You are tasked with grading a new building pad to a precise elevation with a maximum deviation of ±10 mm. The site supervisor has provided grade stakes every 5 m across the pad. Which technique will best achieve the required accuracy?

Question: You are tasked with grading a new building pad to a precise elevation with a maximum deviation of ±10 mm. The site supervisor has provided grade stakes every 5 m across the pad. Which technique will best achieve the required accuracy?

Answer options: ✅ Using a laser level system integrated with the excavator's hydraulics

• Relying solely on visual estimation of the grade stakes
• Periodically checking the grade with a handheld rod and builder's level
• Operating the bucket teeth only, maintaining a consistent cutting depth

Correct answer: Using a laser level system integrated with the excavator's hydraulics

Explanation: A laser level system integrated with the excavator's hydraulics provides continuous, real-time feedback, allowing for very precise grade control necessary to achieve a tight tolerance of ±10 mm. Visual estimation and periodic manual checks are less precise and more time-consuming for such fine grading. Using only bucket teeth without grade reference is highly inaccurate.