| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. CPT EQUIPMENT AND CALIBRATION | |||
| A1 | Cone penetrometer calibration and certification Acceptance: Equipment calibrated within 6 months; cone area verified; friction sleeve area confirmed | Cl. 3.1 — Equipment accuracy | |
| A2 | Load cell verification and zero check Acceptance: Load cells tested; zero reading verified; calibration certificate available; drift ≤ 2% | Cl. 3.2 — Measurement accuracy | |
| A3 | Penetration rate and procedure Acceptance: Rate = 20 ± 5 mm/sec per IS; continuous penetration; no pauses; recorded with time | Cl. 3.3 — Test standardization | |
| B. CPT MEASUREMENTS AND DATA COLLECTION | |||
| B1 | Cone resistance (qc) measurement Acceptance: Measured at 0.1 m intervals; averaged over 0.2 m; unit: MPa or kPa; recorded digitally | Cl. 4.1 — Tip resistance | |
| B2 | Sleeve friction (fs) measurement Acceptance: Measured continuously; unit: kPa; friction ratio (Rf) calculated; checked for anomalies | Cl. 4.2 — Shaft friction | |
| B3 | Excess pore pressure (u) measurement (Piezocone) Acceptance: Pore pressure measured at cone tip; saturated clay shows excess pressure; dissipation test if required | Cl. 4.3 — Pore pressure response | |
| B4 | Data quality and signal integrity Acceptance: Data downloaded from penetrometer; no signal loss; gaps identified; spikes checked and removed | Cl. 4.4 — Data validation | |
| C. SOIL CLASSIFICATION AND INTERPRETATION | |||
| C1 | Soil type identification from CPT data Acceptance: Soil type chart applied; classification zones identified; soil behavior type (SBT) determined | Cl. 5.1 — Classification per charts | |
| C2 | Layer identification and boundaries Acceptance: Transitions between layers marked; layer thickness measured; comparison with borehole log | Cl. 5.2 — Stratum determination | |
| C3 | Relative density (for granular soils) Acceptance: Relative density calculated from qc; loose/medium/dense ranges identified; correlated with SPT N | Cl. 5.3 — Sand density assessment | |