NYC 9/11 Public Portal Document
S. Findings and Conclusions
Twenty-one (2 I ) initial background air samples were collected and analyzed at building
200 Twenty-one
(21) were analyzed via phase contrast microscopy (PCM) and twelve
(12) were re -analyzed via
transmission electron microscopy (TEM). All were below the permissible limits.
{ Based on EPA Guidelines, we collected one hundred ninety-nine (199) bulk
samples and analyzed them via
Polarized Light Microscopy (PLM) Methodology. Sixteen ( 16) samples collected
from six (6) apartments
were found to be slightly above the regulatory limits of I%a. Of the
sixteen ( 16) bulk samples that were
found to be above the limits, zero (0) were found to be above the regulatory
limits upon further analysis at a
second laboratory for quality control purposes.
One hundred eighty-two ( 182) air samples were collected and
analyzed via TEM Methodology. The
results indicated that the livine areas achieved the acceptance criteria below
<70 structures per mm2
set by the above re.*uiations.
6. Limitations and Exclusions
All the professional opinions presented in this report are based solely on the
scope of work conducted and
sources referred to in our report" The data presented by ALC in this report was
collected and analyzed
using generally accepted industry methods and practices at the time the report was
generated. This report
represents the conditions, locations, and materials that were observed at the time the fi
eldwork was
conducted. No inferences regarding other conditions, locations, or materials, at a
later or earlier time may
be made based on the contents of the report. No other warranty express or limited
is made ALC 's liability
and that of its contractors and subcontractors, arising from any services
rendered hereunder. shall not
exceed the total fee paid by the client to ALC for this project. This report
was prepared for the sole use of
our client. The use of this report by anyone other than our client or ALC is
strictly prohibited without the
expressed written consent of ALC. Portions of this report may not be used
independent of the entire report
NYC-WTC 000117728
OCR can misread numbers and units. Confirm readings against the page image before using them.