PDFWAC 296-17A-3506
Classification 3506.
3506-02 Mobile crane and hoisting services; Rigging contractors, N.O.C.
Applies to:
Mobile crane and hoisting services and rigging contractors not covered by another classification (N.O.C.).
There are many types of cranes and derricks, both stationary and nonstationary. A mobile crane is a tire-mounted machine for hoisting and moving heavy objects by cables attached to a moveable boom. Rigging consists of a system of ropes, chains, cables, or tackle used for support.
Work activities include, but are not limited to:
• Maintaining a variety of nonmobile cranes and derricks such as those used for construction of tall buildings or structures;
• Responding to and servicing customer requests such as righting an overturned tractor trailer, hoisting a large bell, or placement of a satellite dish on top of a building;
• Transporting of a nonmobile crane or derrick to and from a customer site.
Exclusions:
• Construction or erection of permanent nonmobile cranes (such as those permanently mounted at a manufacturing plant or seaport to load cargo) is classified in 0508.
• Set up, erection, operating, and disassembling of cranes, hoisting devices or rigging in connection with work covered under a construction classification is classified in the construction classification applicable for the work being performed.
Special note: This classification includes mobile crane and hoisting businesses when providing a service at a construction site such as lifting an air conditioning unit to a building top and provided the crane operator is an employee of the crane and hoisting business.
3506-03 Concrete pump truck service
Applies to:
Concrete pump truck services, including the pump truck control box operator.
A concrete pump truck is a large vehicle equipped with an adjustable boom spanning approximately 65' in length equipped with a flexible 4" hose running alongside the boom. This type of vehicle is different from a concrete ready-mix truck which mixes the concrete in a rotating or revolving drum prior to arriving at the project site and discharges the mix with use of a metal chute. A concrete pump truck is designed to pump concrete into areas which are difficult for a concrete ready-mix truck to reach, or into an area with limited access.
Work activities include, but are not limited to:
• Feeding concrete into the bed of the pump truck (usually by a ready-mix concrete truck);
• Receiving instructions from a construction worker overseeing the concrete pour, such as for a tall retaining wall, the foundation of a building or structure many feet below ground level;
• Adjusting the boom and amount of concrete mix to discharge, which is done by the driver of the pump truck operating the control box.
Exclusions:
• Ready-mix concrete dealers who deliver concrete are classified in 3101.
• All other concrete construction activities occurring at the project site are to be reported separately in the classification applicable to the construction work being performed.
Special note: This classification is limited to the concrete pump truck driver and operation of the control box. Construction workers at the project site, such as workers who are positioning and repositioning the end of the boom which discharges concrete, or workers who provide instructions with use of a headset to the control box operator, or workers who are spreading the concrete as it is poured, are to be reported separately in the classification applicable to the construction work being performed.
[Statutory Authority: RCW 51.04.020 and 51.16.035. WSR 25-23-070, s 296-17A-3506, filed 11/18/25, effective 1/1/26; WSR 20-20-108, § 296-17A-3506, filed 10/6/20, effective 1/1/21. WSR 07-01-014, recodified as § 296-17A-3506, filed 12/8/06, effective 12/8/06. Statutory Authority: RCW 51.16.035. WSR 98-18-042, § 296-17-590, filed 8/28/98, effective 10/1/98; WSR 96-12-039, § 296-17-590, filed 5/31/96, effective 7/1/96. Statutory Authority: RCW 51.04.020(1) and 51.16.035. WSR 90-13-018, § 296-17-590, filed 6/8/90, effective 7/9/90. Statutory Authority: RCW 51.16.035. WSR 85-24-032 (Order 85-33), § 296-17-590, filed 11/27/85, effective 1/1/86; WSR 83-24-017 (Order 83-36), § 296-17-590, filed 11/30/83, effective 1/1/84; Order 73-22, § 296-17-590, filed 11/9/73, effective 1/1/74.]