Letter enclosing air monitoring report, 75 Maiden Lane, Mar 2002

NYC 9/11 Public Portal Document 03/02/2002 16:52 2122691585 MEDIA TECH CENTERS PAGE 03 2125450757 ADVANCED ENVIRONMENT PAGE 03 ' 03/0612002 08:03

Recovery Physical Therapy Metals Ak Moattorh>ig for Asbestos, Respirable Dust, and Priority pollutant Ba*eu*ntThrapy Room, 79 Malden Lane New York NY A an-dranmunea!

during sample a•: i4 accords with the sampling protocol 4,.Q ll an 1 mm pylori cyclone was utilized '$ble..dust from tculate matter of 10 micron: collection. The concept of the cyclone is to serpat.te . draws in the air acid .X0.:1;7. Lam; d cyclone inlet pore size or greater. With the aiz flvvi+ rate htetr. ones. The ayalone's: separates1 <'e, r• -+ratan a spiral notion or vortex, which ,:* . particles &.off the li microns) are drawn up and t pot accepts the heavier particles while *le Hi it piiztlolea (lea than .10 ittipacted onto the filter cassette:

The sample data is preaexrted' as a ration of Pai i v@sired'bY weight)1 volume of air collected: concentration of 0.0173 mg/rn Lwhich is 11ne sample results indicated a Total Respirable Fruit (orP1'OC) mg/m3. These results can be found in well below the OSHA Permissible Pxposure Limit (PBL) of 5 Appendix B. metals pollutant metals in the ambient air. One (1) Sampling was performed to determine levels of priority Mchods 1987 200.7 and 245.1 for priority pollutant sample was collected and analyzed according to EPA mixed cellulose ester filter using a 37 metals analysis. The sample was collected on a 0, tnt pore size used to draw air through the filter media. millimeter cassette. A low flow volume personal air pump woes M-30, before and after sampling to ensure now rates were measured with a Mini Buck calibrator model face in accordance with the sampling an accurate volumetric reading. The sample was collected closed protocol. Arsenic, Beryllium, Cadmium, Chromium, The priority pollutant metals tested include Antinomy, and Zino. The sample results detects no Copper, Lead, Mercury, Nickel, Selonlum, Silvee', Thallium, exception of chromium. The sample result airborne concentrations of priority pollutant metals with the well below the OSHA Permissible indicated a total chromium coaoetoation of 0.619 µg/tz?' which is Exposure Limit (PEL) of 500 µg water soluble chromium (II1) compounds per cubic meter of workplace rd and luble r compounds, and 52 air (300 µg/m'), 1,000 40- work wee µg/m for chromium (vi) campfor for 8 roux shi ddd so

These results can be found in Appendix C.

Summary and priority pollutant metals, In conclusion, sample data obtained for asbestos, respirable fraction dusts, have any questions or need are well below applicable exposure standards for these substances- If you further clarification on air sampling methodology, Please call me.

Sincerely,

Edward Nen th Principal 1213.001 ~t~ygoprverl lmatai '~IEmL9 a~aweYRh9~io►1174 Aden ac e+ti'PLdm

347 FIf h Avenue. Suite 404, New fork, New York 10016 Phone 212-545-1855 Fax 212-545-0757

NYC-WTC 000097317