NYC 9/11 Public Portal Document
in the Millette and Hays study. All of the other Mil tte 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 resuspension factors, called the WTC-
Factors:
Table 2. Resuspension WTC-Factors for settled dusts fr, ,,n World TradeCenter using actual
measureme, is for passive conditions and modifications to K-Factors found in Milette and Hays
study
SETTLED C 'ST AIR LEVEL WTC-FACTORS
LEVEL (s/mL) Multiply the settled dust level by
A L (s/cm2) this number to predict air levels
HIGH EXPOSURE BUILDING, 250 South End Ave. Heavy visible dust layer, could stil read
addresses
on envelopes on table and see the Ines 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, b40,000 2.56 4 x 10-6 (measured)
found by testing (0.000004)
Carpet cleaning (ordinary 640,000 .5
24.96 3.9 x 10 (estimated)
vacuum) (0.000039)
Broom Sweeping 640,000 454.40 7.1 x 101 (estimated)
(0.00071)
Cleaning storage area 640,000 19.84 3.1 x 10'5 (estimated)
(0.000031)
Gym-Athletic Activities 640,000 153.60 2.4 x 10'4 (estimated)
(0.00024)
\4 Cable Pull 640,000 89.60 1.4 x 10-4
(0.00014 )
(estimated)
o ~c -OWEÔ UILDINGG , 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 iving room table, lying room
measured under passive conditions
air level
Passive corditions, found 29,000 0.12 4 x 10-6 (measured)
k 4 by testing
Carpet cleaning (ordinary 29,000 1.13
(0.000004)
3.9 x 10'5 (estimated)
vacuum) (0.000039)
Broom Sweepi.-ig 29,000 20.59 7.1 x 10-4 (estimated)
(0.00"I )
Cleaning storage area 29,000 0.90 3.1 x 10-5 (estimated)
(0.000031 )
Gym-Athletic Activities 29,000 6.96 2.4 x 10-4 (estimated)
( 0.00024
Cable Pull 29,000 4.06 1.4 x 10-4 (estimated)
(7 kre,er' s___ ( 0.00014
NYC-WTC 000125977
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