Text For Citation: 01 Item/Group: 001 Hazard:

29 CFR 1926.752(b): A steel erection contractor erected steel without receiving written notification that the concrete in the footings, piers and walls and the mortar in the masonry piers and walls had attained, on the basis of an appropriate ASTM standard test method of field cured samples, either 75 percent of the intended minimum compressive design strength or sufficient strength to support the loads imposed during steel erection: (a) High Ball Erectors, LLC at 4743 Arapahoe Ave, Boulder, CO 80303: On and before May 8, 2012, the steel erector contractor erected three cantilevered steel girders that connected to three steel columns. Between, and perpendicular to the girders, were steel joists. The columns were erected and connected onto a poured concrete foundation. This structure was erected without receiving written notification that the concrete in the footings, piers and walls and the mortar in the masonry piers and walls had attained, on the basis of an appropriate ASTM standard test method of field cured samples, either 75 percent of the intended minimum compressive design strength or sufficient strength to support the loads imposed during steel erection. This condition exposed steel erector employees to struck-by hazards.