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11-26-18_AGENDA PACKET
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11-26-18_AGENDA PACKET
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4 <br />Phase 2 Formaldehyde ATCM materials, and are ventilated with the minimum code <br />required amounts of outdoor air, the indoor formaldehyde concentrations are likely similar <br />to those concentrations observed in residences built with CARB Phase 2 Formaldehyde <br />ATCM materials (Chan et. al., 2018), which is a median of 25 µg/m3. <br /> <br />For the occupants of these residential dwelling units, they will potentially have continuous <br />exposure (e.g. 24 hours per day, 52 weeks per year) and assuming inhalation of 20 m3 of <br />indoor air per day, the average 70-year lifetime formaldehyde daily dose is 500 µg/day. <br />This exposure represents a cancer risk of 125 per million, which is more than 12 times the <br />CEQA cancer risk of 10 per million. <br /> <br />Outdoor Air Ventilation Impact. Another important finding of the CNHS, was that the <br />outdoor air ventilation rates in the homes were very low. Outdoor air ventilation is a very <br />important factor influencing the indoor concentrations of air contaminants, as it is the <br />primary removal mechanism of all indoor air generated air contaminants. Lower outdoor air <br />exchange rates cause indoor generated air contaminants to accumulate to higher indoor air <br />concentrations. Many homeowners rarely open their windows or doors for ventilation as a <br />result of their concerns for security/safety, noise, dust, and odor concerns (Price, 2007). In <br />the CNHS field study, 32% of the homes did not use their windows during the 24‐hour Test <br />Day, and 15% of the homes did not use their windows during the entire preceding week. <br />Most of the homes with no window usage were homes in the winter field session. Thus, a <br />substantial percentage of homeowners never open their windows, especially in the winter <br />season. The median 24‐hour measurement was 0.26 ach, with a range of 0.09 ach to 5.3 ach. <br />A total of 67% of the homes had outdoor air exchange rates below the minimum California <br />Building Code (2001) requirement of 0.35 ach. Thus, the relatively tight envelope <br />construction, combined with the fact that many people never open their windows for <br />ventilation, results in homes with low outdoor air exchange rates and higher indoor air <br />contaminant concentrations. <br /> <br />The Magnolia at the Park project in Santa Ana is a multi-family residential project and is <br />located close to roads with high traffic (e.g. I-5 and SR-55), and as a result has been
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