WA L&I + OSHA
What is the minimum trench depth requiring protective systems under WA L&I?
4 feet (WAC 296-155-657)
“Danger” signs feature these two colors.
Red + White
This test measures the workability of concrete.
slump test (ASTM C-143)
This organizational system defines divisions and spec numbers.
CSI MasterFormat
Exposed vertical rebar under six feet must have these for impalement protection
What are rebar caps or covers
What are the four leading causes of construction fatalities in Washington? (Fatal Four)
Falls, struck-by, electrocution, caught-in/between
These short safety meetings should occur weekly according to best practice.
toolbox talks
Concrete should typically cure this long before full design strength.
28 days
This milestone marks when the project can be used for its intended purpose.
What is substantial completion
These steel boxes prevent trench wall collapses
trench boxes
What is the minimum distance a crane must maintain from energized power lines up to 50 kV in Washington?
10 feet (WAC 296-155-53408)
An excavation must have one of these individuals present whenever workers are inside.
a competent person
Concrete should be kept above this temperature while curing.
50 degrees
This document breaks down contract value by work item
Schedule of Values
You must call this number at least 48 hours before digging
811 (Call Before You Dig)
This color combination is used for “Caution” safety signs.
What are yellow with black letters
Training for bloodborne pathogens must occur this often.
Annually
Control joints are typically cut within this time window after finishing.
6-12 hours
This analysis reduces cost while maintaining performance
What is value engineering
This sling angle is the minimum recommended for safe lifting
30 degrees from horizontal
Class A fire extinguishers must be within this travel distance.
75 feet
This WAC section governs fall-protection requirements.
WAC 296-880
The white salt-like residue appearing on concrete surfaces is called this.
What is efflorescence
Washington public projects hold this 5 percent portion until acceptance
retainage
This plan outlines erosion and runoff controls on site
Storm Water Pollution Prevention Plan (SWPPP)