3-BPAttach 472-2024-086025.pdf

01 35 10-1 Minisa Bridge Rehabilitation SPECIAL PROCEDURES FOR HISTORIC TREATMENT Wichita, Kansas Revised 02/27/2026

SECTION 01 35 10

SPECIAL PROCEDURES FOR HISTORIC TREATMENT

PART 1 - GENERAL

1.01 RELATED DOCUMENTS

A. Section and general provisions of the Contract, including General and Supplementary Conditions and other Division 1 Specification Sections, apply to this Section.

1.02 SUMMARY

A. Section includes general protection and treatment procedures for the entire Project and the following specific work:

1. Historic removal and dismantling.

B. Related Sections:

1. Division 4 Sections for specific requirements for cleaning and repairing of cast stone masonry.

C. For the purposes of this work, the following definitions shall apply. “Carthalite” refers to the integrally colored, decorative precast cast stone elements incorporated into the Minisa Bridge. These elements are multi-colored (including red, blue, black, green, yellow, and brown tones) and typically form architectural relief panels depicting bison, natural themes, and Native American figures and motifs. Carthalite elements are characterized by their ornamental function, sculptural detailing, and use of multiple integral pigmentations within a single unit. “Cast Stone” refers to the single-tone, buff-colored precast architectural cast stone elements. These elements are primarily linear or geometric in form and serve as architectural trim, coping, or edge treatments rather than sculptural relief features.

1.03 DEFINITIONS

A. Consolidate: To strengthen loose or deteriorated materials in place.

B. Dismantle: To disassemble and detach items by hand from existing construction to the limits indicated, using small hand tools and small one-hand power tools, so as to protect nearby historic surfaces; and legally dispose of dismantled items off-site, unless indicated to be salvaged or reinstalled.

C. Existing to Remain: Existing items that are not to be removed or dismantled.

D. Historic: Spaces, areas, rooms, surfaces, materials, finishes, and overall appearance which are important to the successful preservation rehabilitation as determined by the Architect. Designated historic spaces and surfaces are generally described below.

1. The cast stone elements on the Minisa Bridge, including the pillars, end walls, posts, panels, and copings are considered to be historic.

E. Match: To blend with adjacent construction and manifest no apparent difference in material type, species, cut, form, detail, color, grain, texture, or finish; as approved by the Architect/Engineer.

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Wichita, Kansas Revised 02/27/2026

F. Reconstruct: To remove existing item, replicate damaged or missing components, and reinstall in original position.

G. Refinish: To remove existing finishes to base material and apply new finish to match original, or as otherwise indicated.

H. Reinstall: To protect removed or dismantled item, repair and clean it as indicated for reuse, and reinstall it in original position, or where indicated.

I. Remove: Specifically for historic spaces, areas, rooms, and surfaces, the term means to detach an item from existing construction to the limits indicated, using hand tools and hand-operated power equipment, and legally dispose of it off-site, unless indicated to be salvaged or reinstalled.

J. Repair: To correct damage and defects, retaining existing materials, features, and finishes while employing as little new material as possible. Includes patching, piecing-in, splicing, consolidating, or otherwise reinforcing or upgrading materials.

K. Replace: To remove, duplicate, and reinstall entire item with new material. The original item is the pattern for creating duplicates unless otherwise indicated.

L. Replicate: To reproduce in exact detail, materials, and finish, unless otherwise indicated.

M. Reproduce: To fabricate a new item, accurate in detail to the original, and in either the same or a similar material as the original, unless otherwise indicated.

N. Restore: To consolidate, replicate, reproduce, repair, and refinish as required to achieve the indicated results.

O. Retain: To keep existing items that are not to be removed or dismantled.

P. Reversible: New construction work, treatments, or processes that can be removed or undone in the future without damaging historic materials, unless otherwise indicated.

Q. Salvage: To protect removed or dismantled items and deliver them to Owner.

R. Stabilize: To provide structural reinforcement of unsafe or deteriorated items while maintaining the essential form as it exists at present; also, to reestablish a weather-resistant enclosure.

S. Strip: To remove existing finish down to base material, unless otherwise indicated.

1.04 SALVAGE MATERIALS

A. Historic items, relics, and similar objects including, but not limited to, cast stone and their contents, commemorative plaques and tablets, and other items of interest or value to City of Wichita that may be encountered during removal and dismantling work remain City of Wichita’s property. Carefully dismantle and salvage each item or object.

B. Coordinate with City of Wichita and Architect/Engineer, who will establish special procedures for dismantling and salvage.

1.05 SUBMITTALS

A. Contractor Qualification Data: For cast stone masonry restoration contractor.

B. Conservator: Contractor is required to select a conservator prequalified in the work required for Carthalite and other architectural elements on the Minisa bridge. Contractor

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Wichita, Kansas Revised 02/27/2026 is required to select from the list below of pre-approved Conservators. Selected Conservator must be identified to the Owner at the preconstruction conference.

1. Ciociola Conservation

Kelly Ciociola kelly@ciociolaconservation.com

608-469-2141

2. Essex Works Ltd

Doug Schickler info@essexworks.com

718-218-8800

3. RLA Conservation

Christina Varvi cvarvi@rlaconservation.com

323-377-8425

C. Preconstruction Documentation: Show preexisting conditions of adjoining construction and site improvements, including finish surfaces, that might be misconstrued as damage caused by historic treatment operations.

D. Historic Treatment Program: Submit before work begins.

E. Inventory of Salvaged Items: After removal or dismantling work is complete, submit a list of items that have been salvaged.

1.06 QUALITY ASSURANCE

A. Historic Treatment Program: Prepare a written plan for historic treatment for the whole Project, including each phase or process and protection of surrounding materials during operations. Describe in detail materials, methods, and equipment to be used for each phase of work. Show compliance with indicated methods and procedures specified in this and other sections.

B. Dust and Noise Control: Include locations of proposed temporary dust- and noise-control partitions and means of egress from occupied areas coordinated with continuing on-site operations and other known work in progress.

C. Debris Hauling: Include plans clearly marked to show debris hauling routes, turning radii, and locations and details of temporary protective barriers.

1.07 STORAGE AND PROTECTION OF HISTORIC MATERIALS

A. Existing Historic Materials to Remain: Protect construction indicated to remain against damage and soiling from construction work. Where permitted by Architect, items may be dismantled and taken to a suitable, protected storage location during construction work and reinstalled in their original locations after historic treatment and construction work in the vicinity is complete.

B. Storage and Protection: When taken from their existing locations, catalog and store historic items within a weathertight enclosure where they are protected from wetting by rain, snow, condensation, or ground water, and from freezing temperatures.

mailto:kelly@ciociolaconservation.com mailto:info@essexworks.com mailto:cvarvi@rlaconservation.com

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1. Identify each item with a nonpermanent mark to document its original location.

Indicate original locations on plans elevations, sections, or photographs by annotating the identifying marks.

2. Secure stored materials to protect from theft.

1.08 PROJECT CONDITIONS

A. Notify Architect of discrepancies between existing conditions and Drawings before proceeding with removal and dismantling work.

B. Storage or sale of removed or dismantled items on-site is not permitted unless otherwise indicated.

PART 2 - PRODUCTS - (Not Used)

PART 3 - EXECUTION

3.01 PROTECTION, GENERAL

A. Ensure that supervisory personnel are on-site and on duty when historic treatment work begins and during its progress.

B. Protect persons, motor vehicles, surrounding surfaces of building, building site, plants, and surrounding buildings from harm resulting from historic treatment procedures.

1. Use only proven protection methods, appropriate to each area and surface being protected.

2. Provide barricades, barriers, and temporary directional signage to exclude public from areas where historic treatment work is being performed.

3. Erect temporary protective covers over walkways and at points of pedestrian and vehicular entrance and exit that must remain in service during course of historic treatment work.

4. Contain dust and debris generated by removal and dismantling work and prevent it from reaching the public or adjacent surfaces.

5. Provide shoring, bracing, and supports as necessary. Do not overload structural elements.

6. Protect adjacent surfaces from damage, wear, and staining.

C. Temporary Protection of Historic Materials:

1. Protect existing historic materials with temporary protections and construction.

Do not deface or remove existing materials.

2. Do not attach temporary protection to historic surfaces except as indicated as part of the historic treatment program and approved by Architect.

D. Comply with each product manufacturer's written instructions for protections and precautions. Protect against adverse effects of products and procedures on people and adjacent materials, components, and vegetation.

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3.02 PROTECTION DURING APPLICATION OF CHEMICALS

A. Protect motor vehicles, surrounding surfaces of bridges being restored, building site, plants, and surrounding buildings from harm or damage resulting from applications of chemicals.

B. Cover adjacent surfaces with protective materials that are proven to resist chemicals selected for Project unless chemicals being used will not damage adjacent surfaces as indicated in historic treatment program. Use covering materials and masking agents that are waterproof, UV- resistant, and will not stain or leave residue on surfaces to which they are applied. Apply protective materials according to manufacturer's written instructions.

Do not apply liquid masking agents or adhesives to painted or porous surfaces. When no longer needed, promptly remove protective materials staining.

C. Do not apply chemicals during winds of sufficient force to spread them to unprotected surfaces.

D. Neutralize and collect alkaline and acid wastes and legally dispose of off property.

E. Collect and dispose of runoff from chemical operations by legal means and in a manner that prevents soil contamination, soil erosion, undermining of paving and foundations, damage to landscaping, or water penetration into building interior.

3.03 GENERAL HISTORIC TREATMENT

A. Ensure that supervisory personnel are present when historic treatment work begins and during its progress.

B. Perform work as indicated on Drawings. Follow the procedures in subparagraphs below and procedures approved in historic treatment program.

1. Retain as much existing material as possible; repair and consolidate rather than replace.

2. Use reversible processes wherever possible.

3. Use historically accurate repair and replacement materials and techniques unless otherwise indicated.

4. Record existing work before each procedure (preconstruction) and progress during the work with digital preconstruction documentation photographs.

C. Notify Architect of visible changes in the integrity of material or components whether due to environmental causes including biological attack, UV degradation, freezing, or thawing;

or due to structural defects including cracks, movement, or distortion.

1. Do not proceed with the work in question until directed by Architect/Engineer.

D. Identify new and replacement materials and features with permanent marks hidden in the completed work to distinguish them from original materials. Record a legend of identification marks and the locations of the items on Record Drawings.

END OF SECTION

Minisa Bridge 04 01 20.52 Cleaning of Cast Stone

Cast Stone Repair February 26, 2026

SECTION 04 01 20.52

CLEANING OF CAST STONE

PART 1 GENERAL

1.1 SUMMARY

A. This Section includes cleaning of cast stone as follows:

1. Apply cleaning trial samples of all specified cleaning systems, as determined by previous testing, analysis, and trials.

2. Cleaning of the cast stone by chemical and water cleaning methods, as determined by cleaning trial samples. Note that one or more of the cleaning methods and materials specified may be used in overall cleaning, as determined by trial samples.

3. Removal of organic growth from exterior cast stone.

4. Providing access to all work areas during cleaning project for inspection by Architectural

Conservator/Engineer.

1.2 RELATED SECTIONS:

A. Section 01 35 10 - Special Provision for Historic Treatment

B. Section 04 01 20.53 - Cleaning of Carthalite

C. Section 04 02 10 – Cast Stone Patching

D. Section 04 72 00 – Cast Stone Masonry

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. Secretary of Interior’s Standards for the Treatment of Historic Properties.

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 SUBMITTALS

A. Product Data: Submit three (3) copies of each manufacturer’s product literature, application instructions, and Manufacturer’s Safety Data Sheets (MSDS) for all products used in cleaning before the work begins.

B. Samples for Verification: Before producing mock-up, submit samples of the following upon request of the Architectural Conservator/Engineer:

1. Samples of cleaning chemicals for testing and verification.

C. Qualification Data: For cleaning contractor or subcontractor and personnel.

1. Submit to the City of Wichita and the Architectural Conservator/Engineer with the Bid

Form a list of similar façade, monument, and historic structure cleaning projects performed in the previous five (5) years. For each project, include project address, description of cleaning scope of work, list of cleaning materials and systems used, and client contact information.

D. Protection Plan: Submit to City of Wichita three (3) copies of a written plan describing all protection measures and systems proposed by Contractor for use during the work.

E. Cleaning Program: Submit to City of Wichita three (3) copies of a written protection plan describing methods for and control of runoff during cleaning operations.

F. If materials and methods other than those indicated are proposed for cleaning work, provide a written description, including all product required for specified products, evidence of successful use on comparable projects, and a proposed testing program to demonstrate their effectiveness for this project. No cleaning materials and methods other than those specified may be used without prior written approval by the Architectural Conservator/Engineer and the City of Wichita.

1.6 QUALITY ASSURANCE

A. Cleaning Contractor Qualifications: Engage an experienced monument/architecture cleaning firm to perform work of this Section.

1. Firm shall have completed work similar to that indicated for this Project with a record of successful in-service performance.

2. Contractor performing this work shall have at least five (5) years’ experience in the cleaning of building facades, monuments, and historic structures.

B. Cleaning Worker Qualifications: Persons who are experienced and specialized in façade, monument, and historic structures cleaning work of types they will be performing.

1. Supervisory personnel shall have not less than five (5) years’ experience in supervising this type of work. All apprentices shall be under the direct supervision of an experienced supervisor.

2. Personnel performing cleaning shall have not less than three (3) years’ experience in façade cleaning.

3. Personnel performing the work shall be experienced in the use of chemical and water cleaning systems.

4. Keep at the project site during the period when work is being performed a competent superintendent/working foreman satisfactory to the City of Wichita.

5. The approved working foreman shall not be removed from the project without cause or without prior notification of the City of Wichita. If removal is for cause, Contractor shall submit justification in writing within 24 hours of the removal. All work will cease until a new working foreman is on site.

C. Cleaning System Manufacturer Qualifications: Cleaning system shall be provided by a firm regularly engaged in producing concrete and masonry cleaners that have been used for similar applications with successful results, and with technical representatives who are available for consultation and project site inspection and assistance throughout the duration of the project at no additional cost to the project.

D. Cleaning Program: Prepare a written, detailed description of materials, methods, equipment, and sequence of operations to be used for cleaning work including protection of surrounding materials and project site.

E. Trial samples and mock-up samples: Prepare trial samples and mock-ups of cleaning as follows to demonstrate effects and qualities of materials and execution. Prepare sample on existing surface under same weather conditions to be expected during remainder of the Work and project.

1. Prepare a trial of every protection system or device proposed for the protection of the

Carthalite and non-Carthalite elements as well as containment to mitigate runoff into the river. Protection trial may be installed as part of cleaning mock-up areas. The protection trial shall be tested to determine its vulnerability to weather and effectiveness. The City of Wichita may require that the Contractor conduct tests of the protection system before the cleaning work begins.

2. Execute trial samples if selected contractor is requesting to use alternate products than what are listed below in this specification. Trial samples do not need to be made if using the materials and techniques outlined below in this specification as they have been tested on the cast stone and have been proved not to adversely affect the substrate.

a. Area(s) where trial samples are to be applied shall be selected by the Architectural

Conservator/Engineer in consultation with the Contractor, and shall be approved by the City of Wichita.

b. Area of each trial sample shall be two (2) square feet for general surface cleaning and two (2) square feet for biological growth mitigation.

c. Additional trial samples shall be made until an acceptable result is achieved on the Carthalite substrate. Please note that minor adjustments to methods of application, dilutions, and dwell times of products shall be made in accordance with limits defined in the manufacturer’s recommendations.

3. Prior to proceeding with mock-up samples, test all chemical cleaners and cleaning methods for adverse reactions on adjacent materials that may be affected by the cleaning process, if those materials are to remain unprotected. Test areas of adjacent materials shall be small (less than two (2) square feet) and in unobtrusive locations. Protect against known deleterious effects of chemical cleaners and cleaning methods during testing.

4. Execute mock-up samples using the materials and techniques for each specified cleaning system based on trial samples.

a. Area(s) where mock-up samples are to be applied shall be selected by the Architectural Conservator/Engineer in consultation with the Contractor, and shall be approved by the City of Wichita.

b. Area of each mock-up sample shall be four (4) square feet for general surface cleaning and two (2) square feet for biological growth mitigation.

c. Additional mock-up samples shall be made until an acceptable result is achieved on each type of substrate. Please note that minor adjustments to methods of application, dilutions, and dwell times of products shall be made in accordance with limits defined in the manufacturer’s recommendations.

5. Do not proceed with work prior to approval of mock-up sample(s) by the Architectural Conservator/Engineer and City of Wichita.

6. Allow a waiting period of not less than fourteen (14) days after completion of sample cleaning to permit a study of sample area for effectiveness of cleaners and for negative reactions.

7. Protect mock-up samples during the work. Upon completion of the work and with prior approval by the Architectural Conservator/Engineer, mock-up samples may be incorporated into the overall work.

8. Approved mock-up cleaning samples shall be the standard of work for all cleaning of cast stone on the project.

9. Approved methods and materials for cleaning the neutral cast stone are not to be used on the decorative Carthalite surfaces. Separate specifications and standards for cleaning Carthalite are provided in section 04 01 20.53 Cleaning of Carthalite

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials to project site in manufacturer’s original and unopened containers, labeled with manufacturer’s name and type of products.

B. All cleaning materials stored and used on the site shall be clearly labeled with proper warning to prevent any accidental use of the products by unauthorized persons. Store cleaning materials and equipment at location approved by the City of Wichita.

C. Maintain MSDS for cleaning materials with materials in storage area and available for ready reference on project site.

1.8 PROJECT CONDITIONS

A. Confine operations at site to areas permitted by laws, permits, contract, and the City of Wichita.

B. Assume full responsibility for protection and safekeeping of products stored on premises, and for their proper use.

C. Clean cast stone surfaces only when air temperature and cast stone substrate surface temperature is 50 degrees Fahrenheit and above and is predicted to remain so for at least seven (7) days after completion of cleaning.

D. No chemical cleaning shall be performed when the air temperature and cast stone substrate surface temperature is less than 50 degrees Fahrenheit or greater than 90 degrees Fahrenheit and is predicted to remain so for at least seven (7) days after completion of cleaning.

E. Protect bridge, site features, river, and personnel against wind-driven spread of cleaning materials. No cleaning shall be performed when winds are sufficiently strong to spread cleaning materials to unprotected areas.

F. Clean cast stone surfaces only during hours approved by the City of Wichita and in accordance with local codes and ordinances.

G. Provide the City of Wichita and Architectural Conservator/Engineer with access to the bridge during the work at locations designated by the City of Wichita and Architectural Conservator/Engineer. Access shall be provided for periodic review of the work to assess quality, perform tests, and quantify areas that have been successfully cleaned.

H. Notify the Architectural Conservator/Engineer and City of Wichita immediately if conditions are uncovered which are not anticipated by the Construction Documents.

I. The City of Wichita retains the right to hire an industrial hygienist to monitor the runoff and cleaning procedure. The Contractor shall provide the City of Wichita’s Industrial Hygienist with access to the bridge during the work at locations designated by the City of Wichita and Architectural Conservator/Engineer. Access shall be provided for the periodic review of the cleaning procedures.

1.9 SEQUENCING AND SCHEDULING

A. Perform cleaning work in sequence relative to other cast stone and brick 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 two (2) parts per million, or 0.0002 percent (by weight).

2. Notify Architectural Conservator/Engineer and City of Wichita of any conditions of local water that may make it unsuitable for cast stone cleaning, including but not limited to the presence of additives, water softeners, or other agents.

3. Provide test results to confirm the local water is suitable for use in cleaning project.

B. Mild detergents, surfactants, and chelating agents:

1. EnvironKlean® 2010 All Surface Cleaner, an alkaline cleaning liquid pH = 10.5 at up to 1:10 dilution (volume/volume) based on test samples as manufactured by Prosoco, Inc., of Kansas City, Kansas.

C. Biocides:

1. D/2® Biological Solution – Biocide that is a quaternary ammonium chloride solution, pH =

9.5 at undiluted concentration, distributed by Cemetery Preservation Supply; tel: 214- 926-4175; www.gravestonecleaner.com.

2.2 AUXILIARY MATERIALS

A. Brushes: A Tampico bristle brush will likely be sufficient for most surface cleaning. A nylon bristle brush may be used at areas of heavier staining on the neutral cast stone if deemed safe during testing and mock-ups.

PART 3 EXECUTION

3.1 PROTECTION

A. Comply with all applicable safety codes and regulations that govern the work, including city, state, water department, OSHA and Federal regulations covering protection and wastewater disposal.

B. Take any precautions necessary to ensure the safety of pedestrians and those working on or adjacent to the bridge.

C. Erect temporary protective covers over pedestrian and bicycle pathways that must remain in service during the course of cleaning work.

D. Comply with chemical cleaner manufacturer’s written instructions for protecting the bridge and other surfaces against damage from exposure to its products.

1. Prevent chemical cleaning solutions from coming into contact with pedestrians, motor vehicles, landscaping, the river, and other surfaces that could be harmed by such contact.

2. Cover adjacent surfaces with materials that are proven to resist chemical cleaners used unless chemical cleaners being used will not damage surfaces. Keep surfaces wet below area being cleaned to prevent streaking from runoff.

3. Do not perform exterior cleaning during winds of sufficient force to spread cleaning solutions to unprotected surfaces.

4. Neutralize and collect alkaline and acid wastes for disposal off City of Wichita’s property.

5. Dispose of runoff from cleaning operations by legal means and in a manner that prevents soil erosion, undermining of paving and foundations, damage to landscaping, and water penetration into monument interiors.

E. Exercise caution in performing the work so as not to damage adjacent bridge elements. Protect the adjacent bridge/monument features from mechanical damage due to scaffolding and/or other equipment.

F. Protect all decorative features including, but not limited to, bronze plaques, railings, lighting elements, and other surfaces from the deleterious effects of the cleaning process.

G. Protect materials being cleaned from cleaners not designated for use on these substrates.

H. Protection from cleaning systems shall be approved by the Architectural Conservator/Engineer.

I. Repair any bridge materials that have been damaged by the cleaning work to the satisfaction of the Architectural Conservator/Engineer without additional cost to the City of Wichita.

J. Remove all protection materials carefully and thoroughly. Protection materials shall not damage or leave residue on surfaces. Materials to which protection was attached shall be left in the same condition as that previous to the cleaning operations.

K. Protect Carthalite, sidewalk, and paving from staining or damage by the cleaning operations.

Repair damaged Carthalite, sidewalk, and/or paving without any additional cost to the City of Wichita.

L. Exercise caution in performing the work so as not to damage bridge elements from mechanical damage due to the scaffolding, other equipment, and the cleaning operation. If any bridge elements are damaged by the execution of the Work, repair the damaged elements at no additional cost to the City of Wichita.

M. Protect Workers, Pedestrians, Animals, Plants, River, Automobiles, Other Property, Etc.

1. The work required herein includes the use of caustic chemicals that can harm workers and pedestrians, animals, plants, and damage automobiles, other structures, etc.

2. Protect workers, pedestrians, animals, plants, adjacent structures, parked or moving automobiles, and other persons and objects that are vulnerable to damage by the cleaning operations.

3. Any damage to adjacent structures, automobiles, etc., caused by the cleaning operation shall be the responsibility of the Contractor and shall result in no additional cost to the City of Wichita.

3.2 CLEANING CAST STONE, 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 cast stone surface.

B. The result of the cleaning is not expected to return the surfaces 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 any cast stone surface.

D. It is recognized that variations of the cleaning materials and their application may be required as the job proceeds. However, no variation will be acceptable without written approval of the Architectural Conservator/Engineer.

E. Notify the Architectural Conservator/Engineer if any conflict is encountered between the specifications and the manufacturer’s recommendations for the cleaning product or system.

F. Proceed with cleaning in an orderly manner, working from top to bottom of each section width on the bridge.

G. Use only those cleaning methods and materials indicated for each material and location.

1. Do not use wire brushes or scrapers. For chemical cleaning, use only natural fiber or (if approved during testing and mock-ups) nylon brushes that are resistant to chemical cleaners being used.

2. Use spray equipment that provides controlled application at volume and pressure indicated, measured at spray tip. All pressure applicators shall be equipped with pressure gauges at the compressor and at the spray nozzle. Adjust pressure and volume to ensure that cleaning methods do not damage the cast stone.

3. For chemical cleaner spray application, use low-pressure tank or chemical pump suitable for chemical cleaner indicated, equipped with cone-shaped spray tip, or other pump as recommended by manufacturer of cleaner. Control wind drift of chemical cleaners if spray application is used.

H. Perform each cleaning method indicated in a manner that results in uniform coverage of all surfaces, including corners, moldings, and interstices, and that produces an even effect without streaking or damaging cast stone surfaces.

I. Preliminary Cleaning: Before beginning general cleaning, remove extraneous substances that are resistant to cleaning methods being used, as determined by test samples. Extraneous substances include sealant, chewing gum, and macro biological growths.

1. Carefully remove heavy accumulations of material from surface of cast stone with a wood scraper. Do not scratch or chip cast stone surfaces.

J. Chemical Cleaner Application Methods: Apply chemical cleaners to cast stone surfaces to comply with chemical cleaner manufacturer’s written instructions; use brush application methods. Do not allow chemicals to remain on surface for periods longer than those indicated or recommended by the manufacturer.

K. Water Spray Applications: Unless otherwise indicated, hold spray nozzle at least twelve (12) inches from surface of the cast stone and apply water in horizontal back and forth sweeping motion, overlapping previous strokes to produce uniform coverage.

L. Prewetting and Rinsing Procedures:

1. Prewetting shall be performed at very low water pressures (measured at the tip), and rinsing shall be performed at low pressures (measured at the tip), at a flow rate of not less than four gallons per minute. Do not use higher prewetting or rinsing pressures, or lower flow rates, unless indicated by approved trial samples and mock-ups.

2. For prewetting, only apply cleaning chemicals to area that remains wet immediately at beginning of cleaner application. On hot days or in direct sunlight, it may be necessary to proceed with prewetting and cleaner application to small areas of surface, or to prewet the surface several times during the cleaner application.

3. For prewetting and rinsing, use a stainless steel spray tip giving a 40-degree fan spray, held at least twelve (12) inches from the wall surface.

4. Rinse off chemical and soil residue and soil by working upward from bottom to top of each treated area at each stage or scaffold setting.

5. Continue rinsing until pH of wall has returned to neutral (6.5 to 7.5).

a. Maintain pH paper on-site to check pH of rinsed surface.

b. Periodically during each rinse, test pH of rinse water running off of cleaned area to determine that chemical cleaner is completely removed.

c. Recheck pH of wall 48 hours after cleaning has been completed, when wall is dry.

M. After cleaning is complete, remove protection no longer required. Remove tape and adhesive marks.

N. Apply cleaning materials in strict compliance with the manufacturer’s written instructions and as specified.

3.3 CHEMICAL CLEANING AND BIOCIDE APPLICATION PROCEDURES

A. EnviroKlean® 2010 All Purpose Cleaner cleaning:

1. Prewet wall surface with very low pressure water.

2. Liberally apply diluted EnviroKlean® 2010 All Surface Cleaner to the surface using a soft

Tampico bristle brush, being careful to completely cover surface of area, including crevices. If approved during testing and mock-up, a soft-bristled nylon brush may be used for this task. Allow to dwell for fifteen (15) minutes. Dwell time to be confirmed by approved test samples.

3. On areas of cleaning exposed to wind or sunlight, monitor areas of work during dwell time to ensure that applied cleaners do not dry on the surface. Areas that begin to dry should be lightly misted with water.

4. Just prior to rinsing, agitate surface again by scrubbing gently and thoroughly with a nylon bristle brush.

5. Rinse thoroughly with low pressure warm water. Rinse the wall with clean water until the pH of the surface has returned to neutral.

6. Repeat cleaning sequence described above as necessary until cleaning standard established by approved samples is met.

7. The wall should be rinsed until the pH of the surface has returned to neutral. This may take a minimum of five (5) minutes. A second rinse within an hour of the first for at least two (2) additional minutes shall be performed to remove any cleaner residue. This second rinsing shall be performed with very low pressure water.

8. The pH of the wall surface shall be tested after final rinsing of cleaning solutions to confirm the pH of the surface has returned to neutral.

B. D/2™ Biological Solution:

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

2. Pre-wet thoroughly with water at very low pressure.

3. Liberally apply D/2™ Biological solution to the surface suing a hand-held, low-pressure

Hudson sprayer (or similar), being careful to completely cover surface of area including crevices. Allow product to dwell for ten (10) minutes. Dwell time to be confirmed by approved test samples.

4. On areas of cleaning exposed to wind or sunlight, the areas of work should be monitored during dwell time to ensure that applied product does not dry on the surface. Areas that begin to dry should be lightly misted with water.

5. Just prior to rinsing, agitate surfaces by scrubbing gently and thoroughly with a soft Tampico bristle brush. If approved after testing and mock-ups, a soft nylon bristle brush may be used for this task.

6. Rinse thoroughly with low pressure warm water.

7. Testing of the wall surface with pH paper shall be performed after final rinsing of cleaning solutions.

3.4 CLEAN-UP

A. The premises shall be kept in clean and orderly condition at all times during the progress of the work. Rubbish, barriers, dirt, debris, tools, equipment, and unused materials shall be removed from the site each day.

B. The sidewalk and pavers shall be thoroughly rinsed of all chemicals, dirt, pollutants, and other materials washed off the bridge each day.

C. Remove all empty drums, cleaning materials, and related supplies from the site.

D. After cleaning has been completed, remove any protection.

3.5 FIELD QUALITY CONTROL

A. Architectural Conservator/Engineer will observe progress and quality of portion of the Work completed. Allow Architectural Conservator/Engineer use of scaffolding, lifts, and/or platforms, as needed, to observe progress and quality of portion of the Work completed.

B. Notify Architectural Conservator/Engineer in advance of times when lift devices, scaffolding, and/or platforms will be relocated. Do not relocate lift devices, scaffolding, and/or platforms until Architectural Conservator/Engineer has had reasonable opportunity to make observations of work areas at lift device or scaffold location.

C. Work in place shall be subject to inspection including field microscopy and pH testing. Work found to be unacceptable shall be corrected without additional cost to the City of Wichita.

D. Cleaning Materials:

1. Permit the Architectural Conservator/Engineer to collect samples of cleaning materials, if determined to be necessary by the Architectural Conservator/Engineer. These samples may be laboratory tested to verify that the products used in the cleaning process are the same as the materials, concentrations, and solutions approved.

2. Provide the Architectural Conservator/Engineer with access to the mixed solutions of the cleaning products at the site when so requested by the Architectural Conservator/Engineer.

3. Failure to maintain the chemicals, solutions, concentrations, etc., approved shall be reason for the immediate termination of the Contract Agreement.

E. Cleaning Process:

1. Permit the Architectural Conservator/Engineer to conduct tests on the cleaned and rinsed cast stone surfaces, if deemed necessary by the Architectural Conservator/Engineer. Tests will be performed to determine if the Contractor is thoroughly rinsing the surface and removing all traces of any acidic and/or alkaline products. The pH value will be recorded before and after.

2. Re-rinse the affected area without any additional cost to the City of Wichita if the Architectural Conservator/Engineer determines that the cast stone surfaces are not being sufficiently rinsed.

3. Reclean the affected area without any additional cost to the City of Wichita if the Architectural Conservator/Engineer determines that the cleaning has not been satisfactorily implemented.

Minisa Bridge 04 01 20.53 Cleaning of Carthalite

SECTION 04 01 20.53

CLEANING OF CARTHALITE

PART 1 GENERAL

1.1 SUMMARY

A. This Section includes cleaning of Carthalite as follows:

1. Apply cleaning trial samples of all specified cleaning systems, as determined by previous testing, analysis, and trials.

2. Cleaning of the Carthalite by chemical and water cleaning methods, as determined by cleaning trial samples. Note that one or more of the cleaning methods and materials specified may be used in overall cleaning, as determined by trial samples.

3. Removal of organic growth from exterior Carthalite.

4. Providing access to all work areas during cleaning project for inspection by Architectural

Conservator/Engineer.

1.2 RELATED SECTIONS:

A. Section 01 35 10 Special Provision for Historic Treatment

B. Section 04 01 20.95 Cast Stone and Carthalite Crack and Void Injection

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. Secretary of Interior’s Standards for the Treatment of Historic Properties.

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 SUBMITTALS

A. Product Data: Submit three (3) copies of each manufacturer’s product literature, application instructions, and Manufacturer’s Safety Data Sheets (MSDS) for all products used in cleaning before the work begins.

B. Samples for Verification: Before producing mock-up, submit samples of the following upon request of the Architectural Conservator/Engineer:

1. Samples of cleaning chemicals for testing and verification.

C. Qualification Data: For cleaning contractor or subcontractor and personnel.

1. Submit to the City of Wichita and the Architectural Conservator/Engineer with the Bid

Form a list of similar façade, monument, and historic structure cleaning projects performed in the previous five (5) years. For each project, include project address, description of cleaning scope of work, list of cleaning materials and systems used, and client contact information.

D. Protection Plan: Submit to City of Wichita three (3) copies of a written plan describing all protection measures and systems proposed by Contractor for use during the work.

E. Cleaning Program: Submit to City of Wichita three (3) copies of a written protection plan describing methods for and control of runoff during cleaning operations.

F. If materials and methods other than those indicated are proposed for cleaning work, provide a written description, including all product required for specified products, evidence of successful use on comparable projects, and a proposed testing program to demonstrate their effectiveness for this project. No cleaning materials and methods other than those specified may be used without prior written approval by the Architectural Conservator/Engineer and the City of Wichita.

1.6 QUALITY ASSURANCE

A. Cleaning Contractor Qualifications: Engage a conservator experienced in monument/architecture cleaning to perform work of this Section.

1. Conservator shall have completed work similar to that indicated for this Project with a record of successful in-service performance. Past experience working with sensitive, delicate surfaces is preferred.

2. Conservator performing this work shall have at least five (5) years’ experience in the cleaning of building facades, monuments, and historic structures.

B. Cleaning Worker Qualifications: Technicians who are experienced and specialized in façade, monument, and historic structures cleaning work of types they will be performing.

1. Supervisory conservator shall have not less than five (5) years’ experience in supervising this type of work. All apprentices shall be under the direct supervision of an experienced supervisor.

2. Conservation technicians performing cleaning shall have not less than three (3) years’ experience in façade cleaning.

3. Conservation technicians performing the work shall be experienced in the use of chemical and water cleaning systems.

4. Keep at the project site during the period when work is being performed a competent conservator satisfactory to the City of Wichita.

5. The approved conservator shall not be removed from the project without cause or without prior notification of the City of Wichita. If removal is for cause, Contractor shall submit justification in writing within 24 hours of the removal. All work will cease until a new conservator is on site.

C. Cleaning System Manufacturer Qualifications: Cleaning system shall be provided by a firm regularly engaged in producing concrete and masonry cleaners that have been used for similar applications with successful results, and with technical representatives who are available for consultation and project site inspection and assistance throughout the duration of the project at no additional cost to the project.

D. Cleaning Program: Prepare a written, detailed description of materials, methods, equipment, and sequence of operations to be used for cleaning work including protection of surrounding materials and project site.

E. Trial samples and mock-up samples: Prepare trial samples and mock-ups of cleaning as follows to demonstrate effects and qualities of materials and execution. Prepare sample on existing surface under same weather conditions to be expected during remainder of the Work and project.

1. Prepare a trial of every protection system or device proposed for the protection of the

Carthalite and non-Carthalite elements as well as containment to mitigate runoff into the river. Protection trial may be installed as part of cleaning mock-up areas. The protection trial shall be tested to determine its vulnerability to weather and effectiveness. The City of Wichita may require that the Contractor conduct tests of the protection system before the cleaning work begins.

2. Execute trial samples if selected contractor is requesting to use alternate products than what are listed below in this specification. Trial samples do not need to be made if using the materials and techniques outlined below in this specification as they have been tested on the Carthalite and have been proved not to adversely affect the substrate.

a. Area(s) where trial samples are to be applied shall be selected by the Architectural

Conservator/Engineer in consultation with the Contractor, and shall be approved by the City of Wichita.

b. Area of each trial sample shall be two (2) square feet for general surface cleaning and two (2) square feet for biological growth mitigation.

c. Additional trial samples shall be made until an acceptable result is achieved on the Carthalite substrate. Please note that minor adjustments to methods of application, dilutions, and dwell times of products shall be made in accordance with limits defined in the manufacturer’s recommendations.

3. Prior to proceeding with mock-up samples, test all chemical cleaners and cleaning methods for adverse reactions on adjacent materials that may be affected by the cleaning process, if those materials are to remain unprotected. Test areas of adjacent materials shall be small (less than two (2) square feet) and in unobtrusive locations. Protect against known deleterious effects of chemical cleaners and cleaning methods during testing.

4. Execute mock-up samples using the materials and techniques for each specified cleaning system based on trial samples.

a. Area(s) where mock-up samples are to be applied shall be selected by the

Architectural Conservator/Engineer in consultation with the Contractor, and shall be approved by the City of Wichita.

b. Area of each mock-up sample shall be two (2) square feet for general surface cleaning and two (2) square feet for biological growth mitigation.

c. Additional mock-up samples shall be made until an acceptable result is achieved on the Carthalite. Please note that minor adjustments to methods of application, dilutions, and dwell times of products shall be made in accordance with limits defined in the manufacturer’s recommendations.

5. Do not proceed with work prior to approval of mock-up sample(s) by the Architectural Conservator/Engineer and City of Wichita.

6. Allow a waiting period of not less than fourteen (14) days after completion of sample cleaning to permit a study of sample area for effectiveness of cleaners and for negative reactions.

7. Protect mock-up samples during the work. Upon completion of the work and with prior approval by the Architectural Conservator/Engineer, mock-up samples may be incorporated into the overall work.

8. Approved mock-up cleaning samples shall be the standard of work for all cleaning of Carthalite on the project.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials to project site in manufacturer’s original and unopened containers, labeled with manufacturer’s name and type of products.

B. All cleaning materials stored and used on the site shall be clearly labeled with proper warning to prevent any accidental use of the products by unauthorized persons. Store cleaning materials and equipment at location approved by the City of Wichita.

C. Maintain MSDS for cleaning materials with materials in storage area and available for ready reference on project site.

1.8 PROJECT CONDITIONS

A. Confine operations at site to areas permitted by laws, permits, contract, and the City of Wichita.

B. Assume full responsibility for protection and safekeeping of products stored on premises, and for their proper use.

C. Clean Carthalite surfaces only when air temperature and Carthalite substrate surface temperature is 50 degrees Fahrenheit and above and is predicted to remain so for at least seven (7) days after completion of cleaning.

D. No chemical cleaning shall be performed when the air temperature and Carthalite substrate surface temperature is less than 50 degrees Fahrenheit or greater than 90 degrees Fahrenheit and is predicted to remain so for at least seven (7) days after completion of cleaning.

E. Protect bridge, site features, river, and personnel against wind-driven spread of cleaning materials. No cleaning shall be performed when winds are sufficiently strong to spread cleaning materials to unprotected areas.

F. Clean Carthalite surfaces only during hours approved by the City of Wichita and in accordance with local codes and ordinances.

G. Provide the City of Wichita and Architectural Conservator/Engineer with access to the bridge during the work at locations designated by the City of Wichita and Architectural Conservator/Engineer. Access shall be provided for periodic review of the work to assess quality, perform tests, and quantify areas that have been successfully cleaned.

H. Notify the Architectural Conservator/Engineer and City of Wichita immediately if conditions are uncovered…