Add Contractor Letters of Assurance as required documentation.

Remove: "Rack space and fan capacity is in place for future carbon filters or combination particle/carbon filters." Add: "Rack space is available and rack location identified for future implementation of carbon filters or combination particle/carbon filters."

Projects unable to provide additional space for carbon filters may instead educate future tenants on their ability to buy and install stand-alone air purifiers with carbon filters. The project team must provide a letter signed by the project owner to confirm that if required for WELL certification in the future, the project owner will buy and install the air purifiers with filters on behalf of the tenant. It must be demonstrated that adequate wall space is accommodated to install wall-mounted air purifiers. The WELL Assessor will confirm the available wall space and examine a copy of all the information given to tenants during the project’s Performance Verification.

Change Part 1b from "The system is able to accommodate additional filters" to "The mechanical system is sized to accommodate the additional filters."

Multifamily Residential projects may use wall-mounted HEPA filters to meet the requirements of Feature 5 Parts 1 and 2, provided the project contains a sufficient quantity of wall mounted HEPA filters in accordance with the manufacturer’s recommended area coverage. In addition, a policy document must be provided confirming Part 3 of the Feature and that the Owner will maintain the filters for the units that are located in both common and private areas.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To reduce mold and bacteria growth within buildings, particularly from water damage or condensation on cooling coils.'

Add: "occurring within one year prior to Performance Verification" after "building construction"

Add: "occurring within one year prior to Performance Verification" after "building construction"

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To minimize the introduction of construction-related pollutants into indoor air and protect building products from degradation.'

In Part 3a, change “A secure area is designated to store and protect…” to “A separate area is designated to store and protect…”.

In 24 Oct, 2016 AAP, remove: "Where the options of an entry vestibule or revolving door are not possible for projects with regularly occupied lobbies, projects". Add: "Projects"

In 24 Oct, 2016 AAP, remove: ""Projects must also provide indoor pressure sensor readings from one day. This should include exhaust and supply sequences. Projects should also provide mechanical drawings of the project space and manufacturer documentation of the air curtain equipment"". Add: ""To document this alternative adherence path, the project team must provide the following in the Documentation Submission:

- Indoor pressure sensor readings in accordance with ANSI/ AMCA 220 including exhaust and supply sequences from a single day
- Mechanical drawings of the project space and manufacturer documentation of the air curtain equipment""

Remove: "Permanent" from title of Part name.

For Part 1b, add: "(sum of indoor and outdoor length)" after "primary direction of travel"

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To minimize the introduction of pollutants into indoor air at building entrances.'

Projects may use a permanent entryway system 3 meters long, and an air curtain to create an air seal. There are several specifications for this path:

1. The air curtain must have a minimum velocity of not less than 2 meters per second (6.56 feet per second) at the floor, have been tested in accordance with ANSI/AMCA 220, and must be installed in accordance with manufacturer's instructions. It must also be commissioned prior to occupancy by a qualified agent.
2. An indoor pressure sensor must be installed in the building lobby that is capable of providing automatic readings at least once an hour.
3. The project team must specify target pressurization levels for these locations when the building is occupied. These levels have to keep air from entering the building more than the standard amount, allow occupants to open and close doors easily and not cause moisture problems due to exfiltration. Projects must provide documentation of these targeted levels and ensure they achieve the objectives outlines above.

To document this alternative adherence path, the project team must provide the following in the Documentation Submission:

• Indoor pressure sensor readings in accordance with ANSI/ AMCA 220 including exhaust and supply sequences from a single day
• Mechanical drawings of the project space and manufacturer documentation of the air curtain equipment

The requirements of Part 2 (Entryway Seal) may be met by controlling building pressure according to the following requirements:

- An indoor pressure sensor must be installed in the building lobby and near any other entrance to the building from the outside. The pressure sensor must be capable of providing automatic readings on a frequency of at least one per hour.
- The project team must specify the targeted building pressurization levels for these locations for when the building is in both cooling mode and heating mode. The pressure levels must keep outside air from entering the building (more than standard practice), allow occupants to open and close doors easily, and must not cause undue condensation or other moisture problems due to exfiltration through the building envelope.

To document this alternative path, the project team must provide the following in the documentation application submission:
- A narrative describing the targeted building pressurization levels for both cooling mode and heating mode.
- A narrative (and other supporting documentation as necessary) demonstrating that the pressure levels keep outside air from entering the building (more than standard practice), allow occupants to open and close doors easily, and do not cause undue condensation or other moisture problems due to exfiltration through the building envelope.
- Indoor pressure readings demonstrating one day of pressure sensor readings from a cooling period, and one day of pressure sensor readings from a heating period. The exhaust and supply sequences must be provided to demonstrate that the desired pressure readings will be achieved.

The Global GreenTag Standard v4.0 and PhD Methodology are not accepted as alternatives for the requirements of Feature 09 Part 1 because the requirements of GreenTag do not match those of these WELL features.

Cradle to Cradle Gold and Platinum for Material Health have been accepted as an alternative for the requirements of Feature 09 Part 1. Note that products only need to receive a Cradle to Cradle Gold or Platinum achievement level in the Material Health category and are not required to achieve Gold or Platinum in all five quality categories in order to be considered acceptable alternatives for Feature 09 Part 1.

Vikings by Rotulo Ecologico ABNT is not approved as an acceptable alternative to the requirements of Feature 09 Part 1. Equivalencies are a comparison of different codes and regulations and are appropriate for projects that wish to propose an equivalent standard, code, or practice to meet the feature intent.

Remove: "A cleaning plan is created which includes following requirements". Add: "A cleaning plan is created that includes"

Remove: "b. A list of approved product seals with which all cleaning products must comply (See Table A4 in Appendix C)". Add: "b. A list of approved product seals with which all cleaning, disinfection and hand hygiene products must comply in accordance with the Cleaning, Disinfection and Hand Hygiene Product section in Table A4 in Appendix C."

Remove: "d. A cleaning schedule that specifies the extent and frequency that a surface is cleaned, sanitized, or disinfected in accordance with the Disinfection and Sanitization and Entryway Maintenance sections of Table A4 in Appendix C". Add: "d. A cleaning schedule that specifies the extent and frequency of cleaning, including the Entryway Maintenance section of Table A4 in Appendix C"

Projects registered as New and Existing Interiors that can demonstrate that aspects of the base building operation is outside of their control are not required to achieve Feature 09, Part 1: Cleaning Plan for Occupied Spaces.

Add Part 1e with the following text: 'The Cleaning Equipment and Program Protocol section of Table A4 in Appendix C.'

GECA and SCS have been approved as acceptable alternatives for F09, Part 1, Requirement d.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To reduce occupant exposure to pathogens, allergens, and harmful cleaning chemicals.'

For Part 1b, add “and entryway walk off mats (if applicable)” after “each high-touch and low-touch surface” in the first sentence.

The European Standard PbEG L 230 and PbEG L 123 have been accepted as an alternative for the requirements of Feature 10 Part 1b.

For Part 1b, remove: "hazard-ranked". Add: "with a Hazard Tier ranking of 3 (least hazardous)" after "Use of pesticides"

Biopesticides registered with the Central Insecticides Board and Registration Committee (CIBRC) of India have been accepted as an alternative for the requirements of Feature 10 Part 1b.

Remove: "Only pesticides with a hazard tier ranking of 3 (least hazardous) as per the City of San Francisco Department of the Environment's (SFE) Hazard Tier Review Process are used. Refer to Table A2 in Appendix C for more details". Add: "Use of hazard-ranked pesticides based on screening lists described in Table A2 in Appendix C."

Remove: "Pestcide and herbicide use is minimized by creating a use plan based on Chapter 3 of the San Francisco Environment Code Integrated Pest Management (IPM) program". Add: "The creation of a pest management plan in place of pesticide/herbicide use, based on Chapter 3 of the San Francisco Environment Code Integrated Pest Management (IPM) program"

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To reduce the presence of pests in buildings and minimizing occupant exposure to harmful chemicals.'

In Part 1 description, change “The following conditions are met for all pesticides and herbicides used on plants:” to “The following conditions are met for all pesticides and herbicides user on outdoor plants.”

Projects may meet Feature 11 Part 1 by complying with requirements for maximum concentration values for toxic chemicals tolerated by weight in homogenous materials as required by European Union’s Restriction of the Use of Certain Hazardous Substances (RoHS).

EPA Ireland - Management Plan for Polychlorinated Biphenyls (PCBs) in Ireland has been accepted as an alternative for the requirements of Feature 11, Part 4 for projects in Ireland.

Products certified under Global GreenTag Standard v4.0 and PhD Methodology are considered to meet the asbestos and mercury restrictions of Feature 11 Part 1c and 5b.

Asbestos Content and Advocacy
All newly-installed building materials do not contain asbestos >1% by weight in the below materials. Wherever procurement of a product or a material not possible, the project is permitted to submit documentation demonstrating an attempt has been made, including a petition or formal request filed with at minimum 3 manufacturers (per product or material) who were unable to meet their needs.

1. Thermal insulation (applied to pipes, fittings, boilers, breeching, tanks, or ducts)
2. Acoustical plaster
3. Fireproofing materials on structural members
4. Wallboard/millboard
5. Floor tile and sheeting
6. Roofing and siding shingles (including metal cladding)
7. Construction mastics

Lead Content
All newly-installed building materials meet the following material composition requirements:

1. No more than a weighted average of 0.25% lead in wetted surfaces of pipes, pipe fittings, plumbing fittings, and fixtures, and 0.20% for solder or flux used in plumbing for water intended for human consumption.
2. No interior or exterior paints containing lead.
3. Use of lead-free roofing and flashing.

Lead Advocacy
For each product type listed below (as applicable) projects submit documentation demonstrating a petition or a formal request is filed with at least three manufacturers to limit lead content to <100ppm.

1. Door hardware
2. Ductwork
3. Conduit
4. Metal studs
5. Mirrors
6. Brass cooler drains, pumps, motors, valves
7. Vinyl blinds or wallcovering

Lead Disclosure
Project teams file a petition with an agency focused on protecting the public from risk or injury associated with consumer products, requesting a product label is developed for building products to verify lead content is below 100ppm.

Directive 2009/95/EC of the European Parliament and of the Council of 27 January 2003 has been accepted as an alternative for the requirements of Feature 11, Parts 5a and 5b, for Europe. Note that high-pressure sodium lamps must still meet the LEED v4 requirements.

OSHA 29 CFR 1926.62 has not been deemed equivalent to EPA 40 CFR Part 745.227 for the requirements of Feature 11, Part 2. Note while the acceptable work practices are similar between the two standards, OSHA 29 CFR 1926.62 does not establish determinations for all lead-related hazards to an occupant beyond the potential exposure of a construction employee.

Complex electrical or data products that are made up entirely of small electrical components, such as fire alarms, meters, sensors, thermostats and load break switches, may meet the European Union’s Restriction of the Use of Certain Hazardous Substances (RoHS) Directive in lieu of the 100 ppm limit on added lead in Feature 11 Part 1c. RoHS establishes the following maximum concentration values for chemicals by weight in homogeneous materials:
1. Lead (Pb): < 1000 ppm
2. Mercury (Hg): < 100 ppm
3. Cadmium (Cd): < 100 ppm
4. Hexavalent Chromium (Cr VI): < 1000 ppm
5. Polybrominated Biphenyls (PBB): < 1000 ppm
6. Polybrominated Diphenyl Ethers (PBDE): < 1000 ppm
7. Bis(2-Ethylhexyl) phthalate (DEHP): < 1000 ppm
8. Benzyl butyl phthalate (BBP): < 1000 ppm
9. Dibutyl phthalate (DBP): < 1000 ppm
10. Disobutyl phthalate (DIBP): < 1000 ppm

Add: "and Policy Document" after "Remediation Report"

In feature background, remove: "(Please refer to Table A3 for additional details.)"

In part description, remove: "on buildings". Add: "of projects"

For Part 5b, remove: "Project develops a plan to upgrade current mercury-containing lamp". Add: _“Project does not install any lamps not compliant with the low-mercury limits specified in Appendix C, Table A5. Project develops a plan to upgrade any existing non-compliant lamps to low-mercury or mercury-free lamps.”