Question

Sequentially arrange the steps involved in laying a sewer line: 

A. Transferring the center line of the sewer to the bottom of the trench. 
B. Setting sight rails over the trench. 
C. Driving pegs to the level of the invert line of the sewer. 
D. Placing the sewer in the trench. 
Choose the most appropriate answer from the options given below:

• A. A, B, C and D
• B. B, C, D and A
• C. B, D, C and A
• D. B, C, A and D

Hint:

In sewer construction, sight rails and pegs provide alignment and level before the actual placement of the sewer.

Answer 1

The Correct Option is D

Step 1: Sight Rail Establishment.
Establish reference sight rails above the trench (B).

Step 2: Peg Driving.
Drive pegs to the invert line level of the sewer (C).

Step 3: Center Line Transfer.
Transfer the sewer's center line to the trench bottom (A).

Step 4: Sewer Placement.
Place the sewer in the trench (D).

Step 5: Final Order.
The correct sequence is B → C → A → D. The answer is (D).