ATSDR/DHAC_ASTM

Z Z o --- ----- o io DRAFT (September 20,2001,11 a.m.) EPA, DOL, and DHHS Environmental Assessment Workgroup Asbestos Action Levels for World Trade Center Response co

I Action Level (f/cc) & Analysis Method General Public/Recommendations' Basis Comments ■D o c o CT o NYC Background^ PCM/PCMe’ • No restriction on access to any area. Lowest attainable cancer risk • Remediation goal is to achieve background o' co levels. ■D CJ> o CD • Considered AHERA guidance for schools 3. 03 O which requires that indoor air levels for schools, remediated for asbestos, should be o o similar to local outdoor air levels for schools. o — c 3 NYC Background to 0.01 PCM/PCMe • No restriction on access to streets and AHERA standards (40 CFR 763) No significant cancer risk for short-term (less CD O public/commercial building. than 6 months) occupancy for residential and • Interim access, no longer than 6 months, approved for school buildings. residences and schools: ■ Resample to confirm levels and identify source ■ Take action to reduce levels to background

0.01 - O.I PCMMPCMe • Limit access to a few hours for the general public. Lowest limit set at 1/10 • Long-term exposures (longer than 8 • Continue to collect both ambient and indoor air PEL/REL/TLV hrs/day) may increase cancer risk in the samples. general public. • Unlike workers the general population includes: children and sensitive persons, does not receive exposure monitoring, and does not participate in annual health screening

> 0.1 PCM/PCMe • Restrict general public access. Unacceptable cancer risk General public should not be exposed to • Continue to collect both ambient and indoor air levels suspected of adverse health effects. samples.

Action levels (C^cc) for workers involved in emergency Disaster Response and Recovery Workers Basis Comments response and recovery activities (follow applicable OSHA standards)

0.1 PCM only • Respiratory protection required for workers, based on PEL Value, 0.1 fZcc based on an eight hour time an 8 hour time weighted average (TWA) of exposure of weighted average, is the Occupational Safety 0.1 PCM. Longer shift work, i.e., lower levels of and Health Administration’s (OSHA) exposure (i.e., the proportional maximum exposure for a Permissible Exposure Limit for asbestos, as 12 hour shift is 0.07 fZcc PCM). specified in the OSHA Construction Industry Regulation for Asbestos, 29 CFR 1926.1101.

1.0 PCM only • The maximum allowable level for workers average STEL Value, 1.0 ftcc measured over a 30-minute over 30 minute period (OSHA short term exposure period, is the Occupational Safety and Health level). Administration’s (OSHA) Short-Term Exposure Limit for asbestos, as specified in the OSHA Construction Industry Regulation for Asbestos, 29 CFR 1926.1101. = 1. General public includes adults and children not directly involved in emergency response and recovery activities. 2. Background levels for NYC being determined. 3. PCM equivalents (PCMe) should be determined using consistent methods to provide comparable concentrations.