, testing, repair, subaquatic construction, anchors, and cable replacement, floating concrete pontoon repairs and modifications, disassembly and assembly of floating concrete pontoons.
Class 50	Ground modification
	Pressure grouting, blast densification, stone column, jet grouting, compaction, dynamic compaction, soil mixing, gravel drain.
Class 51	Well drilling
	Drilling wells, installing pipe casing and pumping stations.
Class 52	Sewage disposal
	Hauling and disposing liquid and solid wastes.
Class 53	Traffic control
	Providing piloted traffic control, traffic control labor, and maintenance and protection of traffic.
Class 54	Railroad construction
	Construction of railroad subgrade, placing of ballast, ties, and track and other items related to railroad work.
Class 55	Steel fabrication
	Welding of steel members, heat straightening steel.
Class 56	Street cleaning
	Street sweeping with self-propelled sweeping equipment.
Class 57	Materials transporting
	Truck hauling.
Class 58	Sand blasting and steam cleaning
	Steam cleaning, sand blasting, shot blasting, and water blasting.

PDFWAC 468-16-130

Prequalification work classes.