
Soil QC Field Analysis Assistant
Analyze soil test results and compaction data against construction specs
What You Can Do
You can process soil testing data (density, moisture, CBR, gradation, Atterberg limits) and field compaction measurements to verify compliance with construction specifications. The skill helps you identify non-compliant conditions early, determine when additional testing is required, and produce documented QC reports that withstand owner and contractor scrutiny. You'll work through structured analysis workflows that catch compliance gaps and create defensible decision trails.
Features
Compare density, moisture, CBR, and gradation results against specification baselines and standard/modified proctor requirements
Evaluate field density test data (nuclear gauge, sand cone, drive cylinder) against target specifications and flag non-compliance
Identify missing data, insufficient test frequency, or spatial distribution issues that require corrective action
Systematically decide when test failures warrant re-testing, rework, or acceptance with documentation
Produce structured daily/weekly reports with data justification, trend analysis, and audit-trail documentation
Assess whether tested soil meets bearing capacity, permeability, and stability requirements for intended use
Maintain documented evidence of proper test spacing and sampling distribution across fill areas
Example Output
Example 1: Compaction Non-Compliance Report
- Fill Section A, Test Location 3: Density 94.2% vs. 95% minimum required → REJECT pending rework
- Recommended action: Scarify 6 inches, re-compact, re-test within 2 hours
- Evidence: Nuclear gauge calibration check dated, test point GPS coordinates logged
Example 2: Moisture Content Assessment
- Subgrade moisture: 8.3% vs. 7.5–9.0% specification range → ACCEPT
- CBR test result: 12.5 vs. 10 minimum → Exceeds requirement
- Recommendation: Continue testing at current frequency (every 500 cubic yards)
Example 3: Weekly QC Summary
- Total tests performed: 18 (7 density, 5 moisture, 4 gradation, 2 CBR)
- Compliance rate: 94% (17/18 pass)
- Non-compliant item: Section B, Test 5 (rework in progress)
- Next steps: Retest after compaction completion
What's Included
- SKILL.md: Core analysis workflow and competency framework
- Soil Test Interpretation Checklist: Verification steps for density, moisture, CBR, and gradation against specifications
- Compaction Compliance Template: Structured form for documenting field density results and pass/fail decisions
- Daily QC Report Template: Pre-formatted report structure with data fields, trend section, and corrective action tracking
- Test Frequency & Location Matrix: Grid for tracking test spatial distribution and compliance with sampling plan requirements
- Corrective Action Decision Tree: Logic flow for determining re-test, rework, or acceptance actions based on test results
Who It's For
- QC Inspectors & Field Supervisors — Daily soil compliance verification and defect identification
- Construction Quality Managers — Weekly/monthly report aggregation and compliance trending
- Site Engineers — Documentation preparation for owner meetings and progress certification
- Earthwork Contractors — Response planning to non-compliance notices and corrective action justification
- Geotechnical Project Managers — Oversight of field testing protocols and compliance documentation trails
Best For
- Verifying soil density and moisture compliance on fills, subgrades, and base courses
- Processing and interpreting field test reports (nuclear gauge, sand cone, drive cylinder results)
- Generating defensible QC documentation with audit-trail evidence for owner/contractor disputes
- Identifying when additional testing is required based on specification gaps
- Creating daily/weekly compaction and soil suitability trend reports







