EPA memorandum detailing plans for asbestos wipe sampling, projecting airborne dust levels, and estimating increased cancer risks from WTC dust exposure.
NYC-WTC_000151635–000151653Folder label: “WTC DC TO RC LETTERS CALLEHAN WHITMAN ETC. WARD DOCTOROFF KENNY”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
in the Millette and Hays study. All of the other Millette and Hays resuspensicn 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 resuspension factors, called the WTC- Factors:
Table 2 Resuspension WTC-Factors for settled dusts from World Trade'Center using actual measurements for passive condittons and modifications to K-Factors found in Miletteand Hays study
SETTLED DUST AIR LEVEL WTC-FACTORS LEVEL (sAnL) MultipV the setfiod dust level by (s/cm’) this number to predict air levels
HIGH EXPOSURE BUILDING, 250 South End Ave. Heavy visible dust layer. coUd stil 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 condifions, 640.000 2.56 4 X IO"* (measured) found by testing ( 0.000004 )
Carpet cleaning (ordinary 640,000 24.96 3.9x10® (esfimated) vacuum) (0.000039 )
Broom Sweeping 640,000 454.40 7.1 X 10^ (esfimated) (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 1.4x10"* (esfimated) (0.00014 )
LOW EXPOSURE BUILDING. 45 Warren St. dust layer visible on dark table, grain of wood still visible. S blocks from Ground Zero, building faced north. Dust level from Iving room table. Iving room air level measured under passive condtiorts
Passive condifions, found 29,000 0.12 4 x IO'® (measured) by testing ( 0.000004 ) « Carpet cleaning (ordinary 29,000 1.13 3.9 x 10 ® (esfimated) vacuum) ( 0.000039 )
Broom Sweeping 29,000 20.59 7.1 X 10"* (esfimated) (0.00071 )
Cleaning storage area 29,000 0.90 3.1 X 10® (esfimated) ( 0.000031 )
Gym-Athletic Activifies 29,000 6.96 2.4 X 10"* (estimated) ( 0.00024 )
Cable Pull 29,000 4.06 1.4 X (esfimated) (iff/onaef ( 0.00014 )
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NYC-WTC_000151640
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