General Contractor License Site Work and Excavation Questions and Answers

Question 1

An excavation is planned to be 10 feet deep in Type C soil. According to OSHA standards, what is the maximum allowable simple slope for the sides of this excavation?

Accepted Answer

1½ Horizontal to 1 Vertical (1½H:1V)

Answer

According to OSHA 29 CFR 1926 Subpart P, for excavations in Type C soil, the maximum allowable simple slope is 1½ horizontal to 1 vertical (34 degrees). Type C is the least stable soil classification, requiring the flattest slope for protection against cave-ins. Benching is not a permissible protective system in Type C soil.

Question 2

What is the standard laboratory test used by geotechnical engineers to determine the optimal moisture content at which a specific soil type will achieve its greatest density when compacted?

Accepted Answer

Proctor Compaction Test

Answer

The Proctor Compaction Test (either Standard or Modified) is the established laboratory method for determining the optimal moisture content and maximum dry density of a soil. This data is crucial for ensuring that fill material is properly compacted on site to provide adequate support for foundations, slabs, and pavement.

Question 3

A contractor is preparing to start a new project. To ensure all elevations for foundations, floors, and utilities are accurate, the surveyor establishes a single, stable point of known elevation on the site. What is this reference point called?

Accepted Answer

Benchmark

Answer

A benchmark is a point of known elevation from which all other vertical measurements on a construction site are referenced. While control points establish horizontal (X,Y) position, a benchmark specifically serves as the datum for vertical (Z) dimensions, ensuring consistent heights throughout the project.

Question 4

A general contractor is beginning site work for a new commercial building in a developed area. What is the legally mandated first step that must be taken to identify and prevent damage to existing underground public utilities?

Accepted Answer

Contact the national "Call Before You Dig" service by dialing 811.

Answer

State and federal law requires anyone who plans to excavate to contact their state's one-call utility location service, which is universally accessible by dialing 811. This service notifies member utility companies, who then send locators to mark the approximate location of their underground lines, preventing costly and dangerous utility strikes.

Question 5

According to OSHA regulations for excavation safety (29 CFR 1926 Subpart P), what is the minimum distance that excavated materials, known as spoil, must be placed from the edge of a trench or excavation?

Accepted Answer

2 feet

Answer

OSHA standard 1926.651(j)(2) requires that spoil piles and any other materials or equipment be kept at least 2 feet back from the edge of an excavation. This prevents the material from falling or rolling back into the excavation onto workers and reduces the surcharge load on the trench walls, which could contribute to a collapse.

General Contractor License Practice Test

General Contractor License Practice Test

General Contractor License Site Work and Excavation Questions and Answers