US lawWashingtonRegulationsTitle 296 — LABOR AND INDUSTRIES, DEPARTMENT OFChapter 296-155 — SAFETY STANDARDS FOR CONSTRUCTION WORK296-155-650WAC 296-155-650WAC 296-155-650. Scope and application of this partLast amended: 2026Year: 2026Length: 21 wordsOfficial source Scope and application. This part applies to all open excavations made in the earth's surface. Excavations are defined to include trenches.PreviousWAC 296-155-630NextWAC 296-155-652