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Residential sampling protocol, World Trade Center, Oct 2001

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Sampling protocol developed to assess residential exposure to airborne and settled dust near the World Trade Center.

NYC-WTC_000178091–000178127
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NYC 9/11 Public Portal Document

[Mcresidentiafplan^^

****DRAFT^*** I 5 1. General public indudes adults and children not directly involved in emergency response and recoveiy activities. 2. Documents and information that were considered in setting the action level. 3. Background !e\’elsfQrNYC are being

determined. 4. PCM equivalents (PCMe) is determined using TEM analysis and counting fibers > 0.3 gm in diameterand > 5 pm in length. PCMe should be determined usir^ consistent methods to provide comparable concentrations. If

PCM is exceeded, may need to determine PCMe using TEM. Use professional judgement to determine if PCMe is needed by evaluating the frequency and magnitude of exceedance, size of geographic area involved, and trends in data.

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NYC-WTC_000178117

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NYC-WTC_000178117Source: NYC Law Department, mirrored locally

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