15/06/2026
Geotechnical Report Content as per NSCP 2015
1. Site Exploration Plan
• Plot showing all test borings (SPT, CPT, auger, rotary wash) and in-situ tests (CPT, DCP, vane shear, PMT, plate load)
• Trial pits/excavations
• Locations of structures, utilities, site features
• Ground elevations, benchmarks, and coordinates/gridlines for exploration points
🪨 2. Subsurface Materials & Classification
• Soil/rock layers with USCS classification
• Key index properties (Atterberg limits, grain size, moisture content)
• Visual/manual notes
• Identification of fill, natural soils, problematic soils (e.g., expansive, soft clays), and bedrock/weathered rock
💧 3. Groundwater Conditions
• Water table elevation (if found) and measurement method
• Observed seepage or perched water
• Seasonal variation expectations
• Impact on excavation, stability, and foundation design
🏗️ 4. Foundation Recommendations & Design Criteria
4.1 Recommended Foundation Type
• Shallow foundations (spread footings, mat foundations)
• Deep foundations (driven piles, bored piles, Micropiles)
• Ground improvement options (if required)
4.2 Bearing Capacity
• Allowable bearing pressures
• Basis of evaluation (SPT N, CPT qc, lab tests, correlations)
• Shear controlled vs settlement-controlled capacities
4.3 Differential Settlement Mitigation
• Footing sizing and proportioning
• Raft foundation considerations
• Preloading, surcharging, or staged construction
• Avoidance of abrupt layer transitions
4.4 Liquefaction & Strength Loss
• Liquefaction triggering analysis
• Factor of safety against liquefaction
• Recommended mitigation:
• Densification
• Stone columns
• Deep soil mixing
• Pile foundations bypassing liquefiable layers
4.5 Special Foundation Solutions
• Underpinning
• Retaining structures
• Excavation support systems
• Dewatering requirements
4.6 Effects on Adjacent Structures
• Predicted ground movements
• Vibration impacts (pile driving, compaction)
• Protection measures for nearby buildings and utilities
📉 5. Estimated Total and Differential Settlement
• Immediate settlement
• Consolidation settlement
• Secondary compression (if applicable)
• Differential settlement across footings or mat foundations
• Time rate of settlement (t50, t90)
🧪 6. Laboratory Test Results
• Moisture content
• Atterberg limits
• Grain size distribution
• Unit weight
• Consolidation test results
• Direct shear / triaxial test results
• Unconfined compression (if applicable)
• Chemical tests (sulfates, chlorides, pH) when relevant
📝 7. Field Borehole Logs
• Drilling method and equipment
• Depth wise soil description
• SPT N values (with corrections if applicable)
• Groundwater observations
• Sampling intervals and sample types
• Rock core recovery (RQD, % recovery)
• Notes on refusal, obstructions, or anomalies
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