What are Type A soils?

Type A soil is cohesive and has a high unconfined compressive strength; 1.5 tons per square foot or greater. Examples of type A soil include clay, silty clay, sandy clay, and clay loam.

What are 3 types of soil classification?

The USCS has three major classification groups: (1) coarse-grained soils (e.g. sands and gravels); (2) fine-grained soils (e.g. silts and clays); and (3) highly organic soils (referred to as “peat”). The USCS further subdivides the three major soil classes for clarification.

What is the standard slope for Type A soil?

Type A: This is the most stable of the soil classifications and implies that you have a slope angle of a 3/4:1 ratio, which means that for every foot of depth, the sides of the excavation will slope back three-quarters of a foot or a 53-degree angle.

What is OSHA Type C soil?

Type C Soils are cohesive soils with an unconfined compressive strength of 0.5 tsf (48 kPa) or less. Other Type C soils include granular soils such as gravel, sand and loamy sand, submerged soil, soil from which water is freely seeping, and submerged rock that is not stable.

What type of soil must never be benched?

Type C soil
Type C soil cannot be benched.

What type of soil is clay?

Clay Soil. Clay Soil is a heavy soil type that benefits from high nutrients. Clay soils remain wet and cold in winter and dry out in summer. These soils are made of over 25 percent clay, and because of the spaces found between clay particles, clay soils hold a high amount of water.

What are the 6 types of soil?

There are six main soil types:

• Clay.
• Sandy.
• Silty.
• Peaty.
• Chalky.
• Loamy.

What is the most common soil type?

Most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40\% sand, 40\% silt, and 20\% clay) with ample organic matter and pore space. However, some plants grow better in sandy soils, while others are well-adapted to clay soils.

Can you slope Type C soil?

The incline of a slope for TYPE C soil is the flattest since TYPE C soil is the least cohesive and the most flowable. For TYPE C soil and a trench depth of less than 20 feet, the steepest maximum allowable slope is 34 degrees from the horizontal. This translates to a 1H: 1.5V incline and is shown below.