ICC ECC SOILS CODES MODULE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
1. Site Classification and Soil Investigation
2. Earthwork and Grading Principles
3. Excavation, Trenching, and Shoring
4. Foundations and Bearing Capacity
5. Retaining Walls and Lateral Earth Pressure
6. Compaction and Soil Stabilization
7. Erosion and Sediment Control
8. International Building Code (IBC) and ICC Soil Regulations
9. Professional Ethics and Legal Responsibilities
10. Health and Safety in Soil Operations
Introduction
This comprehensive examination is designed to rigorously assess a candidate's mastery of the International Code
Council (ICC) soils codes, specifically tailored for the ECC module. The exam evaluates both foundational
theoretical knowledge and its practical application in the field, ensuring professionals can navigate the
complexities of geotechnical engineering within a regulatory framework. Through a combination of multiple-
choice and scenario-based questions, candidates will be tested on their ability to interpret soil reports, apply code
requirements to real-world construction challenges, and make critical decisions that impact public safety and
,project viability. The assessment emphasizes a holistic understanding of soil mechanics, site management, and the
ethical responsibilities inherent in professional practice.
SECTION ONE: QUESTIONS 1 – 100
1. According to the IBC, what is the minimum required horizontal distance from the toe of an excavation to the
bottom of a foundation footing?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢A
🔴 RATIONALE: The IBC generally requires a minimum horizontal distance of 6 inches from the toe of the
excavation to the footing bottom to ensure adequate soil bearing capacity and prevent edge failure.
2. A soil sample has a void ratio of 0.65 and a specific gravity of solids of 2.70. What is its dry unit weight?
A. 105.5 lb/ft³
B. 118.7 lb/ft³
C. 136.2 lb/ft³
D. 95.4 lb/ft³
,🟢A
🔴 RATIONALE: The dry unit weight (γd) is calculated as γd = (Gs * γw) / (1 + e). With Gs = 2.70, γw = 62.4 pcf,
and e = 0.65, we get (2.70 * 62.4) / 1.65 = 102.1 pcf, which is approximately 105.5 pcf. Option A is the closest
calculated value.
3. A contractor discovers an uncharted underground utility line during a grading operation. What is the FIRST
required action?
A. Cover it back up and continue grading to avoid delays.
B. Notify the utility company and the building official.
C. Excavate around it to identify the line.
D. Divert the line to a new location.
🟢B
🔴 RATIONALE: The primary and immediate requirement is to notify the utility company and the building
official. This ensures safety and compliance with regulations regarding utility strikes and damage.
4. Which of the following is the MOST critical factor in determining the allowable bearing pressure for a shallow
foundation on cohesionless soil?
A. The plasticity index of the soil.
B. The soil's dry unit weight.
C. The depth of the foundation and the soil's relative density.
D. The liquid limit of the soil.
🟢C
, 🔴 RATIONALE: The bearing capacity of cohesionless soils is primarily a function of its relative density and the
depth of embedment. These factors govern the soil's ability to resist shear failure and settlement.
5. In a compacted earth fill, the moisture content is measured at a level significantly below the optimum
moisture content. What is the MOST likely outcome?
A. The fill will have a higher than required dry density.
B. The fill will be susceptible to excessive settlement and low shear strength.
C. The fill will be less permeable and more stable.
D. The fill will be easier to compact to its maximum density.
🟢B
🔴 RATIONALE: Compacted below optimum moisture content, the soil particles have insufficient water for
lubrication, leading to inadequate compaction. This results in lower dry density, a more open structure, and high
susceptibility to settlement and low shear strength when saturated.
6. The International Building Code requires that a geotechnical investigation be performed for which of the
following situations?
A. All commercial building projects.
B. Projects where the building official has reason to believe the soils are problematic.
C. Only when the project is over two stories.
D. Construction of single-family dwellings.
🟢B
RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
1. Site Classification and Soil Investigation
2. Earthwork and Grading Principles
3. Excavation, Trenching, and Shoring
4. Foundations and Bearing Capacity
5. Retaining Walls and Lateral Earth Pressure
6. Compaction and Soil Stabilization
7. Erosion and Sediment Control
8. International Building Code (IBC) and ICC Soil Regulations
9. Professional Ethics and Legal Responsibilities
10. Health and Safety in Soil Operations
Introduction
This comprehensive examination is designed to rigorously assess a candidate's mastery of the International Code
Council (ICC) soils codes, specifically tailored for the ECC module. The exam evaluates both foundational
theoretical knowledge and its practical application in the field, ensuring professionals can navigate the
complexities of geotechnical engineering within a regulatory framework. Through a combination of multiple-
choice and scenario-based questions, candidates will be tested on their ability to interpret soil reports, apply code
requirements to real-world construction challenges, and make critical decisions that impact public safety and
,project viability. The assessment emphasizes a holistic understanding of soil mechanics, site management, and the
ethical responsibilities inherent in professional practice.
SECTION ONE: QUESTIONS 1 – 100
1. According to the IBC, what is the minimum required horizontal distance from the toe of an excavation to the
bottom of a foundation footing?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
🟢A
🔴 RATIONALE: The IBC generally requires a minimum horizontal distance of 6 inches from the toe of the
excavation to the footing bottom to ensure adequate soil bearing capacity and prevent edge failure.
2. A soil sample has a void ratio of 0.65 and a specific gravity of solids of 2.70. What is its dry unit weight?
A. 105.5 lb/ft³
B. 118.7 lb/ft³
C. 136.2 lb/ft³
D. 95.4 lb/ft³
,🟢A
🔴 RATIONALE: The dry unit weight (γd) is calculated as γd = (Gs * γw) / (1 + e). With Gs = 2.70, γw = 62.4 pcf,
and e = 0.65, we get (2.70 * 62.4) / 1.65 = 102.1 pcf, which is approximately 105.5 pcf. Option A is the closest
calculated value.
3. A contractor discovers an uncharted underground utility line during a grading operation. What is the FIRST
required action?
A. Cover it back up and continue grading to avoid delays.
B. Notify the utility company and the building official.
C. Excavate around it to identify the line.
D. Divert the line to a new location.
🟢B
🔴 RATIONALE: The primary and immediate requirement is to notify the utility company and the building
official. This ensures safety and compliance with regulations regarding utility strikes and damage.
4. Which of the following is the MOST critical factor in determining the allowable bearing pressure for a shallow
foundation on cohesionless soil?
A. The plasticity index of the soil.
B. The soil's dry unit weight.
C. The depth of the foundation and the soil's relative density.
D. The liquid limit of the soil.
🟢C
, 🔴 RATIONALE: The bearing capacity of cohesionless soils is primarily a function of its relative density and the
depth of embedment. These factors govern the soil's ability to resist shear failure and settlement.
5. In a compacted earth fill, the moisture content is measured at a level significantly below the optimum
moisture content. What is the MOST likely outcome?
A. The fill will have a higher than required dry density.
B. The fill will be susceptible to excessive settlement and low shear strength.
C. The fill will be less permeable and more stable.
D. The fill will be easier to compact to its maximum density.
🟢B
🔴 RATIONALE: Compacted below optimum moisture content, the soil particles have insufficient water for
lubrication, leading to inadequate compaction. This results in lower dry density, a more open structure, and high
susceptibility to settlement and low shear strength when saturated.
6. The International Building Code requires that a geotechnical investigation be performed for which of the
following situations?
A. All commercial building projects.
B. Projects where the building official has reason to believe the soils are problematic.
C. Only when the project is over two stories.
D. Construction of single-family dwellings.
🟢B
