{
  "metadata": {
    "source_file": "/Users/tom/Desktop/project/vinci/geotech/geotech-azure/examples/sample_pdfs/5.pdf",
    "extraction_date": "2025-07-30T18:48:56.422438",
    "extraction_method": "Azure Document Intelligence + GPT-3.5",
    "pages": 2,
    "layer_count": 9,
    "extraction_time_seconds": 16.26
  },
  "layers": [
    {
      "page": 1,
      "depth_start": 0.0,
      "depth_end": 0.3,
      "description": "Silty CLAY with some rootlets; brown. Firm, moist, high plasticity (TOPSOIL)."
    },
    {
      "page": 1,
      "depth_start": 0.3,
      "depth_end": 1.5,
      "description": "Silty CLAY; light brown mottled orange. Firm, moist, high plasticity."
    },
    {
      "page": 1,
      "depth_start": 1.5,
      "depth_end": 2.9,
      "description": "Sandy SILT with some carbonaceous intrusions; light grey streaked orange. Stiff to very stiff, moist, low plasticity; sand, fine to coarse (Completely degraded NORTHLAND ALLOCHTHON GRADE 5)."
    },
    {
      "page": 1,
      "depth_start": 2.9,
      "depth_end": 3.0,
      "description": "Highly degraded, light grey streaked orange, massive LIMESTONE; extremely weak, recovered as Sandy SILT; Very stiff, moist, low plasticity (NORTHLAND ALLOCHTHON GRADE 4)."
    },
    {
      "page": 1,
      "depth_start": 3.0,
      "depth_end": 5.5,
      "description": "Moderately degraded, light bluish grey, massive LIMESTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided. (NORTHLAND ALLOCHTHON GRADE 3)."
    },
    {
      "page": 1,
      "depth_start": 5.5,
      "depth_end": 5.8,
      "description": "Highly degraded, light bluish grey, massive LIMESTONE; extremely weak, recovered as Sandy SILT; Very stiff, moist, low plasticity (NORTHLAND ALLOCHTHON GRADE 4)."
    },
    {
      "page": 1,
      "depth_start": 5.8,
      "depth_end": 6.39,
      "description": "Moderately degraded, light bluish grey, massive LIMESTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided. (NORTHLAND ALLOCHTHON GRADE 3)."
    },
    {
      "page": 1,
      "depth_start": 6.39,
      "depth_end": 7.05,
      "description": "Highly degraded, light bluish grey, massive LIMESTONE; extremely weak, recovered as Silty fine to coarse SAND with some minor fine gravel; Medium Dense to Dense, wet, poorly graded (NORTHLAND ALLOCHTHON GRADE 4)."
    },
    {
      "page": 1,
      "depth_start": 7.05,
      "depth_end": 7.8,
      "description": "Highly degraded, light grey, massive LIMESTONE; extremely weak, recovered as Sandy SILT; Very stiff, moist, low plasticity (NORTHLAND ALLOCHTHON GRADE 4)."
    },
    {
      "page": 1,
      "depth_start": 7.8,
      "depth_end": 9.7,
      "description": "Moderately degraded, grey, thinly bedded MUDSTONE; extremely weak to very weak; bedding is moderately inclined. Highly micro-fractured, sheared and slickensided. (NORTHLAND ALLOCHTHON GRADE 3)."
    },
    {
      "page": 2,
      "depth_start": 9.7,
      "depth_end": 11.7,
      "description": "Slightly degraded, bluish grey, massive LIMESTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided. (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 2,
      "depth_start": 11.7,
      "depth_end": 15.8,
      "description": "Slightly weathered, grey, moderately thickly bedded, fine SANDSTONE; weak with thinly interbedded dark grey SILTSTONE; very weak. Bedding is steeply inclined."
    },
    {
      "page": 2,
      "depth_start": 15.8,
      "depth_end": 17.4,
      "description": "Slightly degraded, bluish grey, massive LIMESTONE; extremely weak. Highly"
    },
    {
      "page": 3,
      "depth_start": 17.4,
      "depth_end": 18.0,
      "description": "Slightly degraded, dark grey, massive MUDSTONE; weak with some fine to coarse gravel sized, subrounded limestone clasts. Highly microfractured and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 3,
      "depth_start": 18.0,
      "depth_end": 21.3,
      "description": "Slightly degraded, interbedded, dark grey MUDSTONE and bluish grey LIMESTONE; extremely weak. Highly microfractured and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 3,
      "depth_start": 21.3,
      "depth_end": 22.75,
      "description": "Slighty degraded, light grey MUDSTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 3,
      "depth_start": 22.75,
      "depth_end": 23.4,
      "description": "Slightly degraded, bluish grey, massive LIMESTONE; extremely weak. Highly microfractured and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 3,
      "depth_start": 23.4,
      "depth_end": 23.7,
      "description": "Slighty degraded, light grey MUDSTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 3,
      "depth_start": 23.7,
      "depth_end": 24.45,
      "description": "Slightly degraded, bluish grey, massive LIMESTONE; extremely weak. Highly microfractured and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    },
    {
      "page": 4,
      "depth_start": 24.45,
      "depth_end": 30.0,
      "description": "Slighty degraded, light grey MUDSTONE; extremely weak to very weak. Highly micro-fractured, sheared and slickensided (NORTHLAND ALLOCHTHON GRADE 2)."
    }
  ]
}