You are assigned to cut a precise ditch with a 2% grade for drainage. The project supervisor provides you with laser receiver readings at 10-meter intervals along the ditch line. What is the most effective method to maintain the required grade accurately?

Question: You are assigned to cut a precise ditch with a 2% grade for drainage. The project supervisor provides you with laser receiver readings at 10-meter intervals along the ditch line. What is the most effective method to maintain the required grade accurately?

Answer options:

• Estimate the slope by eye after every few bucket swings.
• Periodically check the grade with a hand-held level from the cab. ✅ Mount the laser receiver on the excavator arm and continuously monitor the grade display.
• Request a surveyor to mark the grade every 5 metres with stakes.

Correct answer: Mount the laser receiver on the excavator arm and continuously monitor the grade display.

Explanation: For precise grading like a 2% ditch, mounting a laser receiver on the excavator arm and continuously monitoring its display provides real-time feedback, allowing for accurate and consistent adherence to the specified grade. Estimating by eye or using hand-held levels are less precise and more time-consuming for long sections.