{
  "format": "bridge-evidence/0.1",
  "id": "kai-iwi",
  "name": "Kai Iwi Stream Bridge",
  "structure_id": 33053,
  "coordinates": "metres; X A to D; Y up from local RL 140 ft; Z right",
  "scope": "Drawing-derived nominal exterior geometry and evidence-linked element quantities",
  "extraction": {
    "method": "curated source transcription",
    "ground_truth_used": false,
    "prior_exposure": "Workbook row counts and schema inspected before reconstruction; no Kai Iwi answer rows used to construct geometry."
  },
  "sources": [
    {
      "id": "source-kai-iwi",
      "file": "33053 - Kai Iwi Stream Bridge - SH3_3840_Original Construction Drawing_1961.pdf",
      "sha256": "720ecfc2442029920148c05823fc9c075ac43be2396f2ababdf08170a99f2cee",
      "pages": 8
    }
  ],
  "sheets": [
    {
      "id": "sheet-1",
      "source": "source-kai-iwi",
      "page": 1,
      "title": "General layout",
      "drawing": "MOW 2273 / 1",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-1.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-2",
      "source": "source-kai-iwi",
      "page": 2,
      "title": "Details of abutments",
      "drawing": "MOW 2273 / 2",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-2.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-3",
      "source": "source-kai-iwi",
      "page": 3,
      "title": "Details of piers",
      "drawing": "MOW 2273 / 3",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-3.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-4",
      "source": "source-kai-iwi",
      "page": 4,
      "title": "Deck details",
      "drawing": "MOW 2273 / 4",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-4.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-5",
      "source": "source-kai-iwi",
      "page": 5,
      "title": "Handrail details",
      "drawing": "MOW 2273 / 5",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-5.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-6",
      "source": "source-kai-iwi",
      "page": 6,
      "title": "Reinforcing schedule",
      "drawing": "MOW 2273 / 6",
      "revision": "Issue A / as-built stamp",
      "image": "assets/sheet-6.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-7",
      "source": "source-kai-iwi",
      "page": 7,
      "title": "Amendment to base of Pier C",
      "drawing": "WGR 1593",
      "revision": "As supplied; revision reconciliation recorded separately",
      "image": "assets/sheet-7.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    },
    {
      "id": "sheet-8",
      "source": "source-kai-iwi",
      "page": 8,
      "title": "Standard precast pretensioned I beam, 55 ft span",
      "drawing": "PWD 155935",
      "revision": "As supplied; revision reconciliation recorded separately",
      "image": "assets/sheet-8.jpg",
      "width_pt": 1190.6400146484375,
      "height_pt": 841.9190063476562,
      "source_word_count": 0
    }
  ],
  "observations": [
    {
      "id": "span-layout",
      "sheet": "sheet-1",
      "bbox": [
        0.16,
        0.08,
        0.59,
        0.18
      ],
      "text": "A-B 55 ft 6 5/8 in; B-C 56 ft 1 1/4 in; C-D 55 ft 6 5/8 in; backs 1 ft 2 in beyond end axes",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "length-check",
      "sheet": "sheet-5",
      "bbox": [
        0.08,
        0.04,
        0.95,
        0.18
      ],
      "text": "169 ft 6 1/2 in overall handrail layout",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "section-layout",
      "sheet": "sheet-4",
      "bbox": [
        0.065,
        0.64,
        0.51,
        0.83
      ],
      "text": "4 ft 11 in footpath zone + 12 ft + 12 ft carriageway + 1 ft 9 in kerb zone; road centre 1 ft 5 in right of bridge centre; crossfall 1 in 72; 6 in deck; 1 in pop at supports",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "width-check",
      "sheet": "sheet-1",
      "bbox": [
        0.64,
        0.55,
        0.94,
        0.87
      ],
      "text": "Overall width 30 ft 8 in; 8 beams per span; 5 ft diameter column",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "beam-spacing",
      "sheet": "sheet-4",
      "bbox": [
        0.2,
        0.7,
        0.49,
        0.84
      ],
      "text": "Eight standard precast beams at 3 ft 3 in centres; centre pair 1 ft 7 1/2 in either side of bridge centre; bearings 11 in by 6 in by 1/2 in",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "bearing-pad-detail",
      "sheet": "sheet-4",
      "bbox": [
        0.04,
        0.75,
        0.3,
        0.81
      ],
      "text": "11 in x 6 in x 1/2 in thick Neoprene or other approved bearing pads, placed symmetrically about centres of dowels under each beam. Transverse section independently dimensions the 11 in width.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "deck-level-fit",
      "sheet": "sheet-1",
      "bbox": [
        0.175,
        0.345,
        0.57,
        0.404
      ],
      "text": "Road centre deck RL at x=0:202.22 ft; x=81 ft 7 7/8 in:200.58 ft; x=161 ft 7 7/8 in:199.63 ft. Fit quadratic through these three tabulated values; second station series is measured back from Pier C at 111 ft 7 7/8 in, not from A.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "deck-level-check",
      "sheet": "sheet-1",
      "bbox": [
        0.2,
        0.345,
        0.57,
        0.405
      ],
      "text": "Independent deck RLs: x=10:201.99;20:201.76;30:201.54;40:201.32;50:201.14;61.65625:200.92;71.65625:200.74;91.65625:200.42;101.65625:200.28;111.65625:200.15;121.65625:200.02;131.65625:199.91;141.65625:199.81;151.65625:199.71; D:199.59 (feet)",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "vertical-curve-check",
      "sheet": "sheet-1",
      "bbox": [
        0.04,
        0.45,
        0.64,
        0.49
      ],
      "text": "12 chains sag vertical curve; entering tangent -3.91 ft per chain and exiting tangent +1.45 ft per chain. One chain is 66 ft. Curvature check only: no elevation datum or tangent-point origin inferred.",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "beam-section",
      "sheet": "sheet-8",
      "bbox": [
        0.4,
        0.38,
        0.56,
        0.69
      ],
      "text": "Section C-C: 3 ft deep; top flange 3 in + 6 in + 3 in; 6 in web; 1 ft bottom flange; 5 in exterior top flange, 2 in upper taper; 1 ft 5 in straight web; hatched bottom block 6 in plus 4 in taper; a separate unhatched 2 in region below it requires reconciliation with the elevation note Slope 2 in up. Do not treat that region as confirmed concrete. The separate 4 in dimension locates the GWI pipe, not the flange underside",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "beam-concrete-quantity-check",
      "sheet": "sheet-8",
      "bbox": [
        0.735,
        0.68,
        0.96,
        0.725
      ],
      "text": "Quantities per beam: Concrete 118.5 cubic feet. Compare only after reconciling standard inner/outer beam applicability, end blocks, stubs, holes and chamfers; not an inventory answer workbook.",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "beam-length",
      "sheet": "sheet-8",
      "bbox": [
        0.71,
        0.25,
        0.95,
        0.43
      ],
      "text": "Overall precast beam 55 ft 6 1/2 in including 1/2 in casting allowance; nominal bearing span 55 ft",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "bearing-offset",
      "sheet": "sheet-3",
      "bbox": [
        0.66,
        0.045,
        0.76,
        0.16
      ],
      "text": "Pier bearing/dowel lines 6 5/8 in each side of pier axis; cap longitudinal width 2 ft 6 in",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "slab-length-check",
      "sheet": "sheet-4",
      "bbox": [
        0.1,
        0.425,
        0.61,
        0.62
      ],
      "text": "Three deck segments 56 ft 0 1/2 in; 3/4 in transverse joints",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "deck-overhang",
      "sheet": "sheet-4",
      "bbox": [
        0.065,
        0.425,
        0.61,
        0.62
      ],
      "text": "Slab extends 3 in past beam at each end; 3/4 in joints; 12 in plus 9 3/4 in abutment-end reinforcing dimension chain",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-cap",
      "sheet": "sheet-3",
      "bbox": [
        0.24,
        0.045,
        0.61,
        0.29
      ],
      "text": "Pier cap overall width corrected in handwriting from 25 ft 6 in to 25 ft 10 in; longitudinal width 2 ft 6 in; centre bottom RL B=192.17, C=191.29; underside rises 2 ft 3 in to ends",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-cap-longitudinal-fall",
      "sheet": "sheet-3",
      "bbox": [
        0.66,
        0.045,
        0.83,
        0.205
      ],
      "text": "View B-B: cap is 2 ft 6 in longitudinally, with 1/2 in fall at Pier B towards B-C and 3/8 in at Pier C towards C-D. Plan labels RLs at pier centreline; anchor these at X equal to the pier axis.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-levels",
      "sheet": "sheet-3",
      "bbox": [
        0.045,
        0.11,
        0.23,
        0.61
      ],
      "text": "Top of cap left reference: B 197.60 ft, C 196.72 ft; right reference B 197.25 ft, C 196.37 ft; nominal reference offsets +/-12 ft 9 in",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-columns",
      "sheet": "sheet-3",
      "bbox": [
        0.36,
        0.335,
        0.63,
        0.62
      ],
      "text": "4 ft 6 in internal RC pipe; general layout specifies 5 ft external columns; column bases B RL172.17, C RL171.29",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "column-diameter",
      "sheet": "sheet-1",
      "bbox": [
        0.72,
        0.755,
        0.91,
        0.87
      ],
      "text": "5 ft 0 in diameter columns",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "column-height-check",
      "sheet": "sheet-3",
      "bbox": [
        0.295,
        0.31,
        0.39,
        0.61
      ],
      "text": "Column stem height 20 ft 0 in",
      "role": "check",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-b-foundation",
      "sheet": "sheet-3",
      "bbox": [
        0.075,
        0.64,
        0.265,
        0.87
      ],
      "text": "Base shaft 5 ft 6 in by 7 ft 0 in; footing minimum 8 ft 6 in by 10 ft 0 in; 40 degrees to bridge centreline; base bottom B RL157.00; footing minimum thickness 2 ft 6 in",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "pier-c-amendment",
      "sheet": "sheet-7",
      "bbox": [
        0.04,
        0.04,
        0.96,
        0.965
      ],
      "text": "WGR1593 replaces Pier C base detail: RL171.29 top; papa RL156.00; bottom RL148.00; 10 ft by 8 ft 6 in footprint; caisson and additional reinforcing. To be read with MOW2273 sheet 3 issue A.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-caps",
      "sheet": "sheet-2",
      "bbox": [
        0.07,
        0.055,
        0.94,
        0.26
      ],
      "text": "Abutment cap/wing outline total 40 ft 6 in; central seat 28 ft; left and right wing returns; 2 ft 6 in longitudinal seat width",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-foundations",
      "sheet": "sheet-2",
      "bbox": [
        0.075,
        0.25,
        0.94,
        0.87
      ],
      "text": "Two cylinders per abutment at 16 ft 6 in centres; 4 ft 6 in INTERNAL diameter; pipe length determined after foundation inspection; 7 ft minimum footings. External cylinder diameter not explicitly dimensioned here.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-section",
      "sheet": "sheet-2",
      "bbox": [
        0.54,
        0.65,
        0.93,
        0.87
      ],
      "text": "Abutment A/D stepped backwall and bearing-seat sections differ. Exterior section needs complete tracing before compilation.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-inner-face-levels",
      "sheet": "sheet-2",
      "bbox": [
        0.075,
        0.07,
        0.47,
        0.16
      ],
      "text": "Abutment A upper RLs 202.05, 202.24 and 202.47 ft are starred: levels shown inner face. They must not be used as dowel-axis levels without resolving longitudinal reference and grade. This reference is not yet used to modify bearing-seat geometry.",
      "role": "context",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-seat-section",
      "sheet": "sheet-2",
      "bbox": [
        0.53,
        0.665,
        0.91,
        0.88
      ],
      "text": "Lower central seat block: 3 ft 6 in depth; longitudinal chain 1 ft 0 in + 1 ft 9 in = 2 ft 9 in. Dowel/cylinder axis is 1 ft 7 in from rear edge and 1 ft 2 in from span-side edge; A and D are mirrored. Upper stepped backwall is separate.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "abutment-seat-levels",
      "sheet": "sheet-2",
      "bbox": [
        0.075,
        0.065,
        0.945,
        0.275
      ],
      "text": "Central block 28 ft wide. A underside RLs 195.33 ft at global left and 194.94 ft at global right; D 192.67 left and 192.28 right. A elevation faces opposite to global transverse direction.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-layout",
      "sheet": "sheet-5",
      "bbox": [
        0.075,
        0.05,
        0.95,
        0.185
      ],
      "text": "Steel posts at 10 ft centres; first and last regular posts 7 ft from end post; end offsets 2 ft 9 1/4 in",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-section",
      "sheet": "sheet-5",
      "bbox": [
        0.095,
        0.21,
        0.935,
        0.715
      ],
      "text": "Steel top rail and vertical bar panels; 3 ft clear height above footpath / kerb; post mark and panel schedules vary along bridge",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-panel-schedule",
      "sheet": "sheet-5",
      "bbox": [
        0.365,
        0.53,
        0.455,
        0.655
      ],
      "text": "Panel marks A/G: 6 ft 10 1/2 in with 13 bars; B-F: 9 ft 10 1/2 in with 19 bars. Total counts A2 B8 C4 D4 E8 F6 G2. Drop X: A 1 7/8, B 2 3/4, C 2 1/4, D 1 3/4, E 1 1/2, F 1 1/4, G 5/8 inches.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-elevation-marks",
      "sheet": "sheet-5",
      "bbox": [
        0.085,
        0.06,
        0.94,
        0.175
      ],
      "text": "Downstream elevation from A to D: panels A B B B C B C D D E E E E F F F G; 16 intermediate posts per side. Seven-foot end bays and fifteen ten-foot interior bays; both end offsets 2 ft 9 1/4 in inside the 169 ft 6 1/2 in overall dimension.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-panel-member-section",
      "sheet": "sheet-5",
      "bbox": [
        0.095,
        0.515,
        0.44,
        0.69
      ],
      "text": "Panel detail: 3/4 in diameter bars at 6 in centres, first and last centres 5 1/4 in from ends; upper and lower members out of 2 in x 1/2 in mild-steel flat; overall panel height 2 ft 3 1/2 in. Centre bar projects below the bottom flat; bolt holes and connection plates shown separately.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-post-schedule",
      "sheet": "sheet-5",
      "bbox": [
        0.91,
        0.385,
        0.96,
        0.485
      ],
      "text": "Post quantities across both sides: mark 1 eight, 2 four, 3 six, 4 four, 5 six, 6 four; X 45,45,65,65,90,90 degrees respectively.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "rail-height",
      "sheet": "sheet-1",
      "bbox": [
        0.64,
        0.565,
        0.94,
        0.71
      ],
      "text": "Rail top 3 ft above local footpath or kerb top; kerb 9 in above carriageway",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "kerb-section",
      "sheet": "sheet-4",
      "bbox": [
        0.675,
        0.24,
        0.97,
        0.42
      ],
      "text": "Right kerb zone 1 ft 9 in, outer nib 6 in; footpath left zone 4 ft 11 in; 9 in rise at road edge. Detailed lips, voids and ducts shown.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "diaphragms",
      "sheet": "sheet-4",
      "bbox": [
        0.08,
        0.04,
        0.67,
        0.405
      ],
      "text": "Plan labels: 6 in wide diaphragms at 10 ft centres; separate 12 in wide diaphragms and handrail posts at 10 ft centres, with a 5 ft offset shown between series. Exact station origins, transverse roles and precast-stub versus infill boundaries remain unresolved. Nearby reinforcing end chains do not define diaphragm widths.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "beam-diaphragm-stations",
      "sheet": "sheet-8",
      "bbox": [
        0.06,
        0.02,
        0.84,
        0.34
      ],
      "text": "Half elevation of inner beam: end to first diaphragm centre 13 ft 9 1/4 in; first to middle diaphragm centre 14 ft 0 in; symmetric about middle beam/diaphragm axis. Three intermediate stations. These are distinct from the sheet-4 ten-foot plan series.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    },
    {
      "id": "approaches",
      "sheet": "sheet-1",
      "bbox": [
        0.07,
        0.13,
        0.66,
        0.51
      ],
      "text": "Approach formation and terrain shown schematically; current surfacing, barriers and signs not measured in this source set.",
      "role": "construction",
      "review": "unreviewed",
      "method": "visual transcription of source pixels"
    }
  ],
  "parameters": [
    {
      "id": "span-ab",
      "value": 16.932275,
      "unit": "m",
      "status": "observed",
      "reading": "55 ft 6.625 in",
      "evidence": [
        "span-layout"
      ],
      "dependencies": []
    },
    {
      "id": "span-bc",
      "value": 17.100550000000002,
      "unit": "m",
      "status": "observed",
      "reading": "56 ft 1.25 in",
      "evidence": [
        "span-layout"
      ],
      "dependencies": []
    },
    {
      "id": "span-cd",
      "value": 16.932275,
      "unit": "m",
      "status": "observed",
      "reading": "55 ft 6.625 in",
      "evidence": [
        "span-layout"
      ],
      "dependencies": []
    },
    {
      "id": "back-offset",
      "value": 0.3556,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 2 in",
      "evidence": [
        "span-layout"
      ],
      "dependencies": []
    },
    {
      "id": "length",
      "value": 51.676300000000005,
      "unit": "m",
      "status": "derived",
      "reading": "Sum of support spans + both back offsets",
      "evidence": [],
      "dependencies": [
        "span-ab",
        "span-bc",
        "span-cd",
        "back-offset"
      ]
    },
    {
      "id": "road-width",
      "value": 7.315200000000001,
      "unit": "m",
      "status": "observed",
      "reading": "24 ft 0 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "footpath-zone",
      "value": 1.4986000000000002,
      "unit": "m",
      "status": "observed",
      "reading": "4 ft 11 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "kerb-zone",
      "value": 0.5334,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 9 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "deck-width",
      "value": 9.3472,
      "unit": "m",
      "status": "derived",
      "reading": "Sum of dimensioned transverse zones",
      "evidence": [],
      "dependencies": [
        "road-width",
        "footpath-zone",
        "kerb-zone"
      ]
    },
    {
      "id": "road-centre-offset",
      "value": 0.4318,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 5 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "crossfall",
      "value": 0.013888888888888888,
      "unit": "ratio",
      "status": "observed",
      "reading": "1 in 72",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "deck-thickness",
      "value": 0.1524,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 6 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "bearing-thickness",
      "value": 0.0127,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 0.5 in",
      "evidence": [
        "bearing-pad-detail"
      ],
      "dependencies": []
    },
    {
      "id": "bearing-width",
      "value": 0.2794,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 11 in",
      "evidence": [
        "bearing-pad-detail"
      ],
      "dependencies": []
    },
    {
      "id": "bearing-length",
      "value": 0.1524,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 6 in",
      "evidence": [
        "bearing-pad-detail"
      ],
      "dependencies": []
    },
    {
      "id": "support-pop",
      "value": 0.0254,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 1 in",
      "evidence": [
        "section-layout"
      ],
      "dependencies": []
    },
    {
      "id": "beam-spacing-m",
      "value": 0.9906,
      "unit": "m",
      "status": "observed",
      "reading": "3 ft 3 in",
      "evidence": [
        "beam-spacing"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-length-m",
      "value": 16.929100000000002,
      "unit": "m",
      "status": "observed",
      "reading": "55 ft 6.5 in",
      "evidence": [
        "beam-length"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-depth",
      "value": 0.9144000000000001,
      "unit": "m",
      "status": "observed",
      "reading": "3 ft 0 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-top-width",
      "value": 0.3048,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 0 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-web",
      "value": 0.1524,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 6 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-bottom-width",
      "value": 0.3048,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 0 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-top-thickness",
      "value": 0.127,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 5 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-bottom-concrete-reading",
      "value": 0.1524,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 6 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-bottom-reference-offset",
      "value": 0.0508,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 2 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "reference-axis"
    },
    {
      "id": "beam-bottom-thickness",
      "value": 0.2032,
      "unit": "m",
      "status": "derived",
      "reading": "Provisional bounding envelope: 6 in concrete reading plus 2 in unhatched reference offset; longitudinal slope interpretation unresolved",
      "evidence": [],
      "dependencies": [
        "beam-bottom-concrete-reading",
        "beam-bottom-reference-offset"
      ],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-bottom-taper",
      "value": 0.1016,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 4 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-top-taper",
      "value": 0.0508,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 2 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-top-overhang-left",
      "value": 0.0762,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 3 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-top-overhang-right",
      "value": 0.0762,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 3 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-straight-web-height",
      "value": 0.4318,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 5 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "exterior"
    },
    {
      "id": "beam-pipe-axis-offset",
      "value": 0.1016,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 4 in",
      "evidence": [
        "beam-section"
      ],
      "dependencies": [],
      "dimension_basis": "reference-axis"
    },
    {
      "id": "beams-per-span",
      "value": 8,
      "unit": "count",
      "status": "observed",
      "reading": "Eight beam lines visible in sheet 4 section",
      "evidence": [
        "beam-spacing"
      ],
      "dependencies": []
    },
    {
      "id": "pier-bearing-offset",
      "value": 0.168275,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 6.625 in",
      "evidence": [
        "bearing-offset"
      ],
      "dependencies": []
    },
    {
      "id": "slab-end-overhang",
      "value": 0.0762,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 3 in",
      "evidence": [
        "deck-overhang"
      ],
      "dependencies": []
    },
    {
      "id": "pier-cap-width",
      "value": 7.874,
      "unit": "m",
      "status": "observed",
      "reading": "25 ft 10 in",
      "evidence": [
        "pier-cap"
      ],
      "dependencies": []
    },
    {
      "id": "pier-cap-depth-x",
      "value": 0.762,
      "unit": "m",
      "status": "observed",
      "reading": "2 ft 6 in",
      "evidence": [
        "bearing-offset"
      ],
      "dependencies": []
    },
    {
      "id": "pier-cap-taper",
      "value": 0.6858000000000001,
      "unit": "m",
      "status": "observed",
      "reading": "2 ft 3 in",
      "evidence": [
        "pier-cap"
      ],
      "dependencies": []
    },
    {
      "id": "column-diameter-m",
      "value": 1.524,
      "unit": "m",
      "status": "observed",
      "reading": "5 ft 0 in",
      "evidence": [
        "column-diameter"
      ],
      "dependencies": []
    },
    {
      "id": "deck-fit-a",
      "value": 61.636656,
      "unit": "m",
      "status": "observed",
      "reading": "RL 202.22 ft",
      "evidence": [
        "deck-level-fit"
      ],
      "dependencies": []
    },
    {
      "id": "deck-fit-mid",
      "value": 61.136784000000006,
      "unit": "m",
      "status": "observed",
      "reading": "RL 200.58 ft",
      "evidence": [
        "deck-level-fit"
      ],
      "dependencies": []
    },
    {
      "id": "deck-fit-end",
      "value": 60.847224000000004,
      "unit": "m",
      "status": "observed",
      "reading": "RL 199.63 ft",
      "evidence": [
        "deck-level-fit"
      ],
      "dependencies": []
    },
    {
      "id": "rail-end-offset",
      "value": 0.8445500000000001,
      "unit": "m",
      "status": "observed",
      "reading": "2 ft 9.25 in",
      "evidence": [
        "rail-elevation-marks"
      ],
      "dependencies": []
    },
    {
      "id": "S1-kerb-rise",
      "value": 0.22860000000000003,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 9 in",
      "evidence": [
        "rail-height"
      ],
      "dependencies": []
    },
    {
      "id": "S2-kerb-rise",
      "value": 0.22860000000000003,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 9 in",
      "evidence": [
        "rail-height"
      ],
      "dependencies": []
    },
    {
      "id": "S3-kerb-rise",
      "value": 0.22860000000000003,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 9 in",
      "evidence": [
        "rail-height"
      ],
      "dependencies": []
    },
    {
      "id": "P1-cap-top-left",
      "value": 60.228480000000005,
      "unit": "m",
      "status": "observed",
      "reading": "RL 197.60 ft",
      "evidence": [
        "pier-levels"
      ],
      "dependencies": []
    },
    {
      "id": "P1-cap-bottom",
      "value": 58.573416,
      "unit": "m",
      "status": "observed",
      "reading": "RL 192.17 ft",
      "evidence": [
        "pier-cap"
      ],
      "dependencies": []
    },
    {
      "id": "P1-column-base",
      "value": 52.477416,
      "unit": "m",
      "status": "observed",
      "reading": "RL 172.17 ft",
      "evidence": [
        "pier-columns"
      ],
      "dependencies": []
    },
    {
      "id": "P1-footing-bottom",
      "value": 47.8536,
      "unit": "m",
      "status": "observed",
      "reading": "RL 157.00 ft",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-cap-longitudinal-drop",
      "value": 0.0127,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 0.5 in",
      "evidence": [
        "pier-cap-longitudinal-fall"
      ],
      "dependencies": []
    },
    {
      "id": "P1-base-width",
      "value": 1.6764000000000001,
      "unit": "m",
      "status": "observed",
      "reading": "5 ft 6 in",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-base-length",
      "value": 2.1336,
      "unit": "m",
      "status": "observed",
      "reading": "7 ft 0 in",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-foot-width",
      "value": 2.5908,
      "unit": "m",
      "status": "observed",
      "reading": "8 ft 6 in",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-foot-length",
      "value": 3.048,
      "unit": "m",
      "status": "observed",
      "reading": "10 ft 0 in",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-foot-thickness",
      "value": 0.762,
      "unit": "m",
      "status": "observed",
      "reading": "2 ft 6 in",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P1-base-angle",
      "value": 0.6981317007977318,
      "unit": "rad",
      "status": "observed",
      "reading": "40 degrees to bridge centreline",
      "evidence": [
        "pier-b-foundation"
      ],
      "dependencies": []
    },
    {
      "id": "P2-cap-top-left",
      "value": 59.960256,
      "unit": "m",
      "status": "observed",
      "reading": "RL 196.72 ft",
      "evidence": [
        "pier-levels"
      ],
      "dependencies": []
    },
    {
      "id": "P2-cap-bottom",
      "value": 58.305192,
      "unit": "m",
      "status": "observed",
      "reading": "RL 191.29 ft",
      "evidence": [
        "pier-cap"
      ],
      "dependencies": []
    },
    {
      "id": "P2-column-base",
      "value": 52.209192,
      "unit": "m",
      "status": "observed",
      "reading": "RL 171.29 ft",
      "evidence": [
        "pier-columns"
      ],
      "dependencies": []
    },
    {
      "id": "P2-footing-bottom",
      "value": 45.110400000000006,
      "unit": "m",
      "status": "observed",
      "reading": "RL 148.00 ft",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-cap-longitudinal-drop",
      "value": 0.009525,
      "unit": "m",
      "status": "observed",
      "reading": "0 ft 0.375 in",
      "evidence": [
        "pier-cap-longitudinal-fall"
      ],
      "dependencies": []
    },
    {
      "id": "P2-base-width",
      "value": 1.6764000000000001,
      "unit": "m",
      "status": "observed",
      "reading": "5 ft 6 in",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-base-length",
      "value": 2.1336,
      "unit": "m",
      "status": "observed",
      "reading": "7 ft 0 in",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-foot-width",
      "value": 2.5908,
      "unit": "m",
      "status": "observed",
      "reading": "8 ft 6 in",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-foot-length",
      "value": 3.048,
      "unit": "m",
      "status": "observed",
      "reading": "10 ft 0 in",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-foot-thickness",
      "value": 0.762,
      "unit": "m",
      "status": "observed",
      "reading": "2 ft 6 in",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "P2-base-angle",
      "value": 0.6981317007977318,
      "unit": "rad",
      "status": "observed",
      "reading": "40 degrees to bridge centreline",
      "evidence": [
        "pier-c-amendment"
      ],
      "dependencies": []
    },
    {
      "id": "abutment-seat-width",
      "value": 8.5344,
      "unit": "m",
      "status": "observed",
      "reading": "28 ft 0 in",
      "evidence": [
        "abutment-seat-levels"
      ],
      "dependencies": []
    },
    {
      "id": "abutment-seat-height",
      "value": 1.0668,
      "unit": "m",
      "status": "observed",
      "reading": "3 ft 6 in",
      "evidence": [
        "abutment-seat-section"
      ],
      "dependencies": []
    },
    {
      "id": "abutment-seat-rear-offset",
      "value": 0.4826000000000001,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 7 in",
      "evidence": [
        "abutment-seat-section"
      ],
      "dependencies": []
    },
    {
      "id": "abutment-seat-front-offset",
      "value": 0.3556,
      "unit": "m",
      "status": "observed",
      "reading": "1 ft 2 in",
      "evidence": [
        "abutment-seat-section"
      ],
      "dependencies": []
    },
    {
      "id": "A1-seat-bottom-left",
      "value": 16.864584000000004,
      "unit": "m",
      "status": "observed",
      "reading": "RL 195.33 ft minus local datum 140 ft",
      "evidence": [
        "abutment-seat-levels"
      ],
      "dependencies": []
    },
    {
      "id": "A1-seat-bottom-right",
      "value": 16.745712,
      "unit": "m",
      "status": "observed",
      "reading": "RL 194.94 ft minus local datum 140 ft",
      "evidence": [
        "abutment-seat-levels"
      ],
      "dependencies": []
    },
    {
      "id": "A2-seat-bottom-left",
      "value": 16.053815999999998,
      "unit": "m",
      "status": "observed",
      "reading": "RL 192.67 ft minus local datum 140 ft",
      "evidence": [
        "abutment-seat-levels"
      ],
      "dependencies": []
    },
    {
      "id": "A2-seat-bottom-right",
      "value": 15.934944000000002,
      "unit": "m",
      "status": "observed",
      "reading": "RL 192.28 ft minus local datum 140 ft",
      "evidence": [
        "abutment-seat-levels"
      ],
      "dependencies": []
    },
    {
      "id": "abutment-exterior",
      "value": null,
      "unit": "m",
      "status": "unknown",
      "reading": "External cylinder diameter and full stepped cap sections unresolved",
      "evidence": [
        "abutment-foundations",
        "abutment-section"
      ],
      "dependencies": []
    },
    {
      "id": "approach-geometry",
      "value": null,
      "unit": "m",
      "status": "unknown",
      "reading": "No measured current approach geometry",
      "evidence": [
        "approaches"
      ],
      "dependencies": []
    }
  ],
  "groups": [
    {
      "id": "AP1",
      "type": "AP",
      "number": 1,
      "label": "Approach 1"
    },
    {
      "id": "AP2",
      "type": "AP",
      "number": 2,
      "label": "Approach 2"
    },
    {
      "id": "A1",
      "type": "A",
      "number": 1,
      "label": "Abutment 1"
    },
    {
      "id": "A2",
      "type": "A",
      "number": 2,
      "label": "Abutment 2"
    },
    {
      "id": "S1",
      "type": "S",
      "number": 1,
      "label": "Span 1"
    },
    {
      "id": "S2",
      "type": "S",
      "number": 2,
      "label": "Span 2"
    },
    {
      "id": "S3",
      "type": "S",
      "number": 3,
      "label": "Span 3"
    },
    {
      "id": "P1",
      "type": "P",
      "number": 1,
      "label": "Pier 1"
    },
    {
      "id": "P2",
      "type": "P",
      "number": 2,
      "label": "Pier 2"
    }
  ],
  "elements": [
    {
      "id": "S1-deck",
      "label": "Deck slab",
      "group": "S1",
      "kind": "deck",
      "code": 200,
      "material": "C",
      "parameters": [
        "span-ab",
        "span-bc",
        "span-cd",
        "back-offset",
        "deck-fit-a",
        "deck-fit-mid",
        "deck-fit-end",
        "road-width",
        "footpath-zone",
        "kerb-zone",
        "road-centre-offset",
        "crossfall",
        "deck-thickness",
        "beam-length-m",
        "slab-end-overhang",
        "pier-bearing-offset"
      ],
      "evidence": [
        "section-layout",
        "deck-level-fit",
        "deck-overhang"
      ],
      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "nominal-solid",
      "limitations": [
        "Nominal 6 in slab; beam pops, ducts, drain holes, drip grooves and local joint profiles excluded."
      ],
      "geometry": {
        "type": "loft",
        "rings": [
          [
            [
              -0.15875000000000122,
              19.04012073433413,
              -4.724400000000001
            ],
            [
              -0.15875000000000122,
              18.910298512111908,
              4.622800000000001
            ],
            [
              -0.15875000000000122,
              18.757898512111908,
              4.622800000000001
            ],
            [
              -0.15875000000000122,
              18.88772073433413,
              -4.724400000000001
            ]
          ],
          [
            [
              0.19711458333333215,
              19.03150010928771,
              -4.724400000000001
            ],
            [
              0.19711458333333215,
              18.901677887065485,
              4.622800000000001
            ],
            [
              0.19711458333333215,
              18.749277887065485,
              4.622800000000001
            ],
            [
              0.19711458333333215,
              18.87910010928771,
              -4.724400000000001
            ]
          ],
          [
            [
              0.5529791666666655,
              19.022921682313356,
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      "limitations": [
        "Minimum footing envelope; shoulder flare not dimensioned. Not a concrete volume or proof of founding depth."
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      "limitations": [
        "Rectangular exterior envelope; amended Pier C caisson walls, internal fill and sloping construction joints excluded. Quantity belongs to the combined foundation."
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      "inventory_name": "Pile cap/Footing",
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      "id": "A1-bearing-seat",
      "label": "Abutment A central bearing seat",
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      "parameters": [
        "abutment-seat-width",
        "abutment-seat-height",
        "abutment-seat-rear-offset",
        "abutment-seat-front-offset",
        "A1-seat-bottom-left",
        "A1-seat-bottom-right",
        "span-ab",
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        "abutment-seat-levels"
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      "section_dimensions": {},
      "fidelity": "nominal-solid",
      "limitations": [
        "Lower central block only; upper stepped backwall and wingwalls remain separately unresolved. Local chamfers, dowel bores and reinforcement not represented."
      ],
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      "quantity": {
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      "inventory_name": "Abutment",
      "material_name": "Reinforced concrete"
    },
    {
      "id": "A2-bearing-seat",
      "label": "Abutment D central bearing seat",
      "group": "A2",
      "kind": "abutment",
      "code": 400,
      "material": "C",
      "parameters": [
        "abutment-seat-width",
        "abutment-seat-height",
        "abutment-seat-rear-offset",
        "abutment-seat-front-offset",
        "A2-seat-bottom-left",
        "A2-seat-bottom-right",
        "span-ab",
        "span-bc",
        "span-cd"
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      "evidence": [
        "abutment-seat-section",
        "abutment-seat-levels"
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      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "nominal-solid",
      "limitations": [
        "Lower central block only; upper stepped backwall and wingwalls remain separately unresolved. Local chamfers, dowel bores and reinforcement not represented."
      ],
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      "review": "unreviewed",
      "inventory_name": "Abutment",
      "material_name": "Reinforced concrete"
    },
    {
      "id": "A1-abutment",
      "label": "Abutment A",
      "group": "A1",
      "kind": "abutment",
      "code": 400,
      "material": "C",
      "parameters": [
        "abutment-exterior"
      ],
      "evidence": [
        "abutment-caps",
        "abutment-foundations",
        "abutment-section"
      ],
      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "unresolved",
      "limitations": [
        "Central bearing-seat block compiled separately. Two cylinder foundations, wingwalls and upper stepped backwall remain unresolved pending exterior dimensions and revised RL reconciliation."
      ],
      "geometry": null,
      "quantity": {
        "value": null,
        "unit": "m",
        "status": "unknown"
      },
      "exposure": null,
      "review": "unreviewed",
      "inventory_name": "Abutment",
      "material_name": "Reinforced concrete"
    },
    {
      "id": "AP1-approach",
      "label": "Approach 1",
      "group": "AP1",
      "kind": "approach",
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      "material": "O",
      "parameters": [
        "approach-geometry"
      ],
      "evidence": [
        "approaches"
      ],
      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "unresolved",
      "limitations": [
        "Current approach assets are not established by the original construction drawings."
      ],
      "geometry": null,
      "quantity": {
        "value": null,
        "unit": "m2",
        "status": "unknown"
      },
      "exposure": null,
      "review": "unreviewed",
      "inventory_name": "Wearing surface",
      "material_name": "Other"
    },
    {
      "id": "A2-abutment",
      "label": "Abutment D",
      "group": "A2",
      "kind": "abutment",
      "code": 400,
      "material": "C",
      "parameters": [
        "abutment-exterior"
      ],
      "evidence": [
        "abutment-caps",
        "abutment-foundations",
        "abutment-section"
      ],
      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "unresolved",
      "limitations": [
        "Central bearing-seat block compiled separately. Two cylinder foundations, wingwalls and upper stepped backwall remain unresolved pending exterior dimensions and revised RL reconciliation."
      ],
      "geometry": null,
      "quantity": {
        "value": null,
        "unit": "m",
        "status": "unknown"
      },
      "exposure": null,
      "review": "unreviewed",
      "inventory_name": "Abutment",
      "material_name": "Reinforced concrete"
    },
    {
      "id": "AP2-approach",
      "label": "Approach 2",
      "group": "AP2",
      "kind": "approach",
      "code": 1,
      "material": "O",
      "parameters": [
        "approach-geometry"
      ],
      "evidence": [
        "approaches"
      ],
      "dimension_chains": [],
      "section_dimensions": {},
      "fidelity": "unresolved",
      "limitations": [
        "Current approach assets are not established by the original construction drawings."
      ],
      "geometry": null,
      "quantity": {
        "value": null,
        "unit": "m2",
        "status": "unknown"
      },
      "exposure": null,
      "review": "unreviewed",
      "inventory_name": "Wearing surface",
      "material_name": "Other"
    }
  ],
  "decisions": [
    {
      "id": "pier-c-revision",
      "evidence": [
        "pier-c-amendment",
        "pier-b-foundation"
      ],
      "decision": "Use WGR1593 for Pier C base; retain sheet 3 for cap and column. Do not copy Pier B base construction."
    },
    {
      "id": "cap-width-revision",
      "evidence": [
        "pier-cap"
      ],
      "decision": "Use handwritten 25 ft 10 in exterior width; RL reference offsets remain the dimensioned 12 ft 9 in either side. Engineer confirmation pending."
    },
    {
      "id": "transverse-datum",
      "evidence": [
        "section-layout"
      ],
      "decision": "Keep the explicit 1 ft 5 in road-to-bridge offset and zone widths. They place the deck centroid 2 in left of the bridge centreline; no forced symmetry."
    }
  ],
  "limitations": [
    "Geometry and transcriptions have not been accepted by an independent engineer.",
    "The eight-sheet set does not establish current as-built dimensions, exposure class or georeferencing.",
    "Abutment upper backwalls, wingwalls and cylinders, handrails, diaphragms and approaches remain explicit unresolved geometry.",
    "Beam end blocks, camber, stubs, holes, chamfers and foundation transition details are not complete.",
    "A valid mesh and an inventory agreement do not establish geometry accuracy. See independent checks and coverage."
  ],
  "dimension_chains": [
    {
      "id": "beam-width-chain",
      "total": "beam-top-width",
      "parts": [
        "beam-top-overhang-left",
        "beam-web",
        "beam-top-overhang-right"
      ],
      "basis": "exterior",
      "evidence": [
        "beam-section"
      ],
      "tolerance_m": 1e-09
    },
    {
      "id": "beam-depth-chain",
      "total": "beam-depth",
      "parts": [
        "beam-top-thickness",
        "beam-top-taper",
        "beam-straight-web-height",
        "beam-bottom-taper",
        "beam-bottom-thickness"
      ],
      "basis": "exterior",
      "evidence": [
        "beam-section"
      ],
      "tolerance_m": 1e-09,
      "interpretation_status": "unresolved",
      "interpretation_reason": "The 2 in unhatched bottom offset cannot yet be counted as concrete; closure describes only a provisional envelope."
    }
  ],
  "alignment": {
    "supports": [
      0,
      16.932275,
      34.032825,
      50.96510000000001
    ],
    "backs": [
      -0.3556,
      51.32070000000001
    ],
    "road_centre_z": 0.4318,
    "deck_edges_z": [
      -4.724400000000001,
      4.622800000000001
    ],
    "profile_fit_stations_m": [
      0,
      24.888825000000004,
      49.272825000000005
    ],
    "datum_note": "Local historical RL in feet, shifted by 140 ft for rendering. No NZVD transformation or georeferencing established."
  },
  "component_schedules": {
    "handrail": {
      "evidence": [
        "rail-panel-schedule",
        "rail-elevation-marks",
        "rail-post-schedule"
      ],
      "review": "unreviewed",
      "panel_sequence_per_side": [
        "A",
        "B",
        "B",
        "B",
        "C",
        "B",
        "C",
        "D",
        "D",
        "E",
        "E",
        "E",
        "E",
        "F",
        "F",
        "F",
        "G"
      ],
      "panels": [
        {
          "mark": "A",
          "count": 2,
          "length_m": 2.0955,
          "bar_count": 13,
          "drop_m": 0.047625
        },
        {
          "mark": "B",
          "count": 8,
          "length_m": 3.0099,
          "bar_count": 19,
          "drop_m": 0.06985
        },
        {
          "mark": "C",
          "count": 4,
          "length_m": 3.0099,
          "bar_count": 19,
          "drop_m": 0.057150000000000006
        },
        {
          "mark": "D",
          "count": 4,
          "length_m": 3.0099,
          "bar_count": 19,
          "drop_m": 0.04445
        },
        {
          "mark": "E",
          "count": 8,
          "length_m": 3.0099,
          "bar_count": 19,
          "drop_m": 0.0381
        },
        {
          "mark": "F",
          "count": 6,
          "length_m": 3.0099,
          "bar_count": 19,
          "drop_m": 0.03175
        },
        {
          "mark": "G",
          "count": 2,
          "length_m": 2.0955,
          "bar_count": 13,
          "drop_m": 0.015875
        }
      ],
      "posts": [
        {
          "mark": 1,
          "count": 8,
          "angle_deg": 45
        },
        {
          "mark": 2,
          "count": 4,
          "angle_deg": 45
        },
        {
          "mark": 3,
          "count": 6,
          "angle_deg": 65
        },
        {
          "mark": 4,
          "count": 4,
          "angle_deg": 65
        },
        {
          "mark": 5,
          "count": 6,
          "angle_deg": 90
        },
        {
          "mark": 6,
          "count": 4,
          "angle_deg": 90
        }
      ],
      "start_x_m": 0.4889500000000001,
      "end_x_m": 50.47615000000001,
      "bay_lengths_m": [
        2.1336,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        3.048,
        2.1336
      ],
      "limitations": [
        "Panel/post schedule transcribed; mounting offsets and full member sections still need reconciliation before assembly geometry."
      ]
    },
    "beam_diaphragms": {
      "evidence": [
        "beam-diaphragm-stations",
        "beam-length"
      ],
      "review": "unreviewed",
      "origin": "precast beam near end; X towards far end",
      "offsets_from_beam_end_m": [
        4.19735,
        8.464550000000001,
        12.731750000000002
      ],
      "end_offset_m": 4.19735,
      "spacing_m": 4.2672,
      "stations_by_span": {
        "S1": [
          4.114799999999999,
          8.382,
          12.6492
        ],
        "S2": [
          21.21535,
          25.482550000000003,
          29.749750000000002
        ],
        "S3": [
          38.315900000000006,
          42.58310000000001,
          46.850300000000004
        ]
      },
      "limitations": [
        "Station schedule only. Section, infill interfaces, outer-beam stub exceptions and linkage recesses remain unresolved; no diaphragm solid is implied."
      ]
    }
  },
  "source_feature_register": {
    "method": "curated discovery seed",
    "exhaustive_discovery_established": false,
    "sheets": [
      {
        "sheet": "sheet-1",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-2",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-3",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-4",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-5",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-6",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-7",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      },
      {
        "sheet": "sheet-8",
        "status": "unreviewed",
        "reason": "No complete feature-discovery review has been recorded."
      }
    ],
    "features": [
      {
        "id": "deck-system",
        "label": "Deck surfaces and transverse joints",
        "evidence": [
          "section-layout",
          "deck-overhang"
        ],
        "elements": [
          "S1-deck",
          "S2-deck",
          "S3-deck"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "beam-sections",
        "label": "Beam sections, end blocks, stubs and camber",
        "evidence": [
          "beam-section",
          "beam-length"
        ],
        "elements": [
          "S1-beam-1",
          "S1-beam-2",
          "S1-beam-3",
          "S1-beam-4",
          "S1-beam-5",
          "S1-beam-6",
          "S1-beam-7",
          "S1-beam-8",
          "S2-beam-1",
          "S2-beam-2",
          "S2-beam-3",
          "S2-beam-4",
          "S2-beam-5",
          "S2-beam-6",
          "S2-beam-7",
          "S2-beam-8",
          "S3-beam-1",
          "S3-beam-2",
          "S3-beam-3",
          "S3-beam-4",
          "S3-beam-5",
          "S3-beam-6",
          "S3-beam-7",
          "S3-beam-8"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "bearings",
        "label": "Bearing pads, dowel openings and contacts",
        "evidence": [
          "bearing-pad-detail"
        ],
        "elements": [
          "S1-bearing-1-near",
          "S1-bearing-1-far",
          "S1-bearing-2-near",
          "S1-bearing-2-far",
          "S1-bearing-3-near",
          "S1-bearing-3-far",
          "S1-bearing-4-near",
          "S1-bearing-4-far",
          "S1-bearing-5-near",
          "S1-bearing-5-far",
          "S1-bearing-6-near",
          "S1-bearing-6-far",
          "S1-bearing-7-near",
          "S1-bearing-7-far",
          "S1-bearing-8-near",
          "S1-bearing-8-far",
          "S2-bearing-1-near",
          "S2-bearing-1-far",
          "S2-bearing-2-near",
          "S2-bearing-2-far",
          "S2-bearing-3-near",
          "S2-bearing-3-far",
          "S2-bearing-4-near",
          "S2-bearing-4-far",
          "S2-bearing-5-near",
          "S2-bearing-5-far",
          "S2-bearing-6-near",
          "S2-bearing-6-far",
          "S2-bearing-7-near",
          "S2-bearing-7-far",
          "S2-bearing-8-near",
          "S2-bearing-8-far",
          "S3-bearing-1-near",
          "S3-bearing-1-far",
          "S3-bearing-2-near",
          "S3-bearing-2-far",
          "S3-bearing-3-near",
          "S3-bearing-3-far",
          "S3-bearing-4-near",
          "S3-bearing-4-far",
          "S3-bearing-5-near",
          "S3-bearing-5-far",
          "S3-bearing-6-near",
          "S3-bearing-6-far",
          "S3-bearing-7-near",
          "S3-bearing-7-far",
          "S3-bearing-8-near",
          "S3-bearing-8-far"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "pier-caps",
        "label": "Pier caps, falls, dowels and chamfers",
        "evidence": [
          "pier-cap",
          "pier-cap-longitudinal-fall"
        ],
        "elements": [
          "P1-cap",
          "P2-cap"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "pier-columns",
        "label": "Pier columns",
        "evidence": [
          "pier-columns"
        ],
        "elements": [
          "P1-column",
          "P2-column"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "foundations",
        "label": "Pier foundations and amended Pier C base",
        "evidence": [
          "pier-b-foundation",
          "pier-c-amendment"
        ],
        "elements": [
          "P1-foundation",
          "P1-base",
          "P2-foundation",
          "P2-base"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "abutments",
        "label": "Abutment seats, upper walls, wings and cylinders",
        "evidence": [
          "abutment-section",
          "abutment-foundations"
        ],
        "elements": [
          "A1-bearing-seat",
          "A2-bearing-seat",
          "A1-abutment",
          "A2-abutment"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "handrails",
        "label": "Installed rail panels, posts and connections",
        "evidence": [
          "rail-section",
          "rail-panel-member-section"
        ],
        "elements": [
          "S1-rail-left",
          "S1-rail-right",
          "S2-rail-left",
          "S2-rail-right",
          "S3-rail-left",
          "S3-rail-right"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "footpaths",
        "label": "Footpath section, ducts, lips and voids",
        "evidence": [
          "kerb-section",
          "section-layout"
        ],
        "elements": [
          "S1-footpath",
          "S2-footpath",
          "S3-footpath"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "kerbs",
        "label": "Kerb sections, joints and mounting details",
        "evidence": [
          "kerb-section"
        ],
        "elements": [
          "S1-kerb",
          "S2-kerb",
          "S3-kerb"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "diaphragms",
        "label": "Diaphragms, linkage and infill interfaces",
        "evidence": [
          "diaphragms",
          "beam-diaphragm-stations"
        ],
        "elements": [
          "S1-diaphragms",
          "S2-diaphragms",
          "S3-diaphragms"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      },
      {
        "id": "approaches",
        "label": "Approach geometry and source limits",
        "evidence": [
          "approaches"
        ],
        "elements": [
          "AP1-approach",
          "AP2-approach"
        ],
        "review": "unreviewed",
        "status": "partial",
        "reason": "Source family registered; complete dimensions, details and placement have not all been accepted."
      }
    ]
  },
  "taxonomy": {
    "filename": "StructureComponents_20260729.xlsx",
    "sha256": "78acbd1336f1805feb65b45ba1ec448dd5325d9a68dcb79f85cac4a50e75fc42",
    "sheets_read": [
      "Element",
      "Material"
    ],
    "inventory_sheets_read": false
  }
}