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Silica Personal Air Sampling Results for the WTC Residential Confirmation Cleaning Study
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(Analytical Method NIOSH 7500, Flow Rate 2.5 Umin, Required Volume 400 to 1,000 L)
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AS - The lowest reportable value Is equivalent to the Analytical Sensitivity which is calculated from the lowest reproducible concentration of silica detectable by the Instrument
N/A-Not Applicable
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000145032Source: NYC Law Department, mirrored locally
Document excerpt acknowledging contributors and outlining the collaborative scope of an EPA environmental protection study regarding the World Trade Center site.
EPA Region 2 letter regarding revised environmental work plan submission for two buildings including asbestos, health, and safety assessment components.