| S.No. | Field / Checkpoint | Reference | Status |
|---|---|---|---|
| A. PROJECT SETUP | |||
| A1 | Project + Survey datum + Reference BM elevation Acceptance: BM elevation traceable | TBM / GTS bench mark used | OK NC NA |
| A2 | Date + Surveyor + Instrument (auto level / digital level) Acceptance: Calibration certificate referenced | Calibrated within 6 months | OK NC NA |
| B. LEVEL BOOK COLUMNS | |||
| B1 | Station no. + description (BM / TP / details) Acceptance: All stations logged | Sequential numbering | OK NC NA |
| B2 | BS (Back Sight) + IS (Intermediate Sight) + FS (Fore Sight) readings (mm) Acceptance: Three-wire reading optional | Read to 1mm precision | OK NC NA |
| B3 | HI (Height of Instrument) = RL of BS station + BS reading Acceptance: Arithmetic checked | Computed each setup | OK NC NA |
| B4 | RL (Reduced Level) of each station = HI − IS or FS Acceptance: Two-peg test result applied | Computed | OK NC NA |
| B5 | Remarks — descriptions, weather, instrument shift Acceptance: Notes on weather, time of day | Site context | OK NC NA |
| C. CLOSURE + CHECKS | |||
| C1 | Closure check (loop back to start / known BM) Acceptance: Closure within tolerance | Closure ≤ ±5√k mm (k in km) | OK NC NA |
| C2 | Bowditch / adjustment if closure error Acceptance: Adjusted RLs computed | Distribute closing error proportional to backsight count | OK NC NA |