APPENDIX C - Specification Section 040140.52 Stone Cleaning.pdf

Section 04 01 40.52

FOR OFFICIAL USE ONLY

STONE CLEANING 31 July 2018

AOC PN. SB08003

A A/E PN: 55-17102-00

IFC SUBMISSION

SENATE UNDERGROUND GARAGE

RENOVATIONS AND LANDSCAPE RESTORATION

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SECTION 040140.52 - STONE CLEANING

PART 1 GENERAL

1.1 SUMMARY

A. Section Includes:

1. Applying cleaning mock-ups of all specified cleaning systems.

2. Removal of organic growth from exterior masonry.

3. Cleaning of the exterior masonry and stone benches of orange-colored stains and efflorescence/calcite by micro-abrasive cleaning methods.

4. 100% cleaning of stone masonry. Providing access to all Work areas during cleaning project for inspection by Architect.

B. Related Sections:

1. Section 04 01 27 - Repointing with Cement-Lime Mortar.

2. Section 04 01 40.91 - Stone Restoration.

1.2 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.3 REFERENCES

A. Except as modified by Construction Documents, applicable portions of the latest editions of following reference documents shall govern the Work.

1. United States Order 37-1 Preservation Policy and Standards, Stephen T. Ayers, Architect of the Capitol, February 6, 2013.

2. Senate Underground Garage Exterior Stone Pointing and Caulking Survey, Mary Oehrlein and Associates, Inc., September 2000.

1.4 DEFINITIONS

A. Very Low-Pressure Water: Less than 100 psi; 4 to 6 gpm.

B. Low-Pressure Water: 100 to 400 psi; 4 to 6 gpm.

C. Medium-Pressure Water: 400 to 800 psi; 4 to 6 gpm.

D. High-Pressure Water: 800 to 1200 psi; 4 to 6 gpm.

1.5 ADMINISTRATIVE REQUIREMENTS

A. Coordinate Work to ensure that adjacent areas are not adversely affected. Coordinate:

1. With Architect.

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2. With other trades:

a. To ensure that work done by other trades is complete and ready for cleaning Work.

b. To avoid or minimize work in immediate vicinity of cleaning Work in progress.

c. To ensure that subsequent work will not adversely affect cleaned surfaces.

B. Notify Architect of conflicts between Specifications and cleaning material manufacturer’s recommendations.

C. Pre-construction Meeting:

1. Conduct meeting at Site.

2. Review requirements for cleaning Work, including:

a. Construction schedule.

b. Availability of materials, cleaning personnel, equipment, and facilities needed to make progress and avoid delays.

c. Site use, access, staging, and set-up location limitations.

d. Sequencing of Work.

e. Test application and selection procedures.

f. Forecast weather conditions.

g. Surface preparation and substrate condition and pretreatment.

h. Cleaning procedures.

i. Testing and inspection requirements.

j. Temporary protection.

k. Government regulations.

3. Design/Builder’s Site superintendent, Stone Repair Subcontractor’s foreman, Cleaning

Subcontractor’s foreman, and Architect shall attend.

D. Sequencing: Perform cleaning and repair Work in following sequence:

1. Remove plant growth (vines, etc.).

2. Prior to cleaning, inspect for open mortar or sealant joints and other potential sources of water infiltration, and perform repairs and repointing as necessary to prevent intrusion of water and other cleaning materials into wall.

3. Clean walls, and apply biocide as specified.

1.6 SUBMITTALS

A. Product Data: List of products proposed for use, with Manufacturer's product literature and application instructions.

1. Include Material Safety Data Sheets for information only; safety restrictions are sole responsibility of Design/Builder.

B. Samples for Verification: Before performing mockups, samples of cleaning chemicals and abrasive.

C. Certificates: Signed by supplier of micro-abrasive system, certifying that Subcontractor’s personnel who will be working on Project, have been trained by supplier and are proficient in use of micro-abrasive system.

D. Protection Plan: Written plan describing protection measures proposed for use on Project.

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E. Containment, Collection, and Disposal Plan: Written plan describing methods for containing, collecting, and disposing of runoff during cleaning operations.

F. Cleaning subcontractor Qualifications: Evidence that subcontractor’s existing company has minimum 5 years of continuous experience in use of specified cleaning system; list of at least

5 representative, successfully-completed projects of similar scope and size, including:

1. Project name.

2. Owner’s name.

3. Architect’s name, address, and telephone number.

4. Description of work.

5. Cleaning system, including materials and procedures, used.

6. Project supervisor.

7. Total cost of cleaning work and total cost of project.

8. Completion date.

1.7 QUALITY ASSURANCE

A. Cleaning Subcontractor Qualifications: Experienced firm that has successfully completed cleaning work similar in material, design, and extent to that indicated for Project. Must have successful use of specified cleaning system in local area for minimum of 5 years.

1. Employ trained foreman minimum 5 years of experience as foreman on similar projects, who is fluent in English, to be on Site at all times during Work. Do not change foremen during course of Project except for reasons beyond control of Subcontractor; inform Architect in advance of any changes.

2. Employ cleaners with training and at least 3 years of experience with specified cleaning system.

3. Cleaners performing work must be trained in the use of the micro-abrasive system by the supplier.

B. Cleaning-System Manufacturer Qualifications: Firm regularly engaged in supplying cleaning system that has been used for similar applications with successful results; with technical representatives who are available for consultation and Site inspection and assistance at no additional cost to Architect of the Capitol.

C. Mockups: Apply cleaning system at 5 mockup locations selected by Architect to demonstrate procedures and effectiveness.

1. Test adjacent materials and other materials that may be affected by cleaning system, to determine if materials need to be protected. Test areas shall be small and in unobtrusive locations.

2. Mockups to be 25 square feet unless noted otherwise.

3. Mock ups should address removal of biological growth, removal of orange-colored stains, removal of efflorescence/calcite, and general soil removal.

4. Include protection systems and devices proposed for use to counteract adverse affects of cleaning system, in mockup.

5. Prepare mockups under same weather conditions anticipated for Work.

6. Allow period of at least 14 days after mockup preparation for evaluation of effectiveness of cleaning system and for negative reactions.

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7. If Architect determines mockup does not comply with requirements, modify mockup or construct new mockup until mockup is approved. Modifications may include minor adjustments to application methods, dilutions, and dwell times of products within limits recommended by manufacturers.

8. Approved mockups will be standard for judging completed Work.

9. Approved mockups may become part of completed Work if undisturbed at time of Substantial

Completion.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, and handle materials according to manufacturer’s recommendations and in such manner as to prevent damage to materials and structure.

B. Deliver materials to Site in original containers with seals unbroken, labeled with manufacturer’s name, product brand name and type, date of manufacture, lot number, and directions for storing and mixing with other components. Materials shall be clearly labeled with safety warnings.

C. Keep materials dry and do not allow materials to be exposed to moisture during transportation, storage, handling, and installation. Reject and remove from Site new materials which exhibit evidence of moisture during application, or have been exposed to moisture.

D. Store materials in original, undamaged containers in secure location approved by Architect, within temperature range required by manufacturer. Assume full responsibility for protection and safekeeping of products stored on Site.

E. Limit stored materials on structures to safe loading capacity of structure at time materials are stored, and to avoid permanent deck deflection.

F. Conspicuously mark damaged or opened containers or containers with contaminated materials, and remove from Site as soon as possible.

G. Remove and replace materials that cannot be applied within stated shelf life.

1.9 PROJECT CONDITIONS

A. Verify existing dimensions and details prior to performing cleaning Work. Notify Architect of conditions found to be different than those indicated in Bridging Documents.

B. Comply with limitations and restrictions for Site use, accessibility, and work hours imposed by codes, ordinances, rules, regulations, orders, laws, and other legal requirements of public authorities having jurisdiction, and by the Architect of the Capitol.

1. Comply with local regulations, water department, and Federal regulations covering protection and waste water disposal.

C. Environmental Limitations:

1. Perform cleaning Work when air temperature is 50 degrees F or above and is predicted to remain so for at least 7 days after completion of cleaning.

2. Do not perform chemical cleaning when air temperature is greater than 90 degrees F.

3. Do not perform cleaning Work when winds are sufficiently strong to spread cleaning materials to unprotected areas.

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D. Handle and use materials in strict accordance with safety requirements required by material manufacturer, Material Safety Data Sheets, and local, state, and federal rules and regulations.

Maintain Material Safety Data Sheets with materials in storage area and available for ready reference on Site.

E. Maintain adequate ventilation during preparation and application of cleaning materials.

1.10 CHANGES IN WORK

A. During rehabilitation work, existing conditions may be encountered which are not known or are at variance with Bridging Documents. Such conditions may interfere with Work and may consist of damage or deterioration of substrate or surrounding materials that could jeopardize performance of Work.

1. Notify Architect of conditions that may interfere with proper execution of Work or jeopardize performance of Work prior to proceeding with Work.

PART 2 PRODUCTS

2.1 CLEANING MATERIALS

A. Water for Prewetting, Cleaning, and Rinsing:

1. Clean, potable water, with iron content of less than 2 parts per million by weight.

2. Provide chemical test results to confirm local water is suitable for use on cleaning Project.

3. Notify Architect of local water conditions that may make it unsuitable for cleaning, including presence of additives, water softeners, or other agents.

B. Biocide:

D/2 Biological Solution, a quaternary ammonium chloride solution, pH = 9.5 at undiluted concentration, by de Gruchy’s Limeworks, www.LimeWorks.us PO Box 151, Milford

Square, PA 18935 (p) 215-536-6706.

C. Micro-abrasive cleaning systems:

1. “Rotec Vortex Cleaning Process,” a proprietary cleaning system based on micro-abrasives and low-pressure water delivered through a variety of nozzles producing a rotating vortex process. Acceptable equipment and micro-abrasives available from

Quintek Corporation; 501 Washington Street, Suite 4, Conshohocken, Pennsylvania

19428, tel. 800-567-0053.

a. Micro-abrasive media: M1035 glass powder, 180 micron.

b. Nozzle: 15 mm nozzle.

D. Pressure: less than 30psi measured at cleaning system. Iron stain remover:

1. X-190 Limestone & Concrete Cleaner, American Building Restoration Products, Inc.

2. Oxalic acid; Mix 10 percent acid with water by volume.

E. PoulticePowder for Iron Stains: Mix oxalic acid with inert clay materials composed of

80 percent attapulgite and 20 percent kaolin by volume.

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PART 3 EXECUTION

3.1 EXAMINATION

A. Examine substrates and conditions with Cleaning Subcontractor and representatives of cleaning materials manufacturers and cleaning equipment suppliers, as applicable, for compliance with requirements and other conditions affecting performance of cleaning Work.

1. Ensure that work done by other trades is complete and ready for cleaning Work.

2. Verify that areas and conditions under which cleaning Work is to be performed permit proper and timely completion of Work.

3. Notify Architect in writing of conditions which may adversely affect cleaning Work and recommend corrections.

4. Do not proceed with cleaning Work until adverse conditions have been corrected and reviewed by Architect.

5. Commencing cleaning Work constitutes acceptance of Work surfaces and conditions.

3.2 PROTECTION

A. Cleaning materials may include caustic or acidic chemicals, and may be subject to dispersion by wind and other weather features.

B. Take precautions to ensure safety of people, including building users, passers-by, and workmen, and animals, and protection of property, including adjacent building elements, landscaping, and motor vehicles.

C. Prevent cleaning solutions from coming into contact with pedestrians, motor vehicles, landscaping, buildings, and other surfaces that could be harmed by such contact.

D. Protect following elements:

1. Surfaces being cleaned from cleaning materials not designated for use on those surfaces.

2. Decorative features, such as bronze plaques, entrances, planters, signs, and standards.

3. Paving and sidewalk from staining or damage from cleaning operations.

4. Adjacent building areas from mechanical damage due to scaffolding and other equipment.

5. Windows, doors, joints, and other openings from infiltration of water or cleaning materials.

E. Limit access to Work areas.

F. Erect temporary protective canopies, as necessary, over walkways and at points of pedestrian and vehicular access that must remain in service during Work.

G. Comply with cleaning-material manufacturer’s written instructions for protecting building and other surfaces against damage from exposure to its products.

H. Cover adjacent surfaces with materials that are proven to resist cleaners being used unless cleaners will not damage adjacent surfaces.

1. Use covering materials that contain only waterproof, UV-resistant adhesives.

2. When no longer needed, promptly remove masking to prevent adhesive staining.

I. Assume responsibility for injury to persons or damage to property due to Work, and remedy at no cost to The Architect of the Capitol.

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3.3 EQUIPMENT

A. Spray Equipment: With pressure gages at compressor and spray nozzle, and volume meter at spray nozzle; ability to adjust pressure and volume at nozzle.

1. For chemical cleaner, use low-pressure tank or pump recommended by chemical cleaner manufacturer, equipped with cone-shaped spray nozzle.

3.4 CLEANING, GENERAL

A. The purpose of the cleaning process is to remove atmospheric deposits, soil, staining, grease, oil, and other contaminants without damage to or disintegration of the masonry surface.

B. The result of the cleaning is not expected to return the facade to a 100 percent clean or new appearance. The level of cleaning shall be as approved in the trial samples as specified herein.

C. The cleaning system shall not damage, etch, burn, bleach, streak, or discolor the masonry surface.

D. Perform cleaning Work in compliance with applicable codes and regulations that govern Work, including city, state, water department, OSHA, and Federal regulations, and with requirements of material manufacturers.

E. Use only cleaning products and methods indicated for wall material and location, and approved by mockups.

1. Do not use wire brushes or metal scrapers.

F. Perform cleaning Work in systematic manner, proceeding from top of wall to bottom in access area and from 1 end of elevation to other.

G. Perform cleaning Work to achieve uniform coverage of surfaces, including corners, moldings, and interstices, and to produce uniform effect without streaking or damaging wall surface.

H. Keep wall wet below area being cleaned to prevent streaking from runoff.

I. Perform cleaning Work in strict accordance with approved mockup materials and procedures.

Propose modifications to materials or methods as necessary to maintain level of cleaning in mockups or better. Perform mockups of proposed modifications; do not proceed with modifications unless approved in writing by Architect.

J. Prewetting and Rinsing Procedures:

1. For prewetting and rinsing:

a. Prewet and rinse surfaces with warm water at minimum flow rate of 4 gallons per minute. Use hot water, if approved, to improve effectiveness of cleaning and rinsing. Do not use higher pressures or lower flow rates unless approved by mock-ups.

1) Prewet surfaces at maximum pressure of 100 pounds per square inch.

2) Rinse surfaces at maximum pressure of 100 pounds per square inch.

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b. Use stainless steel nozzle with 40-degree fan spray, held at least 12 inches from surface.

c. Apply water in horizontal back-and-forth sweeping motion, overlapping previous strokes to produce uniform coverage.

2. On hot days, in direct sunlight, or as necessary, prewet multiple times so cleaning solution is applied to wet surface.

3. Rinse off cleaner solution and soil residue, moving upward from bottom to top of surface at each access location.

a. Continue rinsing until pH of surface has returned to neutral, 6.5 to 7.5.

b. Periodically test pH of rinse water running off surface with pH paper.

c. Repeat application of neutralizing afterwash if specified and rinsing as necessary until neutral pH is measured.

d. Measure pH of surface 48 hours after cleaning has been completed, when wall is dry. If pH is not neutral, rinse surface until neutral pH is achieved.

K. Chemical Cleaner Application Methods: Apply chemical cleaner to surfaces in conformance with chemical cleaner manufacturer’s written instructions and approved mockups.

1. Use brush or spray application methods, at subcontractor’s option. Use brushes that are resistant to chemical cleaners being used.

2. Do not spray apply at pressures exceeding 50 pounds per square inch, or less as determined by mockups.

3. Adjust pressure and volume of spray to ensure that cleaning methods do not damage wall material.

4. Do not allow chemical cleaners to remain on surface for periods longer than those recommended by chemical-cleaner manufacturer or specified.

5. Control wind drift of chemical cleaners.

L. Collect and legally dispose of cleaning materials and debris.

1. Neutralize alkaline and acid wastes for disposal off of property.

2. Dispose of runoff from cleaning operations by legal means, in manner that prevents soil erosion, undermining of pavement and foundations, damage to landscaping, and water penetration into building interior.

3.5 BIOLOGICAL GROWTH REMOVAL

A. Removal of Plant Growth: Carefully and completely remove vines, moss, shrubs, and plant growth from wall surfaces.

1. Cut at roots and allow to dry for as long as possible before removal.

2. Remove loose soil and debris from open joints.

3. Carefully remove heavy accumulations of material from wall surface with wood scraper. Do not scratch or chip wall surface.

B. Application of D/2 Biological Solution:

1. Dry-brush with soft, nylon-bristle brush to remove dense biological growth.

2. Prewet surface thoroughly.

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3. Liberally apply biocide with soft, nylon-bristle brush, being careful to completely cover surface, including crevices.

4. Allow to dwell for 10 minutes. Keep surface moist by misting as necessary during dwell time.

5. Immediately prior to rinsing, gently scrub surface brush.

6. Rinse thoroughly to return pH to neutral.

7. Test pH of surface to confirm surface has returned to neutral.

3.6 REMOVAL OF ORANGE-COLORED STAINS, EFFLORESCENCE, CALCITE AND

GENERAL SOILING

A. Preliminary Cleaning: Before beginning general cleaning, remove extraneous substances that are resistant to cleaning methods being used, including sealant, asphalt, and tar.

B. Perform cleaning with Rotec Vortex system in accordance with system supplier’s recommendations and approved trial samples. Pressure shall be no greater than 30 psi as measured at the Quintek unit, or as determined during test samples and approved by the Quintek supplier and the Architect. Cleaning medium and nozzle used shall be as specified herein, or as determined during test samples and approved by the Quintek supplier and the Architect.

C. Rinse thoroughly with water at low pressure (no greater than 200 psi, measured at the tip) at a flow rate of four gallons per minute, at a maximum water temperature of 120 degrees

Fahrenheit. Use a stainless steel spray tip giving a 40 degree fan spray, held at least 12 inches from the wall surface.

3.7 REMOVAL OF IRON STAINS WITH POULTICES

A. Prewet surface thoroughly.

B. Prepare poultice.

C. Apply to stain and cover with plastic.

D. Allow to dwell 24 hours.

E. Allow to dry.

F. Remove residue with wood scraper, scrub surface with soft brush, and use vacuum as needed.

3.8 FIELD QUALITY CONTROL

A. Architect will monitor progress and quality of cleaning Work, possibly including:

1. Observe completed Work and compare to approved mockups.

2. Observe wall material with field microscope for damage.

3. Test pH of runoff and wall surfaces.

4. Test samples of cleaning products and mixed solutions for conformance with Specifications and approved mockups.

B. Contactor Responsibilities:

1. Test pH of runoff and wall surfaces to verify neutral pH.

2. Provide access to Work for Architect and other consultants hired by Architect.

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3. Notify Architect at least 48 hours in advance of when lift devices or scaffolding will be relocated. Do not relocate lift devices or scaffolding until Architect has observed completed

Work.

4. Upon request, provide samples of cleaning products and mixed solutions to Architect.

C. Failure to use cleaning products and mix solutions as specified and approved are grounds for immediate termination of Contract Agreement.

D. Remedy areas that do not satisfy requirements at no additional cost to The Architect of the

Capitol. Modify cleaning procedures as required and approved by Architect.

3.9 CLEAN UP OF SITE

E. At end of each workday:

1. Clean Site and Work areas and place rubbish, empty cans, rags, and other discarded materials in appropriate containers.

2. Thoroughly rinse sidewalks to remove chemicals, dirt, pollutants, and other materials washed off building.

F. After completing cleaning Work:

1. Carefully remove protection materials, including tape, adhesive marks, and residue.

2. Clean spillage and soiling from adjacent surfaces using cleaning agents and procedures recommended by manufacturer of affected surface. Exercise care to avoid scratching or damage to surfaces.

3. Repair surfaces stained, marred, or otherwise damaged during cleaning Work.

4. Return building surfaces, landscaping, and grounds to condition prior to cleaning Work, including painted and glass surfaces, to satisfaction of the Architect at no additional cost to

Architect of the Capitol.

5. Clean up debris and surplus materials and remove from Site.

G. Waste Management:

1. Collect surplus cleaning materials that cannot be reused and deliver to recycling or disposal facility.

2. Treat materials that cannot be reused as hazardous waste and dispose of in appropriate manner.

END OF SECTION 040152.52