Law Department notice on WTC document preservation, Oct 2001

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o WTC Indoor Air/Environments Monitoring - Sampling and Analytical Procedures for Background and Cleaning Studies o io co

TJ I Parameters c o CT o o o' This is a micro vacuuming methcxL Three co-located samples will be collected fiom ■0 cn Settled Dust Carpets, fabric furniture or Asbestos ASTM 05755-95 ASTMD 5755-95 o each location. o Porous Soft drapery in areas of activity 3. cn <o Surfaces (living rooms, family rooms) This is a micro vacuuming method. Three co-located samples will be collected fiom Lead ASTME1973-99 SW-846 60108 O each location. o o c Asbestos ASTMD 6480-99 Wipe Samples ASTM D 6480-99 (wipe) 3 CD I-ead HUD Appendix 13.1 Wipe Samples SW-846 6010B O

Settled Dust Horizontal surfaces of tables or Dioxins ASTMD 6661-01 Wipe Samples ASTM 6661-01/SW-846 8290 Non-porons counters and bate floors, ceiling PAHs ASTMD 6661-01 Wipe Samples ASTM 6661-01/SW-846 8270C Hard and walls in areas of activity Surfaces (living rooms, family rooms) Total Dust HUD Appendix 13.1»* Wipe Sample collected at one location per unit. No Formal Method (NIOSH 7500 Modified) Silica, calcite, HUDAwJoidix 13.1*» Wipe Samples. All parameters will be collected on one wipe. NIOSH 7500 (XRD) gypsum MMVF ASTMD 6480-99 Samples will be combined with the asbestos sampling. EMSLMSD.0300 Air pomp operated at lOL/min for 8 hours to achieve the COPC wkgroup Practical PCM NIOSH 7400 followed by TEM AHERA Asbestos NIOSH 7400 Quantitation Limit (PQL) method.

Lead NIOSH 7300 Air pump operated at 1 OLZmin for 8 hours to achieve the COPC wkgronp PQL SW-846 60108

Air pump operated at 2L/min for 8 hours. Pilot Clean-up study only for worst case SW-846 8270 (Analytical method will be PAHs NIOSH 5515 scenarios. modified to achieve the COPC wkgroup PQL Areas of known activity (living Indoor Air rooms, family rooms) Air pump operated at 2SL/min for 35 hours. This modification is not a proven Dioxins TO-9 (Modified for indoor air) method. To be conducted during the Pitot Clean-up study only for worst case SW-846 8290 scenarios. Silica, calcite, NIOSH 7500 Air pump operated at 2.5L/min for 8 hours to achieve the COPC wkgroup PQL NIOSH 7500 (XRD) gypsum

MMVF NIOSH 7400 Samples will be combined with the asbestos sampling. EMSLMSD.0300

Bulk samples will be collected fiom HVAC or AC window type unit filters, shaken PLM NYS 198.1 followed by Asbestos Bulk Sample into a plastic bag and transferred into the sample container. TEM NYS 198.4

Lead (If the volume required is not sufficient for all analyses, the sample will be analyzed Bulk Sample SW-846 6010B for asbestos only. HVAC systems and AC units PAHs (If the volume required is not sufficient for all analyses, the sample will be analyzed (collection of bulk dust sample Bulk Sample SW-846 8270 Bulk Dust for asbestos only. from the unit air filtas). Background study only. Dioxins Of the volume required is not sufficient for all analyses, the sample will be analyzed Bulk Sample SW-846 8290 for asbestos only. Silica, calcite, (If the volume required is not sufficient for all analyses, the sample will be analyzed Bulk Sample NIOSH 7500 (XRD) gypsum for asbestos only. MMVF (If the volume required is not sufficient for all analyses, the sample will be analyzed Bulk Sample PLM NYS 198.1/EMSL MSD.0300 for asbestos only.

NOTE: Wipe samples for silica, calcite and gypsum will be collected using the HUD Appendix 13.1 method since no standardized method is available.