Environmental health assessment report, 1 Liberty Plaza, Oct 2001

NYC 9/11 Public Portal Document

BROOKFIELD Fax:212-417-7194 Oct 22 2001 13:25 P.05 Sent aY: Hilimann Environmental; 908 688 2838; Oct•22.01 1:00PM; Page 5/9

t ltfl~ld l+ uisl PrepeRiw Pro)eet No.; Y13350 October 22, 2001 N3.7466

saisidcd since the building f3VAC became operational, the windows were replaced and the burning of debris has decreased.

Al Brootcttol4's cleaning aotivit ee were completed on each floor over the last three were each wOake, the 54 floors were teaed for airborne asbestos. Five samples method run on 7400. floor and analyzed using Contrast Microscopy (PCM), NIOSH A' a quality auursncc mesure,one sample from r Ch floor was analyzed by Transmission Electron Micrccopy, EPA level U protocol, to assure the accuracy of the PCM analysis. Results of these samples wore lower than the New York City at+ttrrd for vocupancy of abated area (less than 0.01 fibers per cc). i ? 2.5 E4vtronmeetal health Risk; Aueumeet I Wcn the building HVAC sy~stcm was made fully operational and was activated, we bean the Environmental Health Risk Assessment for the occupancy of the building. This testing was performed under normal occupancy conditions and represents the environment that the tenant may expect to encounter upon returning to One Liberty Plaza.

Aj part of Hirimann's health risk Lsment, visual inspections were conducted on floor tls ughout the +wilding. This included idantlf,i g noticeable odors, wnlasual staining and/or d' ` loration of building materials or furniture, water ulrajrwgclintmslon and dusty scolored vents. In addition, mechanical equipment tomes (MERs) were inspected to assess the cleanliness of the HVAC machinery, the quality of the building's potable weer system and chemicals stored on site.

in:' addition to the air and bulk sampling collected during the building restoration process, Hillmann conducted lair clearance sampling for each floor to detcmtine If the a can be determined a "occupy able'. Sampling occurred when the HVAC a was Mly operational. Three locations on each floor were monitored for teipperatuxe, relative humidit carbon dioxide, carbon monoxide and respirable dust. T total volatile organic carnpounds (TVOC), one microbial spore trap, one silica dust and one metal fumes in a' it samples were also collected per floor. On October 16, 2001, two TVOC, cue microbial spore trap, ore silica dust and one motels fumes in sir samples were collected on Floors 37 thru 54. On October 17. 2001. two TVOC, o* microbial spore trap, onp silica dust and one metals fumes in air samples were collected on Floors 14 thru 36. On October 18, 2001, two TVOC, one microbial spore trap, one silica dust and one metals fumes in air samples were collected on the Sub- Concourse Level thru Floor 3, On October 19, 2001, temperature, relative humidity, carbon dioxtdc, carbon monoxide and respirable dust samples were colleted out all floors throughout the building. Asbestos in air samples were colleted in five iodations per floor as part at the final clearance sampling. Air sampling results are summarized below in Table 2.6.

T*o samples were hand to !contain pester than 1.7 rag/M'. Both arc likely to have caused by the presence of cleaning products (polishing sprays, carpet cleaners,

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NYC-WTC 000124235