{"schemaVersion":1,"title":"B1\u2013B6 source and assumption review","datumAbsoluteFt":310,"status":"Partial reconstruction with qualified wall and separate construction illustration","levels":[{"id":"B1","basementNumber":1,"label":"B1 \u00b7 Service level","architecturalLabel":"Service level","elevationAbsoluteFt":294,"elevationFt":-16,"source":"A-A-16 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"Electrical substation, maintenance/service rooms, mail room and elevator/core spaces. The plan has local openings and different room boundaries from the floors below.","plans":[{"id":"A-A-16","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-16.tif","sha256":"a34714313dccaee16099534f3a224fb7f9146796045e9da13f009292bbde6ff8","file":"sublevel-B1-TowerA.png","label":"A-A-16 \u00b7 Tower A B1 \u00b7 EL294","pixelSize":[4896,3637],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"Electrical substation, maintenance/service rooms, mail room and elevator/core spaces. The plan has local openings and different room boundaries from the floors below."}]},{"id":"B2","basementNumber":2,"label":"B2 \u00b7 Sublevel 1","architecturalLabel":"Sublevel 1","elevationAbsoluteFt":284,"elevationFt":-26,"source":"A-A-14 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"Storage and unassigned spaces around elevator pits, shafts, stairs and transfer plenums. These are Tower A plan uses, not a uniform site-wide floor program.","plans":[{"id":"A-A-14","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-14.tif","sha256":"bfecd9f7890aaaad36a5e2835cc1d4e99dc2d4a8861484f3bde0a9bf0a7fb615","file":"sublevel-B2-TowerA.png","label":"A-A-14 \u00b7 Tower A B2 \u00b7 EL284","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"Storage and unassigned spaces around elevator pits, shafts, stairs and transfer plenums. These are Tower A plan uses, not a uniform site-wide floor program."}]},{"id":"B3","basementNumber":3,"label":"B3 \u00b7 Sublevel 2","architecturalLabel":"Sublevel 2","elevationAbsoluteFt":274,"elevationFt":-36,"source":"A-A-12 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"Tower A tenant storage, equipment/core spaces and transfer plenums. The 1984 site survey separately shows surrounding parking and service areas.","plans":[{"id":"A-A-12","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-12.tif","sha256":"dbac09d055326810147e3a20669eda947521174ff57039da0b7724a4daa9b65d","file":"sublevel-B3-TowerA.png","label":"A-A-12 \u00b7 Tower A B3 \u00b7 EL274","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"Tower A tenant storage, equipment/core spaces and transfer plenums. The 1984 site survey separately shows surrounding parking and service areas."},{"id":"SKA10/84","path":"sources/LERA - PLANS-022102/subLevels/SKA10-84.tif","sha256":"8e7277dc4f184c6dec83ee740044af444bb781c42d3aa3d6e629b41717254ccf","file":"sublevel-B3-site-1984.png","label":"SKA10/84 \u00b7 B3 site survey (1984)","pixelSize":[6112,3621],"imageTransform":"rotate 180 degrees","scope":"Site survey, including both towers","note":"Separate 1984 space survey. Its outlines and labels do not establish structural sections or final as-built details."}]},{"id":"B4","basementNumber":4,"label":"B4 \u00b7 Sublevel 3","architecturalLabel":"Sublevel 3","elevationAbsoluteFt":264,"elevationFt":-46,"source":"A-A-10 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"Tower A tenant storage, shafts and transfer plenums. SKA11/84 locates the PATH mezzanine elsewhere on this level; the entire floor is not a station mezzanine.","plans":[{"id":"A-A-10","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-10.tif","sha256":"8a2c27cb6259a1cbd8cbdf7adac7c77655d9fcc829e24bdd4afe5e84449f61f9","file":"sublevel-B4-TowerA.png","label":"A-A-10 \u00b7 Tower A B4 \u00b7 EL264","pixelSize":[4896,3633],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"Tower A tenant storage, shafts and transfer plenums. SKA11/84 locates the PATH mezzanine elsewhere on this level; the entire floor is not a station mezzanine."},{"id":"SKA11/84","path":"sources/LERA - PLANS-022102/subLevels/SKA11-84.tif","sha256":"2c7735030ee513b7ace8d06c1527d0e587307cb0f9e79527de43ddf0867bc6be","file":"sublevel-B4-site-1984.png","label":"SKA11/84 \u00b7 B4 site survey (1984)","pixelSize":[6112,3624],"imageTransform":"rotate 180 degrees","scope":"Site survey, including both towers","note":"Separate 1984 space survey. Its outlines and labels do not establish structural sections or final as-built details."}]},{"id":"B5","basementNumber":5,"label":"B5 \u00b7 Sublevel 4 / Upper mechanical equipment room","architecturalLabel":"Sublevel 4 / Upper mechanical equipment room","elevationAbsoluteFt":253,"elevationFt":-57,"source":"A-A-9 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"Upper mechanical space contains open regions and local plenum roofs. SKA12/84 covers EL250\u2013253; R-65 Section X-X gives the station platform top as EL250. Do not fill the tower with an ordinary complete slab at EL253.","plans":[{"id":"A-A-9","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-9.tif","sha256":"8b2897b12026d97096660f27c38d804cb291319ee99ad7f9b32ed5e4d7e9ec7f","file":"sublevel-B5-TowerA.png","label":"A-A-9 \u00b7 Tower A B5 \u00b7 EL253","pixelSize":[4896,3641],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"Upper mechanical space contains open regions and local plenum roofs. SKA12/84 covers EL250\u2013253; R-65 Section X-X gives the station platform top as EL250. Do not fill the tower with an ordinary complete slab at EL253."},{"id":"SKA12/84","path":"sources/LERA - PLANS-022102/subLevels/SKA12-84.tif","sha256":"a3302fd1ca9fce1d0adc6060e739d174147faa11e35c7bd2c8da1c10138fb151","file":"sublevel-B5-site-1984.png","label":"SKA12/84 \u00b7 B5 site survey (1984)","pixelSize":[4896,3629],"imageTransform":"rotate 180 degrees","scope":"Site survey, including both towers","note":"Separate 1984 space survey. Its outlines and labels do not establish structural sections or final as-built details."}],"localDatums":[{"label":"PATH platform top","elevationAbsoluteFt":250,"elevationFt":-60,"source":"R-65 Section X-X"},{"label":"PATH top of rail at section","elevationAbsoluteFt":246.5,"elevationFt":-63.5,"source":"R-65 Section X-X"}]},{"id":"B6","basementNumber":6,"label":"B6 \u00b7 Sublevel 5 / Lower mechanical equipment room","architecturalLabel":"Sublevel 5 / Lower mechanical equipment room","elevationAbsoluteFt":242,"elevationFt":-68,"source":"A-A-8 title and floor notes (Tower A)","scope":"Tower A architectural datum; site elevations may vary locally","status":"reference-level-only","modelable":false,"slabRegions":[],"note":"The lowest Tower A floor has mechanical equipment rooms, an AC transfer plenum, condensate pipe pits/trenches and a small stair/elevator cluster. Note 5 gives finish floor and top of slab EL242 unless locally noted otherwise. It is neither track invert nor a bedrock surface.","plans":[{"id":"A-A-8","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-8.tif","sha256":"4a308ee7eb66dc7f3fcb594ed23f1215a74399f180928cbe8b25a4347980b190","file":"sublevel-B6-TowerA.png","label":"A-A-8 \u00b7 Tower A B6 \u00b7 EL242","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees","scope":"Tower A only","note":"The lowest Tower A floor has mechanical equipment rooms, an AC transfer plenum, condensate pipe pits/trenches and a small stair/elevator cluster. Note 5 gives finish floor and top of slab EL242 unless locally noted otherwise. It is neither track invert nor a bedrock surface."}]}],"sources":[{"id":"A-A-16","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-16.tif","sha256":"a34714313dccaee16099534f3a224fb7f9146796045e9da13f009292bbde6ff8","file":"sublevel-B1-TowerA.png","label":"A-A-16 \u00b7 Tower A B1 \u00b7 EL294","pixelSize":[4896,3637],"imageTransform":"rotate 180 degrees"},{"id":"A-A-14","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-14.tif","sha256":"bfecd9f7890aaaad36a5e2835cc1d4e99dc2d4a8861484f3bde0a9bf0a7fb615","file":"sublevel-B2-TowerA.png","label":"A-A-14 \u00b7 Tower A B2 \u00b7 EL284","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees"},{"id":"A-A-12","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-12.tif","sha256":"dbac09d055326810147e3a20669eda947521174ff57039da0b7724a4daa9b65d","file":"sublevel-B3-TowerA.png","label":"A-A-12 \u00b7 Tower A B3 \u00b7 EL274","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees"},{"id":"SKA10/84","path":"sources/LERA - PLANS-022102/subLevels/SKA10-84.tif","sha256":"8e7277dc4f184c6dec83ee740044af444bb781c42d3aa3d6e629b41717254ccf","file":"sublevel-B3-site-1984.png","label":"SKA10/84 \u00b7 B3 site survey (1984)","pixelSize":[6112,3621],"imageTransform":"rotate 180 degrees"},{"id":"A-A-10","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-10.tif","sha256":"8a2c27cb6259a1cbd8cbdf7adac7c77655d9fcc829e24bdd4afe5e84449f61f9","file":"sublevel-B4-TowerA.png","label":"A-A-10 \u00b7 Tower A B4 \u00b7 EL264","pixelSize":[4896,3633],"imageTransform":"rotate 180 degrees"},{"id":"SKA11/84","path":"sources/LERA - PLANS-022102/subLevels/SKA11-84.tif","sha256":"2c7735030ee513b7ace8d06c1527d0e587307cb0f9e79527de43ddf0867bc6be","file":"sublevel-B4-site-1984.png","label":"SKA11/84 \u00b7 B4 site survey (1984)","pixelSize":[6112,3624],"imageTransform":"rotate 180 degrees"},{"id":"A-A-9","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-9.tif","sha256":"8b2897b12026d97096660f27c38d804cb291319ee99ad7f9b32ed5e4d7e9ec7f","file":"sublevel-B5-TowerA.png","label":"A-A-9 \u00b7 Tower A B5 \u00b7 EL253","pixelSize":[4896,3641],"imageTransform":"rotate 180 degrees"},{"id":"SKA12/84","path":"sources/LERA - PLANS-022102/subLevels/SKA12-84.tif","sha256":"a3302fd1ca9fce1d0adc6060e739d174147faa11e35c7bd2c8da1c10138fb151","file":"sublevel-B5-site-1984.png","label":"SKA12/84 \u00b7 B5 site survey (1984)","pixelSize":[4896,3629],"imageTransform":"rotate 180 degrees"},{"id":"A-A-8","path":"sources/LERA - PLANS-022102/PAC1 TOWER A/A-A-8.tif","sha256":"4a308ee7eb66dc7f3fcb594ed23f1215a74399f180928cbe8b25a4347980b190","file":"sublevel-B6-TowerA.png","label":"A-A-8 \u00b7 Tower A B6 \u00b7 EL242","pixelSize":[4896,3632],"imageTransform":"rotate 180 degrees"},{"id":"R-65","path":"sources/LERA - PLANS-022102/FoundationPlans/FILE0011.TIF","sha256":"c784d78103d279d0476373acf20c37329b6002e8a949ef721621c39f90df1b1c","file":"sublevel-R65-section.png","label":"R-65 \u00b7 platform, rail and excavation elevations","pixelCrop":[6650,1660,8470,2990]}],"findings":[{"id":"SUB-01","subject":"Level names and datums","status":"confirmed","finding":"Architectural Service Level is B1; Sublevels 1\u20135 are B2\u2013B6. Title elevations are 294, 284, 274, 264, 253 and 242 ft.","action":"Use the same six records in both bathtub views and foundation inspections.","source":"A-A-16, 14, 12, 10, 9, 8 title blocks"},{"id":"SUB-02","subject":"Continuous basement slabs and wall bracing","status":"unresolved-geometry","finding":"A level elevation does not define a site-wide diaphragm, a slab outline, its openings, thickness or connection to the slurry wall. B5 has extensive open upper fan-room space.","action":"No complete slab, full-perimeter diaphragm ring or inferred core hole is rendered. Level ticks are annotation only.","source":"All six Tower A plans; SKA10/84\u2013SKA12/84"},{"id":"SUB-03","subject":"Station and mechanical floor elevations","status":"confirmed-local-section","finding":"R-65 Section X-X labels platform top EL250, top of rail EL246\u20326\u2033 and local excavation EL243\u20324\u2033. Tower A B5 is EL253; B6 is EL242.","action":"Platform references have no invented thickness. Station rails use the local section datum. Approach grades remain unresolved.","source":"R-65 Section X-X; A-A-9; A-A-8"},{"id":"SUB-04","subject":"Railway geometry and switches","status":"approximate-plan-trace","finding":"SKA12/84 resolves the five-track/three-platform arrangement. Hand-traced curves and synthetic joined rail offsets do not establish switch blades, frogs, exact radii, clearances or setting-out coordinates.","action":"The SKA12 rereading corrects station/approach curves and Platform A. Keep the trace explicitly approximate. Rail lines alone clear the current steel, but a 9 \u00d7 12 ft diagnostic corridor still flags the scheduled South Tower column 301 section. This is not a sourced vehicle gauge; approach grades remain unresolved. The old tube on R-74 was removed, as required by 3-B3-8; it is distinct from the later terminal alignment.","source":"SKA12/84; R-65 Section X-X"},{"id":"SUB-05","subject":"Basement columns, framing and connections","status":"qualified-both-tower-supports","finding":"R-72 gives 47 named North Tower core workpoints, independently checked against B6. NIST Fig. 2\u20133 establishes the exterior column spacing and bracing pattern. NIST 1-2A \u00a73.2.4 distinguishes B5 brace-column junctions from floor framing: its floor did not frame into the perimeter spandrels. R-74 independently locates 43 ordinary South Tower core workpoints and 12 N/S support references. The original SB-125\u2013SB-128 elevations establish four different South Tower exterior frames and eight localized openings. Book 3 distinguishes permanent PT507/PT707/PT806/PT1007 from temporary TT607/TT907. Complete member and joint sections, floor openings and the surrounding plaza structure remain unresolved.","action":"Render 47 traced core columns, 84 perimeter columns and a representative perimeter frame for the North Tower, clipped between B6 and concourse. Steel sections are qualified display envelopes; gold junction markers identify connections without inventing their hardware. Omit the unsupported repeated B5 horizontal ring; retain its EL253 datum and mark only brace-column intersections of the qualified pattern. Preserve independent foundation components. Continue 43 South Tower ordinary core envelopes to the EL242 schedule cut. Add four permanent core trusses, eight split supports, two upper stems and four dimensioned apex bearing plates from Book 3. Remove the four temporary N/S607 and N/S907 markers; straight permanent columns remain there. Reconstruct all four South perimeter elevations from SB-125\u2013SB-128: 84 column axes, with 88 vertical segments, diagonal braces, transfer trusses and eight localized openings. Hanging columns connect to the tower above and interrupted columns resume below openings where shown. B3 and B5 have diagonal chamfer links at three corners, with none at the northeast corner. Eight terminal columns use Book 1 plate schedules and splice elevations through EL363; 26 chamfer links replace the former square-corner arms. Permanent transfer geometry uses written longitudinal dimensions and elevations, sixteen scheduled four-plate diagonal/support box sections and qualified bottom chords. The box interiors and web setbacks are modeled; eight support-joint weld schedules are recorded. Transverse registration, joint-end cuts, weld geometry, stiffeners, footing connections and floor framing remain incomplete. Opening locations come from the elevations, not clearance edits to the approximate railway. The rail lines clear the modeled tower steel; the separate diagnostic corridor still flags column 301. The later Book 1 corner correction changes eight column sections and the chamfer topology without moving the railway. Exact track setting-out, vehicle clearances and approach grades remain unresolved.","source":"Book 3: 3-B1-49, 3-B3-2\u201316; SB-125\u2013SB-128; 1-B2-18; R-72; R-74; A-A-8; NIST NCSTAR 1-1 pp. 9\u201311, Fig. 2\u20133 p. 19; NCSTAR 1-2A \u00a73.2.4 p. 35, Fig. 3\u20135 p. 36"},{"id":"SUB-06","subject":"Tower B anchors","status":"corrected","finding":"R-73 schedules 26 bore paths at 13 named Tower A columns only. Rotating them to Tower B falsely assigns Tower A details to a different tower.","action":"Render 26 Tower A drilled envelopes, zero inferred Tower B anchors, and independent Tower B R-74 contours.","source":"R-73; R-74"},{"id":"SUB-07","subject":"Bedrock and footing elevations","status":"removed-unsupported","finding":"General excavation varies across the plans. R-72/R-74 parenthesized values are highest permitted footing bottoms, not concrete tops or a uniform bedrock elevation.","action":"Remove the flat EL240 bedrock mesh. Retain 46 selected reference contours and four explicitly bounded minimum concrete envelopes.","source":"R-61; R-65; R-72; R-73; R-74"},{"id":"SUB-08","subject":"Wall panels, tiebacks and buttresses","status":"qualified-system-restoration","finding":"Tamaro documents a 3-ft cast-in-place wall, 158 panels, four to six original tieback tiers and 30\u201335 ft drilled into bedrock. Those dimensions do not locate individual joints, anchors or the wall toe. Original ties were decommissioned after the permanent floors braced the wall.","action":"Restore nominal wall thickness with explicit EL310/242 display cuts and PATH inspection windows. Show original tiebacks directly on the bathtub in a default-visible construction layer. Its 10-ft display spacing provides representative overall density; the five tiers, individual head elevations and inclination remain illustrative. Keep the unlocated section as a supplemental detail. Do not present the generated layout as an installed anchor schedule or restore unsupported buttresses or a flat rock surface. The R-61 reference to R-77 concerns internal buffer-wall anchors; it is not a verified perimeter tieback schedule.","source":"LERA R-60\u2013R-71; Tamaro, The Bridge 32(1), 2002 pp. 12\u201313; FEMA 403 Chapter 2"},{"id":"SUB-09","subject":"Ramps, stairs, pits, shafts and transfer framing","status":"unresolved-geometry","finding":"Their footprints and terminations vary by level. A generic spiral ramp to B6, repeated shaft holes or a guessed transfer truss cannot be derived from one site plan.","action":"Keep original level-specific drawings inspectable. No invented 3D circulation or repeated shaft volumes.","source":"A-A-8\u2013A-A-16; SKA10/84\u2013SKA12/84"},{"id":"SUB-10","subject":"Scope and drawing dates","status":"partial-source-coverage","finding":"Tower A architectural sheets with revisions, 1968 foundation drawings and 1984 space surveys are different evidence sets. A complete Tower B architectural B1\u2013B6 set and full-site B6 plan were not located.","action":"Retain sheet identity, TIFF hash and separate coverage for each source. Do not certify a complete final as-built reconstruction or mirror Tower A rooms to Tower B.","source":"Local LERA drawing inventory"},{"id":"SUB-11","subject":"Site coordinates and Tower B orientation","status":"corrected-from-survey-witnesses","finding":"R-69 and R-74 independently give Tower B center N4465.50 W9848.50, not W9842.50. In the established N4634/W9954 frame the tower centers are (\u2212111.5,\u2212168.5)/(105.5,168.5). R-74 is north-up: its wall 200 is Tower B north. The former east-up interpretation rotated the footing contours by 90 degrees.","action":"Correct Tower B registration and move its survey center six feet west. Preserve source pixels, footprint dimensions and elevations. Use these same survey centers in the above-grade towers, floor-block view, plaza openings and sublevels. Remove the old context similarity fit so no scale, rotation or translation separates the supports from the towers.","source":"R-64; R-69 center; R-74 center, north line N4569.08, south line N4361.92 and west line W9952.08"}],"missingPlans":["Complete Tower B architectural B1\u2013B6 plans","Full-site B6 plan","Installed perimeter tieback schedule, panel joints, local wall-top and rock-socket profiles","F-K-28, F-K-29, R-75, internal buffer-wall anchor section R-77 and final rock-bearing survey","Resolved subgrade member, connection, slab and trackwork schedules"]}