Legal hold notice for WTC documents, undated

WTC Indoor Air Monitoring - Sampling and Analytical Procedures Media Analytical Sampling Points Sampling Method Proposed Sampling Vulnerability/Practicality Analytical Method Proposed Parameters "This test method does not describe procedures or techniques ? to usae,G required to evaluate the safety or habitability of buildings with Asbestos Microvac ASTM 5755-95 asbestos-containing materials, or compliance with federal, state, or ASTM 5755-95 ro v e of NYC-WTC_000148608

Mic c local regulations or statutes. It is the user's responsibility to make sen s these determinations." (Section 5.1.1 of method 5755-95) collection method eficing Pre besto is Not Know - As Lead Microvac ASTM 5755-95 ** NIOSH 7300 Carpets. fabric furniture or Porous Soft NYC 9/11 Public Portal Document

drapery in areas of activity Still checking on methods. Reached After speaking with several people in HQ and RTP, it does not surfaces appear there are standardized methods for the collection of these To be determined once the sampling method (if (living rooms, family rooms) Dioxins out to RTP and HQ. Waiting for parameters, rather many of the methods being used today are any) has be selected additional information research and development procedures. Detect/Nondetet PAHs # # * Silica

MMVF Microvac ASTM 5755-95 See the comment for asbestos. Samples will be combined with the EMSL MSD.0300 asbestos sampling.

"This test method does not describe procedures or techniques required to evaluate the safety or habitability of buildings with Wipe ASTM D 6480-99 or ASTM D 6480-99 (wipe) or Asbestos asbestos-containing materials, or compliance with federal, state, or Microvac ASTM 5755-95 ASTM 5755-95 (microvac) local regulations or statutes. It is the user's responsibility to make these determinations." (Section 5.1.1 of method 5755-95) Horizontal surfaces of Non-porous tables or counters and Lead NIOSH 9100 None known, wipe sampling has been legally defended. SW-846 6010B Hard barefloors, ceilings and * surfaces walls in areas of activity Dioxins ASTM D 6661-01 ASTM 6661-01/SW-846 8290 (living rooms, family rooms) PAHs ASTM D 6661-01 ASTM 6661-01/SW-846 8270C

Silica See comment for silica above. See comment for silica above. See comment for silica above.

Wipe ASTM D 6480-99 or Same as asbestos microvac. Samples will be combined with the EMSL MSD.0300 MMVF Microvac ASTM 5755-95 asbestos sampling. Air pump operated at 10L/min for 8 hours to achieve the PIC PCM NIOSH 7400 followed by TEM AHERA Asbestos NIOSH 7400 wkgroup detection limits method.

NIOSH 7300 Air pump operated at 10L/min for 8 hours to achieve the PIC SW-846 6010B Lead Areas of known activity wkgroup detection limits Indoor Air (living rooms, family rooms) Air pump operated at 2.5L/min for 8 hours to achieve the PIC Silica NIOSH 7500 NIOSH 7500 (XRD) wkgroup detection limits Assumed that it behaves the same as asbestos, samples will be EMSL MSD.0300 MMVF NIOSH 7400 combined with the asbestos sampling.

NOTE: All samples (cassettes and wipes) will be preweighed by the laboratory or supplier prior to sample collection. After sample collection and upon receipt of the samples by the laboratory, the laboratory will weigh the sample wipe or cassette prior to performing the analysis.

** This method is for asbestos and is being modified for the collection of lead dust. Modification - to use the filter specified for method NIOSH 7300