NYC-WTC_000209427

NYC 9/11 Public Portal Document

Even if Region 1 did not want to use this publi shed data on typical dust levels, it had it own data, developed during the testing of the Brookfield schools, that showed that clean surfaces and clean schools had much, much lower background dust levels.

Re*calculation of Region 1 dust benchmark with more appropriate values

Table 4 gives re-calculated values for dust benchmarks using more appropriate, accurate, and defensible values for ambient background air emd K-factors. A range of different calculations is given, showing tae effect of substituting several different values. In all cases, the result is a much lower dust benchmark than the one contrived by Region 1.

Brookfield School System and community rejection of EPA Region 1 benchmark of 45,000 s/cm^ for dust

The Brookfield School System in Connecticut and the community has rejected EPA Region I's benchmark for dust of 45,000 s/cm^ as not being well founded or protective. It has been tentatively decidi^d that a level of 5000 s/cm^ is the cleanup goal.” Because data clearly demonstrate that a cleaned surface, even in an asbestos-contaminated building, will only have 86 to 320 s/cnr asbestos (see Table 2) there is no reason why the cleanup standard should not be much lower.

As a brief history of the problem, recently teachers at the Huckleberry Hill elementary school in Brookfield, Connecticut were concerned with an asbestos abatement in the year 2000 where the Region 1 benchmark of 45,000 s/cm^ was the standard. The teachers hired an independent industrial hygienist. Side-by-side testing was performed with the school system’s testing consultant. High, levels of asbestos were found by the ASTM 5755 microvacuum method in two carpets (over 462,240 and 329,560 s/cm^) as well as on top of a fire alarm box (over 3 million s/cm^) and on bare floors in another corridor (around 150,000 s/cm^).^’

The students were to be transferred to a middle; school to finish the year, but this school was tested and also found to have high asbestos dust levels, and failed the AHERA air test. At another school, asbestos was found in surface dusts at concentrations as high as 14 million s/cm\ The whole schoo l system was then shut down for the rest of the school year for further testing and inspection.^’

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