EPA memorandum on wipe sampling methods for asbestos in Lower Manhattan buildings, resuspension projections, and cancer risk estimates from WTC dust exposure.
NYC-WTC_000140170–000140191Folder label: “EPA Cate Jenkins”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
in the Millette and Hays study. AU of the other Millette and Hays resuspension factors have also been increased by 10 for the WTC asbestos dusts. Table 2 provides the actual resuspension factor found by testing for WTC dusts under passive conditions, along with the predicted air levels under a variety of activities with the modified lesuspension factors, called the WTC- Factors:
Table 2. Resuspension WTC-Factors for setted dusts from World Trade Center using actual measurements for passive conditions and modifications to K-Factors found in Millette and Hays study
SETTLED DUST AIR LEVEL WTC-FACTORS LEVEL (s/mL) Multiply the settled dust level by (s/cm^) this number to predict air levels
HIGH EXPOSURE BUILDING, 250 South End Ave. Heavy visible dust layer, could stm read addresses on envelopes on table and see the lines on a yellow legal pad on the table. Windows had been blown out some places. Dust level from living room high boy side table, living room air level measured under passive conditions
Passive conditions, 640,000 2.56 4x 10’® (measured) found by testing ( 0.000004 ) Carpet cleaning (ordinary 640,000 24.96 3.9 X 10‘® (estimated) vacuum) ( 0.000039 ) Broom Sweeping 640,000 454.40 7.1 X 10“* (estimated) ( 0.00071 )
Cleaning storage area 640,000 19.84 3.1 X 10'® (estimated) ( 0.000031 ) Gym-Athletic Activities 640,000 153.60 2.4 X 10"^ (estimated) ( 0.00024 ) Cable Pull 640,000 89.60 1.4 X 10"^ (estimated) ( 0.00014 ) LOW EXPOSURE BUILDING, 45 Warren St., dust layer visible on dark table, grain of wood still visible. 5 blocks from Ground Zero, building faced north. Dust level from living room table, living room air level measured under passive conditions
Passive conditions, found 29,000 0.12 4x 10"® (measured) by testing ( 0.000004 )
Carpet cleaning (ordinary 29,000 1.13 3.9 X 10'® (estimated) vacuum) ( 0.000039 )
Broom Sweeping 29,000 20.59 7.1 X IO'* (estimated) ( 0.00071 )
Cleaning storage area 29,000 0.90 3.1 X 10'® (estimated) ( 0.000031 )
Gym-Athletic Activities 29,000 6.96 2.4 X 10"* (estimated) ( 0.00024 )
Cable Pull 29,000 4.06 1.4 X (estimated) ( 0.00014 )
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NYC-WTC_000140175
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NYC-WTC_000140259
Memorandum detailing procedures for asbestos wipe sampling in Lower Manhattan and estimating associated cancer risks from dust exposure.
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Technical memorandum from EPA discussing ultrasonication testing for asbestos in carpets and HEPA vacuuming effectiveness.
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EPA memorandum detailing plans for asbestos wipe sampling, projecting airborne dust levels, and estimating increased cancer risks from WTC dust exposure.
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Correspondence criticizing the EPA and DEP regarding asbestos, silica levels, and safety clearance after cleaning at 114 Liberty Street.
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