When establishing a benchmark for site surveying, what is the minimum distance the benchmark should be located from the construction area?
Correct Answer
D) 100 feet
Benchmarks should be established at least 100 feet from the construction area to ensure they remain undisturbed during construction activities. This distance provides adequate protection from heavy equipment and excavation work.
Why This Is the Correct Answer
The 100-foot minimum distance requirement for benchmarks ensures they remain stable and undisturbed throughout the construction process. This distance provides adequate clearance from heavy equipment operations, excavation activities, material storage areas, and temporary construction facilities. Benchmarks serve as critical reference points for elevation and horizontal control, so their integrity must be maintained. The 100-foot buffer zone is an industry standard that balances accessibility for surveying needs while protecting against construction-related disturbances.
Why the Other Options Are Wrong
Option A: 25 feet
25 feet is insufficient distance to protect benchmarks from construction activities. Heavy equipment, material deliveries, and excavation work can easily extend beyond this distance and potentially disturb or damage the benchmark.
Option B: 50 feet
50 feet, while better than 25 feet, is still too close to the active construction zone. Modern construction equipment and staging areas often require more space, making this distance inadequate for benchmark protection.
Option C: 75 feet
75 feet provides better protection than shorter distances but still falls short of the required minimum. Construction sites often have equipment and activities that extend beyond this range, potentially compromising benchmark stability.
Memory Technique
Think '100 feet = 100% protection' - the benchmark needs complete protection from all construction activities to maintain its accuracy and usefulness throughout the project.
Reference Hint
Look up surveying and site layout sections in construction management references, typically found in chapters covering site preparation and surveying standards.
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