| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. CHAMBER CONSTRUCTION | |||
| A1 | Manhole pit excavated to design depth and diameter (typical 1.0-1.2m internal diameter) Acceptance: Internal diameter ≥1.0m, depth to invert per design, bottom firm | Cl. 5.1 — Pit dimensions | |
| A2 | RCC slab or brick lining constructed; circular/rectangular shape as per design Acceptance: RCC 150mm thick or brick 230mm, inside smooth, no cracks, watertight seal | Cl. 5.2 — Lining material | |
| A3 | Chamber properly waterproofed; joints sealed, no seepage when water level rises Acceptance: Internal surface sealed with bitumen/cement slurry, no water weeping after curing | Cl. 5.3 — Waterproofing | |
| B. PIPE CONNECTIONS | |||
| B1 | Incoming and outgoing pipes at correct invert levels with proper drop (min. 50mm at bends) Acceptance: Invert drop measured, drop ≥50mm at junction, allows gravity flow | Cl. 6.1 — Invert level | |
| B2 | Benching provided: sloped concrete floor guiding flow from inlet to outlet (1:4 slope typical) Acceptance: Bench slope 1:4, smooth concrete surface, no pooling of water at inlet | Cl. 6.2 — Benching | |
| B3 | Pipe entries sealed with mortar at junction with chamber wall (no gaps around spigot) Acceptance: Mortar joint 1:2 cement:sand, completely filled around pipe, no visible gaps | Cl. 6.3 — Pipe sealing | |
| C. STEPS & ACCESS | |||
| C1 | Step irons or cast iron steps embedded in wall at 300mm intervals for ladder access Acceptance: Steps at 300mm intervals, secure, non-slippery surface, load-tested 100kg | Cl. 7.1 — Step irons | |
| C2 | Top access opening has frame and cover (cast iron grating typical), not less than 0.6m × 0.6m clear opening Acceptance: Clear opening ≥0.6m × 0.6m, cover fits snugly, removable for inspection | Cl. 7.2 — Access opening | |