02 85 00 - MOLD REMEDIATION Specs.pdf

Updated: 02 April 2019

SECTION 02 85 00 . PAGE 1 OF 17

DIVISION 02 – EXISTING CONDITIONS

SECTION – 02 85 00

MOLD REMEDIATION

PART 1 GENERAL

1.1 SD-01 PRECONSTRUCTION SUBMITTALS: Within 10 days from the award of the contract and prior to the start of the work, submit to the Contracting Officer the following items

a. Preliminary Visual Assessment Report: A written report to document the pre-remediation condition of the work areas and the results of the HVAC systems inspection.

a. Microbial Remediation Plan: Submit a job-specific, detailed abbreviated plan approved by the contractor's Certified Industrial Hygienist (CIH) to the COR for final approval prior to start of work. The plan shall address the following items at a minimum:

i. Description of materials to be remediated, providing location and quantities, and methods to be used for remediation.

ii. Products: Disinfectants, detergents, biocides, sanitizing solutions, and fungicidal agents, (EPA).

iii. Containment procedures to include description and locations of engineering controls and decontamination unit to include entry and exit procedures (provide sketch of floor plan showing location of containment barriers and decontamination units). Include locations of Air Filtration Units (AFU) and AFU discharges to the outside.

iv. Description of personal protective equipment to be used during the remediation.

v. Construction barricades and barriers in occupied areas.

vi. HVAC Shut down and start-up procedures.

vii. HVAC Evaluation and remediation procedures.

viii. Moisture and relative humidity control procedures and equipment.

ix. Packaging and disposal procedures.

SECTION 02 85 00 . PAGE 2 OF 17

x. Safety Precautions to include lockout / tag-out, fall protection, confined space entry procedures, and fire protection.

xi. Description of the method to be employed to control cross contamination of areas not in the work area. Include a risk assessment related to the suitability of people to occupy areas adjoining the remediation area while remediation activities are ongoing.

xii. CIH Quality Control procedures to include visual inspection.

xiii. Procedures to control, abate, and dispose of Asbestos Containing

Materials (ACM), Presumed Asbestos Containing Materials (PACM) and Lead Based Paint (LBP) coincident with microbial remediation. ACM, PACM, and LBP shall be identified before work begins; Identify the presence, location, and quantity of ACM,PACM, and LBP therein pursuant to paragraphs (g),(k)(1) of 29 CFR 1926.1101 and for lead 29

CFR 1926.62.

b. Respiratory Protection Program: Provide written copy of Contractor's Respiratory

Protection program.

c. Worker Records: Provide the following documents for all workers, including supervisory personnel. If new workers are added to the crew, provide the same documentation for them.

Employee Instruction and Release Form: Provide documentation showing that each employee has been instructed on the following items:

i. Use and fit of respirators for employees entering and working in the

Containment area.

ii. Protective clothing.

iii. Protective measures.

iv. Safety and Emergency Egress Procedures.

v. Site specific fall protection plan and training.

vi. Microbial remediation hazards and practices including engineering controls and isolation. Training should include "hands on" training for microbial remediation supervisors.

vii. Workers' release forms stating the potential hazards involved with the scope of the work.

SECTION 02 85 00 . PAGE 3 OF 17

Worker Training Certification: Submit copies of training certificates for each employee indicating that the employee has received training at the appropriate level for the work prescribed in the description of work.

d. Certified Industrial Hygienist (CIH) Qualifications: Submit the name, address, and telephone number of the Certified Industrial Hygienist (CIH). Provide copies of board certificates, resume to document field experience, and evidence that the CIH have successfully completed training in microbial investigation and remediation.

e. Microbial Remediation Supervisor Qualifications: Onsite supervisor shall have one of the following certifications: Certified Microbial Remediator (CMR), Certified Microbial Remediation Supervisor (CMRS), or Applied Microbial Remediation Specialist (AMRS). Submit copies of supervisory training certificates

1.2 SD-03 PRODUCT DATA: Within 14 days of completion of remediation work submit:

a. Daily Project Logs.

i. Date.

ii. Name of Microbial Remediation Supervisor.

iii. Name of CIF monitoring work area.

iv. Number of workers on site.

v. Equipment utilized.

vi. Brief description of daily work activities.

vii. Listing of any non-compliance noted, emergencies, stop work orders and descriptions of any other significant events.

b. CIH Daily Reports.

c. Photographic Logs.

d. Contractor's Industrial Hygienist Report certifying the microbial remediation is complete.

SECTION 02 85 00 . PAGE 4 OF 17

The contractor shall submit to an initial Microbial Assessment Survey with containment categories and remediation methods specified for each work area and material within the work area to the COR. The initial Microbial Assessment Survey specified below shall be completed by a certified by a qualified assessor authorized by the Contracting Officer to do such work.

f. After approval of the initial visual assessment report and having instructions from the COR to proceed, prepare a microbial remediation plan for approval by the Contractor's Certified Industrial Hygienist (CIH). Include an assessment of the risk for people occupying areas adjoining the remediation area while remediation work occupying areas adjoining the remediation area while remediation work CIH approval of the plan, submit the plan to the COR or approval.

g. The Contractor's CIH shall monitor the site on a daily basis while remediation work is in progress, identifying work and work practices that are not in compliance with the approved microbial remediation plan, and performing all inspections required by this specification. The COR may require the removal of any individual for non-compliance with quality requirements specified in the contract.

1.3 MICROBIAL ACCESSOR REQUIREMENTS: The microbial assessor shall provide documentation proving that the assessor meets at least one of the following criteria:

a. Certification as an industrial hygienist (CIH) as certified by the American Board of Industrial Hygienists, safety professional (CSP) as certified by the Board of Certified Safety Professionals or engineer (PE). Additionally, one year experience in conducting microbial investigations is required.

1.4 QUALITY ASSURANCE / QUALITY CONTROL REQUIREMENTS

a. Superintendent Qualifications: Work shall be performed by a qualified remediation contractor. Superintendent shall carry insurance that specifically covers mold remediation.

i. Remediation contractors’ on-site supervisor shall have one of the following certifications: Certified Microbial Remediator (CMR), Certified Microbial Remediation Supervisor (CMRS), or Applied Microbial Remediation Specialist (AMRS). Qualified supervisor shall be onsite whenever active remediation is being performed. Set-up activities may be performed without supervisor present; qualified supervisor shall review set-up prior to start of work.

ii. Mold remediation workers shall be given training in PPE and mold remediation activities as required for their particular job. Microbial remediation plan shall provide details of worker training.

SECTION 02 85 00 . PAGE 5 OF 17

1.5 GENERAL: Use proper cleaning procedures, engineering controls, and apply best management practices to remove microbial growth and spore fallout from all surfaces and building materials to minimize the further release of microbial spores. Address semi-porous and nonporous surfaces within the facility in each cleaning phase of the project.

Damp wipe and HEPA vacuum all surfaces, at a minimum. Remove and dispose of porous building materials that are supporting microbial growth.

PART 2 PRODUCTS

2.1 DISINFECTANTS, SANITIZING SOLUTIONS AND FUNGICIDAL AGENTS (EPA):

Disinfectants, sanitizing solutions and fungicidal agents shall be EPA registered for the use detailed in the microbial remediation plan and used in accordance with the manufacturer's specifications. Provide SDS sheets to the COR for any chemicals that shall be used during the performance of the work for approval.

a. Basis of Design: Concrobium OAE

2.2 HAZARD COMMUNICATION: Adhere to all parts of 29 CFR 1926.59 and provide the Contracting Officer with a copy of the Safety Data Sheets (SDS) for all materials brought to the site.

PART 3 EXECUTION

3.1 EQUIPMENT: Provide manufacturer's certificate of compliance for all equipment used to contain the microbial contamination.

a. Respirators: Select respirators from those approved by the National Institute for Occupational Safety and Health (NIOSH), Department of Health and Human Services. Provide personnel engaged in set-up, pre-cleaning, cleanup, handling, and removal of contaminated materials with the appropriate respiratory protection as specified in 29 CFR 1910.134. Microbial remediation plan shall consider Table 17.1 in AIHA IMOM08-679 "Recognition, Evaluation, and Control of Indoor Mold", which lists the minimum levels of respiratory protection based on the activity and size of the remediated area.

b. Protective Clothing: Provide all workers with protective clothing as appropriate for the work being accomplished, as required by the Microbial Remediation Plan.

c. Warning Signs and Labels: Provide warning signs printed in English at all approaches to the work areas IICRC S500. Locate signs at such a distance that personnel may read the sign and take the necessary protective steps required before entering the area. Warning signs may be in the form of continuous plastic tape. The warning signs shall have black characters on a yellow background.

i. WARNING

SECTION 02 85 00 . PAGE 6 OF 17

DO NOT ENTER

MICROBIAL REMEDIATION WORK IN PROGRESS

d. Dehumidifiers: Install and use dehumidifiers as needed during the remediation to maintain relative humidity below 60 percent in the work area. Drain the condensate water to a permanent drain, or empty as needed to prevent water overflowing from the dehumidifiers. IHFOM, CH 13, Sec. 3

e. Air Filtration Units (AFU): Install and use AFUs with HEPA filters, and manufacturer specified pre-filters, as part of the exhaust ventilation system to develop and maintain the specified desired air pressure differential inside the enclosed work area relative to the outside areas. Acquire and pay for any licenses needed for use of any equipment, including but not limited to, air pressure differential systems and air filtration systems.

i. Replace HEPA filters and pre-filters for AFUs as required to maintain pressurization performance requirements during demolition and cleaning.

Do not reuse filters. Bag used filters at a minimum in clear 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) polyethylene bags within the containment and disposed as contaminated waste.

ii. Discharge air from any AFUs located in the work area containment to the outside environment when creating a negative pressure containment to create a negative pressure relative to the outside and adjacent work areas not undergoing active remediation of 5 pascals 0.02 inch H2O to 10 pascals 0.04 inch H20 AIHA IMOM08-679. Discharge air in excess of that required for creating the proper negative pressure to the work area.

The AFUs shall provide four to six air changes per hour in the work area (ANSI/IICRC S520). Under no circumstances may air from AFUs discharge to an occupied area. Coordinate location of window sashes or doors required for discharge openings with the COR. Exhaust discharge openings may be constructed of plywood, and the seals around such opening shall be airtight.

iii. Seal all exhaust and intake openings in AFUs with one layer of 0.15 millimeters 6 mil (IHFOM, CH 13, Sec. 3) polyethylene sheeting when not in use.

f. Vacuum Cleaners Equipped with HEPA Filters: Provide vacuum cleaners equipped with HEPA filters designed for continuous operation in order to complete the work in a timely and efficient manner.

i. Provide nozzle attachments as required to adequately remove all dust. As a minimum, nozzle attachments shall include crevice and extended bristle brush nozzles. Any vacuum that is not equipped with a HEPA filter shall not be used at any time.

SECTION 02 85 00 . PAGE 7 OF 17

ii. Provide sufficient vacuum cleaners equipped with HEPA filters designed for continuous operation in the work area during microbial remediation inside the containment area.

iii. Provide additional vacuum cleaners equipped with HEPA filters in the enclosed work area during remediation or cleaning work as required by the size (area) of the containment and to maintain timely progress of the work.

3.2 GENERAL REQUIREMENTS:

a. Pre-Microbial Remediation Work Conference: Meet with the COR prior to beginning work to discuss in detail the Microbial Remediation Plan, including work procedures and safety precautions. Once approved by the Contracting Officer, the plan shall be enforced as if a part of this specification. Any variances to the specification as a result of the plan shall be specifically identified to allow for free discussion and approved by the COR in writing prior to starting work.

Before work in areas with Asbestos Containing Materials (ACM), Presumed Asbestos Containing Materials (PACM) and Lead begins, identify the presence, location, and quantity of ACM, PACM and Lead. Ensure proper notification of regulatory authorities. Consult with Contracting Officer to obtain facility ACM / LBP surveys. Mitigate any disturbance of painted/coated surfaces in accordance with 29 CFR 1926.62, 29 CFR 1926.1126 and 29 CFR 1926.1127.

b. Containment Entry / Exit Procedure: Ensure that each worker and authorized visitor follows entry and exit procedures detailed in the Microbial Remediation Plan.

3.3 REMOVAL PROCEDURES

a. Protection of Existing Work Areas: Perform work in a manner to minimize the damage or contamination to areas outside or directly adjacent to the work area.

Inspect areas inside and outside proposed work areas to identify existing damage and notify Contracting Officer prior to start of work.

Where materials outside work area are damaged or contaminated as a result of the Contractors work efforts as verified by the COR using visual inspection or sample analysis, it shall be restored to its original condition or decontaminated by the Contractor at no expense to the Government as deemed appropriate by the COR.

Should adjacent or outside areas become contaminated as a result of the Contractors work efforts, stop work immediately. Clean the newly contaminated areas at no additional expense to the Government. The work may proceed at the discretion of the Contracting Officer once the area has been verified by visual inspection as restored.

SECTION 02 85 00 . PAGE 8 OF 17

b. Remediation of Fungally Contaminated Building Materials: The removal of contaminated materials shall follow in general the listed sequence of work. The Contractor may make changes to improve work flow with the approval of the

COR.

i. Provide level of containment and PPE required by the Microbial Remediation Plan.

ii. Disable all HVAC units and exhaust fans in the area to be remediated.

Cover and seal all supply vents, return vents, and air handling units in the project area using two layers of 0.15 millimeter 6 mil poly (IHFOM, CH 13, Sec. 3).

iii. Protect materials to remain in work area. Where possible, clean all materials to be salvaged in place to prevent possible cross-contamination created by moving materials through non-remediation areas.

iv. Remove undamaged items and materials to be cleaned and salvaged from the work area. Store materials in an area with relative humidity maintained below 60 percent and where temperatures shall not damage the material. Notify Contracting Officer of existing damage to items prior to removal.

v. Set up containments, including protection of materials remaining within the containment and AFUs. Notify Contracting Officer that the area is prepared for remediation activities.

vi. Pre-demolition inspection by the Contracting Officer.

vii. Demolition and removal / cleaning of contaminated materials.

viii. Post-remediation inspection by the Contracting Officer.

ix. Perform final cleaning in the containment.

x. Clean carpet in the containment if salvageable.

xi. Clearance inspection by the COR.

xii. Duct and HVAC cleaning, if necessary.

xiii. Deconstruction of containment, removal of AFUs.

xiv. Return previously items that were removed and cleaned to the occupied area.

SECTION 02 85 00 . PAGE 9 OF 17

c. Remediation Procedures:

i. Remediation of Non-Porous Materials:

1) HEPA vacuum all surfaces.

2) Damp wipe all surfaces using clean water or a detergent solution.

3) Ensure all cleaned surfaces are dried thoroughly.

ii. Semi-Porous Materials (Unfinished Wood): Use this method for remediating unfinished wood-based items, including wood and wood framing in wall cavities:

1) Cleaning

1. HEPA vacuum all surfaces.

2. Scrub surfaces with a brush and detergent to remove mold.

3. Ensure all cleaned surfaces are dried thoroughly.

4. HEPA vacuum all surfaces to remove dust.

5. Repair finishes as required to match original.

2) Removal: Where unfinished wood product has been structurally damaged, remove and replace with an equivalent product. This includes wall studs and sheathing, such as OSB used in flooring, wall, or roof construction. Lightly mist mold contaminated material before removal.

iii. Semi-Porous Materials: Use this method for surface cleaning semi-porous materials such as concrete, vinyl wall covering, linoleum, leather furniture, and finished wood products:

2) Damp wipe surfaces using clean water or a detergent solution.

Avoid over-wetting the material. Ensure all materials are dried thoroughly

iv. Porous Materials

1) Carpet

SECTION 02 85 00 . PAGE 10 OF 17

1. Cleaning: For carpet that has been wet for less than 48-hours) AIHA IMOM08-679: Use a dry absorbent compound cleaning method as designated by IICRC S100.

This method uses an absorbent compound to dissolve, suspend and absorb carpet soils. It does not add moisture back into the carpet. Ensure carpet is dried thoroughly after cleaning

2. Removal: Remove carpet that has remained wet for 48-hours or longer (AIHA IMOM08-679). If carpet has dried out, lightly mist before removal.

2) Gypsum Wallboard (GWB)

1. Surface Cleaning: here GWB has a small amount of surface mold growth and the GWB is structurally sound, a surface cleaning method may be used with the permission of the COR HEPA vacuum all surfaces and wipe down with a detergent solution. Do not use surface cleaning where mold growth penetrates wallboard substrate. Thoroughly dry the cleaned areas and paint to lock down any residual spores.

2. Removal: Remove Gypsum Wallboard that has remained wet for 48-hours or longer (AIHA IMOM08-679), or has visible mold growth. Where removal of GWB exposes insulation, remove the insulation. Lightly mist all contaminated materials before removal.

3) Ceiling Tile: Remove ceiling tile that has remained wet for 48-hours or longer, or has visible mold growth (AIHA IMOM08-679).

If ceiling tile has dried out lightly mist before removal.

3.4 DETAILED SEQUENCE OF WORK FOR MOLD REMOVAL UNDER

CONTAINMENT

a. Preparation for Remediation Work

i. Provide level of containment and PPE required for the remediation based on the Microbial Remediation Plan.

ii. Disable all HVAC units and exhaust fans in the area to be remediated.

iii. Remove undamaged materials from the work area if they are to be salvaged but cannot be cleaned in place. Store materials in an area with relative humidity maintained below 60 percent (IHFOM, CH 13, Sec.3)

SECTION 02 85 00 . PAGE 11 OF 17

and where temperatures shall not damage the material. Notify Contracting Officer of existing damage to items prior to removal. Clean materials using procedures detailed in Remediation Procedures.

iv. Remove supply diffusers, return grilles and exhaust grilles. Clean diffusers and grilles using procedures detailed in Remediation Procedures.

v. Construct containment barriers. Existing walls can be used as a portion of the containment barriers if existing openings in walls (such as doors, wall openings, vents) are sealed using 0.15 millimeter 6 mil polyethylene.

vi. Install the AFUs and dehumidifiers.

vii. Seal supply, return, and exhaust openings with 0.15 millimeter 6 mil polyethylene sheeting and protect intakes to air handling units. Air handling units are to remain off.

viii. Install all equipment needed for removal work in the containment area to minimize egress during demolition

ix. The COR shall inspect the containment to verify that the containment is properly constructed and the containment area has an overall negative pressure of 5 to 10 pascals 0.02 to 0.04 inch water column AIHA IMOM08-679 relative to the outside and adjacent work areas not undergoing active remediation, prior to beginning demolition work.

b. Demolition

i. Remove mold contaminated materials to be discarded. double bag material in 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) poly bags. Seal poly bags using duct tape inside the containment. HEPA vacuum bags before removing them from the containment or airlock. When possible, pass the bags directly from the containment or airlock to the outside. Transport bags to a dumpster. Do not leave the bags at the building / house.

ii. Lightly mist all contaminated materials that are being discarded to minimize generation of airborne mold spores during demolition/removal.

iii. Remove contaminated gypsum wallboard (GWB) at the preliminary limits of demolition specified in the Microbial Remediation Plan. Inspect back side of removed GWB. If mold is observed on the back side of the GWB, report this condition to the Contracting Officer. After obtaining Contracting Officer approval, continue removing GWB until no mold is observed. If hidden mold is discovered that shall extend past the extents of the containment, stop work immediately and reconstruct the containment to extend past the suspected contamination. Re-evaluate

SECTION 02 85 00 . PAGE 12 OF 17

level of containment and PPE. Continue to operate AFUs during reconfiguring of containment.

iv. Remove drywall by cutting in pieces as large as possible to minimize aerosolization of fungal spores. Drywall screws can either be backed out during removal or later during cleanup.

v. Use dust collection attachments on all power tools, such as sanders, saws, to capture dust created when using the tools. Outlet of dust collector should discharge into inlet of AFU.

vi. Remove fiberglass insulation behind removed gypsum board.

vii. If wood studs are contaminated, HEPA vacuum all surfaces, scrub them with a brush and detergent to remove mold. After scrubbing studs, HEPA vacuum again to remove any remaining dust. Replace wood studs with damage severe enough to reduce the structural capacity of the member.

Prior to removal of any structural member consult with the Contracting Officer.

viii. Clean all metal framing with a dilute detergent solution. Clean metal framing with light rust using steel wool and coat with a rust inhibiting paint. Replace metal framing with rust damage severe enough to reduce the structural capacity of the member. Prior to removal of any structural material, consult with the Contracting Officer.

ix. Remove contaminated carpet in coordination with COR.

x. Place removed gypsum board, insulation, carpet and remaining debris in two layers of 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) poly bags.

Seal poly bags using duct tape inside the containment. HEPA vacuum bags before removing them from the containment or airlock. When possible pass the bags directly from the containment or airlock to the outside. Transport bags to a dumpster. Do not leave the bags at the building / house.

xi. Remediation workers shall HEPA vacuum their PPE, then remove their

PPE within the airlock chamber. Discard disposable coverall suits into a

0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) poly bag.

c. Post-Demolition Inspection

i. The COR shall inspect the containment area to verify that all contaminated materials have been removed.

SECTION 02 85 00 . PAGE 13 OF 17

ii. Allow a minimum of 12-hours after completion of removal work, with AFUs operating, for airborne dust in the containment to settle or be removed by the AFUs.

d. Cleaning after Demolition, and Cleaning of Settled Spores from Porous / Non-

Porous Materials

i. Continue to operate AFUs during cleaning.

ii. Clean exposed surfaces.

2) Damp wipe all non-porous exposed surfaces including polyethylene sheets used to protect materials, external surfaces of ductwork, studs, and floors with clean rag and clean potable water or detergent solution.

3) Remove poly sheeting inside the containment.

4) HEPA vacuum all surfaces protected by poly sheeting.

5) Damp wipe non-porous surfaces protected by poly sheeting with clean water or a detergent solution.

6) Clean carpet using procedures previously specified.

iii. Final clearance inspection shall be conducted by the COR. Clearance inspections shall be performed using the procedures detailed in Post- Remediation Inspection. If areas fail final clearance inspections, additional corrective actions taken by the contractor shall be at no additional cost to the Government. Maintain containments in place until spaces are inspected and accepted by the Government as being fully remediated. The Government shall determine whether additional cleaning is required by the Contractor and whether the clearance process shall be repeated.

3.5 DUCT AND HVAC SYSTEM CLEANING

a. Contractor Qualifications

i. The HVAC cleaning contractor shall be a certified member of NADCA.

ii. The HVAC cleaning contractor shall have at least one individual with Ventilation System Mold Remediator Qualifications certified by NADCA onsite during duct and HVAC system cleaning.

SECTION 02 85 00 . PAGE 14 OF 17

b. Inspection

i. CIH shall visually inspect the HVAC system serving all work areas, and determine if additional remediation is needed to clean the HVAC system, thus preventing re-contamination. Coordinate inspection with the contracting officer. Notify the Contracting Officer of the inspection results. The Contractor shall receive written approval from the Contracting Officer before proceeding with HVAC microbial remediation.

c. VAC Microbial Remediation: Conduct the following actions if authorized by the

COR.

i. Follow requirements of the NADCA ACR "Standard for Assessment, Cleaning, and Restoration of HVAC Systems".

ii. Using a "gassing" or "fogging" method of cleaning, the use of gaseous chlorine dioxide or ozone is not allowed.

iii. Disable all HVAC equipment prior to cleaning any component of the system.

iv. Cleaning the air handling units, terminal units, blowers and exhaust fans:

1) Construct a limited containment around equipment to be cleaned.

Provide appropriate PPE for workers.

2) Remove filters. Seal filters in 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) poly bags for disposal.

3) Disassemble units as necessary to clean components. Contractor is responsible for correctly reassembling equipment after cleaning.

4) Clean disassembled components within the containment or in a separate two chamber cleaning containment. Seal disassembled components in 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) poly bags for transport out of building / house. HEPA vacuum bags before removing them from the containment or airlock.

5) HEPA vacuum all surfaces.

6) Damp wipe all non-porous surfaces and components with clean water or a detergent solution.

v. Cleaning HVAC coils:

SECTION 02 85 00 . PAGE 15 OF 17

1) Clean coils using a method which shall render the coil visibly clean. Coil cleaners shall be non-acidic / alkaline, detergent based.

Clean condensate drain pans. The drain for the condensate drain pan shall be operational during the cleaning.

2) Rinse coils and drain pans with clean water to remove any latent residues.

3) Cleaning methods shall not cause damage to the coil surface or fins.

4) Cleaning shall restore the coil pressure drop to within 10 percent of the pressure drop measured when the coil was first installed. If the original pressure drop is not known, the coil is considered clean only if the coil is free of foreign matter and chemical residue.

vi. Cleaning the duct system:

1) During cleaning, connect a vacuum collection system to the downstream end of the section being cleaned. The vacuum collection device shall be of sufficient power to render all areas of duct being cleaned under negative pressure relative to rooms and areas of duct not being cleaned. Negative pressure shall be verified at the furthest point from the collection system with micromanometer and verification measurements included in the CIH daily report

2) Equip the vacuum collection systems with HEPA filters. Exhaust the vacuum collection systems directly to the outside.

3) Use mechanical agitation devices to dislodge debris adhered to the ductwork, such that debris may be safely conveyed to vacuum collection devices. Cleaning methods shall not damage the integrity of the ductwork, nor damage porous surface materials such as liners inside the ductwork.

4) HEPA vacuum duct surfaces.

5) When possible, damp wipe metal duct surfaces with clean water or detergent solution. Do not wet fibrous glass thermal or acoustical insulation.

6) Identify areas where there is evidence of damage to or uncleanable mold in duct insulation. The COR shall make the decision to discard the insulation, if necessary.

SECTION 02 85 00 . PAGE 16 OF 17

vii. Final clearance of HVAC and duct system shall be based on a visual assessment (no visible dust, no visible mold) by COR. If HVAC fails final clearance inspection, additional corrective actions taken by the contractor shall be at no additional cost to the Government.

3.6 FIRE PROTECTION: Provide portable fire extinguishers within the containment area and outside the decontamination unit. Fire extinguishers shall be rated for the class of fire hazards in the work area and shall be sized for coverage of the areas within the containment. At a minimum, one 10 pound ABC fire extinguisher for every 1,000 square feet shall be strategically placed around the containment. Personnel shall be trained for emergency egress and the use of fire extinguishers. Notify fire officials of work activities as required. IICRC S500

3.7 CONSTRUCTION BARRIERS:

a. Provide interior shoring, bracing, or support to prevent movement, settlement, or collapse of structure or element to be demolished and adjacent facilities or work to remain. Shoring, bracing or support shall be necessary when structural wood studs or metal framing need to be removed and replaced when they cannot be cleaned.

b. Do not disturb microbial-contaminated building materials while isolating work areas. This precaution prevents the release of microbial spores.

c. Workers shall wear respirators and other PPE as outlined in the microbial remediation plan when installing critical barriers where microbial contaminated surfaces (walls or surfaces with visible settled dusts) are likely to be disturbed.

Operate an AFU if disturbance is likely during setup.

d. Monitor the air pressure differential across work area containments. The monitoring system shall be in place before the start of remedial activities.

Verification by the Industrial Hygienist is required prior to the start of the microbial remediation.

3.8 WASTE MANAGEMENT AND REMOVAL: Keep the site and work area free from accumulations of dust, waste materials, or rubbish caused by Contractor operations and free from any flammable materials or other sources of fire hazard. Remove all waste materials and rubbish from and about the work site in strict accordance with the specifications and applicable codes and regulations.

3.9 POST-REMEDIATION INSPECTION: Clean up all debris and dust in interior spaces outside the work area resulting from the Contractor's remediation work.

After all visible accumulations of material and debris are removed from the containment, provide the COR a 24-hour notice for a final clearance visual inspection. The COR and Contractor's CIH shall conduct a thorough visual inspection of the work area. If during

SECTION 02 85 00 . PAGE 17 OF 17

this inspection any visible debris or microbial contamination are observed, the Contractor shall re-clean the work area without additional cost to the Government.

3.10 CLEARANCE: Clearance shall be based on visual assessment (all visible mold removed, all visible dust removed, based on a "white glove" test) by COR Officer. "White glove" test shall consist of wiping the surface with a clean cloth of color suitable to reveal expected type of dust. For most surfaces, a white cloth is suitable. For GWB dust, a dark cloth may be more appropriate.

a. Failed remediation areas shall be recleaned at no additional cost to the Government and the AFUs kept in operation another 12-hours, followed by another visual assessment. Subsequent failures shall follow the same routine until a pass condition is secured.

3.11 CLEAN-UP AND DISPOSAL

a. Disposal of Material: Dispose of contaminated bagged waste materials removed during this remediation as general construction debris. Follow all applicable local, State, and Federal requirements for the disposal of this material.

b. Material Packaging: Place waste, as waste is removed, into a disposal container promptly. Disposal containers shall consist of at a minimum, two layers of clear

0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) polyethylene bags. Tape bags in a gooseneck fashion to form an airtight seal and label appropriately. Bag waste from vacuums equipped with HEPA filters in 0.15 millimeter 6 mil (IHFOM, CH 13, Sec. 3) polyethylene bags.

c. Building Exit (Waste Disposal): HEPA vacuum and damp wipe bags of contaminated waste material prior to removal from the building. When possible pass the bags directly from the containment or airlock to the outside. Transport bags to a dumpster.

d. Hazardous Material: Should the Contractor encounter any hazardous materials, notify the Contracting Officer immediately for direction.