Setting offsets from a horizontal chain line across side-slope A chain line runs horizontally in the N–S direction, while the ground slopes in the E–W direction. Regarding the setting of perpendicular offsets to details on either side, which statement is correct?

Introduction / Context:
In chain surveying, offsets are taken at right angles to the chain line to locate details. When the chain line is kept horizontal and the ground slopes transversely, field crews must still establish right angles and measure offset lengths reliably on either side of the line.

Given Data / Assumptions:

• Chain line along N–S is horizontal (stepped or supported to be level).
• Ground slopes across E–W, i.e., transverse to the chain line.
• Perpendicularity is set using an optical square or cross-staff; offset lengths can be measured horizontally (by stepping) or with slope corrections.

Concept / Approach:

Perpendiculars are directional, not dependent on ground slope. You can produce a right angle to the chain with optical aids on either side. The offset length is then measured horizontally by stepping or corrected for slope if measured along the ground. Thus, accurate offsets are feasible on both east and west sides, provided standard procedures are followed.

Step-by-Step Solution:

Verification / Alternative check:

Survey manuals describe offsetting on side-slopes using the same instruments, with only the length measurement requiring horizontal control—equally achievable on both sides.

Why Other Options Are Wrong:

Claims restricting offsets to only one side are unfounded; proper horizontality and right-angle construction are symmetrical.

“Cannot set on west side” is incorrect for the same reason.

“None” is invalid because there is a correct statement.

Common Pitfalls:

Measuring offset along the slope without reduction; failing to keep the tape horizontal; misusing the optical square on uneven footing.

Final Answer:

Offsets can be set correctly on both sides