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Pre -Construction Building Materlal/Fumishlna Formaldehvde Emissions Assessment <br />This formaldehyde emissions assessment should be used in the environmental review under <br />CEQA to assess the indoor formaldehyde concentrations from the proposed loading of <br />building materials/furnishings, the area -specific formaldehyde emission rate data for <br />building materials/furnishings, and the design minimum outdoor air ventilation rates. This <br />assessment allows the applicant (and the City) to determine, before the conclusion of the <br />environmental review process and the building materials/furnishings are specified, <br />purchased, and installed, if the total chemical emissions will exceed cancer and non -cancer <br />guidelines, and if so, allow for changes in the selection of specific material/furnishings <br />and/or the design minimum outdoor air ventilations rates such that cancer and non -cancer <br />guidelines are not exceeded. <br />1.) Define Indoor Air Quality Zones. Divide the building into separate indoor air quality <br />zones, (IAQ Zones). IAQ Zones are defined as areas of well -mixed air. Thus, each <br />ventilation system with recirculating air is considered a single zone, and each room or <br />group of rooms where air is not recirculated (e.g. 100% outdoor air) is considered a separate <br />zone. For IAQ Zones with the same construction material/fumishings and design minimum <br />outdoor air ventilation rates. (e.g. hotel rooms, apartments, condominiums, etc.) the <br />formaldehyde emission rates need only be assessed for a single IAQ Zone of that type. <br />2.) Calculate Materlal/Fumishlna Loading. For each IAQ Zone, determine the building <br />material and furnishing loadings (e.g., m2 of materiaUm2 floor area, units of furnishings/m2 <br />floor area) from an inventory of all potential indoor formaldehyde sources, including <br />flooring, ceiling tiles, furnishings, finishes, insulation, sealants, adhesives, and any <br />products constructed with composite wood products containing urea -formaldehyde resins <br />(e.g., plywood, medium density fiberboard, particleboard). <br />3.) Calculate the Formaldehyde Emission Rate. For each building material, calculate the <br />formaldehyde emission rate (µg/h) from the product of the area -specific formaldehyde <br />emission rate (µg/m2-h) and the area (m) of material in the IAQ Zone, and from each <br />furnishing (e.g. chairs, desks, etc.) from the unit -specific formaldehyde emission rate <br />(µg/unit-h) and the number of units in the IAQ Zone. <br />79v141 <br />