Ord Weitzel Spec 04 10 00 - Amendment _001 (003).pdf

Ord and Weitzel Gate Reconstruction Arlington National Cemetery Task Order: W91236-14-0028-21

SECTION 04 10 00

EXISTING HISTORIC STONE COMPONENTS ERECTION

11/15

PART 1 GENERAL

1.1 GENERAL REQUIREMENTS

It is the intent of this specification to protect historic stone components to the greatest extent possible. Use the gentlest means to perform the work and take the greatest care to ensure that the historic materials are not damaged in the process of the work. In addition to the requirements in this Section, comply with NPS Historic Properties .

The Ord-Weitzel historic stone components will be erected on top of concrete reinforced piers with a random coursed broken ashlar bond stone veneer. Each column consists of historic stone components, a stylobate, a round base block, six (6) column drums, a capital, an urn pedestal, and an urn. The urn pedestals and the urns are carved from limestone and the stylobates and round base blocks, column drums, and capitals are comprised of Aquia Creek sandstone. The Aquia Creek sandstone is over 200 years old and once comprised the portico to the War Department Building next the White House before it was brought to the cemetery in 1879. All the stone, with the exception of the urns and pedestals, have been limewashed.

Considerable time and effort has been invested to conserve and repair the historic stone components. The manner in which the historic stone components are removed from the storage area, transported to the erection site, staged, lifted and set into place is critical.

Allow concrete to cure 28-days and confirm a 4,000 psi result from a core test sample. The historic stone components shall be constructed atop the concrete reinforced piers. The construction of the wing walls will take place after the erection of the historic stone components.

Refer to related Section 03 30 00.00 10 CAST-IN-PLACE CONCRETE and Section

04 30 00 MASS-MASONRY WALL CONSTRUCTION.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS (ACGIH)

ACGIH 0100 (2015; Suppl 2002-2016) Documentation of the Threshold Limit Values and Biological Exposure Indices

ASTM INTERNATIONAL (ASTM)

ASTM C144 (2011) Standard Specification for Aggregate for Masonry Mortar

ASTM C150 (2005) Standard Specification for Portland Cement

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ASTM C270 (2014-a) Standard Specification for Mortar for Unit Masonry

ASTM C1489 (2015) Standard Specification for Lime Putty for Structural Purposes

ASTM E2659 (2018) Standard Practice for Certificate Programs

NATIONAL PARK SERVICE (NPS)

NPS Historic Properties (1995) National Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring, and Reconstructing Historic Buildings

NPS TPS Brief 1 (2000) Assessing Cleaning and Water-Repellent Treatments for Historic Masonry Buildings

1.3 DEFINITIONS

Terms are defined below as applicable to this project.

1.3.1 Aggregates

The sand component of mortar .

1.3.2 Binder

The component of mortar that binds together the aggregate particles into a cohesive material .

1.3.3 Capital

The uppermost detail of the components of a column. In classical architecture capitals are one of the most distinctive components defining the different orders.

1.3.4 Dovetailed Lewis

A five-piece steel dovetailed assembly with a pin and shackle used for lifting heavy stone. A dovetailed recess is cut into the bedding top surface of the stone above its center of gravity. This dovetailed recess has already been carved into the existing Ord-Weitzel historic stone components from previous placements. Contractor shall clean out the existing dovetailed recesses and fabricate a new dovetailed lewis to securely fit into each historic stone component recess. Refer to Detail D3 Dovetail Lewis Stone Lifting Device Detail on drawing Sheet A-310A.

1.3.5 Dutchman

A repair method in which deteriorated stone is removed in part and replaced with salvaged, harvested, or new stone to make a seamless patch.

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1.3.6 Entasis

From the word "bowed," entasis describes the subtle curve of a column.

1.3.7 Insitu

A term referencing a procedure in which the masonry units and mortar remain in place and are repaired without removal from the wall system.

1.3.8 Limewash

A protective surface treatment comprised of calcium hydroxide particles in suspension in water, along with small amounts of calcium carbonate, and other minerals.

1.3.9 Mock-up

Specific area approved by Contracting Officer to demonstrate the contractor's ability to apply, match, and install specified materials.

1.3.10 Mortar

A mixture of binders, aggregates, and pigments used for construction.

1.3.11 Remediate

The practice of restoring a historic masonry structure and its component materials with the intent to maintain the original fabric to the greatest extent possible.

1.3.12 Replace

To reinstall an item in its original position (or where indicated) after remedial treatment, or to duplicate and reinstall an entire item with new material; with the original item serving as the pattern for creating the duplicate.

1.3.13 Test Panel

Specific area on the structure approved by the training instructor and the Contracting Officer to demonstrate individual applicator competency in workmanship proficiency after the on-site training.

1.3.14 Masonry Treatment Requirement (MTR)

Defined treatments that are required by the specification (contract) documents for a project specific to the masonry work .

1.3.15 Saturated Surface Dry (SSD)

Defined as a condition of the wall surface after water has been applied and allowed to dry to a point with no standing water visible.

1.4 PRE-CONSTRUCTION CONFERENCE

Two (2) weeks prior to beginning the work of this Section, convene a meeting with the Contracting Officer's Representative(s) to review the requirements of the Quality Control Plan, Project Training Program, installation procedures, location of required mock-up areas, and all job

SECTION 04 10 00 Page 3 Amendment #001 conditions and processes. All subcontracting firms involved with this work shall participate in this meeting.

1.5 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Quality Control Plan; G

SD-02 Shop Drawings

Detail Drawings; G

SD-03 Product Data

Cleaning Materials; G Limewash; G

SD-04 Samples

Mortar; G

SD-06 Qualifications

Masonry Inspector/Masonry Training Instructor/Consultant; G

SD-07 Certificates

Masonry Training Certificates; G

1.6 QUALITY CONTROL

Submit resumes for all workers demonstrating the minimum experience required. Product manufacturers, vendors, distributors, or suppliers of materials will not be permitted to offer on-site project training certificates or historic masonry consultation services.

1.6.1 Quality Control Plan

Prior to removing the stone from the storage area, submit a written Quality Control Plan. Include a separate section in the overall project Quality Control Plan specifically addressing the historic stone components erection. Do not proceed without written approval of the plan. At a minimum, include the items in the Quality Control Plan:

a. Identify and locate the storage are and the erection site for the project.

b. Describe the method for transporting the historic stone components from the storage area to the erection site.

c. Describe the method for removing the historic stone components from the storage area and placing it on the means of

SECTION 04 10 00 Page 4 Amendment #001 e4pmmrad Highlight e4pmmrad Highlight transportation.

d. Describe the method for removing the historic stone components at the staging area.

e. Describe the method for staging and protecting the historic stone components prior to erection.

f. Describe the method for lifting, positioning, and setting the historic stone components on the concrete piers. Include a detailed description of all tools, pins, lewises, nylon straps, hoists, pullies, I-beams, and other equipment.

g. Describe the sequence in which the historic stone components will be set.

h. Describe the means for ensuring accurate vertical alignment, as each historic stone component is set.

i. Describe the methods of protecting the stone piers and surrounding areas during construction.

j. Describe how the construction schedule may change as it relates to climate changes and protection of completed work.

k. Describe the methods for providing a safe working environment.

l. Describe the method and approach to cleaning mortar smears from the stone masonry surfaces after and during construction.

m. Describe, in detail, the procedures relating to mortar mixing techniques, procedures, and equipment used at the project site.

n. Describe the method of cleaning the historic stone components after erection.

o. Describe when limewash preparation, application, and curing will take place and which firm will provide the task.

1.6.2 Qualifications

1.6.2.1 Masonry Inspector/Masonry Training Instructor/Consultant

Secure the services of a historic masonry consultant with a minimum of ten

(10) years of experience applying NPS Historic Properties as they relate to the work in this section. Submit three relevant projects within that period that include how NPS Historic Properties were applied to the work of similar scope and scale and what jurisdiction or agency was involved in approving the work. The consultant's services include: observation and consultation during the removal of the historic stone components from the storage area; placement on the transport vehicle to the staging area;

staging and protection of the historic stone components; mortar mixing and the erection and cleaning process; removal at the staging area; providing quality control services during construction.

The consultant shall keep a complete record of all inspections and shall submit written reports to the Quality Control Supervisory Representative reporting on the quality of the construction. Submit copies of masonry inspection reports. Full time observation and consulting are required for

SECTION 04 10 00 Page 5 Amendment #001 e4pmmrad Highlight the historic stone components removal, transport, and placement at the staging area and throughout the erection process.

1.6.2.2 Masonry Training Certificates

Provide individual worker ASTM Masonry Training Certificates by each applicable MTR specified herein.

1.6.2.3 Erection Firm

The firm performing the erection shall have a minimum of ten (10) years of comparable experience on similar projects. The firm shall have completed work similar in material, design, and extent to that indicated for this Project and shall demonstrate a record of successful in-service performance. Proven implementation of NPS Historic Properties and related Preservation Briefs are required.

1.6.2.4 Limewash Application Firm

The firm shall have ten (10) years' experience in applying limewash to historic masonry structures, understand mixing, and formulation recipes, and application techniques.

1.6.2.5 Field Supervision

Retain an experienced full-time supervisor on the project site at all times when historic stone components construction is in progress. A single individual shall be responsible for supervising the historic stone components erection throughout the duration of the project.

1.6.2.6 Erection Personne l

Personnel shall be experienced in lifting, moving, and setting large, one-of-a-kind items such as works of art, monuments, and sculptures. The erection team should be comprised of personnel who have previous experience working together as coordination on this project will be critical.

1.6.2.7 Masonry Applicator

Employ craftspeople that are experienced with and specialize in stonewall system work of the types they will be performing. Mortar installation must be performed by a craftsperson that is familiar with historic masonry construction, has participated and passed the required onsite ASTM E2659 Masonry Training, and has worked on historic masonry projects for at least ten (10) years. Only skilled journeyman masons who are ASTM trained and are familiar and experienced with the materials and methods specified may be used.

1.6.3 Project Training Definition and Use

In addition to ten (10) years of demonstrable experience on masonry restoration projects, contractor must offer workers project-training certificate(s) within the framework of ASTM E2659. Project training certificates are earned by individual workers and issued with the understanding that they are for limited time use, enforceable only to this specific project and for a specific MTR. It is not necessary, nor a requirement of this specification, that all restoration workers obtain all project training certificates offered. Rather it is desirable that workers

SECTION 04 10 00 Page 6 Amendment #001 e4pmmrad Highlight e4pmmrad Highlight e4pmmrad Highlight e4pmmrad Highlight e4pmmrad Highlight e4pmmrad Highlight be trained for each project specific task they will perform in order to ensure the highest quality results from the work of this Section.

The following two (2) ASTM E2659 onsite MTR training certificates apply to this portion of the project:

a. Lime Mortar Mixing and Preparation/Installation (1-day)

b. Setting Column Drums Preparation/Installation (1-day)

1.6.4 Detail Drawings

Submit detail drawings including plans, elevations and details of existing historic stone components erection.

1.7 DELIVERY, STORAGE, AND HANDLING

Labeling of packages shall clearly define contents, manufacturer, and batch identification. Include the date of manufacture of materials, manufacturers' formulation number, manufacturers' directions including any warnings and special precautions, and name of manufacturer. Store materials in weather tight structures, which will exclude moisture and contaminants. Accessories shall be stored avoiding contamination and deterioration. Admixtures which have been in storage onsite for six months or longer, or which have been subjected to freezing, shall not be used unless retested and proven to meet the specified requirements.

1.8 FIELD CONDITIONS

1.8.1 General Ambient Conditions

Masonry or mortar shall not be placed when weather conditions detrimentally affect the quality of the finished product. No masonry or mortar shall be placed when the air temperature is below 40 degrees F in the shade. When air temperature is likely to exceed 95 degrees F masonry and mortar shall have a temperature not exceeding 95 degrees F when applied. Materials to be used in the work shall be neither produced nor applied during periods of rain or other precipitation. Stop material applications and protect all in-place material from exposure during periods of rain or other precipitation. Masonry surfaces shall be cleaned only when air temperatures are above 40 degrees F and will remain so until masonry has dried out, but for not less than seven (7) days after completion of the work.

1.8.2 Masonry Installation Conditions

Do not perform any historic stone components construction unless air temperatures are between 40 degrees F and 95 degrees F and will remain so for at least four (4) weeks thirty-one (31 days) after completion of work.

Phase historic stone components construction during hot weather by shading the work area or schedule installation of materials during cooler evening hours to prevent premature evaporation of the water from the mortar. Do not use frozen materials or materials mixed or coated with ice or frost.

Do not lower the freezing point of mortar by the use of admixtures or anti-freeze agents. Do not add chlorides to the mortar. Prevent construction mortar from staining the face of the masonry or other exposed surfaces. Immediately remove all mortar that comes in contact with such

SECTION 04 10 00 Page 7 Amendment #001 surfaces. Cover partially completed work when work is not in progress.

Protect the stylobates, column drums, and stone veneer piers from mortar droppings. If the Contractor fails to protect against damage as a result of work of this Section, such damage shall be the Contractor's responsibility. The Contractor shall restore damaged areas to the complete satisfaction of the Owner at no expense to the Owner. Do not apply products under conditions outside the Government and manufacturers' requirements, which include:

a. Stone and mortar surfaces that are frozen; allow complete thawing prior to installation.

b. Stone and mortar surfaces where air temperatures are below 40 degrees F.

c. Stone and mortar surfaces where air temperatures are above 95 degrees F.

d. When masonry surfaces or air temperature is not expected to remain above 40 degrees F for at least four (4) weeks thirty-one (31 days) after application.

e. Wind conditions that may blow materials onto surfaces not intended to be treated.

1.9 WARRANTIES

1.9.1 Cleaning Warranty

Warrant cleaning procedures for a period of two (2) years against harm to substrate (historic stone components, mortar and limewash) or to adjacent materials including, but not limited to, discoloration of substrate from improper procedures or usage, chemical damage from inadequate rinse procedures, and abrasive damage from improper procedures.

1.9.2 Construction Warranty

Warrant procedures to include construction work for a period of two years against: discoloration or mismatch of new mortar to adjacent wing wall mortar, discoloration or damage to masonry from improper mortar clean-up, loss of bond between historic stone components and mortar, fracturing of masonry edges from improper mortar joint preparation, or setting procedures or improper mortar formulation, and occurrence of efflorescence.

PART 2 PRODUCTS

2.1 CLEANING MATERIALSS

Selection of appropriate cleaning products requires a clear understanding of the masonry materials to be cleaned, a rationale for the cleaning, and an understanding of the anticipated level of cleanliness expected from the cleaning program. Take precautions against over-cleaning of surfaces, which may be detrimental to historic stone components and limewash. This is particularly relevant regarding the presence of limewash. If cleaning reveals unexpected conditions: suspend the cleaning action, protect the exposed area, and notify the Contracting Officer. Research has determined that overly aggressive cleaning methods and materials can cause subtle, long-term damage to historic stone. Use products that have a minimum

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5-year performance record on similar projects. Selection of the products shall be predicated on long-term negative effects to the masonry rather than current level of cleanliness of the comparable structure.

2.1.1 Cleaning Implements

Furnish brushes that contain soft natural or nylon fiber bristles only. Do not use wire brushes. Scrapers and application paddles shall be made of wood with rounded edges. Metallic tools are not permitted .

2.1.2 Water

Obtain potable water from a local source. Filter to remove minerals resulting in a neutral pH, prior to application.

2.2 MATERIALS

The materials for use in the historic stone components erection include the original historic stone components in the storage Area located at the intersection of Eisenhower and Patton Drive, mortar for placement between the historic stone components, and shims (if required) to ensure accurate vertical alignment. In addition, specialized tools and equipment are required to lift and set the historic stone components.

2.2.1 Mortar

The mortar shall be utilized to infill between each historic stone component to help ensure that the weight of each historic stone component is uniformly spread across the surface area of the historic stone components below. The mortar shall be lime-based and have greater vapor permeability and be softer (measured in compressive strength) than the historic stone component (it should be noted that the stone will primarily be supported by historic stone component). The mortar mix shall incorporate aggregates of suitable size and gradation to ensure that the maximum historic stone component on mortar bearing is achieved and the aggregates in the mortar do not interfere with achieving vertical alignment.

2.2.2 Mortar Mix Design

Mix by volume 1 part portland cement; 2 parts lime putty and 8 parts aggregate. This mortar mix design shall be continuous during the construction. This mix design meets the Proportion Specification ASTM C270 Standard Specification for Mortar for Unit Masonry, Type O.

2.2.2.1 Lime Putty

The use of non-hydraulic lime putty as the mortar binder must meet ASTM C1489 Standard Specification for Lime Putty for Structural Purposes.

High calcium or dolomitic lime putty is permitted. Approved lime putty manufacturers are listed below:

a. U.S. Heritage Group, Chicago, IL

b. Graymont Dolime, Genoa, OH

2.2.2.2 Portland Cement

The use of portland cement must meet ASTM C150 Standard Specification for

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Portland Cement .

2.2.2.3 Aggregates

Aggregates for the mortar used between the historic stone components shall be graded to fulfill the primary function of aiding in the support of the overlying historic stone components by providing bearing strength where the historic stone components do not meet directly. Adjust particle size of the aggregate as necessary to ensure the mortar binder is not required to fill large interstitial spaces. Aggregates to comply with ASTM C144 Standard Specification for Aggregate for Masonry Mortar.

2.2.3 Historic Stone Components

The Aquia Creek sandstone components and limestone urns and pedestals will be used in the erection of the historic stone components. They have been conserved and repaired and are stored at the cemetery. The individual pieces will be set in a sequential order. The historic stone components consists of eleven (11) individual pieces. The pieces have been identified by assembly location within each column as shown on the drawings. The historic stone components are not interchangeable. The historic stone components, when assembled, are larger in diameter at the bottom than they are at the top. A plum bob system will need to be created to ensure vertical alignment. The historic stone components are 5 inches out of plumb by design from bottom to top (entasis).

2.2.4 Shims

Shims may be required to ensure true vertical alignment during the process of the work. These may be comprised of material compatible with the historic stone components. Options include lead, wood, or stone of a similar strength and density to the Aquia Creek sandstone. Contractor is to avoid creating point loads during the erection of the column drums. The use of shims can be used to establish positioning with the bedding mortar.

Setting stone column drums on shims without mortar will not be permitted.

Follow methods and procedures established during the on-site training component.

2.3 EQUIPMENT

2.3.1 Transportation

Provide vehicle(s) suitable for transporting the historic stone components from the storage area to the erection staging area. Ensure the vehicle(s) are capable of supporting the weight of the historic stone component and transporting them in a manner that will prevent the historic stone components from being damaged. Secure the historic stone component on the vehicle using straps and pads. Particular attention shall be paid to securing and transporting the urns as the majority of the weight is at the top of these pieces and the neck at the base is narrow. In addition, extra care shall be taken to set and secure the column capitals.

2.3.2 Lifting Equipment

2.3.2.1 Transpor t

The equipment (fork lift - minimum 5,500 lbs. lifting capacity) shall be capable of lifting and placing the historic stone component on the transport vehicle and removing and placing historic stone component in the

SECTION 04 10 00 Page 10 Amendment #001 staging area. The historic stone components are currently placed on pallets, which shall be utilized during the lifting, transport, and placement in the staging area. The capitals and urns will require special care as the capitals are set on additional supports and the urns can overturn easily. Should any pallet be deemed "damaged" and not suitable for use, it shall be replaced. Ensure the historic stone components are secure on the pallets before lifting and placement on the transport vehicle. Any damage to the historic stone components is the sole responsibility of the contractor. This includes any conservation repairs or new damage due to the movement and transportation to the staging site.

The repair shall be at no cost the Government.

2.3.2.2 Erection Equipment

The Lull 644E42 telescopic forklift utilized for the erection shall be capable of lifting the historic stone component on the pallets to the proper height and position {forty-two (42) feet}. Pipe scaffolding with an I-beam, 3-ton dual ball bearing trolley and 3-ton chain hoist will be constructed in order to remove each historic stone component off the pallet. Each historic stone component shall be sequentially set on top of the pier to the full height of the columns. The pipe scaffolding shall be engineered and constructed to support the weight of each historic stone component. The I-beam, 3-ton dual ball bearing trolley and 3-ton chain hoist shall be engineered to allow for setting each stone using a dovetailed lewis, pin lewis, and nylon straps. The option of using a crane can be considered only if the contractor can describe in detail the means and methods of its use. If at anytime a Dutchman repair is damaged or becomes loose during lifting, the contractor is responsible for repairing such damage to the satisfaction of the Government.

2.3.2.2.1 Dovetailed Lewis

Dovetailed Lewis is typically used in the erection of the historic stone components and will serve as the final positioning devices for the column components, with the exception of the capitals, pedestals and urns.

Dovetailed lewis and pin lewis were used in the original erection and deconstruction of the gate columns in 1970s. Variations on the lewises will be considered as options.

2.3.2.2.2 Chain Winch

A chain winch capable of lifting 5,500 lbs. historic stone components shall be utilized in combination with pullies and I-beam connected to pipe scaffolding.

2.3.2.2.3 Nylon Straps

Nylon straps or slings shall be employed in conjunction with or independent of the pin lewis and dovetailed lewis. The straps shall be woven, be of sufficient strength to lift and support the historic stone components, and designed to avoid damage to the historic stone components during use.

2.3.3 Vertical Alignment Equipment

2.3.3.1 Plumb Bob

A traditional plumb bob or laser equivalent shall be utilized to ensure the vertical alignment of the historic stone components. As the column

SECTION 04 10 00 Page 11 Amendment #001 drums taper slightly, suitable hardware shall be utilized to position the measuring device appropriately.

2.3.3.2 Level

A bubble or laser level shall be used to ensure the tops of each historic stone components section are parallel to the base.

2.3.4 Cleaning Equipment

Cleaning equipment shall not cause staining, erosion, marring, or other damage or changes in the appearance of the surfaces to be cleaned.

Contractor shall utilize manual methods for cleaning surfaces.

2.3.4.1 Sandblasting

Sandblasting shall not be utilized.

2.3.4.2 Water Blasting

High pressure, water blasting equipment shall not be utilized.

2.3.5 Spray Equipment

Spray equipment for water shall disperse water through a fan-shaped spray tip at an angle of not less than 15 degrees. Spray equipment shall deliver water at a pressure not greater than 100 psi and at a volume between 2.5 and 3 gpm. Spray equipment for limewash shall be capable at flow rates indicated. Keep the spray-tip at a 10-inch minimum distance from the stone surface during operations.

PART 3 EXECUTION

3.1 PREPARE THE ERECTION STAGING AREA

a. Identify the staging area in coordination with cemetery staff.

b. Prepare the staging area for the historic stone components by ensuring the ground is flat and stable enough to support the weight for the historic stone components.

c. Ensure access is available to the staging area on the date scheduled.

3.2 REMOVE HISTORIC STONE COMPONENTS FROM STORAGE AREA

a. Stage the transportation vehicle(s) outside the storage area in a manner that does not interfere with ongoing cemetery activities (i.e. funerals and maintenance activities).

1. Coordinate with cemetery staff the timing and location of the vehicle(s) based on the date scheduled for the work.

b. Utilize the main storage area gate to access the Ord-Weitzel historic stone column components.

1. There are eleven (11) historic stone components associated with each column. All historic stone components have been limewashed for the exception of the pedestals and the urns. The

SECTION 04 10 00 Page 12 Amendment #001 two (2) column base blocks are being replaced and are not onsite.

Do not use pieces 34A and 34B as these pieces have been damaged and contain cracks. New replacement pieces have been fabricated and await delivery to the site.

2. Each historic stone component is set on a pallet with an identifying tag.

c. Lift and transport each historic stone component on its pallet to the transport vehicle.

1. Ensure that the route is smooth and stable and can support the forklift and the historic stone components .

d. Place each historic stone components on the transport vehicle and secure it with straps for transport.

1. Special attention shall be paid to lifting, securing, and transporting the urns and column capitals.

3.3 TRANSPORTING THE HISTORIC STONE COMPONENTS TO THE STAGING AREA

a. Coordinate with cemetery staff regarding the route to be taken from the storage area to the erection-staging site based on the scheduled date.

b. Ensure the route can be negotiated based on the dimensions of the transport vehicle without having to go over curbs or other obstacles.

c. Take all precautions to ensure the historic stone components will not be damaged during transport .

3.4 PLACING THE HISTORIC STONE COMPONENTS IN THE STAGING AREA

a. Lift the historic stone components on its pallet and place it in its designated location.

b. Arrange the historic stone components to facilitate the erection process.

c. Protect the historic stone components from damage prior to erection .

3.5 LIFTING THE HISTORIC STONE COMPONENTS FOR ERECTION

a. Use the Lull 644E42 telescopic forklift, or crane to facilitate lifting of the historic stone components on the pallets to the designated position within the column.

b. Ensure necessary clearance for operation of the forklift or crane and that no trees or other natural or manmade elements will be damaged during the lifting and placement of the historic stone components.

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3.6 PREPARE THE MORTAR FOR SETTING THE HISTORIC STONE COMPONENTS

3.6.1 Mixing, Lifting, and Placing

Provide mixing equipment, material supplies, lifting equipment, and placement to support uninterrupted erection operations. Mix each mortar batch for three full minutes after the last ingredient is added. If using a mechanical mortar mixer add 1/3 of the required aggregate first, then the full portion of the lime putty, the remainder of the aggregate, and finally the full portion of the portland cement. Add enough water so the mix design resembles the consistency of brown sugar during installation.

Each batch shall be used within a period of 2.5 hours after mixing is complete. Re-tempering of the mortar is permitted within the allotted timeframe specified herein. Equipment used for mixing, conveying, and placing of materials shall be clean, free of old materials and contaminants, and shall conform to the material manufacturer's recommendations.

3.6.2 Protection

Protect persons, motor vehicles, stylobates, base blocks, stone column drums, piers, surrounding site features or buildings, equipment, and landscape materials from construction operations. Erect temporary protection covers, which will remain in operation during the course of the work, over pedestrian walkways and at personnel and vehicular points of entrance and exit. These historic stone components are designed with entasis (a subtle curve of the column from the bottom to the top by approximately 5 inches) therefore the bottom column drums will need to be protected from mortar droppings as the work progresses. Use plastic wrap to protect the stone historic stone components the work above.

3.6.3 Worker Exposures

Exposure of workers to chemical substances shall not exceed the limits established by ACGIH 0100 , or those required by a more stringent applicable regulation.

3.7 SETTING THE HISTORIC STONE COMPONENTS

a. Ensure that the tops of the piers are level before setting the stylobate. Subsequently ensure that each historic stone component is level prior to placing the next column drum component. The vertical alignment (entasis plumb) as well as the levelness of each historic stone component is critical and shall be checked at all points of the compass.

b. Use the specified mortar for the erection of the historic stone components. Saturate the top of the pier and bottom surface of the base block prior to setting, cleaning any debris or organics from the surfaces as part of the wetting process. Allow time for excess water to run off and evaporate prior to laying the mortar bed and setting the stone. Lay a full mortar bed on top of each column stone. Repeat the process of wetting the top of the lower stone and bottom of the stone being set following the above protocol. Setting historic stone components on dry surfaces will not be permitted.

c. Transfer the historic stone components from the pallet and lift and position using the pipe scaffolding, I-beam, dual trolley, SECTION 04 10 00 Page 14 Amendment #001 chain hoist, pin lewis, dovetailed lewis, and nylon straps. Remove the nylon straps just prior to setting the historic stone components.

d. Tamp down the historic stone components using wood or rubber mallets to seat the historic stone components and ensure historic stone components on mortar bearing.

e. Utilize compressible shims (wood-if needed) to "true" the historic stone components and ensure vertical alignment. Remove shims after one (1) hour from the time of mortar placement and when mortar can carry the weight of the historic stone components.

3.8 SETTING THE HISTORIC STONE COMPONENTS CAPITALS PEDESTALS AND URNS

a. The capitals, pedestals, and urns shall be lifted and placed using only straps. Ensure that the positioning of the straps will not interfere with the setting of the historic stone components.

b. Tamp down the historic stone components using wood or rubber mallets to seat the historic stone components, spread the mortar bed, and ensure historic stone components on mortar bearing.

c. Utilize compressible shims to "true" the capitals, pedestals, and urns and ensure vertical alignment.

d. The capitals can be easily damaged and all care shall be taken when placing, securing, and removing the straps.

3.9 TOOLING AND CLEANING MORTAR JOINTS

Where mortar has been left proud of the joint during the historic stone components setting process, cut the joint flush with the face of the historic stone component using a trowel after thumbprint hard state has been achieved. Mortar joint width shall not exceed 3/8 inch.

3.10 CLEANING THE HISTORIC STONE COMPONENTS POST ERECTION

The historic stone components, mortar, and limewash shall not be damaged or marred in the process of cleaning. Cleaning shall conform to NPS TPS Brief 1 . Surfaces shall be evenly cleaned with no evidence of streaking or bleaching. Use the gentlest methods possible for cleaning masonry to achieve the desired results. Make test patches to determine a satisfactory cleaning result. Cleaning shall proceed in an orderly manner, working from top to bottom and shall not result in staining, erosion, marring, or other damage to the surfaces of the historic stone components.

3.10.1 Test Patches

Demonstrate the materials, equipment, and methods to be used in cleaning in a test section approximately 3 feet by 3 feet. The location of the test section and the completed test section is subject to approval. Adjust the cleaning process as required and the test section until an acceptable process is obtained. Allow tested areas to dry before a determination is made on the effectiveness of a particular treatment. The historic stone components have been limewashed. Do not overly scrub these surfaces as the limewash can be removed easily. Clean mortar droppings from the stylobates at the end of each day.

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3.10.1.1 Water Cleaning

a. Gently scrub surfaces to be cleaned using sponges in order to remove surface contaminants. Pre-wet surfaces and use hand-held natural bristle or nylon brushes. Do not use wire brushes.

b. Rinse scrubbed surfaces clean of all contaminants and cleaning solutions with water in a low-to-moderate pressure spray, working downwards from top to bottom. The rinsing cycle shall remove all traces of contaminants and cleaning solutions.

3.11 INSTALL FINAL LIMEWASH COATS

Upon full execution of the erected historic stone components, the limewash application firm shall apply six (6) coats of limewash to all new mortar bed joints then followed by an additional two (2) coats to historic stone components once it has cured. The limewash will be applied to the following historic stone components: two (2) stylobates; two (2) base drums; twelve (12) stone drums; and two (2) capitals. The 2 pedestals and 2 urns are NOT to be limewashed.

3.12 PROTECTION OF WORK

Protect work against damage from subsequent operations.

3.13 DEFECTIVE WORK

Defective work shall be repaired or replaced, as directed, using approved procedures.

3.14 FINAL INSPECTION

Following completion of the work, inspect the columns for vertical alignment, damage, staining, and other distresses. Repair any defects as directed.

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