FACILITIES ENVIRONMENTAL TECHNICAL UNIT SPECIAL CONSTRUCTION WATER INTRUSION AND MOLD REMEDIATION PROCEDURE
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1 Los Angeles Unified School District Facilities Services Division FACILITIES ENVIRONMENTAL TECHNICAL UNIT SPECIAL CONSTRUCTION WATER INTRUSION AND MOLD REMEDIATION PROCEDURE
2 FACILITIES ENVIRONMENTAL TECHNICAL UNIT SPECIAL CONSTRUCTION WATER INTRUSION AND MOLD REMEDIATION PROCEDURE Table of Contents I. INTRODUCTION Page 3 II. DEFINITIONS. Page 4 III. POTENTIAL HEALTH EFFECTS.. Page 6 IV. PREVENTION & REMEDIATING BUILDING MATERIALS Page 6 V. CLEANUP METHODS Page 7 VI. PERSONAL PROTECTIVE EQUIPMENT (PPE).. Page 7 VII. CONTAINMENT. Page 7 VIII. INSPECTION, ASSESSMENT AND SAMPLING Page 7 IX. DRY-OUT OF WATER/MOISTURE IMPACTED MATERIALS Page 8 X. REMEDIATION OF MOLDY SURFACES... Page 8 XI. LEVEL I: SMALL ISOLATED AREAS (10 CONTIGUOUS SQ FT.).. Page 9 XII. LEVEL II: MID-SIZED ISOLATED AREAS ( CONTIGUOUS SQ. FT.) Page 10 XIII. LEVEL III: EXTENSIVE CONTAMINATION (GREATER THAN 100 CONTIGUOUS SQ. FT.)... Page 10 XIV. HOW DO YOU KNOW WHEN YOU HAVE FINISHED REMEDIATION/CLEANUP. Page 11 XV. HAZARD COMMUNICATION AND NOTIFICATION. Page 11 XVI. CONCLUSION Page 12 APPENDIX A TABLE 1: WATER DAMAGE - CLEANUP AND MOLD PREVENTION. Page 13 APPENDIX B TABLE 2: GUIDELINES FOR REMEDIATING BUILDING MATERIALS WITH MOLD GROWTH CAUSED BY CLEAN WATER... Page 14 APPENDIX C TABLE 3: TIMETABLE THE ON-GOING EFFECTS OF WATER DAMAGE Page 16 APPENDIX D AIR SAMPLING GUIDELINES FOR FINAL AIR MONITORING AND BACKGROUND AIR SAMPLING (WHEN DETERMINED IT IS NEEDED).. Page 17 APPENDIX E WATER REMEDIATION FIELD FORMS AND EQUIPMENT LIST... Page 18 2
3 FACILITIES ENVIRONMENTAL TECHNICAL UNIT SPECIAL CONSTRUCTION WATER INTRUSION AND MOLD REMEDIATION PROCEDURE The information contained within this manual has been compiled from the following reference sources: The Environmental Protection Agency (EPA), The Centers for Disease Control (CDC), The California Department of Public Health (CA CDPH), The New York Department of Health Services (NYDHS), American Conference of Governmental Industrial Hygienist (ACGIH), Institute of Inspection, Cleaning and Restoration (IICRC), Guidelines for the Assessment of Bioaerosols in the Indoor Environment, American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE), The City of Los Angeles, and the California Department of Occupational Safety and Health (CA DOSH). Please note that this document presents recommendations water intrusion remediation procedure(s) and mold assessment and remediation. Currently there are no United States Federal, California State or Los Angeles City regulations for evaluating potential health effects of fungal contamination and remediation. These guidelines are subject to change as more information regarding fungal contaminants becomes available. I. INTRODUCTION Molds are a group of organisms that belong to the kingdom Fungi. Fungi are neither animals nor plants and are classified in a kingdom of their own. Fungi include molds, yeasts, mushrooms and puffballs. Molds live in the soil, on plants, and on dead or decaying matter. Molds are found in virtually every environment and can be detected, indoors and outdoors, year round. You are exposed to them daily in the air you breathe. Molds lack chlorophyll and must survive by digesting plant and other organic materials for food. Without molds, our environment would be overwhelmed with large amounts of dead plant matter. Molds make tiny spores to reproduce, just as some plants produce seeds. These mold spores can be found in both indoor and outdoor air, and settled on indoor and outdoor surfaces. When mold spores land on a damp spot, they may begin growing and digesting whatever they are growing on in order to survive. Since molds gradually destroy the things they grow on, you can prevent damage to building materials and furnishings and save money by eliminating mold growth. Moisture control is the key to mold control. Molds need both food and water to survive: since molds can digest most things, water is the factor that limits mold growth. Molds will often grow in damp or wet areas indoors. Typical sites for indoor mold growth include bathroom tile grout, basement walls, areas around windows where moisture condenses, and near leaky water fountains or sinks. Common sources or causes of water or moisture problems include roof leaks, deferred maintenance, condensation associated with high humidity or cold spots in the building, localized plumbing failures or heavy rains, slow leaks in plumbing fixtures, and malfunction or poor design of humidification systems. Uncontrolled humidity can also be a source of moisture leading to mold growth, particularly in hot, humid climates, such as ceiling spaces and wall voids. 3
4 II. DEFINITIONS AIR HANDLING UNIT (AHU): Equipment that includes a blower or fan, heating and/or cooling coils, and related equipment such as controls, condensate drain pans, and air filters. Does not include ductwork, registers, grilles, boilers and chillers. ALLERGEN: A substance, such as mold, that can cause an allergic reaction. ANTIMICROBIAL: Agent that kills microbial growth (i.e., chemical or substance that kills mold or other organisms). See "Biocide" and "Fungicide." BIOLOGICAL CONTAMINANTS: 1) Living organisms, such as viruses, bacteria, or mold (fungi), 2) the remains of living organisms, or 3) debris from or pieces of dead organisms. Biological contaminants can be small enough to be inhaled, and may cause many types of health effects including allergic reactions and respiratory disorders. BIOCIDE: A substance or chemical that kills organisms such as mold (such as sterilizers, disinfectants, and sanitizers). BUILDING ENVELOPE: Elements of the building, including all external building materials, windows, and walls, that enclose the internal space. CEILING PLENUM: Space between a suspended ceiling and the floor above that may have mechanical and electrical equipment in it and that is used as part of the air distribution system. The space is usually designed to be under negative pressure. DISINFECTANTS: Any chemical agent used primarily on inanimate objects to destroy or inhibit the growth of harmful organisms. FUNGI: A separate kingdom comprising living things that are neither animals nor plants. The kingdom Fungi includes molds, yeasts, mushrooms, and puffballs. In this course, the terms fungi and mold are used interchangeably. FUNGICIDE: A substance or chemical that kills fungi. HEPA: High efficiency particulate air (filter). HVAC: Heating, ventilation, and air-conditioning system. HYPERSENSITIVITY: Great or excessive sensitivity. HYPERSENSITIVITY PNEUMONITIS: A group of respiratory diseases that cause inflammation of the lung (specifically granulomatous cells). Most forms of hypersensitivity pneumonitis are caused by the inhalation of organic dusts, including molds. MOLD: A group of organisms that belong to the kingdom Fungi. In this course, the terms fungi and mold are used interchangeably. 4
5 MVOC (microbial volatile organic compound): A chemical made by mold that is a gas at room temperature and may have a moldy or musty odor. MYCOTOXIN: A toxin produced by a mold. NEGATIVE PRESSURE: A condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas. Under this condition, if an opening exists, air will flow from surrounding areas into the negatively pressurized space. PLENUM: Air compartment connected to a duct or ducts. PRESSED WOOD PRODUCTS: A group of materials used in building and furniture construction that are made from wood veneers, particles, or fibers bonded together with an adhesive under heat and pressure. REMEDIATE: Fix. SANITIZERS: A substance or preparation for killing germs, designed for use especially on foodprocessing equipment. SPORE: The means by which molds reproduce. Spores are microscopic. They vary in shape and range from 2 to 100 microns in size. Spores travel in several ways: passively moved by a breeze or water drop, mechanically disturbed (by a person or animal passing by), or actively discharged by the mold (usually under moist conditions or high humidity). STERILIZERS: To destroy microorganisms in or on, usually by bringing to a high temperature with steam, dry heat, or boiling liquid. TOXIGENIC: Producing toxic substances. WATER CATEGORIES: definitions of water contamination offer three general categories: Category 1: Category 2: Category 3: (Clean Water) - Originates from a source that does not pose substantial harm to humans. Examples include broken water supply lines, tub or sink overflows without contaminants, melting ice or snow, falling rainwater, broken toilet tanks/bowls without contaminants, etc. (Gray Water) - Contains a significant level of contamination and has the potential to cause discomfort or sickness if consumed by or exposed to humans. Examples include discharge from dishwashing or washing machines, overflows from toilet bowls with some urine (no feces), sump pump failures, seepage due to hydrostatic pressure, broken aquariums, punctured water beds, etc. (Black Water) - Contains pathogenic agents and is grossly unsanitary. Examples include sewage, toilet backflows from beyond the trap, and all flooding from seawater, surface waters, rivers, streams, etc. 5
6 III. POTENTIAL HEALTH EFFECTS Molds can cause a variety of health problems such as allergic reactions, fungal infections, skin irritation, and aggravation of asthma symptoms. The types and severity of symptoms depend, in part, on the types of mold present, the extent of an individual s exposure, the ages of the individuals, and their existing sensitivities or allergies. Most workers will not be affected by molds. In almost all cases of allergic or other illnesses, the symptoms are temporary. A small percentage of people may experience longer recovery times. It must be pointed out that the symptoms described for exposure to mold can also be due to other causes such as bacterial or viral infections, or other allergies. Mold is also known to cause opportunistic infections to people with weaken immune systems (i.e., immune-compromised or immunesuppressed individuals). Therefore, it is important to consult your doctor if you are concerned about your health. Mold spores are microscopic (2-10 um) and are naturally present in both indoor and outdoor air. Molds reproduce by means of spores. Some molds have spores that are easily disturbed and waft into the air and settle repeatedly with each disturbance. Other molds have sticky spores that will cling to surfaces and are dislodged by brushing against them or by other direct contact. Spores may remain able to grow for years after they are produced. In addition, whether or not the spores are alive, the allergens in and on them may remain allergenic for years. IV. PREVENTION & REMEDIATING BUILDING MATERIALS The key to mold control is moisture control. Solve moisture problems before they become mold problems! With this concept in mind, the Facilities Technical Unit (FETU) is responsible to ensure mold prevention tips are practiced: Fix leaky plumbing and leaks in the building envelope as soon as possible. Watch for condensation and wet spots. Fix source(s) of moisture problem(s) as soon as possible. Maintain indoor humidity below 60% relative humidity (RH). ASHRAE standard recommends indoor RH to be maintained between 30%-60%. Keep HVAC drip pans clean, flowing properly, and unobstructed. Perform regularly scheduled building/hvac inspections and maintenance. Clean and dry wet or damp spots within 48 hours. Provide drainage and slope the ground away from the foundation. Don t let foundations stay wet. In cases of emergency water intrusion (i.e. flooding) it is imperative that the following strategies presented in Tables 1 and 2 attached in Appendix A and B (taken from the EPA Guidelines to Mold Remediation in Schools and Commercial Buildings) are used within hours. These guidelines are designed to help avoid the need for mold remediation by taking quick action before growth starts. Depending on the size of the area involved and resources available the responsible maintenance department may need to seek the professional assistance to dry the area as quickly as possible. 6
7 V. CLEANUP METHODS Method 1: Wet vacuum (in the case of porous materials, some mold spores/fragments will remain in the material but will not grow if the material is completely dried). Steam cleaning may be an alternative for carpets and some upholstered furniture. Method 2: Damp-wipe surfaces. Method 3: High-efficiency particulate air (HEPA) vacuum after the material has been thoroughly dried. Dispose of the contents of the HEPA vacuum in well-sealed plastic bags. Method 4: Discard - remove water-damaged materials and seal in plastic bags while inside of containment, if present. Dispose of as normal waste. HEPA vacuum area after it is dried. VI. PERSONAL PROTECTIVE EQUIPMENT (PPE) Minimum: Gloves, appropriate respirator, goggles/eye protection Limited: Gloves, appropriate respirator with P100 filters and disposable coveralls, goggles/eye protection Full: Gloves, disposable full body clothing, head gear, foot coverings, and full-face respirator with HEPA filter VII. CONTAINMENT Limited: Full: Use 4-mil or 6-mil fire-retardant polyethylene sheeting ceiling to floor around affected area with a slit entry and covering flap; maintain area under negative pressure with HEPA filtered fan unit. Block supply and return air vents within containment area. Use two layers of 4-mil or 6-mil fire-retardant polyethylene sheeting with one airlock chamber. Maintain area under negative pressure with HEPA filtration exhausted outside of building. Block supply and return air vents within containment area. Footnotes: Please note that Table 1 and Table 2 contain general guidelines. Their purpose is to provide basic information for remediation managers to first assess the extent of the damage and then to determine whether the remediation should be managed by in-house personnel or outside professionals. The remediation manager can then use the guidelines to help design a remediation plan or to assess a plan submitted by outside professionals. If the water intrusion source/cause is not identified and repaired/eliminated, then mold growth can occur. Control the water / moisture and you control the mold. VIII. INSPECTION, ASSESSMENT AND SAMPLING The presence of mold, water damage, or musty odors should be addressed immediately. A visual inspection is the most important initial step in identifying the problem. The extent of any water damage and mold growth should be visually assessed. This assessment is important in determining remedial strategies. Common assessment tools used here at LAUSD are the FLIR infrared camera used in conjunction with a moisture meter. When a request submitted to the FETU (containing pertinent data as to the water intrusion location, source, (if known), estimated size of the water intrusion within the location), the form A (from the Asbestos Management Plan) and site drawing(s) are obtained to support the inspector in the field. 7
8 Typical Inspection Steps: 1. Visually check for obvious water / moisture sources and eliminate prior to scheduling any remediation efforts. 2. Visually scan the building infrastructure; both with and without the infrared camera to determine the extent of the water damage and to determine the type of building materials impacted by the water damage. 3. If needed, use tools, i.e. boroscope, knifes, and saws to gain visual access to concealed or difficult locations. Ventilation systems should also be visually checked when appropriate, particularly for damp filters but also for damp conditions elsewhere in the system and overall cleanliness. Ceiling tiles, gypsum wallboard (sheetrock), cardboard, paper, and other cellulosic surfaces should be given careful attention during the visual inspection. Depending on the existing condition of these cellulosic surfaces and the extent of moisture intrusion along with site location and needs, will determine the type of remediation needed. Bulk or surface sampling is not required to undertake a remediation. Remediation (as described in the Remediation section) of visually identified fungal contamination should proceed without further evaluation. Air sampling for molds should not be a part of a routine assessment as well. This is because decisions about appropriate remediation strategies can usually be made on the basis of a visual inspection. Regardless what type of mold is present you should arrange for its removal. Regulations for determining what a permissible limit of mold in the air is have not been established. Air sampling methods for some fungi are prone to false negative results and therefore cannot be used to definitively rule out contamination. Although under certain circumstances sampling may need to be collected. Always remember to consider all other environmental factors when establishing the type of remediation efforts. IX. DRY-OUT OF WATER/MOISTURE IMPACTED MATERIALS Once the source of the water intrusion / moisture has been eliminated, the dry-out process can commence utilizing a various types of equipment, such as dehumidifiers, high velocity blowers and blower injectors. The installation of this equipment will depend on the quantity and type of substrate material, surface material, insulation factors, access and available power. The site and the water loss location may also be a determining factor in the dry-out effort. Professional judgment and experience with various types of building construction is an important factor when determining the dry-out strategy. X. REMEDIATION OF MOLDY SURFACES In all situations, the underlying cause of water accumulation must be rectified or fungal growth will occur. Any initial water intrusion or moisture infiltration should be stopped and cleaned immediately. An immediate response (within 48 hours) and thorough clean up, drying, and/or removal of water damaged materials will prevent or limit mold growth. If the source of moisture is elevated humidity, relative humidity should be maintained at levels below 60% to inhibit mold growth. 8
9 Emphasis should be on ensuring proper repairs of the building infrastructure, so that water damage and moisture buildup does not recur. Three levels of remediation are described below. The size of the area impacted by fungal growth primarily determines the type of remediation. The sizing levels listed are based on professional judgment and practicality. Currently there is not adequate data to relate the extent of contamination to frequency or severity of health effects. The goal of remediation is to remove or clean contaminated materials in a way that prevents the emission of fungi and dust contaminated with fungi from leaving a work area and entering an occupied or non-remediation area, while protecting the health of workers performing the remediation. The listed remediation methods were designed to achieve this goal, however, due to the general nature of these methods it is the responsibility of the individuals conducting remediation to ensure the methods enacted are adequate. The listed remediation methods are not meant to exclude other similarly effective methods. Any changes to the remediation methods listed in these guidelines, however, should be carefully considered prior to implementation. Non-porous (e.g., metals, glass, and hard plastics) and semi-porous (e.g., wood, and concrete) materials that are structurally sound and are visibly moldy can be cleaned and reused. Porous materials such as ceiling tiles and insulation, and wallboards with more than a small area of contamination should be removed and discarded. Porous materials (e.g., wallboard and fabrics) that can be cleaned, can be reused, but should be discarded if possible. All materials to be reused should be dry and visibly free from mold. Routine inspections should be conducted to confirm the effectiveness of remediation work. The use of gaseous, vapor-phase, or aerosolized biocides for remedial purposes are not recommended. The use of biocides in this manner can pose health concerns for people performing the remediation as well as for people returning to the treated space if used improperly. Furthermore, the effectiveness of these treatments is unproven and does not address the possible health concerns from the presence of the remaining non-viable mold. The purpose of mold remediation is to reduce / prevent human exposure and damage to building materials and furnishings. It is necessary to remove the mold contamination, not just to kill the mold. Dead mold is still allergenic, and some dead molds are potentially toxic. In most cases, it is not possible or desirable to sterilize an area; a background level of mold spores will remain in the air. These spores will not grow if the moisture problem in the building has been resolved. Remediation efforts should be conducted during non-business hours whenever feasible. XI. LEVEL I: SMALL ISOLATED AREAS (10 CONTIGUOUS SQ. FT. OR LESS) The following procedures at a minimum are recommended: Regular building maintenance staff can conduct remediation. Such persons should receive training on proper cleanup methods, personal protection, and potential health hazards. This training can be performed as part of a program to comply with the requirements of the Cal-OSHA Hazard Communication Standard. Respiratory protection (appropriate respirator) in accordance with the Cal-OSHA (Title 8, Section 5144) respiratory protection standard is recommended. Gloves and eye protection should be worn. (Disposable coveralls are optional.) The immediate work area should be unoccupied. Vacating people from spaces adjacent to the work area is not necessary but is recommended. 9
10 Containment of the work area is not necessary. Dust suppression methods, such as misting (not soaking) surfaces prior to remediation or sealing contaminated surfaces prior to removal, are recommended. Contaminated materials that cannot be cleaned should be removed from the building in a sealed plastic bag. There are no special requirements for the disposal of moldy materials. The work area and area used by remedial workers for egress should be cleaned with a damp cloth and/or mop with a detergent solution. All areas should be left dry and visibly free from contamination and debris. XII. LEVEL II: MID-SIZED ISOLATED AREAS ( CONTIGUOUS SQ. FT.) The following procedures at a minimum are recommended: Regular building maintenance staff can conduct remediation. Such persons should receive training on proper clean-up methods, personal protection, and potential health hazards. This training can be performed part of a program to comply with the requirements of the Cal-OSHA Hazard Communication Standard. Respiratory protection (e.g., appropriate respirator with P-100 filters), in accordance with the Cal- OSHA respiratory protection standard, is recommended. Glove, eye protection and disposable protective coveralls should be worn. The immediate work area should be unoccupied. Vacating people from spaces adjacent to the work area is not necessary. Cover using 4-mil or 6-mil fire-retardant polyethylene sheeting from ceiling to floor affected area with a slit entry and covering flap; maintain area under negative pressure with HEPA equipped unit exhausted to the outside. Block supply and return vents within containment area. Dust suppression methods, such as misting (not soaking) surfaces prior to remediation or sealing contaminated surfaces prior to removal, are recommended. Contaminated materials that cannot be cleaned should be removed from the building in a sealed 6- mil plastic bag. There are no special requirements for the disposal of moldy materials. The work area and areas used by remedial workers for egress should be HEPA vacuumed and cleaned with a damp cloth and/or mop with a detergent solution. All areas should be left dry and visibly free from contamination and debris. XIII. LEVEL III: EXTENSIVE CONTAMINATION (GREATER THAN 100 CONTIGUOUS SQ. FT.) The following procedures at a minimum are recommended: Personnel trained in the handling of hazardous materials equipped with half face negative pressure air purifying respirator with P-100 HEPA filters or full-face respirators with HEPA cartridges (in accordance with Cal-OSHA respiratory protection standard) and disposable protective clothing covering both head and shoes should perform the work. Containment of the affected area: should include complete isolation of work area from occupied spaces using plastic sheeting sealed with duct tape (including ventilation ducts/grills, fixtures, and any other openings). The use of an exhaust fan with a HEPA filter to generate negative pressurization and airlocks and decontamination room should be used during the remediation. Contaminated materials that cannot be cleaned should be removed from the building in a sealed plastic bag. There are no special requirements for the disposal of moldy materials. 10
11 The immediate work area should be unoccupied. Vacating people from spaces adjacent to the work area is not necessary but is recommended. The outside of the bags should be cleaned with a damp cloth and a detergent solution or HEPA vacuumed in the decontamination chamber prior to their transport to uncontaminated areas of the building. The contained area and decontamination room should be HEPA vacuumed and cleaned with a damp cloth and/or mop with a detergent solution and be visibly clean prior to the removal of isolation barriers. If necessary or if recommended for air monitoring, using NIOSH protocols for bio-aerosols should be conducted prior to occupancy to determine if the area is fit to reoccupy. NOTE: Although the level of personal protection, engineering controls and work practices suggested in these guidelines is based on the total surface area contaminated and the potential for remediator and/or occupant exposure, professional judgment should always play a part in the remediation decisions. These remediation guidelines are based on the size of the affected area to make it easier for remediators to select appropriate techniques, not on the basis of health effects or research showing there is a specific method appropriate at a certain number of square feet. The guidelines have been designed to help construct a remediation plan. The remediation manager will then use professional judgment and experience to adapt the guidelines to particular situations. XIV. HOW DO YOU KNOW WHEN YOU HAVE FINISHED REMEDIATION/CLEANUP There is no easy answer. Ultimately this is a judgment call. The following conditions must first be met prior to clearing an area for re-occupancy: You must have completely fixed the water or moisture problem. Water damaged materials should be dried or removed as verified by moisture readings. You should complete mold removal. Visible mold, mold damaged materials, and moldy odors should not be present. If you have sampled, the kinds and concentrations of mold and mold spores in the building should be similar to those found outside, once cleanup activities have been completed. (Note: See appendix C for air sampling guidelines on remediation projects greater than 100 square feet). You should revisit the site shortly after remediation, and it should show no signs of water damage or mold growth. XV. HAZARD COMMUNICATION AND NOTIFICATION: Communication with building occupants is essential for successful mold remediation. Small remediation efforts will usually not require a formal communication process, but do be sure to take individual concerns seriously and use common sense when deciding whether formal communications are required. When fungal growth requiring large-scale remediation is found, the remediation manager should notify occupants on the affected area(s) of its presence. Notification should include a description of the remedial measures to be taken and a timetable for completion. Group meetings held before and after remediation with full disclosure of plans and results can be an effective communication mechanism. Try and resolve issues and occupant concerns as they arise. 11
12 The five steps listed below should be followed while communicating during remediation: Notify as immediate as possible the appropriate Complex Project Manager (CPM) for direction of the proper Chain of Command. Establish that the health and safety of building occupants are top priorities. Demonstrate that the occupants concerns are understood and taken seriously. Present clearly the current status of the investigation or remediation efforts. Identify a person whom building occupants can contact directly to discuss questions and comments about the remediation activities. When building-wide communications are frequent and open, those managing the remediation can direct more time toward resolving the problem and less time to responding to occupant concerns. XVI. CONCLUSION In summary, the prompt remediation of wet or mold contaminated material and infrastructure repair must be the primary response to the school facilities. The simplest and most expedient remediation that properly and safely removes fungal growth from buildings should be used. In all situations, the underlying cause of water accumulation must be rectified or the fungal growth will recur. Emphasis should be placed on preventing contamination through proper building maintenance and prompt repair of water damaged areas. Most important Effective communication with building occupants is an essential component of all remedial efforts. 12
13 APPENDIX A TABLE 1 TABLE 1: WATER DAMAGE - CLEANUP AND MOLD PREVENTION Guidelines for Response to Clean Water Damage within Hours to Prevent Mold Growth WATER-DAMAGED MATERIAL Books and papers Carpet and backing - dry within hours Ceiling tiles Cellulose insulation Concrete or cinder block surfaces Fiberglass insulation (Exposed) Hard surface, porous flooring (Linoleum, ceramic tile, vinyl) Non-porous, hard surfaces (Plastics, metals) Upholstered furniture Wallboard (Drywall and gypsum board) Window drapes Wood surfaces ACTIONS Discard all books and papers. (Be sensitive to damaged materials. Obtain prior approval from CPM and Site Administrator. Photocopy valuable/important items, discard originals.) Remove water with water extraction vacuum. Reduce ambient humidity levels with dehumidifier. Accelerate drying process with blowers. Discard and replace. Discard and replace. Remove water with water extraction vacuum. Accelerate drying process with dehumidifiers, blowers, and/or cool air. Let dry. Vacuum and allow to air dry. Check to make sure under-flooring is dry; dry under-flooring if necessary. Vacuum and allow to air dry. Remove water with water extraction vacuum. Accelerate drying process with dehumidifiers, blowers, and/or cool air. If difficult to completely dry within 48 hours, dispose of. May be dried in place if there is no obvious swelling and the seams are intact. If not, remove, discard, and replace. Ventilate the wall cavity, if possible. Follow laundering or cleaning instructions recommended by the manufacturer. Remove moisture immediately and use dehumidifiers, gentle heat, and blowers for drying. If mold growth has occurred or materials have been wet for more than 48 hours, consult Table 2 guidelines. Even if materials are dried within 48 hours, mold growth may have occurred. Note that mold growth will not always occur after 48 hours; this is only a guideline. These guidelines are for damage caused by clean water. If you know or suspect that the water source is contaminated with sewage, or chemical or biological pollutants, then Personal Protective Equipment and containment are required by OSHA. Do not use blowers before determining that the water is clean or sanitary. If a particular item(s) has high monetary or sentimental value, you may wish to consult a restoration/water damage specialist. The subfloor under the carpet or other flooring material must also be cleaned and dried. See the appropriate section of this table for recommended actions depending on the composition of the subfloor. 13
14 APPENDIX B TABLE 2 TABLE 2: GUIDELINES FOR REMEDIATING BUILDING MATERIALS WITH MOLD GROWTH CAUSED BY CLEAN WATER Material or Furnishing Affected Cleanup Methods Personal Equipment SMALL - Total Surface Area Affected Less Than 10 square feet (ft 2 ) Books and papers 4 Carpet and backing 1, 3, 4 Concrete or cinder block 1, 3 Hard surface, porous flooring (linoleum, ceramic tile, vinyl) Non-porous, hard surfaces (plastics, metals) 1, 2, 3 1, 2, 3 Upholstered furniture & drapes 1, 3, 4 Wallboard (drywall and gypsum board) 3, 4 Wood surfaces 1, 2, 3 MEDIUM - Total Surface Area Affected Between 10 and 100 (ft 2 ) Books and papers 4 Carpet and backing 1,3,4 Concrete or cinder block 1,3 Hard surface, porous flooring (linoleum, ceramic tile, vinyl) Non-porous, hard surfaces (plastics, metals) 1,2,3 1,2,3 Upholstered furniture & drapes 1,3,4 Wallboard (drywall and gypsum board) 3,4 Wood surfaces 1,2,3 14 Protective Minimum - appropriate respirator with P-100 filters, gloves, and goggles Limited or Full Use professional judgment, consider potential for remediator exposure and size of contaminated area Containment None required Limited Use professional judgment, consider potential for remediator/occupant exposure and size of contaminated area LARGE - Total Surface Area Affected Greater Than 100 (ft 2 ) or Potential for Increased Occupant or Remediator Exposure During Remediation Estimated to be Significant Books and papers 4 Carpet and backing 1,3,4 Concrete or cinder block 1,3 Hard surface, porous flooring (linoleum, ceramic tile, vinyl) Non-porous, hard surfaces (plastics, metals) 1,2,3,4 1,2,3 Full Use professional judgment, consider potential for remediator/occupant exposure and size of contaminated area Full Use professional judgment, consider potential for remediator exposure and size of contaminated area
15 Upholstered furniture & drapes Wallboard (drywall and gypsum board) 1,2,4 3,4 Wood surfaces 1,2,3,4 Use professional judgment to determine prudent levels of personal protective equipment and containment for each situation, particularly as the remediation site size increases and the potential for exposure and health effects rises. Assess the need for increased personal protective equipment, if, during the remediation, more extensive contamination is encountered than was expected. Consult table 1 if materials have been wet for less than 48 hours, and mold growth is not apparent. These guidelines are for damage caused by clean water. I f you know or suspect that the water source is contaminated with sewage, or chemical or biological pollutants, stop work and contact Office of Environmental Health & Safety. Select method most appropriate to situation. Since molds gradually destroy the things they grow on, if mold growth is not addressed promptly, some items may be damaged such that cleaning will not restore their original appearance. If mold growth is heavy and items are valuable or important, (be sensitive to damaged materials and obtain prior approval from CPM and Site Administrator) prior to disposing of the item(s). Please note that these are guidelines; other cleaning methods may be preferred or suggested. 15
16 APPENDIX C TIMETABLE THE ON-GOING EFFECTS OF WATER DAMAGE Within minutes: Water contamination spreads to unaffected areas Moisture sensitive surfaces swell and disfigure Wood furniture stains carpet and is usually permanent (nylon and wool) Paper good are ruined Rust stains form on carpets and other surfaces Within hours: Pre-existing moisture related problems are activated Drywall swells Cellulosic browning may occur Foam cushion disintegrates Bacterial odor begins to develop Wood furniture in contact with water and high humidity can be permanently damaged to swelling, splitting and delamination Woven carpet could shrink Within days: Massive mold and biological growth take place; mildew odor begin begins to permeate structure Wood floors are warped and ruined Glue-down and double stick installations begin to come loose Delamination of tufted carpet possible Vinyl floor coverings can be permanently discolored and adhesives can begin to break down Components inside of pianos and organs begin to swell with moisture Allergies and asthma can be aggravated Pictures and artwork become affected Within weeks: Structural integrity of interior wall members, sub-floors, ceiling installations can be permanently damaged Mold can permanently damage natural materials Serious health hazards to occupants of buildings 16
17 APPENDIX D AIR SAMPLING GUIDELINES FOR FINAL AIR MONITORING AND BACKGROUND AIR SAMPLING (WHEN DETERMINED IT IS NEEDED) Prior to starting remediation project, background air samples should be taken for documentation and comparison purposes. Background samples should use the following guidelines. Use Zefon total spore cassettes. Run sample for 10 minutes at a flow rate of 15 liters per minute. Minimum 2, maximum - 5 samples per workspace based on the size of the remediation area. Locate samples evenly throughout the workspace. Include control sample from an unaffected area/space. Take one sample outdoors as near the HVAC intake as possible. Avoid foliage and standing water. Include 1 field blank in the sample set. After completion of the remediation and upon passing a thorough visual inspection air sampling for documentation to support a conclusive removal has occurred should take place. Air sampling should be done prior to removal of the containment and the HEPA negative air machines shall run (in negative pressure mode) for a minimum of 12 hours after completion of the removal prior to beginning sampling. The negative air machines shall be turned off for a minimum of 30 minutes prior to the start of sampling and shall remain off for the duration of the sampling. After the completion of the sampling the negative air machines can be turned back on until final results are in and clearance is given. The following is a list of guidelines to use in setting up the air-sampling plan: Use total spore (i.e. Zefon) cassettes. Run sample for 10 minutes. Use a pump set with a flow rate of 15 liters per minute. Minimum number of inside samples is 2 and maximum number of inside samples is 5 based on size of the remediation area. Location of inside samples should be evenly distributed throughout the workspace. 1 sample should be taken outdoors as near the HVAC intake as possible. Avoid locating near foliage and or standing water. Take another sample outside the isolation near the decontamination chamber entrance. Include 1 field blank in the sample set If the remediation has passed a visual inspection and the final inside air sampling indicates number and types of spores found equal to or less than the out-door sample the area can re-opened. Please note that 1 or 2 spores found inside the area and not outside do not necessarily reflect mold proliferation but are reflective of the normal variation found in natural spore distribution. If the inside area has a higher number of spores and or greater that three spores of a type not found outdoors then the area needs to be re-inspected, re-cleaned and re-sampled. 17
18 APPENDIX E WATER REMEDIATION FIELD FORMS AND EQUIPMENT LIST 18
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