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
Table A - ESTIMATING AIR LEVELS FROM ASBESTOS DUST LEVELS Uses asbestos risk assessment methodology of EPA Region 1 to calculate air levels from dust using the K-factors found by Willette, J. R„ and Hays, S. M. (1994) Chapter 8. Resuspension of Settled Dust. In: Settled Dust Sampling and Analysis, Lewis Publishers, CRC Press.
DUST LEVEL x K-factor = AIR LEVEL . where the K-factor increases with increasing human activities that stir up dusts (resuspension)
MEASURED K-factor = IO"® K-factor =10’’ K-factor =10' K-factor = 10^ DUST LEVEL activities where K-factor activities where K-factor no activities studied activities where K-factor measured included measured included gym- resulting in this K- measured included structures per vacuum cleaning carpet, athletic activities, broom factor warehouse with a fork lift square cleaning storage area sweeping, installing centimeter cable above ceiling tiles (s/cm^) multiply dust level by multiply dust level by multiply dust level by multiply dust level by 0.000001 to get 0.00001 to get 0.0001 to get 0.001 to get AIR LEVEL (s/mL) AIR LEVEL (S/mL) AIR LEVEL (s/mL) AIR LEVEL (s/mL) 100 0.0001 0.001 0.01 0.1 500 0.0005 0.005 0.05 0.5 1,000 0.001 0.01 0.1 1 2,000 0.002 0.02 0.2 2 3,000 0.003 0.03 0.3 3 4,000 0.004 0.04 0.4 4 5,000 0.005 0.05 575 5 6,000 0.006 0.06 0.6 6 7,000 0.007 0.07 577 7 8,000 O08 5758 0.8 8 9,000 0.009 0.09 575 § 10,000 0.01 571 i 10 20,000 O2 575 2 20 30,000 0.03 0.3 3 30 40,000 03 573 3 40 50,000 05 575 5 50 6o,oo0 0.06 575 5 60 yo'ooo o.o7 577 7 70 6o,ooo 5?35 575 5 SS 9o,OO0 0.09 375 5 53 1oo,oo0 3/i 1 T3 T33 200,000 O 5 53 533 300,000 O 5 53 333 400,000 o 3 33 333 S0o,o00 5?5 5 53 533 600,000 3?6 5 53 S33 700,000 377 7 73 733 SOoooo 375 5 53 533 90o,ooo 375 g 53 533 i,obo,ooo T T3 T33 1000 2,000,000 5 53 553 5333 3^00,000 5 53 533 3333 4,000,000 4 33 353 3333 5,000,000 5 53 553 5333 6,0oo,oo0 6 53 655 5333 7.O00.00O 7 73 755 7333 8.000,000 5 53 555 5333 9,000,000 5 53 555 5333 10,000,000 TB T3B T555 10000 so'Ooo'ood 53 533 5000 53333 loo.Ooo'ooo T53 lOOO 10000 10000O
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NYC-WTC_000140191
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