Attachment 1 - Techincal Specifications.pdf

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Embassy of The United States of America

Rome, Italy

U.S. EMBASSY ROME

ELEPHANT STAIRS WALL REPAIR

Facility Management

01/23/2025

SENSITIVE BUT UNCLASSIFIED

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1 FOREWORDS

2 GENERAL

Art. 2.1 DEFINITIONS

Art. 2.2 SAFETY STANDARS

Art. 2.3 DESCRIPTION OF WORK

Art. 2.4 LIMITATIONS

Art. 2.5 MATERIAL EQUIVALENTS

Art. 2.6 TENDER DOCUMENTS

Art. 2.7 QUALIFICATION OF OFFERORS

Art. 2.8 SUBMITTALS DESCRIPTION (SD)

Art. 2.9 RESIDENTIAL SMOKING POLICY

Art. 2.10 CONCLUSION PHASE

Art. 2.11 PARKING

3 SPECIFICATIONS

Art. 3.1 SITE DEMOLITION AND MASONRY WORK

Art. 3.2 BASIC ELECTRICAL MATERIALS AND METHODS

Art. 3.3 PAINTS AND COATINGS

4 MAINTENANCE PLAN

5 MATERIAL SHEETS

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1 FOREWORDS

The Embassy of the United States in Rome needs to award a contract for the conservation of the Elephant stairs wall. Due to the pruning of the climbing plants, it was found that the underlying plaster was detached. The Embassy has already secured by beating and then removing the detached plaster. The wall has to be restored and new plaster redone.

2 GENERAL

HISTORICAL-ARTISTIC REPORT

Urban Planning Context and Verification of Constraints

The staircase in question, now included within the complex of the Embassy of the United States of America in Rome, is in Municipality I of Rome Capital. It is accessible through the guarded entrances on Via Sallustiana and Via Boncompagni.

Fig. 1 ‐ Aerial photo of the former Villa Ludovisi staircase in the American Embassy area in Rome.

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The lot in which it is located is bounded by Via Lucullo, Via Veneto, Via Friuli (now entirely incorporated within the complex and no longer public), and Via Boncompagni. It is identified in the N.C.E.U. (New Urban Building Cadastre) of Rome as sheet 472, parcel 93.

Fig.2 Cadastral map extract

The entire complex falls within the Settlement System: Historic City – Special Buildings and Complexes - Isolated Special Buildings of Historical, Architectural, and Monumental Interest as defined in the New General Regulatory Plan of Rome Capital (Articles 36-41 of the Implementation Technical Standards) (Fig. 3):

"These are contemporary special buildings and complexes, often constructed to serve major functions and public services, recognized as elements of architectural and urban quality with a character of autonomy and exceptionality compared to the urban fabric in which they are located."

For this type of building, the following categories of intervention are permitted:

Ordinary Maintenance

Extraordinary Maintenance

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Conservative Restoration

Building Renovation

Fig. 3 Extract from the General Town Plan of the Municipality of Rome Capital.

From the research conducted at the Archive of the Superintendence for Archaeology, Fine Arts, and Landscape of Rome, and as confirmed by the opinion issued by the same authority, the property is not subject to protection under Legislative Decree 42/2004 (Consolidated Law on Cultural Heritage).

The property is protected under the provisions of the National Historic Preservation Act (as amended) and the Secretary of the Interior's Standards for the Treatment of Historic Properties. The historic buildings are included in the OBO List of Significant Properties and the compound is listed in the Secretary of State's Register of Culturally Significant

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Properties.

From the analysis of the documents in the “Carta della Qualità”, it is determined that:

Sheet A: Not affected

Fig. 4 Estratto della Carta della Qualità, sheet A

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Sheet B: Not affected

Fig. 5 Estratto della Carta della Qualità, sheet B

Sheet C: Not affected

Fig. 6 Estratto della Carta della Qualità, sheet C

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In the documents of the PTPR Lazio (Regional Territorial Landscape Plan of Lazio), the area where the staircase is located is classified as:

Table A: Landscape of Historic Centers and Nuclei and the related buffer zone (Fig. 7)

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Table B: Historic urban settlements and the related buffer zone (Fig. 8)

Table C: Properties on the UNESCO World Heritage List (Fig. 9)

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HISTORICAL BACKGROUND

The Complex of the Horti Sallustiani

The area currently occupied by the buildings housing the offices of the United States Embassy in Rome was historically part of the complex known as the Horti Sallustiani.

Located near the Porta Collina of the Servian Walls, the property initially belonged to Julius Caesar. After his death, it was acquired by the historian Sallust, inherited by his nephew, and, upon the latter's death in 20 AD, passed to Emperor Tiberius, becoming part of the imperial estate.

This residence was grand and opulent, and from the Renaissance period until the beginning of the excavations for the construction of the Ludovisi district, it was depicted in maps of Rome, such as those by Leonardo Bufalini in 1551 (Fig. 10), Leonardo Paciotti in 1557, and Giovanni Antonio Dosio in 1561.

Fig. 10 Bufalini's plan of Rome: detail of the area where Palazzo Grande was built first, then Palazzo Margherita and the other buildings which are now part of the complex of the Embassy of the United States of America (Frutaz 1962, II, Plate 196).

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Recently, a plan of the Horti Sallustiani has been reconstructed based on excavations and findings (Fig. 11). Among these discoveries is a cryptoporticus decorated with paintings, likely dating to the second half of the 1st century AD, uncovered in the garage of the United States Embassy, on the Via Friuli side.

Fig. 11 P.Innocenti, M.C. Leotta, Plan of the Horti Sallustiani (Benocci 2010, p. 4 fig. 1), with indication of the area.

The Villa Ludovisi Complex: The Annexation of the Orsini Vineyard

The importance of the Horti Sallustiani remained constant over the centuries. These locations were characterized by stunning landscapes, healthy air, and numerous archaeological remains. They were highly sought after for vineyards due to their protection from urban modifications led by Popes Nicholas V (1447–1555), Julius III (1550–1555), and Gregory XIII (1572–1585).

By comparing Du Pérac's view with subsequent depictions, it becomes evident that only the largest structure remained, albeit significantly altered with additional bodies and structures, while the smaller constructions were demolished. This site later became home to Palazzo Piombino (later renamed Palazzo Margherita), the two villas that today house the Chancery and the United States Embassy to the United Nations, and the building currently used for recreational activities and services.

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The villa was originally owned by Cardinal Flavio Orsini (1520–1581), who expanded it by purchasing additional land. On September 13, 1562, it was sold, along with other properties, to his brother Virginio (+1575). Later, it came into the possession of Virginio’s youngest son, Giovan Antonio (1571–1639), who sold most of it to Cardinal Ludovisi.

On February 9, 1622, Alessandro Ludovisi was elected Pope, taking the name Gregory XV in homage to Gregory XIII Boncompagni, who had supported and favored him.

Cardinal Ludovico Ludovisi, nephew of Pope Gregory XV, initiated the creation of Villa Ludovisi near Villa Borghese. That same year, he acquired Villa Orsini, expanding it with adjacent properties.

The result was a 30-hectare estate between Porta Pinciana, Porta Salaria, and the Convent of Sant'Isidoro. Its buildings were designed by Domenichino. The gardens, at least partially, are attributed to Domenichino, although later authors credit them to the architect of the Palace of Versailles. The Tempesta map of 1593 and the Greuter map of 1618 document this transformation.

Fig. 12 Conrad Lauwers, Plan of the Villa Ludovisi, 1650.

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The Late 19th-Century Subdivision and the Construction of Palazzo Piombino (Later Palazzo Margherita)

Following the death of Prince Antonio Boncompagni Ludovisi on July 10, 1883, Prince Rodolfo Boncompagni Ludovisi undertook the subdivision of the villa between 1885 and 1889. This subdivision was facilitated or, at the very least, not hindered by the Municipality and the State. It resulted in the destruction of a complex of exceptional value, recognized throughout the European cultural and economic context.

After a series of negotiations, Prince Rodolfo of Piombino, to expedite the process, purchased the ownership shares from the other heirs and commissioned engineer Francesco Settimi to draft the subdivision plan for the villa (Fig. 13). The new neighborhood was approved by the Municipal Council on February 12, 1886, and an agreement was established with the Società Generale Immobiliare regarding the road arrangements for the new Ludovisi district.

Fig. 13 Francesco Settimi, Development plan of Villa Ludovisi (Benocci 2010, p. 300 fig. 157).

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Fig. 14 Francesco Settimi, New Villa Ludovisi neighborhood (Benocci 2010, p. 301 fig. 158).

The real estate crisis of around 1890, triggered by the closure of the Banca Romana, led to the collapse of all land construction institutes financed by that bank. This caused a significant shock and the downfall of invested assets, including the financial position of the Prince of Piombino.

Fig. 14 Gaetano Koch, Plan of the area of the Great Palace before the transformation (1886) (Benocci 2010 p. 310 fig. 167) where a staircase appears that connects two different floors: the Triton fountain and the ground floor of the building.

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"On March 17, 1886, the Prince commissioned Koch to proceed with the construction of the new buildings. The prepared project was submitted to the municipal authorities for approval. In September 1886, Koch, on behalf of the Prince, signed an application to the mayor of Rome for the construction of 'two villas and a new palace in Villa Ludovisi, owned by him, and [to be allowed] to expand and restore the existing building.'

Three drawings were attached to the application:

1. 'Project for the redevelopment of Villa Ludovisi, property of His Excellency the Prince of Piombino,' Scale 1:500 (pen on paper, 27x40) (Fig. 15),

2. A plan of the area of interest,

3. The modified design of the old Palazzo Grande to incorporate the new building on one side, the two villas in the area facing the old main façade of the Palazzo Grande, and the family casino, with the gallery reduced and transformed."

Fig. 15 Gaetano Koch, «'Project for the redevelopment of Villa Ludovisi, property of His Excellency the Prince of Piombino,' Scale

1:500», September 1886, Rome (Benocci 2010, p. 306 fig. 164).

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Fig 17 Gaetano Koch, General plan of new Villa Boncompagni Ludovisi, 1889.

As previously mentioned, the construction work was completed in 1890, during a period of severe financial and economic crisis. After receiving the certificate of habitability on March 17, 1892, and finalizing payments in June 1892, the family was forced to transfer the property to the Bank of Italy, a creditor of the Prince.

Following Queen Margherita's death in 1926, the Administration of the Royal Estate sold Palazzo Piombino in 1928 to the National Fascist Confederation of Farmers, one villa to the Immobiliare della Regione Lazio, and the other villa to the National Fascist Party.

Initially, the Government of the United States of America rented the two villas. Later, in 1946, it purchased the entire complex, which became the headquarters of the Embassy to the Italian State. From that point onward, numerous modifications were made to adapt the complex to its new function1.

1 The American Government purchased the old Chancery and Consulate, along with the associated property, from the King after World War I, likely around 1930. Villa Margherita was subsequently acquired by the United States Government in 1946 (deed executed by Notary Urbano on August 3, 1946) during the tenure of Ambassador Kirk. This information is documented in the Archive of the Superintendence for Architectural and Landscape Heritage of the Municipality of Rome, in the folder titled "Palazzo Margherita," subfolder "1940–1981."

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Between 1948 and 1951, architect Mario De Renzi, commissioned by the American Embassy, added a new wing to the rear façade of Palazzo Margherita. This involved additional demolitions of the older Palazzo Grande, as can be seen in the floor plan dated 1951 (Fig. 16). Despite this, the architect showed sensitivity by drawing inspiration for the new addition from the Doric style of the columns and pilasters of Palazzo Piombino.

The floor plan also highlights the current building, whose footprint matches its present layout.

Fig. 16 Plan of the area of the Embassy of the United States of America,1951 (Schiavo 1981, fig. 167).

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BIBLIOGRAPHY

BARBERINI G., 1998, Guide rionali di Roma. Rione XVI Ludovisi, parte quarta, Roma.

BENOCCI C., 2010, Villa Ludovisi, Roma.

BROGGI L., 1909, Le residenze di S.M. la Regina Madre d’Italia, Margherita di Savoia, Bergamo.

BRUNORI V., 2006, Serata d’arte a palazzo margherita. Una passeggiata attraverso la storia e la collezione d’arte dell’ambasciata degli Stati Uniti d’America a Roma, Roma.

CARUNCHIO T., 1981, De Renzi, Roma.

DE ANGELIS d’OSSAT, 1942, L'architettura in Roma negli ultimi tre decenni del secolo XIX, in Annuario reale insigne

Accademia di S. Luca, Roma.

DI MARCO F., 2004, Gaetano Koch, Dizionario Biografico degli Italiani, vol. 62.

FELICI G., 1952, Villa Ludovisi, Roma.

FRUTAZ A.P., 1962, Le piante di Roma, I‐III, Roma.

MISURACA G., 1901, Il nuovo palazzo reale Regina Margherita in «Edilizia moderna», X, 2, pp. 9‐11.

NERI M.L., 1992, Mario De Renzi. L’architettura come mestiere 1897‐1967, in «Bollettino della Biblioteca della

Facoltà di Architettura», 46.

RESTUCCI A., a cura di, 2005, Storia dell’Architettura Italiana. L’Ottocento, Electa, Milano, pp. 279‐281.

SCHIAVO A., 1981, Villa Ludovisi and palazzo Margherita, Roma.

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PHOTOGRAPHIC DOCUMENTATION

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Given the historical significance of the site, before drafting the project, a diagnostic campaign was conducted to study the mortars and plasters on the retaining wall, as well as its thickness, geometry, and structural characteristics.

Investigations Conducted:

Plaster samples were collected for laboratory analysis, including thin and polished sections, to examine the type of aggregates, their granulometric distribution, the inert/binder ratio, and their condition. Where necessary, X-ray diffraction (XRD) and FT-IR spectroscopy were performed to characterize the composition and peculiarities of the mixtures.

Core samples were taken to document the thickness, composition, masonry type, dimensions of the blocks, and geometric pattern, ensuring statistically significant sampling.

Findings:

Petrographic analysis of thin sections revealed a slight stratigraphy, primarily attributable to surface weathering agents, oriented transversely to the wall.

o This stratigraphy is indicated by a color variation, with gray tones from the surface layer of the sample. The depth varies between approximately 1 mm and 5 mm, transitioning to lighter gray and pinkish tones below the first layer.

Aggregates: Observed as volcanic lithic material with grain sizes below 4.0 mm, ranging from sub-angular to sub-rounded. Their orientation is isotropic with regular distribution.

Binder mineralogy: Identified as calcium-sulfate and carbonate-based.

X-ray fluorescence (XRF) analysis provided the concentration of elements, as detailed in the attached tables.

This diagnostic work is essential to develop appropriate intervention methods that respect the historical and structural integrity of the retaining wall and staircase.

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The proposed interventions adhere to the principles of modern restoration, prioritizing the respect for historical material and authenticity. The methodological approach follows the principles of minimal intervention, reversibility, distinguishability, and the chemical-physical-mechanical compatibility of new materials with those on-site.

Intervention strategy synthesis

Plaster Conservation

Masonry Repair (“Cuci-Scuci” Technique)

Staircase Maintenance

Elimination of Degradation Causes

All the following is to be understood as "minimum required performance" and, therefore, does not release the Contractor from all its own and wider responsibilities concerning both compliance with the National and International regulations applicable to the case, and the adoption of technologies more suitable for achieving the best manufacturing and management quality standards.

Participants are obliged to carry out an inspection of the site subject to the intervention, and to take the final measurements and as regards the success of the project, since the Contractor himself is responsible for discrepancies and deficiencies.

It shall be Contractor's responsibility to verify all the quantities and dimensions.

The Contractor is fully responsible for any damage caused by its own actions or of its employees to people and / or things.

The Contractor shall supply all the installation materials and equipment, skilled and unskilled labor, technical supervision, as well as logistic and administrative support.

The contractor shall also supply all accessory services such as: transportation, leasing, equipment and tools, disposal of debris, cleaning the work area and anything else necessary to complete the project in compliance with the present specifications.

The contractor shall provide a safety plan designated for this project.

Maximum attention is required for the safety of personnel at work on the site. The workers shall operate in compliance with standard codes. Since the work site consists of crucial technical installations, temporary safety protection measures towards third parties and workers shall be installed with care and attention, especially for the hours when site is closed.

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The Contractor shall be responsible for submitting, for approval by the COR, samples of materials and supplies to be used.

In the event of discrepancy between the various drawings of the Project, will have value the solution that best fits the purposes for which the work was designed and, in any case, the one that best meets the criteria of reasonableness and good executive technique applies. In case of discrepancy between the drawings and the items in the Bill of Quantities, the choice of the realization of the workings will be the most favorable for the Embassy.

Working hour will starts from 08:00-08:30 AM thru 5:00-5:30 PM during weekdays.

Due to the nature of the workplace, there will be workings to perform out of the normal working hours. These operations shall be preventively and beforehand discussed with the COR, in order to obtain the right approvals and authorizations.

Temporary interruptions in the operation of plants and services must be scheduled with the COR with at least 5 days’ notice.

Tests functions of plants built and deliveries of tranches of completed works will only take place in the presence of the manager of the Contracting Company and the COR. It will be the responsibility of the Contracting Company to draw up the relative delivery reports for all those works and systems performed and subject to verification and acceptance by the COR.

Art. 2.1 DEFINITIONS

A glossary of terms and relative equivalents used in the drawing up of the tender documents are indicated hereunder:

Client, Administration, Project Supervisor, COR, CO: all these denominations identify the technical administrative staff, predisposed to handle the contract on behalf of the Embassy of the United States of America.

Contracting Company, Contractor: all these denominations identify the subject that undertakes to carry out the work described in the contract.

Contract, Purchase Order (P.O.), Work Order: these terms identify the contract document with which the project is awarded. The Client at his indisputable judgment shall make the formal selection of the different types of documents.

For safety plan purposes, the figures of the Embassy that are key elements in the definition

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"RUP RESPONSABILE UNICO DEL PROCEDIMENTO" The Contracting Officer of Tri- Missions Rome, whose name appears in the contract or Purchase Order.

"COMMITTENTE" The Senior Facility Manager of Tri-Missions Rome, whose name shall be communicated after the award.

"RESPONSABILE DEL SERVIZIO PREVENZIONE E PROTEZIONE" and "RESPONSABILE DEI LAVORI" The POSHO (Post Safety and Health Officer) of the Tri- Mission Rome, whose name shall be communicated after award. The POSHO shall perform his/her duties also using an A/POSHO part of his/her staff.

"DIRETTORE DEI LAVORI" The COR nominated by the Contracting Officer after award.

Art. 2.2 SAFETY STANDARS

The contractor must fulfill all the safety legal requirements according to the D.Lgs.

81/2008 Testo Unico sulla Salute e Sicurezza nei Luoghi di Lavoro. The objective is to avoid or in any case to reduce to the minimum the workers’ exposure to risks associated with work activities. Therefore the contractor is expected to deliver the Risk Assessment Document (Documento Valutazione Rischi, DVR) or the Operational Safety Plan (Piano Operativo di Sicurezza, POS) when required, to provide trainings to the laborers, to supply individual and collective protective equipment and to comply with all the other requirements disciplined by the D.Lgs. 81/08.

In the solicitation process set up by the Contracting Officer (RUP), to verify the professional technical suitability, the Embassy asks the offerors a statement on the average annual workforce and on collective bargaining agreement (Contratto di lavoro) applied to employees, the details of the workers' complaints made to INPS, INAIL and Casse Edili.

In the case of private works, no permission from construction and the amount of the work less than € 100,000, the verification of the suitability of the company is simplified and is considered satisfied through the presentation by the company of the certificate of registration in the Chamber of Commerce, Industry e Handicraft and the Single Document of Regularity Contribution (DURC), accompanied by self-certification in order to meet the other requirements set out in Annex XVII of the Local Consolidated Law on Finance.

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The estimate must be congruous, analytical for single items, per unit or per measure.

After the tender closure, the company entitled to the work must submit a detailed Operational Safety Plan (Piano Operativo di Sicurezza) at least 15 days before starting the operations.

The contractor has to send the list of personnel who will work on site. The workers have to be regularly registered and if there is a subcontractor this has to present the documents requested too. All workers have to understand and speak Italian.

The safety plan submitted must clearly identify the professional figures as follows:

"DIRETTORE TECNICO DI CANTIERE" The construction site technical director is the person who manages for the contractor the construction site. This role can be played by both an employee of the company and by an external professional, with a specific and formal assignment. The figure of the technical director of the construction site must not be confused with that of the construction manager, who is instead appointed by the client and checks that the works are carried out in accordance with the provisions of project and related specifications.

"PREPOSTO" an individual who is identified for the functions he/she performs and is therefore comparable to what with other terms is indicated as site manager, workshop manager, department head, office manager, etc. He/she must also be trained to be able to perform the functions attributed to him, as indicated in art. 19 letter g) of paragraph 1 and according to the objectives set by art. 37 of D.Lgs. 81/08. The PREPOSTO, insures continuously and effectively that the workers:

1) follow the safety regulations imparted and outlined in the safety plan.

2) use the required personal protective equipment (PPE).

3) promptly report to the employer or manager any deficiencies in the procedures, tools, personal protective equipment, and persistent protocols disregards.

Art. 2.3 DESCRIPTION OF WORK

The aim of the work is the execution of conservation of the staircase and plaster of the Elephant stairs wall located next to the Cafeteria in the TriMission compound.

The contractor must perform the following preliminary tasks before starting the actual work:

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- Close off the construction site area to ensure safety.

- Install scaffolding with vertical and oblique debris nets to guarantee a safe pedestrian passage.

- Install a dedicated building site electrical panel.

- Create all necessary temporary connections for site use. The Contractor must agree with the COR on the derivation points for the supplies.

- The COR will designate storage and shelter areas for materials, tools and Contractor staff.

- Prepare any additional protections deemed essential by the COR for the safety of people and the protection of goods.

- Protect the Roman period sculpture of a reclining Silenus near the wall with a thin PVC sheet secured with a cord under the masonry basement. Adhesive tape shall not get in contact with the marble. Handling, moving, packing, and unpacking of cultural assets shall be performed by specialized professional firms under the supervision of the U.S. Tri-Mission Rome Office of Cultural Heritage.

- Construct a rigid cage to cover the sculpture and the fountain, using tube-and-joint metal elements, and rigid panels (e.g. plywood, wafer board, etc.) to protect against any potential mechanical and/or chemical hazard.

Since this is a conservation project the following criteria must be guaranteed and followed during its execution:

- Compatibility: The compatibility of the products used for restoration will have to be considered in terms of chemical and physical properties, as well as mechanical and aesthetical characteristics of the historically significant assets’ constituent materials.

- Reversibility: All products used shall be reversible and allow future treatments, even considering the difficulties and sometimes the inappropriateness of removing substances that have penetrated deeply into the structure of the materials.

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- Lastingness: The choice of products will have to be made considering their durability and the deterioration to which they may be subject because of environmental conditions. At the same time, applied products will have to ensure the persistence of optical and mechanical characteristics of the constituent materials in the long term.

1. PLASTER

Removal of loose deposits on the stable and well-preserved portions of the surface is envisaged, avoiding areas that present detachments and decohesion.

Restoration of the adherence between masonry, grouting (arriccio) and the plaster layers by injection of mortar mixtures composed of lime and hydraulic aggregates (such as pozzolana and/or pozzolana ventilate) compatible with the existing, if necessary with the addition of small percentages of acrylic resins emulsions. The injection will be executed after previously filling in fissures and sealing the margins of plaster portions and securing portions at risk of detachment through the application of temporary protective layers (facing) and propping. The operation will be followed by the removal of any products used for the temporary facing and protection.

Consolidation of fissures and fractures and of non-separable layers through the injection of adhesive products, such as acrylic resin in emulsion or hydraulic mortars with ultrafine aggregate (pozzolana ventilate).

Where necessary, disintegrating or brittle plaster and mortar shall be consolidated by means of ethyl silicate or equivalent products applied by brush.

Mechanical removal of residual plant tissues and organs adhering to the plaster and exposed wall surface (such as roots, stems and trunk) avoiding any mechanical stress and any losses to the existing historic materials. it is necessary to carefully check that the water drainage holes are well cleaned of vegetation.

Disinfection from biological organisms and microorganisms, by applying biocides over the entire surface. Once the necessary residence time has elapsed, the surface must be rinsed with water using manual sprayers and sponges until the product and residues are eliminated, avoiding excessively wetting the surface. The operation must be repeated until the complete elimination of biological colonies and biofilms.

Chemical cleaning to remove solid surface deposits, encrustations, concretions, altered products, by applying compresses of chemical solutions or solvent mixtures to be determined upon execution of preliminary spot tests.

After removal of the compress, the surface shall be carefully rinsed avoiding to exceedingly soak the substrate, using spray bottles, sponges and soft bristle brushes.

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Final mechanical removal of solid adherent residues carried out manually using precision tools (scalpels, chisels, micro engravers, etc.), to avoid any damage to the original surface.

Removal of fills performed during previous interventions using inadequate materials in terms of composition and aspect: intervention to be carried out manually by means of mechanical precision tools (scalpels, micro engravers, small chisels, etc.,) including the consolidation and protection of margins and adjacent surface.

Historically relevant metal elements shall be cleaned and treated through the application of products to contrast the oxidation and protect them. For oxidation inhibition products such as tannic acid or Incralac (benzotriazole in acrylic resin) shall be used, depending on the alloy. The application of any products shall be performed after protecting adjacent surfaces.

Modern metal elements, such as pins, brackets, clamps, etc., shall be removed without causing any damage to the structure and grout/plaster layers, including the preliminary consolidation and protection of surrounding surfaces. Shall it be impossible to remove them without causing damage, metal elements must be treated by cutting them down to the level of the plaster, applying the corrosion inhibitor as indicated above, and sealed with an adequate mortar mixture to cover the remaining portion. The application of any products shall be performed after protecting adjacent surfaces.

Filling and micro-filling of fissures, fractures, losses, scales etc., to be performed with inorganic lime-bound mortar mixtures composed of natural aerial lime, pozzolana and salt-free mineral aggregates (sands, stone powders). A minimum of three mortar samples of suitable dimensions shall be performed to determine the most suitable and compatible mixture in terms of color, grainsize, texture and aspect, to be selected in agreement with the COR and SMEs. The preparation of samples will be repeated until obtaining the desired result. Preliminary tests will be executed according to the highest quality standards, followed by careful cleaning of the surface to remove any excess of the mortar.

Large losses will be filled in by applying as many superimposed layers as necessary, the bottom/preparatory layers will be composed of NHL 3.5 lime and pozzolana aggregate, to be sieved to obtain the required suitable grain size. The grainsize of the aggregate shall be progressively thinner from the bottom to the top layer. A minimum of three samples shall be performed to determine the most suitable and compatible mixture in terms of color, grainsize, texture and aspect, to be selected in agreement with the COR and SMEs.

The finish and paint color to be agreed with the Superintendency.

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Stainless steel or other approved non-ferrous nails will need to be installed through the plaster layer and into the masonry substrate wall beyond. Those nails will be integrated into a monitoring system to be performed by others. The monitoring system is necessary to verify that the wall is not exhibiting movement and or displacement. The positioning of the nails shall be within existing mortar joints and be determined in coordination with the surveyor. Efforts will be made to avoid placing the nails on the historic plaster and masonry units as much as possible. Should this become necessary, the installation and removal methods will be studied in agreement with the SME to ensure minimal impact on the historic materials.

The new render shall be compatible with- and reproduce the historic plaster as much as possible in all its characteristics, namely from the aesthetic and chemical-physical points of view.

The new render will be made of custom-mixed traditional mortars, composed of salt-free natural lime (NHL 3.5,) aerial lime (lime putty), and aggregates in proportions 1:2 - 1:3.

The aggregate will consist of properly sieved pozzolana combined as necessary with mineral aggregates (salt-free sands and/or stone powders) to reach the desired consistence, appearance, and physical-chemical characteristics.

The contractor shall hire skilled craftsmanship with demonstrated previous experience in the execution of traditional plasters.

The render shall be performed in two layers, the first consisting of a rougher grout (arriccio), the second of a finer finish.

The first/bottom layer (arriccio) shall be composed of salt-free natural hydraulic lime NHL

3.5 and pozzolanic aggregate. The aggregate shall be sieved to obtain the desired grain-size, which will be coarser than the one used for the top layer. The bottom layer will be applied after thoroughly wetting the wall surface and shall be prepared before complete drying, by incising the surface with the trowel to facilitate mechanical adhesion of the top layer. For the bottom layer, the use of equivalent commercial pre-mixed products with fully disclosed ingredients, well established performance records, excluding eminently hydraulic lime binders (such as NHL 5), may be proposed as an alternative.

The second/top layer (finish) shall be composed of a salt-free aerial lime (lime putty/grassello) and aggregates of the same type and grain-size as the ones used for the historic plaster, including the same type of pozzolana and – if needed – salt-free mineral sands and stone powders (see diagnostic investigations). The aggregates shall be sieved to obtain the desired grain size. The top layer will be applied before complete drying of the bottom layer, no later than 24-48 hours after its completion, depending on the climatic conditions; if necessary, the surface shall be sprayed with water before applying the second/top layer. A minimum of three samples of suitable dimensions (minimum 60 x 60

cm) shall be prepared on a support reproducing the characteristics of the masonry, to determine the most suitable and compatible mixture in terms of color, grainsize, texture

- 32 -and aspect, matching the historic plaster, and to be selected in agreement with the COR and SME. The preparation of samples will be repeated until obtaining the desired result.

The top render will be finished by sponging the surface to eliminate the exceeding lime and expose the mortar components, maximum 12-24 hours after execution.

If necessary and deemed preferable by the COR, Soprintendenza and SME, the surface will be finished with a mineral lime-based paint composed of diluted long-term curated aerial lime (lime putty), natural mineral pigments (earths) and fine mineral aggregates (if needed) to obtain the desired color. For the finishing layer, the use of equivalent commercial premixed products with fully disclosed ingredients, well established performance records, excluding eminently hydraulic lime binders, may be proposed as an alternative. A minimum of three samples of suitable dimensions (minimum 100 x 100 cm) shall be prepared to determine the most suitable and compatible color and appearance, matching the historic plaster, to be selected in agreement with the COR, Soprintendenza and SME. The preparation of samples will be repeated until obtaining the desired result.

All operations will be executed according to the highest quality standards

2. MASONRY

Removal of loose deposits and of accumulated soil on the entire surface showing good conditions, using soft bristle brushes and manual tools, avoiding areas showing structural instability.

Chemical cleaning of the bricks for the removal of solid deposits using water applied by manual spray bottles and soft bristle brushes.

Removal of solid residues, encrustations, and concretions carried out manually, alternating chemical and mechanical means using precision tools (scalpels, vibro-incisors, etc.,) and avoiding any damage to the existing materials.

Restoration of the structural integrity of existing wall elements through the injection of hydraulic mortars between loose portions.

Where necessary, disintegrating elements (such as bricks, tufa blocks, mortar) shall be consolidated by means of ethyl silicate or equivalent products applied by brush. The use of alternative restoration products shall be evaluated in agreement with the COR and SMEs.

Removal of fills performed during previous interventions using inadequate materials in terms of composition and aspect. Intervention to be carried out manually by means of mechanical precision tools (scalpels, micro engravers, small chisels, etc.), including the consolidation and protection of margins and adjacent surfaces.

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Historically relevant metal elements shall be cleaned and treated through the application of products contrasting the oxidation and protecting them (see chapter “Plaster”). The application of any products shall be performed after protecting adjacent surfaces.

Modern metal elements, such as pins, brackets, clamps, etc., shall be removed if the operation can be performed without causing any damage to the structure and grout/plaster layers, including the preliminary consolidation and protection of surrounding surfaces.

Shall it be impossible to remove them without causing damage, metal elements must be treated by cutting them down to the level of the plaster, applying the corrosion inhibitor as indicated above, and sealed with an adequate mortar mixture to cover the remaining portion. The application of any products shall be performed after protecting adjacent surfaces.

Mechanical removal of residual plant tissues and organs adhering to the plaster and to the exposed wall surface (such as roots, stems, and trunk). The operation shall be performed avoiding any mechanical stress to the existing materials and any losses.

The stairs wall has some visible cracks due to the climbing plant penetration. It is needed to repair with the Method “Cuci-Scuci” – “sew - unsew”: As far the repair and reconstruction of the damaged wall, there are many methods in the technical literature, however the most indicated in this case seems to be the "sew and unsew" technique which is a type of traditional intervention and takes place through the restoration of wall continuity with the removal of stone or brick elements, without however breaking the static function of the masonry. This type of intervention cannot be thought of as a widespread consolidation for all those walls that present an overall degradation, usually generated by poor masonry quality, in fact it is usually recommended in those situations that present cracks or decay in areas of walls with a modest extension.

The executive phases provide for the recovery of the material to be used similar in shape and size to those already existing on site. If the material cannot be reused, it will be necessary to proceed with the installation of new elements similar in material, shape, size and strength characteristics to the existing ones. The various phases will be:

1. Remove the part of the masonry (stones and/or bricks) locally degraded and/or damaged, including the original bedding mortar and anything that could compromise subsequent processing, using exclusively manual means without the use of mechanical tools.

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2. Wash the wall facing using low pressure sprayed water.

3. Reconstruction of the previously removed wall segments and replacement of the same using existing stones or solid bricks. The solid bricks or the recovered stones will have to be clamped (on both sides) to the old masonry.

4. The operation is performed starting from the bottom and proceeding upwards.

Creation of new plaster as indicated in the previous paragraph “Plaster”.

3. STAIRS, PARAPET MAINTENANCE AND IRRIGATION SYSTEM

Clean and seal joints between the existing cobblestones on each step of the staircase.

Check and remove detached plaster from the parapet of the stairs, then create a new one based on natural hydraulic lime and pozzolan, with a smooth exterior finish and paint with color matching the existing.

Clean with a low-pressure water and grout the existing travertine slabs on the coping, steps and other parts as necessary.

Remove existing flowerbeds and plants stumps next to the steps, replacing them with travertine slabs for horizontal support surface vases. Place handmade terracotta pots festooned with Pittosporum tobira nanum plants planted in mixed soil of peat and clay.

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Supply and install a new irrigation system with a 20 mm drip line controlled by a 1-zone control unit. Include small grids in the travertine slabs to ensure water drainage.

Perform various completion works such as masonry assistance, minor plaster and paint touch-ups, leasing and removal of scaffolding, debris disposal, final worksite cleaning, etc.

4. ELECTRICAL WORKS

Modify the existing electrical system, including wall tracks, flush-mounted junction boxes and boxes, pipes, cables, and connections.

Supply and install a lighting system for walkways designed for the use of LED light sources to ensure high visual comfort: n.15 Light up Orbit d28 - IGuzzini stainless steel body on travertine slabs on the wall side. Recessed installation, consisting of an optical compartment with IP66 protection rating and wall casing: n.8 IGuzzini Walkys on the other side recessed into the existing masonry to replace the existing lighting fixtures. Optical compartment and base in aluminum alloy with powder painting treatment to guarantee high resistance to atmospheric agents and UV rays. Plastic closing carter in the rear part of the optical compartment. Complete with plastic cable gland and 0.5 m long output cable, case with black plastic frame. Frosted tempered soda-lime safety glass. Luminaire without visible screws with anti-theft model. They must be connected to the existing switchboard, with twilight accent and must refer to the existing system.

All accessories for correct installation are included such as power supplies, plates, electrical cables inserted into anti-rodent tubes, outdoor wells.

Supply and installation of an IGuzzini iPro micro wall LED projector lamp for exterior application aimed to illuminate the statue of Silenus on the fountain adjacent to the staircase. Optical body and frame die cast aluminium with PMMA and thermoplastic lens.

Mounting on wall with directional flap, waterproof IP68 field connector and all accessories necessary to have completed the installation.

5. HANDRAIL

Supply and install a handrail made of heavy-duty steel anchored to the new plinths under the travertine slabs on the wall side of the staircase. Ensure that the handrail complies with the required safety standards in terms of space and heights. The handrail shall be made as per drawings.

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All the material should be of primary brands and samples should be submitted to the COR for approval. All samples should be submitted within 15 days from the notice to proceed.

All the debris from the work shall be loaded and disposed outside the building on the very same day, and only a small internal area will be set up to deposit the material to be installed.

The supply of the materials, as listed in the bill of quantities, shall be fully charged to the contracting company.

At the end of the project, an as built of all the plants must be formulated by the Contractor and the document must be delivered to the COR of the U.S. Embassy.

The contractor shall provide professional cleaning of the premises at final completion of the work.

The contract has to prepare and submit all design details necessary for correct execution of the project (Shop Drawings), before carrying out the work, following the methodology and times determined in the chapter entitled "Times and Penalties".

The contractor will perform also the following:

• Supplying "As Built" drawings (.dwg) of all the work carried out and installation and O&M manuals of all the installed equipment, both on paper (1 copy) and digital media.

• Furnishing instruction and maintenance manuals for all the machinery supplied and installed, placed in box files according to type of system.

Art. 2.4 LIMITATIONS

The accomplishment of the project shall be circumscribed to the specific requests described in the Tender Documents.

Art. 2.5 MATERIAL EQUIVALENTS

The contractor shall verify and ensure that all the materials supplied are new and without defects and that their use and/or installation is carried out using the best techniques and fully respecting the instructions supplied by the manufacturers.

Special parts shall be manufactured solely by workshops that are highly qualified in that

- 37 -specific sector.

The makes indicated in this SOW (Scope of Work) are intended as a point of reference and therefore, the words or approved equivalent are implicit.

Therefore, the makes and products listed are to be deemed equivalent to each other.

Different selections implemented by the Contractor shall be approved in advance by the COR, after submission of samples and technical cards.

Special products must be processed only to workshops highly qualified in the field of specific realization.

All products and materials used shall comply with the technical guidelines and directives generally accepted within the field of cultural heritage conservation. Products and materials must be used and applied as per data sheets.

The use of equivalent commercial products with fully disclosed ingredients, well established performance records, excluding eminently hydraulic lime binders, may be proposed as an alternative and will be evaluated in agreement with the COR/SME.

All products will have to comply with the applicable legislation. National and international technical regulations in force at the time of the contract will have to be observed, although not expressly mentioned in these Technical Specifications (UNI, UNI EN, UNICHIM, CNR, CEI, NorMal recommendations.)

The term “lime” refers to natural salt-free aerial and hydraulic lime, such as lime putty, hydrated lime, and NHL 3.5, to be approved by the COR.

Lights

IGUZZINI

Art. 2.6 TENDER DOCUMENTS

The following documents shall form an integral part of the contract:

The present Special Tender Document

General Conditions in use by the Client

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Drawings AR101, AR102, AR103, AR104.

Bill of quantities

Art. 2.7 QUALIFICATION OF OFFERORS

SOA CERTIFICATION

The offeror shall demonstrate that it meets the project classification requirements (SOA’s certification). The SOA certificate is a qualifying system established by the current Italian laws and implemented through private qualifying agencies.

In the event two SOAs are required, an offeror with the intent to subcontract the effort must have at least one of the SOAs and its subcontractor must possess the other SOA.

The applicable SOA(s) for this project is: OG 2, Cat II

OG 2: RESTORATION AND MAINTENANCE OF THE PROPERTY SUBJECT TO

PROTECTION PURSUANT TO THE PROVISIONS REGARDING CULTURAL AND

ENVIRONMENTAL ASSETS: It concerns the performance of a coordinated set of specialized processes necessary to recover, conserve, consolidate, transform, restore, restructure, maintain the buildings of historical interest subject to protection under the provisions on cultural and environmental heritage. It also concerns the construction of electromechanical, electrical, telephone and electronic systems and finishes of any type in buildings, as well as any related, complementary and accessory works.

RESTORERS QUALIFIED ON MiC REGISTERS

The buildings object of this project is of historical and artistic value, subject to legal restrictions as per Legislative Decree 42/2004 and subsequent amendments. The project described herein will therefore have to be assigned to Restorers of Cultural Heritage possessing the professional qualification required by the Italian Ministry of Culture. The company will have to be specialized in the restoration of cultural assets and architectural surfaces, and will be composed of restorers of works of art, with specific experience in the field of the restoration, namely:

Sector of competence:

PFP 1 Stone materials and derivatives; decorated surfaces of architecture.

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As specified below, the company members will be mainly qualified conservators and hold an executive role within the company.

All conservators and conservator’s assistants, who are members of the company, or recruited for the project, will have to include in the proposal their curricula, the certifications proving their professional qualification in the field of the conservation and restoration of cultural heritage, their professional experience, and specific competences, necessary for the correct execution of the work.

All those who will carry out the work will have to possess the professional qualification as cultural heritage conservator required by the Italian Ministry of Cultural Heritage and Activities, as per Italian law, which is the qualification required by Ministerial Decree 24 October 2001, n. 420 and subsequent amendments (Legislative Decree 22 January 2004,

n. 42 and subsequent amendments, Law 14 January 2013, n. 7 – Amendment of the transitional rules for the attainment of the professional qualification of cultural heritage Conservator and cultural heritage assistant conservator, GU n. 25 of 30-1-2013), as per communication issued in the Gazzetta Ufficiale, Serie generale, del 15 ottobre 2018, n.

240. Therefore, the interested offerors must include in their proposal the curricula of the restores in charge of the execution of the work.

Art. 2.8 SUBMITTALS DESCRIPTION (SD)

Submittal requirements are specified in the technical sections. Examples and descriptions of submittals identified by the…