Chain of custody form, 100 Wall Street, Sep 2001

NYC 9/11 Public Portal Document

05/02!•02 THU 13:02 FAX 212 657 8333 CITIBANKJCRS l2012 • act=o3'-2001 10:ICam From- T-515 P. u=/u06 F-770

VIA FACSIMILE HfLI.MANN ENVIRONMENTAL GROUP,LL.0 ENVIRONMENTAL CONSULTING & LAS SERVICES October 2, 2001 1800 ROUTE 22 EAST BOX 1587 UNION, NEW JERSEY 07083.1587 Mr. Thomas Welsh (908) 888.7600 CITIBANK FAX (eon) eme-8636

111 Well Street www,hrilmann,env,=m 23ie Floor/ Zone 2 Now York,NY 10043

RE: 111 Wall Street Indoor Air Quality levesdgatioO, September 21.2001

Dear Mr. Welsh:

Thank you for obtaining Elillaoatm Environtnetttal Group, LLC to address your envirotuaeotal concerns.

On September 21, 2001, an Indoor Air Quality Investigation was conducted on the 7`° and 21` floors of the Citibank (acuity located at ill Wall Street, New York, NY. This survey was initiated in order to determine if any adverse health effects may occur inside the subject space as a result of the roecrlt World Trade Center collapse. The chosen parameters temperature, relative humidity, carbon dioxide, carbon monoxide, volatile organic compounds. oxygen, hydrogen sulfide, and combustible gasses, Air samples were talimi and analyzed for the presence of asbestos. also

Observed indoor temperattnee ranged from 75'F to 76"F and observed relative humidities ranged from 62% to 65%, The American Society of Hearing, Refrigeration and Air-Conditioning Engmcars (ASHRAE) ds that the temperature recur

within theneI

of660P to 76°F and that stay

range

relative

humidity

stay

to 60%.

30% range time within

of

were Temperatures

the

within range.

recommended

Relative

humidities

ended reeomri

above the

were range.

levels were However,

outdoor

and

equivalently

were high

the

cause probable

levels.

indoor of

levels the in dioxide

Carbon

subject

space ranged

665 ppm to

from

742 ppm,

ASIdRAE

recoamnends

that

below the

dioxide levels remmain

carbon esrdoor

the Since 700

ppm. plus reading

outdoor

reading

SSO

was

limit

the 1250 recommended

ppm. is ppm,

The

indoor

dioxide

carbon

levels

were

below the

recommended

limit.

Carbon monoxide levels were below the limit of detection of I ppm and therefore below the Environmental (EPA)

Agency National Protection

Ambient

Air

(NAAQS)

Quality Standard

9

ppm. of

Volatile

were

organic compounds

to

found

be

the below

limit

of of

0.1

detection

ppm,

Hlihnann

these

that compounds

levels of recomn=ds

below

remain

three

en times

background outdoor

reading.

the

Since below

was the

reading outdoor

limit

of

0.1 ppm, detection of

th e

recommended

be level

would

0.3

below

to be were

found Levels

ppm the

limit. recommended

oxygen

The

normal level of in air is

20.9%. If

oxygen

in a space levels

at or

are

below

19.5%, the

is space

defiant.

Levels of

oxygen consider

oxygen in

space subject the

to ranged

21.2%

21.3%

and

within the

recoaimanded levels.

10/03/01 WED 10:06

NO

(TX/RI

36191

000094835 NYC-WTC