| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. PRE-EXCAVATION SURVEY & PLANNING | |||
| A1 | Survey and setting out verified — excavation boundaries marked with pegs/paint (tolerance ±50mm plan view) Acceptance: Boundary dimensions match approved drawing ±50mm in plan | Mandatory | OK NC NA HOLD |
| A2 | Underground utilities located and marked — CALL BEFORE YOU DIG to utility authorities (electricity, water, gas, telecom, sewerage) Acceptance: Utility clearance certificate obtained and filed; no excavation within 2m of utilities without approval | Mandatory | OK NC NA HOLD |
| A3 | Excavation method statement approved in writing by site engineer / geotechnical engineer Acceptance: Method statement signed and stamped; includes excavation sequence, shoring requirement, dewatering plan | Mandatory | OK NC NA HOLD |
| A4 | Excavation drawing approved — shows depth, width, length, slope/batter angles, shoring if needed, level of founding stratum Acceptance: Drawing signed by structural & geotechnical engineers; dimensions cross-checked with site | Mandatory | OK NC NA HOLD |
| A5 | Soil type and bearing capacity assessment completed — match with geotechnical investigation bore log (IS 1498 soil classification) Acceptance: Site soil classification verified; bearing capacity per IS 6403 or geotechnical report; visual match with expected strata | Mandatory | OK NC NA HOLD |
| A6 | Water table level assessed and recorded — depth of groundwater from surface (bore log reference) Acceptance: Water table depth noted; if <1.5m below excavation bottom, dewatering plan mandatory | Mandatory | OK NC NA HOLD |
| A7 | Dewatering plan finalized if water table is high (groundwater within 1.5m of excavation bottom) — pumping capacity, sump location, disposal Acceptance: Dewatering design document approved; pump capacity ≥1.5× inflow rate; sump location clear of working area | Conditional | OK NC NA HOLD |
| A8 | Traffic management plan approved if excavation near road/public area — signage, barriers, ramps, night lighting specified Acceptance: Traffic plan document signed; road safety audit clearance obtained if near highway | Conditional | OK NC NA HOLD |
| B. EXCAVATION EXECUTION & DIMENSIONS | |||
| B1 | Excavation dimensions checked against approved drawing — length, width, depth within tolerance ±50mm plan, ±25mm depth Acceptance: Measured dimensions vs. drawing; documented in excavation log with dated survey | Mandatory | OK NC NA HOLD |
| B2 | Excavation sides cut to correct slope/batter per soil type — soft soil 1:1 (45°), medium 1:0.5, stiff clay 1:0.25 (or vertical with shoring per IS 3764 Table 1) Acceptance: Batter angle measured with clinometer or slope template; matches soil category; no slumping or collapse | Mandatory | OK NC NA HOLD |
| B3 | Shoring or sheet piling in place for deep excavation (depth >1.5m) or unstable soil — struts, soldiers, walers in position and aligned Acceptance: Shoring plan per engineer; all members aligned; no visible deformation; strut spacing per design | Conditional | OK NC NA HOLD |
| B4 | Excavation bottom level checked with dumpy level / total station — elevation recorded to nearest 25mm; level surface confirmed Acceptance: Level survey report filed; RL noted; deviation from design RL <25mm acceptable; no undulation >50mm across base | Mandatory | OK NC NA HOLD |
| B5 | No disturbance to foundation bearing stratum — excavation bottom compact, no loosening, no weaker soil exposed below target depth Acceptance: Visual inspection by geotechnical engineer; soil texture and color match expected bearing stratum; if soil is weaker than design, NCR raised | Mandatory | OK NC NA HOLD |
| B6 | Groundwater control — pumping adequate to keep excavation dry, no standing water, sump maintained Acceptance: Water level always below base of excavation by min. 500mm; pumping records maintained; no inflow exceeding pump capacity | Conditional | OK NC NA HOLD |
| B7 | Excavation equipment type verified — backhoe, dozer, dragline as per method statement; operator competency checked Acceptance: Equipment matched to soil type; operator trained and certified; daily tool-box meeting held | Mandatory | OK NC NA HOLD |
| B8 | Spoil heap management — located min. 1m away from excavation edge, height <3m, covered if near residential area Acceptance: Spoil heap distance from edge measured; no material on top of shoring; no surcharge overload on edge | Mandatory | OK NC NA HOLD |
| C. SHORING & PROTECTION | |||
| C1 | Shoring design checked — for trenches/excavations >1.5m deep, IS 3764 Cl. 6 requires shoring or safe slope per Table 1 Acceptance: Shoring design document signed by structural engineer; factor of safety ≥1.5 against failure | Conditional | OK NC NA HOLD |
| C2 | Strut spacing verified per design — typical spacing 1.0-1.5m vertically, horizontal struts aligned, no gaps Acceptance: Measured strut spacing matches design drawing within ±50mm; all struts tightened with no slack | Conditional | OK NC NA HOLD |
| C3 | Walers and soldier piles in good condition — no cracks >2mm, no deformation, proper bearing on frames Acceptance: Visual inspection; no structural defects; wood walers not rotted; steel sections not corroded/bent | Conditional | OK NC NA HOLD |
| C4 | Daily inspection of shoring system — documented in site log; any deflection >25mm flagged as NCR Acceptance: Daily inspection records maintained; deflection measured with level/straight edge; no lateral movement >25mm | Conditional | OK NC NA HOLD |
| C5 | Surcharge loads kept min. 1m away from excavation edge — no equipment, material, or spoil stacking within 1m Acceptance: Visual inspection; no surcharge within 1m zone; site kept clear of obstruction | Mandatory | OK NC NA HOLD |
| C6 | Bracing for adjacent structures — if excavation near existing building, underpinning or bracing provided per structural design Acceptance: Bracing design approved; monitoring of adjacent structure settlement <5mm per stage | Conditional | OK NC NA HOLD |