Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

I wtc residential plan octlS.wpd Page 28 (

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Attachment I 1

FINAL (October 11. 2001) ATSDR, CDC, EPA, OSHA Environmental Assessment Workgroup Asbestos Action Levels for World Trade Center Response ======^^===£±==:=3=:s==zs==s=^^

Action Level & Analysis Method General Public/Recommendations' Supporting Information^ Comntenls

NYC Background’ PCM/PCMe* f/cc • No restriction on access to ary area. AHERA standards (40 CFR • Ronediation goal is to achieve background levels.

(see footnotes 2 and 3) 763); ATSDR Toxicological • AHERA guidance for schools requires that when schools are remediated for

Profile for Asbestos; OSHA asbestos, the indoor air levels of asbestos should be similar to local outdoor air

29 CFR 1926.1101 levels.

• Lowest attainable cancer risk

NYC Background to 0.01 f7cc PCM/PCMe’ • No restriction on access to streets and public/ AHERA standards (40 CFR ■ No significant cancer risk for short-term occupancy for residential and school

commercial building; continue to monilor 763); ATSDR Toxicological buildings. J

■ Evaluate to determine if long-term access is acceptable; Profile for Asbestos; IRIS; • AHERA guidance for schools requires that when schools are remediated for

evaluate trends over months. OSHA 29 CFR 1926.1101 asbestos, the indoor air levels of asbestos should be similar to local outdoor air I a Identify souree levels

■ Take action, as practical, to reduce levels to background

70 siructures^nm’ TEM • If < than 70s/mm*, norestnetionson access to buildings AHERA standards (40 CFR • AHERA standards ap|dy only to sdtods, and hj' NYC ordinance to b"ilding3.

• If > 70 s/mm\ resample to confirm and analyze field blanks; 763) • Melltod sensitivity and counting rules should follow Appendix A (Table l)in

take action to identify source and reduce levels to < 70 a/mm’ NYC Clearance stiuidard for AHERA 40 cm 763; Mcthtxl sensitivity based on # giids analyzed mid air I buildings I sample volume and must be maintained al 0.005 Fee.

0.01 -0.1 f/cc PCM/PCMe’ • Continue to monitor, consider the need for additional Lowest limit set at 1/10 • Long-term exposures may increase cancer risk in the general public. I sampling sites. PEITREL/TLV; AHERA • Unlike workers the general population, includes children and sensitive persons.

• If air levels oiu consistently betwven 0.01 to 0.1 Fee, standards (40 CIK 763); d(>es not receive e.xposiire monitoring tuul does not ptulicipate in annual Iteallh evaluate the need for advisories, the need to limit ATSDR To.xicological Profile screening i access and the need fa* dust suppression.. for Asbestos; IRIS;

OSHA 29 CFR 1926.1101;

>0.1 f/cc PCM/PCMe’ • Evaliuitc the need to restrict general pildic access. Unacceptable cancer risk General public should nrt be exj)ose<l Io levels suspected of adverse health effects • Continue to monitor, consider Ilie need Rm- additional following lodg-tenn e.xposiu e; upcMJ long-lam e.xjx»3uie. sampling sites.. AHERA standards (40 CFR

763); ATSDR Toxicological n Profile for Asbestos; IRIS; H I OSHA 29 CFR 1926.1101 LO

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