Section_J_-_Att_No__001_SOW_Bathhouse_Fountain_Repair_2025.pdf

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SCOPE OF WORK

SAN FRANCISCO MARITIME NATIONAL HISTORICAL PARK

AQUATIC PARK BATHHOUSE

MASONRY RESTORATION AT FOUNTAIN

MARCH 24, 2025

I. BACKGROUND

San Francisco Maritime National Historical Park’s (SAFR) Aquatic Park Bathhouse is a contributing structure to the Aquatic Park National Historic Landmark District. The Bathhouse’s main entry is on Jefferson Street; it is a defining feature of the building and serves as the primary entrance for visitors. The entry is surrounded by a slate stone, terrazzo and mosaic fountain by the artist Sargent Johnson.

The western portion of the fountain was damaged in December 2024 by an out-of-control car that collided with the lower basin of the fountain. Several slate wall caps, slate vertical cladding panels and terrazzo basin sides were broken, dislodged and damaged beyond repair, thus requiring replacement.

II. OBJECTIVE

The objective for this project is to hire a contractor to repair and restore the fountain to its pre-damaged appearance and functionality using new materials that match existing and replicate the historic configuration of the previous components.

III. SCOPE

This project is a historic restoration that includes the removal and disposal of remaining damaged stone and terrazzo panels, cleaning and preparing sub-structure surfaces and installing new panels inclusive of attachment anchors, setting, grout, pointing and sealant. The work includes:

• Removal of approximately 15 square feet of existing damaged panels.

• Cleaning and preparing of approximately 30 square feet of sub-structure surfaces.

• Installation of approximately 30 square feet of new panels:

o Approximately 25 square feet of +/- 2” thick slate wall panels and caps.

o Approximately 5 square feet of +/- 1” thick precast terrazzo basin side panels.

• Pointing of approximately 50 linear feet of joints.

All work will be performed under a single contract and contract period.

Any work beyond the scope of work must be evaluated and approved by the Contracting Officer.

Any work conducted without the approval of the Contracting Officer is at the risk of the

Contractor.

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IV. REQUIREMENTS

A. GENERAL PROVISIONS

1. The requirements stated in this document are minimum requirements, and as such are not intended to limit the contractor from surpassing the stated requirements.

2. The Contractor shall be responsible for furnishing all services, labor, parts, equipment, personnel, tools, and materials (except as noted below) necessary to completely repair and restore the damaged area of the fountain, meeting all requirements specified herein.

3. Masonry Restoration Qualifications: Work shall be performed by a firm with not less than 10 years successful experience in comparable stone rehabilitation and restoration projects. Firm shall have expertise in all the work listed in the scope.

Firm shall employ personnel and supervisors skilled in the rehabilitation and restoration processes and operations indicated. Provide with bid the following:

a) List of 3 to 5 projects completed by contractor that illustrate the firm's expertise in all of the work of this project.

b) Describe the contractor's work on each project.

c) Include the name of client or their representative for each project and their telephone number.

4. Minimum OSHA 10 certification for at least one job site participant to be present onsite at all times contractor work is being conducted.

5. The Contractor shall immediately notify the Contracting Officer of any ambiguities, inconsistencies and errors discovered in this scope of work or between contracting documents and existing conditions.

6. Responsibility for Site Damage: The Contractor will be held responsible for any damage or marks to existing construction resulting from activities of the Contractor and Contractor’s employees. Provide appropriate protection to existing finished surfaces.

7. Building Utilities: There is no exterior electrical service available. Water, restrooms and a utility sink are available in the building for contractor use.

8. The contractor must follow The Secretary of the Interior's Standards for the Treatment of Historic Properties as well as all federal, state and local health and safety guidelines.

9. Terrazzo work shall be conducted per the Terrazzo Specifications and Design Guide of the National Terrazzo & Mosaic Association, Inc (NTMA).

B. DOCUMENTS

The following documents are provided for use in completing the work:

1. This Scope of Work Document

2. Bathhouse Fountains Existing Conditions Document

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3. Fountain Damage Repair Drawings

4. Guidance on Site Specific Safety Plans

C. SUBMITTALS

1. Schedule - Prior to start of work, provide projected completion timeline/schedule from date of award showing milestones for onsite work.

2. Safety:

a) Prior to start of work, Contractor to provide a Site Specific Safety Plan.

See document “Guidance on Site Specific Safety Plans”.

b) If any solvents or VOC products are to be used on site, workers are to submit proof of certifications for respirator fit testing and must comply with all SDS recommendations.

3. Products – submit Technical Data Sheets (TDS) and Safety Data Sheets (SDS).

Work may not commence until submittals are accepted. Submit the following;

a) Anchors and dowels for reinstallation of slate panels

b) Adhesive for slate panel installation

c) Sealer for Slate Panel Edges

d) Weeps for Mortar Joints

e) Traffic Sealant

4. Samples - Submit to the Contracting Officer Representative samples of the following:

a) 6 inch by 6 inch sample of new replacement slate.

b) 6 inch by 6 inch sample terrazzo basin side.

c) Cured hand sample of mortar for use in pointing slate and terrazzo panels.

All mortar sample submittals shall include a written description of the mortar mix listing each materials and its relative proportion in the sample.

5. Layout Drawings – Drawings indicating:

a) Sizes/dimensions of panels

b) Panel joint locations

c) Location and type of anchorage

D. PRODUCTS

1. Slate Panel Installation

a) Replacement Stone - shall match the existing stone in color, texture and size. The surface of all replacement stone shall match the honed surface texture of adjacent stone. Stone shall be new, as distributed by Vermont

Structural Slate Co., Fair Haven, VT (800-343-1900).

b) Anchors and dowels for reinstallation of slate panels - All anchors, dowels and reinforcements shall be stainless steel, AISC Type 304 or 316.

Anchors to be welded, either for fabrication or installation, shall be AISC

Type 304 or 316.

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c) Adhesive: Adhesive shall be a two component, flexible epoxy gel, with minimum 4% elongation, 300 psi direct tensile bond strength, 10,000 psi tensile strength. Product shall be applicable to metals, masonry, concrete and other substrates as required, and shall be appropriate for use at ambient temperatures from zero degrees to 100 degrees Fahrenheit (-18 to

38 deg. C).

(1) Products: Subject to compliance with requirements, provide one of the following:

(a) FLEXI-WELD 520T, as manufactured by Edison

Coatings, Inc., Plainfield, CT (800-697-8055).

(b) Sikadur 32 Hi-Mod, as manufactured by Sika Corporation, Lyndhurst, NJ, (800-933-7452).

(c) EpoGel, as manufactured by ChemRex Inc., Shakopee, MN, (800-243-6739).

d) Sealer for Slate Panel Edges: Sealer to be applied to edges of slate panels to prevent further deterioration along bedding planes to be acrylic emulsion.

(1) Sealer Properties:

(a) Nonionic

(b) 46.5% solids

(c) 9.6 pH

(d) 1500 cP

(e) +6 Glass Transmission Temperature

(f) 8.8 Density

(g) 1.06 Specific Gravity

e) Mortar:

(1) Mortar Materials:

(a) Portland Cement: ASTM C 150, Type I; low-alkali per

ASTM C 150, Table 2.

(b) Hydrated Lime: ASTM C 207, Type S.

(c) Masonry cements, gypsum Portland cements, or blended cements shall not be used.

(d) No admixtures shall be used without written approval by

Contracting Officer.

(2) Aggregates:

(a) Sand: ASTM C 144 to match color and texture of existing original mortar. Sand shall not contain more than 50 parts per million of chloride ions and shall be free of organic contaminants.

(3) Pigments: Pigments may be added to match color and texture of existing original mortar. Pigments shall be natural oxide pigments.

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(4) Mortar for Setting of Slate Panels:

(a) Type N mortar in accordance with ASTM C270, mixed with the following volumetric proportions:

Portland Cement 1 part

Hydrated Lime 1 part

Sand 6 part

(b) Use sand with size, color and texture necessary to match existing original mortar.

(5) Mortar for Pointing of Slate Panels:

(a) Type N mortar (prehydrated for repointing) in accordance with ASTM C270, mixed with the following volumetric proportions:

Portland Cement 1 part

Hydrated Lime 1 part

Sand 6 part

(6) Weeps for Mortar Joints

(a) Weeps for mortar joints shall be 3/8” diameter plastic tubes with mesh screens.

(b) Round plastic weeps manufactured from Medium Density

Polyethylene; tested in conformance with ASTM D2244, ASTM D638, and ASTM D746.

2. Terrazzo Installation

a) Terrazzo Replacement Materials - Precast terrazzo panels shall be shape, color range and size to match existing terrazzo panels.

b) Mortar Materials

(1) Portland Cement: ASTM C 150, Type I; low-alkali per ASTM C

150, Table 2.

(2) Masonry cements, gypsum Portland cements, or blended cements shall not be used.

c) Aggregates:

(1) Sand: ASTM C 144. Sand shall be cleaned, washed, free of organic contaminants and shall not contain more than 50 parts per million of chloride ions.

d) Admixtures: No admixtures shall be used without written approval by

Contracting Officer.

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3. Traffic Sealant - Silicone Sealant to be used at joint between slate masonry panels and terrazzo sidewalk: One-part, cold applied, self-leveling silicone.

a) Sealant Properties:

(1) Joint Movement Capability, ASTM C 719: 100/50, 10 cycles, no failure

(2) Elongation, ASTM D 412: 1400 percent, minimum

(3) Hardness, ASTM D 2240: 50 durometer Shore 00, minimum

(4) Volatile Organic Compound (VOC) Content: 30 g/L maximum

(5) Color: Gray

4. Concrete Crack Sealant

E. EXECUTION

1. General

a) Protect persons, plants, motor vehicles, windows, surrounding surfaces of building with stone surfaces being restored, mosaic fountain basins, building site, and surrounding buildings from injury and damage resulting from masonry restoration work.

b) No work shall be performed unless air and surface temperatures are between 50 degrees Fahrenheit (10 deg. C) and 90 degrees Fahrenheit (32 deg. C) and will remain so for at least 48 hours after completion of work.

c) Work shall be protected during hot weather from premature or rapid curing by the use of dampened fabric coverings.

d) Prevent masonry patching materials from staining the face of masonry or other surfaces to be left exposed. Immediately remove all patching materials that come in contact with such surfaces.

e) Cover partially completed work when work is not in progress.

f) Protect sills, ledges and projections from droppings.

g) Clean project site and work areas daily, including common areas. Enforce requirements strictly. Dispose of materials lawfully.

h) Perform final cleaning

(1) Clean Project site, yard, and grounds, in areas disturbed by construction activities, including landscape development areas, of rubbish, waste material, litter, and other foreign substances.

(2) Sweep paved areas broom clean. Remove petrochemical spills, stains, and other foreign deposits.

(3) Remove tools, construction equipment, machinery, and surplus material from Project site.

(4) Clean exposed exterior and interior hard-surfaced finishes to a dirt-free condition, free of stains, films, and similar foreign substances. Avoid disturbing natural weathering of exterior surfaces. Restore reflective surfaces to their original condition.

(5) Remove labels that are not permanent.

(6) Leave Project clean and ready for occupancy.

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2. Examination and Preparation

a) Existing Conditions - Before proceeding with each component of the

Work, examine substrates, areas, and conditions, with Installer or

Applicator present where indicated, for compliance with requirements for installation tolerances and other conditions affecting performance.

Record observations. Verify compatibility with and suitability of substrates, including compatibility with existing finishes or primers.

b) Field Measurements: Take field measurements as required to fit the Work properly. Recheck measurements before installing each product. Where portions of the Work are indicated to fit to other construction, verify dimensions of other construction by field measurements before fabrication. Coordinate fabrication schedule with construction progress to avoid delaying the Work.

c) Space Requirements: Verify space requirements and dimensions of items shown diagrammatically on Drawings.

d) Review of Contract Documents and Field Conditions: Immediately on discovery of the need for clarification of the Contract Documents caused by differing field conditions outside the control of Contractor, submit a request for information to Contracting Officer.

e) Verification: Before proceeding to lay out the Work, verify layout information shown on Drawings, in relation to the property survey and existing benchmarks. If discrepancies are discovered, notify Contracting

Officer promptly

3. Slate Panel Installation

a) General: Refer to drawings for locations of anchors for attaching panels.

b) All anchors shall be installed in strict accordance with manufacturer’s recommendations.

c) Modify existing sub-structure as required to accept anchors.

d) Modify slate stone panel provided by government to accept anchors.

e) All slate shall be set by experienced stone masons, accurately and in accordance with the Scope of Work documents. Unless otherwise noted, every stone shall be set in a full bed of mortar with all vertical joints flushed full. All anchors and dowels shall be firmly placed and all anchor holes and dowel holes and similar holes completely filled with epoxy.

f) Slate panels shall be set level, plumb, square and true within the allowable tolerance. Notching or grinding of the edges of slate panels may be necessary to allow clearance for anchors in order to achieve plumb and square installation and uniform joint thickness. Notching or grinding shall only be allowed on edges that will not be visible following final installation of slate panels.

g) The Contractor shall supply temporary supports and bracing as required to maintain position, stability and alignment as units are being permanently connected.

h) When setting with mortar, all stones not thoroughly wet shall be drenched with clear potable water just prior to setting.

i) During setting, install plastic weeps at mortar joint below lowest course of stone panels. Weeps shall have mesh screen and shall be sloped downward toward the exterior faces of the stone panels.

j) During setting, immediately wash off any mortar splashed or dropped on face of slate panel during setting with a sponge and clean potable water.

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k) Following setting of units, the face of all slate units shall be scrubbed with a fiber brush and potable water, and then thoroughly rinsed with clean water. All face joints shall be brushed out clean to a depth of ¾ inch, the joint dampened and carefully pointed.

4. Slate Panel Edge Sealing

a) Sealer application at edges of slate panels: seal edges of slate panels at mortar joints before commencing repointing.

(1) Apply sealers in accordance with manufacturer’s written instructions, environmental regulations and application procedures determined from test panels approved by Contracting

Officer.

(2) Protect adjacent stone surfaces from damage and contact with sealer during sealer installation.

(3) Apply to clean, dry and properly prepared surfaces.

(4) Consult manufacturer’s written instructions for information on application equipment to be used and precautions to be taken with specified products.

(5) Dilute only as specified with clean, potable water in accordance with the manufacturer’s instructions. Dilute sealer so that no sheen is visible on slate surface following drying of sealer.

(6) Do not apply to below-grade surfaces.

(7) Do not apply to compensate for structural or mechanical defects in substrate.

(8) Avoid over spray, wind drift and splash of sealer.

5. Slate Panel Mortar Mixing

a) Mortar mixed on site shall be measured and controlled throughout all work periods. Do not mix mortar without prior approval of mixing procedures submitted to Contracting Officer.

b) Mortar shall be mixed in an approved type of power batch mixer.

Mixing time shall be such as to produce a homogeneous plastic mortar, but shall not be less than five minutes, approximately two minutes of which shall be for mixing the dry material and not less than three minutes for continuing the mixing after water has been added.

c) A minimum amount of water shall be used to produce a workable consistency for the intended use of the mortar.

d) Mortar for grouting shall be of a consistency required to flow the material into cracks and voids.

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6. Slate Panel Pointing

a) General:

(1) Joint profile shall be flush with surface of masonry.

(2) Mortar shall match existing in color and sand size.

(3) Thickness of joints shall be uniform.

b) Wet slate panels 24 hours prior to pointing and again immediately before pointing. Masonry is to be damp so that it does not rapidly absorb moisture, but without freestanding water.

c) Apply pointing mortar tightly in layers of 1/8 inch to fill joint with a pointing trowel having a blade that is narrower than the width of the joints. Alternatively, closed-cell foam backer rod may be used to fill deep joints to a depth of no more than 1½ times the width of the joint from the surface of the stone. Construct uniform joints.

d) Tool joints after final layer is thumbprint hard to specified joint profile.

e) Keep joints damp for at least 48 hours, or until surface is cured.

f) Where one day’s work joins that of the previous day, dampen the previous work so that a good bond will be formed.

g) All repointed mortar joints shall be washed with plain clean water to remove mortar debris from masonry surfaces. Washing shall be done within 48 hours following completion of repointing.

h) During cleaning of pointed joints, examine all joints in the work to locate cracks, holes and other defects in same and carefully point up and fill with mortar such defects. Where necessary, in the opinion of the

Owner’s representative, cut out joints and reset with pointing mortar exercising extreme care to insure the same color with that of the original work.

7. Terrazzo Installation

a) Setting:

(1) Remove any soil, mortar and other debris or foreign material from areas to receive precast panels.

(2) Set precast base sections in setting mortar.

(3) Fill joints between terrazzo panels and clean off all excess mortar.

b) Protection: Protect completed work during curing of setting mortar and mortar joints.

F. CONTRACT LINE ITEMS

Separate pricing shall be provided for the following Contract Line Items:

1. Contract Line Item #1 – Masonry Restoration at Fountain

Repair and restore the fountain.

II. DELIVERY

A. CONTRACTOR IDENTIFICATION

When performing as contractor, the contractor shall identify themselves as contractors for the government both orally and in writing. Under no circumstances shall the contractor state or imply that it is acting on behalf of the government.

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B. DELIVERY AND PRODUCTS

Delivery of materials and equipment will be directly to the work site.

III. GOVERNMENT FURNISHED PROPERTY (GFP)

A. Access - The government will provide for access to the facility for both required site visits and execution of the work.

B. Slate Wall Cap – the government will provide one wall cap panel, see drawings.

IV. SECURITY

The contractor and its’ representatives must check-in with National Park Service staff before entering the building.

V. TRAVEL

There are no travel requirements or provisions.

VI. OTHER UNIQUE REQUIRMENTS AND CONSIDERATIONS

A. WORK HOURS

Work shall take place on weekdays (Monday – Friday) between 8:00 AM and 4:00 PM, excluding federal holidays and closures. Contractor shall at all times conduct his operations to ensure that inconvenience to SAFR employees who work within the area is kept to a minimum.

B. PUBLIC RIGHT OF WAY

The work occurs adjacent to a public sidewalk. Disruptions to the public right of way shall be kept to a minimum. Construction related sidewalk encroachment permits, if required, are the responsibility of the contractor.

VII. PLACE OF PERFORMANCE

The work will be performed at 900 Beach Street, San Francisco, CA, which is part of the San

Francisco Maritime National Historical Park (SAFR), National Park Service.

VIII. PERIOD OF PERFORMANCE

Work shall begin no later than 30 days after contract award notice to proceed, and work shall be completed within 90 days beginning work.

IX. ACCEPTANCE

A. The Contracting Officer’s Representative, and NPS conservators, will review the work while in process.

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B. Final acceptance will be considered complete when the Contracting Officer’s

Representative determines that the established criteria as identified in this Scope of Work have been met.

C. After all deficiencies, if any, have been corrected, a Letter of Acceptance will be issued.

END OF SCOPE OF WORK