DEP letter regarding dust survey, 101 Maiden Lane, April 2002

NYC 9/11 Public Portal Document 04/09/2002 15:10 FAX (¢1004 4D002 04/09/2002 08:52 FAX 2129444618 AMBIENT GROUP

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Ms. Carolyn Malloy Colliers AER 40 East 52°d Street New York.NY 10022

Re: Exterior Assessment of Possible Building Contamination Project #220385

Dear Ms. Malloy:

On April 2, 2002, Ambient Group, Inc. collected bulk samples of stu:pect dust/debris material located on the roof/setbacks, parapet walls and window sills at 101 Maiden Lane. The purpose of the sampling was to determine whether the possibility of asbestos conu:mination occurred to the exterior of the building result of the collapse of the World Trade Crafter. In addition, a recent as

a

visual survey by the New York City Department of Environmental Protec,.ion (NYCDEP) indicated that suspect dust was observed on the building's exterior. As a result, Ambient Group was requested to collect appropriate representative samples of the suspect materials observed by the NYCDEP.

of

A total

bulk eight

(8)

were

samples collected

suspect

of dust/debris

materials selected

roofs,

from

parapets and window sills and analyzed by Polarized Light Microscopy (r YSDOH ELAP Method 198.1). Analytical results indicated that none of the samples contained as )estos in excess of 1% by weight.

Based on the above, the dust and debris identified by the AtYCDEP as being suspect is not an considered to be

asbestos

containing

material

and

(ACM) further

.u•tions no

be

should required.

Attached please

a nd fi

of description

bulk the

and

sampling

sample

analysis

used during protocols

project, this

well as as a

copy of

the

Bulk

Sample

Laboratory

Data this

Repor:s for

project. Should

you have any questions regarding this information, please do not hesitate a call.

Sincerely,

Sign for

bient

Group, Inc.

by:

Jo

P. S

n, CIH,

CSP

of

Field ctor

Operations

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NY

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