When establishing a benchmark for site surveying, which characteristic is most important?
Correct Answer
A) It must be a permanent, stable reference point
A benchmark must be a permanent, stable reference point that will not move during construction. It serves as the elevation reference for all surveying work and must maintain its position and elevation throughout the project.
Why This Is the Correct Answer
A benchmark must be a permanent, stable reference point because it serves as the fundamental elevation datum for all surveying activities throughout the construction project. Any movement or instability would compromise the accuracy of all subsequent measurements, elevations, and grade work. The benchmark's permanence ensures consistent reference points for layout, excavation depths, foundation elevations, and final grading. Without stability, surveying errors would compound throughout the project, potentially causing costly construction mistakes and code violations.
Why the Other Options Are Wrong
Option B: It should be located at the highest point on the site
The highest point on a site is not necessarily the best benchmark location. Benchmarks should be established at convenient, accessible locations that provide good sight lines for surveying instruments. The highest point may be unstable, difficult to access, or subject to disturbance during construction activities. Elevation can be transferred from any stable reference point regardless of its relative height on the site.
Option C: It should be positioned at the center of the construction area
Positioning a benchmark at the center of the construction area would likely result in its destruction or disturbance during excavation, foundation work, or other construction activities. Benchmarks should be located outside the immediate work zone in protected areas where they won't be damaged by construction equipment, material storage, or site operations while remaining accessible for surveying work.
Option D: It must be visible from all areas of the site
While visibility is helpful for surveying efficiency, it's not the most critical characteristic of a benchmark. Modern surveying instruments and techniques can work around visibility limitations through intermediate points and traverse methods. The fundamental requirement is permanence and stability - a benchmark that moves defeats its purpose regardless of how visible it may be from various site locations.
Memory Technique
Remember 'PERMANENT BENCHMARK' - the key is in the name. A benchmark must be permanent and stable above all else, just like a reliable friend who never moves or changes.
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass