060929 Sect 106 - 1

PRESENTATION TOSECTION 106 CONSULTING PARTIES

SEPTEMBER 29, 2006

060929 Sect 106 - 2

AGENDA

1. Welcome

2. Review of Agenda

3. Museum Experience – WTCMF4. Memorial/Museum Design Update – DBB

a. North and South Tower Plansb. Footings

5. Access Considerations – DBBa. Slurry Wallb. Perimeter Box Beam Column Remnantsc. Consultation

6. Site Status – DBBa. Conditions Survey Statusb. Footprint Slab Remnantc. Construction Update

7. Vesey Street Stair Remnant Update – PANYNJ8. Artifacts Update – PANYNJ9. Next Steps

060929 Sect 106 - 3

Exhibition Sequence

060929 Sect 106 - 4September 5, 2006

Building the Memorial and MuseumBuilding the Memorial and Museum

060929 Sect 106 - 5

Aerial View of Memorial Quadrant

060929 Sect 106 - 6

The Memorial: Reflecting Absence

060929 Sect 106 - 7

The Memorial Plaza

060929 Sect 106 - 8

2

Cross-section of Memorial and Museum

060929 Sect 106 - 9

Memorial Museum Exhibit Level

OVERLOOK

060929 Sect 106 - 10

Memorial Museum Descent and Overlooks

OVERLOOK

060929 Sect 106 - 11

Memorial Museumat Bedrock

060929 Sect 106 - 12

060929 Sect 106 - 13

Design Update

060929 Sect 106 - 14EL.+242’: “BEDROCK” LEVEL

Key Responses:Minimized structural impactfrom columns.

Eliminated shear wallsfrom footprint areas.

Relocated mechanicalequipment.

Reorganized egress stairlocations.

060929 Sect 106 - 15

PLAN:SEPTEMBER 14, 2005

BEDROCK LEVEL: EL. +242’MEMORIAL MUSEUM SCHEMATIC DESIGN UPDATE

MUSEUMMEMORIALFAMILYMECHANICAL RM. AND EGRESS STAIRSOTHER PROJECTS

PATH TERMINAL

CHILLER PLANT

PLAN:AUGUST 31, 2006

CHILLER PLANT

MEMORIAL MUSEUMEGRESS STAIRSOTHER PROJECTS

PATH TERMINAL

060929 Sect 106 - 16

North Tower Construction

060929 Sect 106 - 17

North Tower Construction

85 ft133 ft

060929 Sect 106 - 18EL.+242’: “BEDROCK” LEVEL

North Tower Footprint South Tower Footprint

AREA OF TOWER CORE FOOTPRINTS

060929 Sect 106 - 19

Access ConsiderationsSLURRY WALL

060929 Sect 106 - 20

Key Design Issues:Long term solution.

Constructability.

Preservation.

Visitor experience.

Waterproofing.

Cost.

060929 Sect 106 - 21

Truss / Liner Wall / Counterfort Option

PREVIOUS SLURRY WALL OPTIONS (presented January 11, 2006)

Truss / Full Counterfort Option

060929 Sect 106 - 22

SLURRY WALL OPTION 1:LINER WALL / GLASS ENCLOSUREEXPOSED WALL = 20 ft x 48 ft

SLURRY WALL OPTION 2 :LINER WALL / OPEN PANELEXPOSED WALL = 20 ft x 58 ft

060929 Sect 106 - 23

SLURRY WALL OPTION 1:LINER WALL /GLASS ENCLOSURE

SLURRY WALL OPTION 2 :LINER WALL / OPEN PANEL

Option 1 Key Design Issues:Long term solution. PANYNJ Review Pending

Constructability. Resolved

Preservation. Consultation Pending

Visitor experience. Consultation Pending

Waterproofing. Resolved

Cost. Cost Estimate Pending

Option 2 Key Design Issues:Long term solution. PANYNJ Review Pending

Constructability. Resolved

Preservation. Consultation Pending

Visitor experience. Consultation Pending

Waterproofing. Resolved

Cost. Cost Estimate Pending

060929 Sect 106 - 24

Access ConsiderationsPERIMETER BOX COLUMNS

060929 Sect 106 - 25EL.+242’: “BEDROCK” LEVEL

Perimeter Slab Remnant Accessible at “Bedrock” LevelPerimeter Box Column Remnant Accessible at “Bedrock” Level

PERIMETERSLAB REMNANTACCESSIBLE AT“BEDROCK” LEVEL

PERIMETERBOX COLUMN REMNANTACCESSIBLE AT“BEDROCK” LEVEL

PERIMETERSLAB REMNANTACCESSIBLE AT“BEDROCK” LEVEL

PERIMETERBOX COLUMN REMNANTACCESSIBLE AT“BEDROCK” LEVEL

060929 Sect 106 - 26

Western Perimeter of North Tower, July 27,2005

Meaningful Access

Key Considerations:Preservation.

Visitor Experience.

Accessibility.

Safety.

060929 Sect 106 - 27

REMNANT

4” Thick Topping slab outsideof tower footprint

RAISED WALKWAYBETWEEN COLUMN REMNANTS

REMNANT

RAISED WALKWAYBETWEEN COLUMNREMNANTS

TOPPING SLAB

060929 Sect 106 - 28

Perimeter Slab Remnant4” topping slab

Perimeter Box Column RemnantsRaised Walkways (Locations TBD)

Recommended Access For AllAvailable Box Columns

060929 Sect 106 - 29

NORTH TOWERFOOTPRINT AREA

North Tower Excavation

South Tower Excavation

SOUTH TOWERFOOTPRINT AREA

Additional ProposedTreatment of Box Columns inSelect Areas

060929 Sect 106 - 30“BEDROCK LEVEL” - EXCAVATIONS

South Tower Excavation Area

North Tower Footprint South Tower Footprint

North Tower Excavation Area

Exposed Remnant

Exposed Remnant

Additional Proposed Treatment of Box Columns in Select Areas

060929 Sect 106 - 31“BEDROCK LEVEL” - EXCAVATIONS

Typical Excavated Remnant

Excavated Earth

Exposed Remnant

Excavated Perimeter Slab

060929 Sect 106 - 32“BEDROCK LEVEL” – NORTH TOWER EXCAVATION

1. North Tower Excavation Area Plan

2. North Tower Excavation Area Section

NORTH TOWERFOOTPRINT AREA

WALKWAY

060929 Sect 106 - 33“BEDROCK LEVEL” – SOUTH TOWER EXCAVATION

1. South Tower Excavation Area Plan

2. South Tower Excavation Area Section

SOUTH TOWERFOOTPRINT AREA

WALKWAY

060929 Sect 106 - 34

Raised Walkway:

Recommended Access For AllAvailable Box ColumnsProvides long term preservation.

Respectful and meaningful Visitor experience.

Resolves issues of accessibility and safety.

Areas of Excavation:

Proposed Treatment of BoxColumns in Select Areas

060929 Sect 106 - 35

SITE STATUSCONDITIONS SURVEY STATUS

060929 Sect 106 - 36

Survey dated May 3, 2006

Site Survey

Additional Information

North Tower Footprint:4 Core Columns Located

14 Steel Base Plates Located

South Tower Footprint:6 Additional Core Columns Located

(18 total located)

5 Steel Base Plates Located

060929 Sect 106 - 37

Site StatusFOOTPRINT SLAB

060929 Sect 106 - 38EL.+242’: “BEDROCK” LEVEL

Footprint Slab: Protective Membrane and Topping SlabTypical Museum Floor: 4” Topping Slab

FOOTPRINT SLAB:PROTECTIVEMEMBRANE ANDTOPPING SLAB

TYPICAL MUSEUMFLOOR: 4” TOPPINGSLAB

EXPOSEDPERIMETER SLABREMNANT

060929 Sect 106 - 39FOOTPRINT SLAB: Section & Detail

CONCRETE NOSE4” CONCRETE SLABPROTECTION BOARDWATERPROFFING MEMBRANESLAB TO REMAIN

BOX BEAM AND PERIMETERSLAB REMNANTS

TYPICAL 4” MUSEUM TOPPING SLAB

TYPICAL MUSUEMTOPPING SLABBOX BEAM AND PERIMETER SLABREMNANTFOOTPRINT SLAB

060929 Sect 106 - 40FOOTPRINT SLAB: Details

BOX BEAM AND PERIMETERSLAB REMNANTS

SLAB REMNANTBELOW

4” CONCRETE SLAB

4” CONCRETE SLAB

VISIBLESLAB REMNANT

DENSE FOAMPROTECTION BOARD

DENSE FOAMPROTECTION BOARD

060929 Sect 106 - 41

FOOTPRINT SLAB REMNANTS

North Tower Footprint South Tower Footprint

EL.+242’: “BEDROCK” LEVEL

060929 Sect 106 - 42EL.+242’: “BEDROCK” LEVEL

PROPOSED SLAB TO REMAIN IN SITU

North Tower Footprint South Tower Footprint