ATTACHMENT_2_GWMP_214371-Volume_2-_Final_RFP-Binder.pdf

Prepared for:

United States Department of the Interior Na onal Park Service Denver Service Center 12795 W. Alameda Parkway Denver, CO 80225

REHABILITATE NETHERLANDS CARILLON

TO IMPROVE SAFETY & VISITOR EXPERIENCE GWMP 214371

GEORGE WASHINGTON MEMORIAL PARKWAY, ARLINGTON, VA

FINAL RFP - VOLUME 2

September 27, 2018 Prepared by:

Mills + Schnoering Architects, LLC 200 Forrestal Road, Suite 3A Princeton, NJ 08540

Rehabilitate Netherlands Carillon to Improve Safety and Visitor Experience

Final RFP

Table of Contents

Volume 1 – Request for Proposal

Volume 2 – Final Schematic Design Support Documents

a) Basis of Design Report – Revised

b) Class B Cost Estimate - Revised

Volume 3- Final Schematic Design Drawings (11x17) – Revised

Rehabilitate Netherlands Carillon to Improve Safety and Visitor Experience Basis of Design Report GWMP 214371 Final Schematic Design Page ‐1

Basis of Design Report

GWMP 214371 – Rehabilitate Netherlands Carillon to Improve Safety and Visitor Experience

Architecture and Preservation Architecture

Introduction

The Netherlands Carillon is a historic property listed on the National Register of Historic Places as part of Arlington Ridge Park and is part of the National Park Service George Washington Memorial Parkway. The carillon is situated on a ridge overlooking the Potomac River and Washington, D.C. and provides expansive views of the National Mall, West Potomac Park, and Arlington Cemetery.

The Netherlands Carillon was a gift from the people of the Netherlands to the people of the United States in gratitude for aid during and after World War II. The monument symbolizes friendship between the two countries, as well as a common allegiance to the principles of freedom, justice, and democracy. The carillon originally housed 49 bells each carrying an emblem and verse representing a region and group within Dutch society.

The original gift of the bells was conceived in 1950. In 1952, on a trip to the United States, Queen Juliana of the Netherlands presented President Truman with a small silver bell in a ceremony held in Meridian Hill Park. Three leading Dutch foundries ‐ Van Bergen, B.

Eijsbouts, and Petit & Fritsen ‐ began casting the bells that year and the site within the George Washington Memorial Parkway was selected. The bells were shipped to the United States in 1954 and hung in a temporary structure on the polo grounds in West Potomac Park while funds were being raised in the Netherlands for a permanent tower.

Constructed in 1960 by Dutch architect Joost W.C. Boks, the 127‐foot open steel structure of the Netherlands Carillon is one of the first, if not the first, modernist monument constructed in the Capitol region.1 Two stylized bronze lion sculptures designed by Boks and carved by sculptor Paul Koning guard the entrance to the plaza.

Less than twenty‐five years after the carillon’s construction, a major renovation was undertaken in 1983.

In 1994, in anticipation of the 50th Anniversary of the liberation of the Netherlands from the Nazis, another restoration campaign was completed through a cooperative agreement with the Netherlands Chamber of Commerce. This campaign also included the addition of a 50th bell symbolizing liberation.

1 National Register Nomination for Arlington Ridge Park, referencing earlier 1999 Determination of Eligibility

Figure 1. Netherlands Carillion viewed from the east

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Since the 1994 restoration, the tower’s steel cladding is again showing severe signs of deterioration and all public access to the tower structure is closed. The National Park Service and the Royal Netherlands Embassy have teamed up to restore and upgrade the Netherlands Carillon. The NPS will fund the rehabilitation of the structure and upgrades to accessibility. The Embassy plans to restore and retune the bells, upgrade the operating system, and add three bells to make the monument a Grand Carillon.

Functional Analysis of Building Program

The functional requirements for the Project Program are to rehabilitate the carillon to improve safety and visitor experience through appropriate treatments according to the Secretary of Interior’s Standard for Treatment of Historic Properties. Rehabilitation acknowledges the need to alter or add to a historic property to meet continuing or changing uses while retaining the property’s historic character.

Visitor safety will be improved by arresting deterioration of the steel structure and cladding and making improvements at the stairs and railings.

Visitor experience will be improved by providing access to the observation decks.

The addition of three bells to elevate the status of the carillon to a grand carillon will also enhance visitor experience.

The Carillon is a musical instrument and its function as an instrument is paramount in the design and selection of materials. The acoustics and climate control within the Clavier Room are also integral in the function and preservation of the instrument.

The initial scope of work developed through the Value Analysis and Choosing‐by‐ Advantage process included the following features to enhance the preservation of the historic resource and improve safety and visitor experience.

Figure 2 Observation Deck 1 railing pickets are spaced too widely and floor decks do not drain.

Figure 3 Corroded steel cladding at upper bell level.

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1. Cladding panel treatment

2. Structural frame repair and reinforcement

3. Drainage and ventilation

a. Pitched floorplates and roof

b. Box beam weep holes

c. Installation of new vents

4. Railing improvements at Observation Decks

5. Stair Improvements

a. Main stair

b. Circular stair

6. Entrance gate security

7. Clavier Room Improvements

a. Acoustics

b. Climate control

c. Glazing

Figure 4 Corroded floor plate and base panels at Observation Deck 2 outside Clavier Room.

Figure 5 Clavier Room

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Code Analysis Summary

The Code Analysis prepared as part of the Accessibility Assessment in the Pre‐Design report indicated an occupancy for the tower no greater than 24 persons due to the single means of egress. The existing main stair meets Life Safety Code for tread depth and riser height but does not meet the IBC. The existing handrails and guardrail do not meet either code. The occupancy loads must be reviewed by the Authority Having Jurisdiction and a Park Management Plan must be put in place.

The following modifications were considered to provide safe public access to the tower observation decks; however, they were not accepted in the final scope of work due to costs.

Modification to outside open stair rails and a new continuous handrail at the inner handrail.

Addition of guardrails and riser panels at the stairs.

Change to the width of the main stair at the top four flights to a minimum 36” wide where it is currently constricted to 23”.

Modification to existing guardrails at the Upper and Lower Observation Decks ‐ by narrowing the spacing between pickets with the addition of a new picket between the existing or respacing pickets to 4” apart.

Addition of mesh to the open railing at the circular stair.

Please see plans (Drawing A‐0.1) for the Accessible Route at plaza.

The full code report from the Predesign phase is included as an appendix.

Figure 6 Main stair open railings

Figure 7 Railing at circular stair at Observation Deck 2

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Character Defining Features2

Bells The bells of the carillon are cast from a bronze alloy of approximately four‐fifths copper and one‐fifth tin. They range from the largest, six feet, nine inches in diameter and weighing 12,654 pounds, to the smallest, 8 inches in diameter and 35 pounds, for a total weight of 61,438 pounds. Each bell is inscribed with a verse and a low‐profile bas‐relief emblem. The verses were written by the Dutch poet, Ben van Eysselsteijn. The emblems, which are meant to represent the part of Dutch society or the province which donated the bell, were designed by Mrs. E. van der Grinten‐ Luecker, Louis Meijs, and Gerard van Remmen. Emblems on the twelve smallest bells symbolize the Dutch children and the emblems on the twelve largest bells represent the Dutch provinces. Originally there were a total of forty‐ nine bells;

a fiftieth was added in 1995 to commemorate the fiftieth anniversary of the liberation.

The Tower

The rectilinear tower is an open steel frame, 127 feet high, twenty‐five feet deep, and thirty‐six feet wide. Attached to the frame are steel plates, which originally had a baked enamel finish. Inside the tower, a rectangular stair leads to an open viewing platform; from here, a circular stair ascends to the glass‐enclosed playing cabin, eighty‐three feet above the ground, which houses the Carillon. In the playing‐cabin near the top of the tower are the wooden levers and pedals of the clavier. These are connected to the movable inner clappers of the stationary hanging bells.

The tower design recalls the abstract compositions based on grids and squares developed by Dutch artist Piet Mondrian in his late paintings of the 1930s and 1940s. The Carillon is thus an example of European modernism, unique in Washington memorial architecture. Within this framework, the Carillon and its decorative features are visually prominent.

The Plaza The tower stands in the center of a ninety‐three‐foot‐square plaza, originally paved with square quartzite tiles and surrounded by a broad, fourteen‐inch‐high wall made of a volcanic stone. The quartzite was replaced with slate in the mid 1990’s. Two stylized bronze lions flank the short ramp leading to the plaza on the east. The circular Floral Library and note‐shaped flower beds lie in front of the plaza to the east and a successional woodland provides the backdrop to the west.

2 Character defining features text is taken from the National Register Nomination for Arlington Ridge Park

Figure 8 Bell in Lower bell chamber

Figure 9 Paul Koning sculpture

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The Statues The two stylized bronze lions that flank the east entrance to the Carillon plaza are depicted “en couchant” – lying with their front legs stretched straight before them. The modern, somewhat abstract design of the lions was developed by Joost Boks and implemented by the Dutch sculptor Paul Koning.

In classical architecture, lions are symbolic of protection; they are also a symbol of the Dutch royal family.

Landscape:

The tree planting plan for the surrounding landscape was not undertaken until 1963. National Capital Parks landscape architects prepared the tree‐planting plan in the early 1960s.

Ten‐thousand tulip bulbs, an additional gift from the people of the Netherlands, were added in 1964 as part of the Beautification Program of the Lyndon B. Johnson administration, initiated by the First Lady, Lady Bird Johnson.

The bulbs were arranged in six curving beds along paths in front of the carillon that, when seen from the carillon tower, resemble the shape of two musical notes. A Tulip Library, designed in 1970, occupies the circular bed that lies directly in front of the tower and forms the centerpiece of the flowerbed composition.

Figure 10 Floral library and landscape

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Statement of Significance3

The Netherlands Carillon is eligible under Criterion C in the area of architecture. As stated in the 1999 Determination of Eligibility:

The Netherlands Carillon is exceptionally significant as one of the first, if not the first, examples of modern architecture being employed for a commemorative monument in the Nation’s Capital. The clean, unadorned lines of the steel memorial and its graceful, open form are in sharp contrast to the earlier classical, beaux‐arts and Art Deco memorials found throughout the Federal City. The interconnecting lines and rectangles of the structure’s frame are reminiscent of the work of Dutch abstract painter Piet Mondrian. The modernist design of the Carillon by Dutch master architect Joost W. C. Boks reflects the immediate postwar rejection of classical architecture in Europe on account of association with fascist regimes. Even the bronze lions, symbols of the Dutch monarchy, which guard the base, are highly stylized. The entire ensemble is clearly distinct from the realistic nature of the adjoining Iwo Jima Memorial.

The Netherlands Carillon is significant under Criterion A and Criterion Consideration F, for its extraordinary commemorative associations with the Second World War. The Carillon was a gift from the people of the Kingdom of the Netherlands to the people of the United States for the liberation of the Netherlands during the war, as well as for the generous assistance provided by the United States via the Marshall Plan following the war.

The Netherlands Carillon is also significant under Criterion C in landscape architecture and community planning and development for its association with the Beautification Program of the Lyndon B. Johnson administration. Initiated in 1964 by First Lady Bird Johnson, the program sought to embellish and improve the parks, playgrounds, and other public recreational areas of the District of Columbia. Placed along paths in front of the carillon are six curving beds that, when seen from the carillon tower, resemble the shape of two musical notes. Frank Péchin Law, Director‐ Carillonneur, The Netherlands Carillon, in 1969 stated that the people of the Netherlands presented the United States with an additional gift of over 10,000 tulip bulbs in 1964.

The Netherlands Carillon, dedicated in 1960, is also eligible under Criterion Consideration G as a resource less than 50 years of age. Of importance are the 10,000 tulips donated by the Netherlands and planted as part of the Beautification Program of the Lyndon B. Johnson administration.

3 Statement of Significance is taken from the National Register Nomination for Arlington Ridge Park.

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Materials and Methods

The work below is organized into a Base Bid, work under separate contract, and one option. The base scope of work is the rehabilitation of the tower. Work under separate contract includes work to the bells, and the option includes the application of liquid applied roofing membrane. Future work items are also listed.

Base Bid:

Staging

Fixed scaffolding to access architectural work; netting and scrim for safety Crane staging and site protection Crane mobilization – Traffic control / lane closure permits Site fencing and pedestrian management / signage Tree and landscape protection.

Temporary Facilities: Bathrooms, waste management and disposal Temporary Utilities: data as required by contractor.

Owner to allow contractor to tap into site electric and water.

Office and storage trailers, lockboxes

Rehabilitation of tower

Previous rehabilitation campaigns treated only the exterior face of the cladding, whereas this rehabilitation will also address corrosion on the back face of panels, as well as the structural frame.

The cladding scope will include the rehabilitation and replacement of cladding panels to match existing with new metalized primer and high‐performance coatings.

Other treatment options considered included the replacement of cladding with a more durable material including fiberglass, anodized aluminum, Alucobond, and stainless steel. These options were removed from consideration due to the loss of historic material, the potential for the sound of the instrument to be changed, and higher costs. Another option to cut each panel perimeter enough to allow the introduction of a waterproofing joint that can provide a seal was dismissed from consideration due to the change in appearance. Alternative design ideas included a plastic fin which could be attached to the top of each panel at the back, but the attachment detail and the possibility for it to also hold water was discounted from further research.

Rehabbing and repainting of the steel cladding consists of rehabilitation and preservation maintenance for 85% of the steel panels. In cases where rehabilitation is not possible due to the extensive deterioration, especially at ceilings, the panels will be replaced in‐kind to match the original. The loss of historic material will be approximately 10‐15%. Much of the replacement is in ceilings and includes some panels that were replaced in previous rehabilitations. The proposed approach is consistent with the Secretary of the Interior’s Standards for the Treatment of Historic Properties. The cladding will not

GWMP 214371 Final Schematic Design Page ‐9 be more noticeable to the casual observer following the proposed undertaking; rather the elimination of visible rust, peeling and chalking coatings, and removal of graffiti will improve its appearance to visitors within the park.

In the early 1970s, the carillon was repainted a gray blue color. There is evidence from paint analysis that all the paint was stripped prior to repainting. In 1983, less than twenty‐five years after the carillon’s construction, a major renovation was undertaken to address deterioration of the steel panels.

At this time, ceiling panels were replaced in areas and weep holes and vents were added to improve drainage. Again, the tower was repainted the light gray blue color, both times without with the approval of the U.S. Commission of Fine Arts (CFA). In 1994, the dark bronze color of the tower was restored with the approval of the CFA. The paint color indicated below is the same and was reviewed and approved by the CFA during concept review.

The sloping of top plates and drilling weep holes in bottom plates will be used to mitigate deterioration from water infiltration. The checkered‐plate floor plates at the Observation Decks and the soundboard roof plates will be replaced in‐kind with galvanized steel checkered plates. They will be reinstalled on new steel framing to create a 1/8” over 1’‐0” pitch to the outside edge to eliminate ponding on the decks which has caused significant deterioration. The increase in height at the stair core/Clavier Room will be 1 ¼”. The edge detail at the outside edge will not be changed from the existing condition.

The proposed alteration to pitch floorplates and roof plates will have an effect directly on the Netherlands Carillon. The floorplates have been replaced in the past so this alteration does not involve any loss of historic material. There is no documentation that the roof plates were replaced previously, however, they were coated in the 1995 rehabilitation with a fiberglass reinforcing mesh. The checkered plates at the floors are deteriorated and will be replaced in‐kind with galvanized steel checkered plate.

The rehabilitation work is preservation maintenance. The alteration to pitch the floor and roof plates will help to preserve the resource by mitigating ponding water and water infiltration into the structure.

The resulting sloping of plates and rise in 1 ¼” at the stair core and Clavier Room will be discernable from the Observation Decks. The pitched plates will create hips and a different layout of plate from what currently exists. These details will not be noticeable to the casual observer. The slope of the roofing plates of the soundboard will not be discernable from afar and will not be visible from the memorial itself. The two existing flush steel doors into the Clavier Room will be replaced. The existing doors are corroded, and one is not operable. The creation of a raised floor to pitch the floor plates for drainage also requires shortening the doors by 1 ¼” which is not feasible with the existing doors. The existing operating hardware will be salvaged and refurbished, and the other details of the doors will match the original.

The structural frame requires reinforcement at the eight columns regardless of the additional weight being added to the tower. The additional reinforcement will be within the built‐up box‐columns and will not be visible. Please refer to Structural section on page 30.

The current project consists of the following elements to rehabilitate the tower:

GWMP 214371 Final Schematic Design Page ‐10

Steel cladding

Remove 100% of steel panels for treatment of all faces including interior and bell chamber panels. Document panel markings and locations for reinstallation.

o Contractor to submit plan for tracking panels during restoration so that panels are reinstalled in the original locations.

Remove supplemental 3” base trim at base of memorial and 12” base trim at base of Clavier Room exterior. (Trim is not original to structure and was only applied to disguised corrosion. Full base panel included in replacement.)

Transport to a controlled paint workshop Remove paint with Ultra High Pressure (UHP) water jetting and clean off corrosion from all surfaces, including backs as required to remove overspray. If not immediately followed by metalizing the surfaces should be first coated with a flash rust inhibitor followed by a brush blast cleaning at the time of metalizing.

A zinc metalizing spray should be applied to all faces of the panels (fronts, backs and edges). (Metalizing spray thickness at panel markings should be similar to existing.)

Replace highly deteriorated panels with new metalized steel panels to match existing. Stamp replacement units with “Replaced”, as well as year or contract number.

o Minimum permissible section loss percentage of 15% in panel thickness will trigger replacement.

o Quantity of panels to be replaced: 104, sizes vary Panels which show less damage should be faired with bulked epoxy fills and sanded to match adjacent surfaces. Holes from abandoned electrical lines should be filled with welded plugs using the same alloy as the substrate.

o Epoxy fills: Assume 50 – 4 square inch fills o Welded plugs: Assume 10

The zinc metalizing treatment (flame process) should be followed by a Tnemec high build epoxy barrier coat and either an aliphatic urethane or fluorinated topcoat of the specified color. This system should be applied to all exposed faces of the steel as well as edges and will require stripe coating at edges.

o Previously approved paint color is “Hematite”. (Munsell Ref. 5BG2/1) Satin finish.

o Prepare mockup to ensure that metal panels with metalized and coated edges will fit together. (Coating at edge approximately 1/64”. 1/32” total at each joint. Vertical joints will not be a problem, but horizontal joints over the height of the tower may cause existing panel holes not to line up.)

Each panel to be measured prior to paint removal Finished dimensions to remain the same.

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Panel edges to be run through sander if mockups determine that dimensions will grow from existing prior to metalizing and coating.

Reinstall cladding panels with stainless steel fasteners (1/2” roundheaded machine screw with slot) and neoprene gasket spacers.

o Provide new fastening plates at intermediate panel to panel connections in stainless steel to match existing. (See Figure 11) o Field paint anchors and touch up panels as required after installation.

o Option to cut each panel perimeter enough to allow the introduction of a waterproofing joint that can provide a seal at these joints was dismissed from consideration. Alternative design ideas included a plastic fin which could be attached to the top of each panel at the back but the attachment detail and the possibility for it to also hold water was discounted from further research. The sloping of top plates and weeping of bottom plates will be used to mitigate deterioration from water infiltration.

Reslope flat metal panels at tops of box‐beams to provide slope away from the structure. Provide stiffeners to prevent ponding. Refer to details on A‐5.0 and A‐5.2 for additional information.

Quantities to be replaced. Assume a plate thickness of 3/16”.

o Total quantity of vertical cladding panels: 972 (104 to be replaced);

sizes vary o Total quantity of cladding panels forming top horizontal: 60

To achieve sloping of top panels and coverage of side panels all top panels will require replacement in order to be sized properly to cover joint.

Stainless steel lettering attached to cladding panels: (See Figures 12, 13, 14, 15) o Remove lettering during disassembly of steel cladding. Letters are mechanically attached to the panels with screws or rivets from the back.

o Tag and document location and layout of lettering.

o Remove paint from surface and repolish lettering prior to installation.

o Confirm attachment details.

o Reinstall lettering as cladding panels are reinstalled.

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Figure 11. Existing panel to panel fastening plates.

Figure 12 East Elevation lettering

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Figure 15 East facing interior elevation lettering.

Figure 14 West Elevation South Column lettering. Figure 13 West Elevation North column lettering.

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Ceiling panels

Due to the losses and scale corrosion many of the ceiling and soffit panels will require replacement. See recommendations above for treatment of steel cladding.

o Quantities:

Soffit panels at structure: 96; replace 50 Field panels: 50; replace 18

Provide passive ventilation through installation of venting and weep hole elements in all cladding enclosed elements.

o Drill ½” weep holes in new ceiling and soffit panels. Drill ½” weep holes in existing ceiling and soffit panels where none currently exist. See drawings. Metalizing treatment should coat all exposed edges and surfaces of weep hole.

The supplementary angles that were added in previous work campaigns to the ceiling edge and that are corroded should be removed and not replaced.

Refer to drawings A1.2 and A2.4 for additional information.

Steel frame

Wire brush clean to bare metal all structural steel elements to remove surface corrosion and rust scaling deposits. Evaluate for signs of section loss.

o Quantities: For pricing, assume 25% of all superstructure elements will require rust cleaning

Reinforce all areas where rust scaling has compromised the section and structural properties of the existing structure. Reinforcement shall consist of field welding new galvanized steel reinforcement sections to the existing compromised steel sections.

o Quantities: For pricing assume that 50 such repairs will be required.

o Minimum permissible section loss percentage of 5% will trigger reinforcing.

Coat with a zinc metallizing spray wherever the existing galvanized coating has failed.

o Quantities: Assume that 50 such repairs will be required. (Assume area of 6” X 6” for each repair.)

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Visually observe existing box‐ beam to box‐column connections. Tighten all loose nut and bolt hardware.

Execute supplemental field welding where bolt congestion prevents tightening of bolts.

o Quantities: Assume 30 connections o ¼ fillet weld

Reslope concrete infill at the base of all columns to create a minimum slope of 1/8” per foot away from superstructure, taking care to ensure that water has no opportunity to pond against the vertical planes of the structural steel superstructure. All twelve (12) columns bases will require such a repair.

Structural analysis indicates that reinforcing of the eight steel columns will be required at their base for a height of approximately 16 feet.

Reinforcing L2x2x5/16 continuous angles to be welded to the interior faces of each column corner angle, creating a box section.

o The Design Build contractor shall perform testing of structural steel coupons to confirm the alloy and strength.

Checkered plate floor decks, stair landings, and treads

Remove and replace existing checkered plate floor decks.

Remove supporting horizontal steel angle supports as required to facilitate removal of all floor plate.

Provide new ¼” galvanized steel checkered plate floor plate with slope of 1/8” per

1’‐0” to promote positive drainage away from supporting structural steel elements and the center of the Carillon. See Details Sheet A‐5.1.

Figure 16. Existing condition of bolts.

Figure 17 Existing condition at concrete column bases.

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Horizontal steel angle supports supporting the checkered plate will require replacement as well as they are welded to the checkered plate. See structural documents.

The plates should be flashed where they meet walls o Seal‐weld a base molding to wall panels to provide flashing.

o Provide stainless steel cricket flashing at columns where indicated on the drawings.

Replace corroded checkered plate treads and landings at the main stair with ¼” galvanized steel checkered plate.

o Assume 8 landings to be replaced.

o Assume 10 treads to be replaced.

Base scope stair adjustments to reach sloped floor decks at Observation Deck 1:

o At last four treads at main stair remove and reset tread (each approximately 24” x 9 ¾”) to achieve following heights above the existing:

First tread: raise ¼” Second tread: raise ½” Third tread: raise ¾” Fourth tread: raise 1” o At top landing at Observation Deck, raise checkered plate 1 ¼” above existing elevation (Size 24” x 6’‐7”) o Each riser height in stringer between Level 19 and Observation Deck will increase from 7 ¼” to 7 ½”

Base scope to allow for slope floor decks at Observation Deck 2:

o Replace deteriorated checkered plate at door threshold and raise level of threshold.

o Replace doors to Clavier Room at new height.

Remove existing doors (2) including frame. Salvage existing operating hardware and refurbish. Fabricate two new hollow core galvanized steel doors and frames to match existing. Provide new core for deadbolt locking hardware. Install refurbished lever hardware and new hinges. Provide for new steel drip edge over door headers to match existing. Provide new weather‐stripping.

Flooring: Remove existing VCT from floor and floor sound transfer grill. Install sleepers/plywood to raise level of floor 1 ¼”.

Underside of plywood to be painted. Accommodate existing conditions and provide for access doors to sound transfer grills in floor as required. Floor hatch to be flush with level of floor.

Replace with Forbo Flotex Flocked flooring tile (flocked linoleum), or approved equal.

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Existing fin tube baseboard heaters to be relocated at new floor height.

o Wire enclosures at lighting to be removed and reinstalled for replacement of floor decks. Quantity of (8). Wire brush and repaint enclosure.

Coordinate with electrical.

Remove and reset circular stair structure to adjust to raised/sloped deck and Observation Deck 1 & 2. Provide caulk at seam.

Clean to bare metal all existing landing floor plates and stair treads to remain, i.e.

main stair and circular stair.

All floorplates, stair landings and stair treads (including existing to remain) to be painted with sanded paint to increase friction coefficient. Prepare galvanized floorplates to accept paint coating.

o New galvanized checkered plate: Abrasive blast per ASTM 6386 Standard Practice for Preparation of Zinc (Hot‐Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting.

o Confirm compatibility of new coatings over any existing coating that will remain on surface.

Overcoat: Clean all surfaces to be coated. Remove all coatings not tightly adhered to the surface. Feather smooth any edge transitions. Thoroughly and uniformly scarify existing coatings.

o Testing of galvanized coating is recommended to verify SCOF. (SCOF varies from 0.3 to 0.5 for galvanized steel without a coating.)

o The final floor treatment shall achieve a SCOF rating of 0.60 or greater.

Spot Prime Coat: Tnemec Series 118 Unibond Mastic applied at 6.0‐

8.0 mils DFT or approved equal.

Full Prime Coat: Tnemec Series 118 Unibond Mastic applied at 6.0‐

8.0 mils DFT or approved equal.

Finish Coat: Tnemec Series 290 CRU applied at 2.0‐3.0 mils DFT or approved equal. * Glass beads shall be incorporated into the finish coat to achieve the desired slip resistance.

Paint all surfaces of stair including stringers and stair framing with high performance coating.

Existing railings to remain

Remove railings to access and remove steel panels, floorplates and landing plates.

o Tag railing components prior to disassembly.

Clean all railing elements to bare metal to remove paint, surface corrosion and rust scaling deposits. Reinforce railing members where significant section loss has occurred compromising the structural integrity of the railing system, typically at location where base plate meets floor plate.

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Metalize and paint metal railings in shop with high performance coating to match color of cladding panels.

Reinstall railings.

Refer to Sheet A‐5.3 for additional information.

Open mesh steel ceilings

Remove and replace ceiling panels at Observation Deck 1 with stainless steel press locked open bar grating.

o Remove existing steel ceiling mesh and framing. Remove supporting horizontal steel angle supports and connection hardware as required to facilitate removal of all mesh ceiling panels. Install horizontal galvanized steel angle supports, including straps attached to box beams in bell chamber. Provide new galvanized steel mesh ceiling panels with care taken to ensure steel angle supports are sloped to avoid ponding conditions. New mesh shall be sized for a 40 psf live load.

o See Detail 6/A‐5.2

Open mesh enclosures

Remove and salvage existing open mesh enclosure at circular stair.

Remove and replace corroded base framing at Observation Decks with galvanized steel to match existing.

Wire brush existing open mesh panels, doors, and framing to remain at enclosures, including open mesh hoppers above entrance gates.

Provide locks at the existing doors at circular stair to restrict access.

Repaint mesh enclosures and doors to match cladding color.

Vents

Relocate vents at base box beams so that they are clear of internal framing Add vents in inconspicuous locations to increase ventilation of box beams and wall segments.

o Assume addition of six vents and relocation of four vents.

o Vents to be stainless steel, painted with same coating as on cladding.

o Size: 10” high x 1’‐6” wide; to match existing o Provide insect screening o Clean, paint and add new screening to existing vents; quantity of existing vents is 18.

Louvers

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Remove existing fiberglass louvers and framing to access and treat cladding and structural frame.

Paint louvers to match cladding and reinstall on new galvanized steel framing with new painted mesh as shown in Detail 2/ A‐5.1.

Entrance gates and fencing

Remove existing paint coatings and clean to bare metal.

Repair and treat corrosion at the flat panels in the overgate.

Wire brush clean and repaint existing mesh hoppers.

Paint the gates and fencing with high performance coating to match cladding panels.

Refinish existing iron hardware catch to hold gate open.

Provide a magnetic lock at the gate with push‐button release at interior. Locate button to prevent operation from outside. Exterior operation by prox card or key.

Soundboard Roof

Remove existing checkered plate roof plates at soundboard.

Install new galvanized steel checkered plate, pitched to drain water away from center of roof 1/8” per 1’‐0” as shown in plans. See structural framing plans for additional structural members required; and details on Sheet A‐5.2.

Clavier Room Roof

Remove existing corroded metal tracks and vented hoods at existing sound transfer grilles in roof. There are two hoods and four tracks to be removed.

Verify framing in roof structure is adequate to support 40 lbs. psf live load at infilled openings and provide supplemental framing as required.

Infill openings in roof with galvanized steel panel 3/16” welded in place. Maintain or recreate pitch pocket at cables down to console.

Remove supplementary steel channels at roof and steel bell support frame. Provide new galvanized steel infill panels at holes.

Figure 18 Existing tracks and hood to be removed.

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Clavier Room Glazing

Remove exterior sealant at existing Clavier Room windows. See Hazardous Materials Report and Asbestos Abatement specification DB F2020.

Replace exterior sealant at existing Clavier Room windows.

Bell Signage for Section 106 Mitigation

DB Contractor to provide 10” x 7” bronze plaque mounted to the inside face of the south door of the clavier room noting the additional bells added to the carillon as part of the required Section 106 mitigation. Plaque to be similar to Franklin Bronze Plaque (16078) with single line border and brown patina background. 400‐450 characters including spacing; No images.

Page ‐21 GWMP 214371 Final Schematic Design

Work under separate contract – Work to Bells

Bells: Work on bells is expected to begin during Design. All work related to the bells will be carried out under a separate contract. The following is provided for information.

Reference to Bells Contractor below refers to the contractor retained by the Embassy of the Netherlands.

DB Contractor to coordinate with Bells Contractor. Work under separate contract to include the following:

Note: As part of the means and methods for removing the bells, the Bells Contractor will be responsible for temporary support of the bells. The Bells Contractor shall submit signed and sealed shoring drawings and calculations by a Professional

Engineer licensed in the Commonwealth of Virginia. The calculations shall review the load of each bell as it is moved through the structure and in turn the ability of the adjacent structure to support the moving loads. The calculations shall also review the lateral stability of the structure with removal of any structural elements at the Lower

Bell Chamber.

Bells Contractor to provide and operate crane for the removal of bells.

Operator and rigger for two days.

Bells Contractor to provide interior scaffolding on observation decks and within bell chamber to access bells. (This access will be needed before full scaffolding access for architectural rehabilitation work is required.)

Bells Contractor to remove ceiling mesh and channels temporarily to access bells; Coordinate new mesh installation with the installation of refurbished bells.

Bells Contractor to remove section of Observation Deck guardrail temporarily during removal of bells and reinstallation of bells.

Bells Contractor to provide a secure temporary platform in the bell chamber for removal and reinstallation of bells.

DB Contractor to allocate space for containers and tools for Bells Contractor.

Disassembly of bells and related equipment will be by Bells Contractor.

All existing abandoned framing (e.g. swinging bell frames elements) shall be removed by Bells Contractor.

Hoisting of bells and related equipment will require coordination by DB Contractor and Bells Contractor.

o Bells Contractor will transport bells to the Netherlands for cleaning and retuning. Additional bells will be cast to raise memorial to a ‘Grand Carillon’ o Bells Contractor will transport the bells back to Arlington for installation.

o Bells Contractor will provide additional operating equipment and console.

o Bells Contractor will manufacture a new umbrella rack that needs to be placed on top of the Clavier Room. This umbrella system will be installed in

Page ‐22 GWMP 214371 Final Schematic Design cooperation with contractor. Coordination with waterproofing at roof of

Clavier Room will be required. Bells Contractor will be responsible for painting steel framing for new umbrella rack.

o Bells Contractor will manufacture and install new framing for the additional bells and the existing base bells.

o This bell rehabilitation process is expected to take 12 months.

o Bells Contractor will be responsible for remobilizing crane for reinstallation. Provide crane with one operator and one rigger for three days.

DB Contractor and Bells Contractor in coordination will work to hoist bells and related equipment into the carillon.

o Bells Contractor will assemble and install related equipment once they have been hoisted into place.

Bells Contractor will be responsible for closing openings made in ceilings or guardrails after the completion of work.

Bells Contractor to dismantle accessory scaffolding used for reinstallation of bells.

Bells Contractor to provide permanent ladder rungs and intermediate platform at upper bells as well as OSHA Safety tie‐offs for future access to bells. This will be a delegated design. The Bells Contractor shall submit signed and sealed engineering drawings and calculations by a Professional Engineer licensed in the Commonwealth of Virginia.

GWMP 214371 Final Schematic Design Page ‐23

Option 1 –Roofing membrane

The addition of a liquid applied roofing membrane to the new sloped soundboard roof plates and Clavier Room Roof will provide a waterproof surface alleviating the infiltration of water through the joints of the galvanized steel plates. It will also extend the corrosion resistance of the base material. This system was selected because of its compatibility with existing metal surfaces and its low profile. The edge detail of the membrane will require development in the DB phase. The edge detail must comply with the Secretary of Interior’s Standard for Treatment of Historic Properties. Warranties may be subject to the overall square footage and final detailing.

Soundboard Roof

The checkered plate should be prepared to receive a liquid‐applied membrane roof system, including a primer compatible with substrate, membrane, and coating. The final color should match the exterior panel color. Basis of design – Kemper System.

Prepare existing metal to receive roofing system.

Roofing system shall include a liquid‐applied membrane roof system, including a primer compatible with substrate, membrane, and coating. The final color should match the exterior panel color. Basis of design – Kemper System.

Figure 19 Detail of Option 1 liquid applied membrane at soundboard roof.

GWMP 214371 Final Schematic Design Page ‐24

Future Work:

The following options were considered throughout the Pre‐Design and Schematic Design phases but were not included in the final Schematic Design scope of work. These scope items were presented for concept review by CFA and NPCP and placed on a consent agenda. These items were also reviewed by the Virginia Department of Historic Resources without comment and are included in an Assessment of Effect Report. Please refer to the Value Analysis Study for further discussion of the decision‐making process for the options below.

The proposed change to the Observation Deck guardrails included reducing the open spacing between pickets in order to meet code requirements. The current spacing is 5 ½” and the code requires that the pickets be spaced so that a 4” sphere cannot pass through. During the CBA process, the addition of a 3/8” diameter intermediate picket between the existing pickets was the preferred option. This option would have preserved the original materials and was selected for that reason, as well as cost. However, consultation with and review by the CFA indicated a preference for respacing the pickets at 4” with all other components to match the existing. While preservation of the top rail is possible, the feasibility of salvaging and rewelding the existing pickets is unlikely. The design preferred by the CFA is more in character with the original design intent and preserves more open space within the railing, which will be more in keeping with the existing character, affecting both its appearance from the ground, at a distance, as well as from the observation decks.

The main stair is in the central core of the carillon and rises from the plaza to Observation Deck 1. The proposed change to the stair and railings included alteration of the stair configuration at the top four flights to provide a 36” wide stair; modifications to the existing outside railings with the addition of mesh panels and guardrails; and replacement of the interior handrail to match outside handrail with modification and guardrail.

The proposed change to the entrance gates included the installation of painted stainless‐steel mesh panels on the inside face of the existing steel gates and fencing at the base of the stair within the central core of the memorial to increase security. The mesh hoppers above the gates were added for security prior to 1983 and are not considered to be part of the original construction.

Option – Improvements to Stairs and Railings (Not part of Final Scope)

At Observation Deck railings, salvage top railing and provide new galvanized steel pickets to match existing with 4” spacing between pickets, painted.

Provide new galvanized steel pipe guardrail at 42” for guardrails at the top of main stair. Provide continuous powder coated stainless steel mesh panels in low‐profile channel frames below. Coordinate existing railings to remain with new guardrails at stair.

o Stainless steel mesh, similar to Bankerwire L‐62, powder coated Provide powder coated stainless steel mesh panels at existing stair outside railings o Add galvanized steel guard rail at 42”

GWMP 214371 Final Schematic Design Page ‐25 o Remove railings to install mesh and reinstall.

Provide new continuous internal stair metalized steel handrail with powder coated stainless steel mesh infill panels and a 42” guardrail.

Install metal riser panels at all risers o Stainless steel perforated metal; slot pattern

Option ‐ Stair Reconfiguration (Not part of Final Scope)

Reconfigure the top four landings and stringers to achieve a minimum 36” width with improvements to the railings, treads, landings and open risers of the stair as described in Option above. Landings 17, 18, 19, 20 to be removed and replaced.

Remove top section of wide flange column for stair reconfiguration and provide structural support for new stair stringers. See drawing 4/S‐4.1 for typical detail.

Reroute electrical conduit

Option ‐Clavier Room Improvements (Not part of Final Scope)

Ceiling: The existing metal at the ceiling should be prepared and repainted with a compatible paint system.

Glazing: Replace glazing with fixed thermally insulated double glazing (OB: 1/4” PPG Solarban® 67 on Clear Low‐E #2; AS: ½” Air fill; IB: ¼” Clear) Maintain dimensions of original mullions. (See hazardous materials protocol for removal of ACM caulk at existing glazing.)

Walls: The existing metal at the walls should be prepared and repainted with a compatible paint system. Holes in metal walls at locations of previous equipment locations should be filled with bulked epoxy and sanded smooth.

Acoustics: Provide louvers in side walls of Clavier Room and at interior face of bell stage above the roof so that the carilloneur can hear upper bells. (The louvers will effectively be transfer grilles to allow the sound to move from the bells into the room.) Grill size approximately 15” x 15” stainless steel frame and mesh.

Maintain the access hatches in the floor to hear the lower bells. Clean and repaint grills. Other noise generated by the equipment will be resolved with the new operating equipment.

Miscellaneous: Provide roller solar shades at glazing. 10% or greater openness (translucency);

Gray.

The mechanical and electrical scope of work for the memorial was included with this option. As part of this scope, the existing air conditioning window unit was to be removed. This would allow restoration of the appearance of the original mullion and glazing design.

GWMP 214371 Final Schematic Design Page ‐26

The proposed HVAC system would be a ductless split system which includes a ceiling mounted terminal unit in the interior which is connected to an outdoor unit. The outdoor unit would be mounted on the Observation Deck. Better management of condensation will result in less corrosion of the Observation Deck floor plates. When implemented, the exterior HVAC unit will be visible from the Observation Deck but will be no more visually obtrusive than the existing window unit. Due to sightlines, it will not be visible from the grade level at the Park. The unit will not be screened as adequate maintenance clearance are required around the unit.

Option ‐ Circular stair improvements (Not part of Final Scope)

Circular stair railing: The existing is to remain. Paint existing and add a guardrail at 42”. Wrap stainless steel mesh around outside to a height of approximately 36”.

Option ‐ ‐Entrance gates and fencing (Not part of Final Scope)

Add stainless steel mesh at gates to prevent pass‐through security concerns.

Option Plaza (Not part of Final Scope)

While it is not possible to make the tower accessible without destroying its historical integrity, the plaza must remain fully accessible by maintaining an even and smooth surface for wheelchairs to circulate throughout the plaza and the base of the memorial. Future interpretation and exhibits may be located within the base of the tower structure and will require access.

Future improvements to the plaza will include replacement in‐kind of broken slate pavers. The pavers will be re‐grouted. The perimeter wall scope of work will include crack repairs and replacement in‐kind where the existing basalt stones are severely deteriorated. All sealant joints are deteriorated and will be replaced. The bronze lions will be anchored to the perimeter wall, cleaned, and waxed.

The pavers are not original to the plaza. The original pavers were identified as quartzite sourced through Rotterdam. All proposed work to the plaza is preservation maintenance and will result in no visual changes from the existing conditions.

Plaza Pavers

Remove deteriorated slate pavers.

Replace cracked, split, broken, and white pavers with new Vermont slate to match existing.

GWMP 214371 Final Schematic Design Page ‐27 o Quantities: Approximately 135 units.

Grout pavers 100%.

o Existing ½” joint width to be maintained. Set grout flush with the top surface of pavers to provide a smooth and even surface.

Replace sealant at plaza expansion joints.

Replace sealant joint at base of memorial at perimeter of all walls.

Replace cracked Virginia Mist granite pavers at edge of entrance to plaza. Reset all pavers to reduce lip of pavers to less than ¼”.

Plaza Perimeter Walls

Provide injection…