CDS Quality Control & Inspection 2 — Questions and Answers
Question 1: During a pre-demolition survey, which document must be completed before any structural work begins to verify hazardous materials status?
- Demolition work plan
- Hazardous materials assessment report (Correct answer)
- Site safety checklist
- Equipment inspection log
Correct answer: Hazardous materials assessment report
A hazardous materials assessment report must be completed before demolition to identify asbestos, lead, PCBs, and other regulated substances.
Question 2: A quality control inspector finds that a load-bearing wall scheduled for demolition was not included in the structural engineer's approved drawing. What is the correct action?
- Proceed if the wall appears non-critical
- Stop work and obtain an updated engineering review (Correct answer)
- Mark the wall and continue other demolition
- Notify OSHA immediately without stopping work
Correct answer: Stop work and obtain an updated engineering review
Any discrepancy between field conditions and approved drawings requires stopping work and obtaining an updated engineering review before proceeding.
Question 3: Which ASTM standard is most commonly referenced for evaluating the condition of existing concrete structures prior to demolition?
- ASTM C39
- ASTM E2115 (Correct answer)
- ASTM C803
- ASTM D1586
Correct answer: ASTM E2115
ASTM E2115 provides standard practice for evaluating existing building structures, relevant to pre-demolition condition assessments.
Question 4: What is the primary purpose of daily quality control logs maintained during a demolition project?
- To track worker attendance and payroll
- To document work progress, observations, and deviations from the plan (Correct answer)
- To record equipment fuel consumption
- To satisfy insurance billing requirements only
Correct answer: To document work progress, observations, and deviations from the plan
Daily QC logs document work progress, inspector observations, and any deviations from the approved demolition plan to ensure accountability.
Question 5: When inspecting a demolition site adjacent to an occupied building, which clearance measurement is most critical to verify?
- Height of the demolition debris pile
- Minimum setback distance from the adjacent structure's foundation (Correct answer)
- Distance from the site entrance to the debris zone
- Height of the perimeter fence
Correct answer: Minimum setback distance from the adjacent structure's foundation
The minimum setback from the adjacent structure's foundation is critical to prevent vibration damage, undermining, or collapse of the neighboring building.
Question 6: A CDS supervisor discovers that salvaged structural steel is mixed with debris destined for landfill disposal. What QC issue does this represent?
- A permit violation only
- Improper waste stream segregation affecting recycling compliance (Correct answer)
- An OSHA recordable incident
- A minor documentation error
Correct answer: Improper waste stream segregation affecting recycling compliance
Mixing salvaged materials with landfill debris violates waste stream segregation requirements and can result in regulatory and contractual non-compliance.
Question 7: Which inspection interval is generally required for shoring systems during a progressive demolition operation?
- Only at project start and completion
- Before each shift and after any significant event such as rain or vibration (Correct answer)
- Once per week regardless of conditions
- Only when requested by the owner's representative
Correct answer: Before each shift and after any significant event such as rain or vibration
Shoring systems must be inspected before each shift and after any event that could affect their stability, such as heavy rain, vibration, or nearby blasting.
CDS Quality Control & Inspection 2
During a pre-demolition survey, which document must be completed before any structural work begins to verify hazardous materials status?