Per OSHA, A visual test is a qualitative evaluation of conditions around the site. In a visual test, the entire excavation site is observed, including the soil adjacent to the site and the soil being excavated. If the soil remains in clumps, it is cohesive; if it appears to be coarse-grained sand or gravel, it […]

What is Maximum Allowable Slope? Per OSHA, Maximum allowable slope means the steepest incline of an excavation face that is acceptable for the most favorable site conditions as protection against cave-ins, and is expressed as the ratio of horizontal distance to vertical rise (H:V). [Source] Of note: Maximum Allowable Slope is a term that has […]

Trench collapses, or cave-ins, pose the greatest risk to workers’ lives. When done safely, trenching operations can reduce worker exposure to other potential hazards include falls, falling loads, hazardous atmospheres, and incidents involving mobile equipment. Trenches 5 feet (1.5 meters) deep or greater Trenches 5 feet (1.5 meters) deep or greater require a protective system […]

The National Utility Contractors Association (NUCA) has declared June 2021 as “Trench Safety Month”. This is the second year of Trench Safety Month which NUCA devoted to getting the message out about the importance of employee safety when working underground or in and around trenches. The designation of Trench Safety Month further highlights NUCA’s “Trench […]

Many kinds of equipment and methods are used to determine the type of soil prevailing in an area, as described below (from OSHA). Pocket Penetrometer Penetrometers are direct-reading, spring-operated instruments used to determine the unconfined compressive strength of saturated cohesive soils. Once pushed into the soil, an indicator sleeve displays the reading. The instrument is […]