Page
1
of
2
1
UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
WASHINGTON
D.
C.,
20460
OFFICE
OF
PREVENTION,
PESTICIDES
AND
TOXIC
SUBSTANCES
August
8,
2005
MEMORANDUM
Subject:
Additional
Background
Information
for
the
Science
Advisory
Panel
(
SAP)
Regarding
Data
Used
in
the
Residential
Section
of
the
Preliminary
NMethyl
Carbamate
Cumulative
Risk
Assessment.

To:
Joe
Bailey,
Designated
Federal
Official
FIFRA
SAP
Office
of
Science
Coordination
and
Policy
(
7101C)

From:
David
Miller
Office
of
Pesticide
Programs,
Health
Effects
Division
(
7509C)

Through:
George
Herndon,
Associate
Director
Office
of
Pesticide
Programs,
Health
Effects
Division
(
7509C)

The
attached
table
provides
further
details
on
the
studies
which
were
considered
in
the
SRA
Presentation
Entitled,
Available
Micro­
Activity
Data
and
their
Applicability
to
Aggregate
Exposure
Modeling.
(
Valerie
Zartarian
et
al.
December
2003).
This
presentation
was
used
in
the
evaluation
of
residential
exposure
for
the
Preliminary
NMethyl
Carbamate
Cumulative
Risk
Assessment.
The
information
supplied
in
this
memorandum
should
be
considered
additional
background
information
for
the
SAP
for
discussion
of
Question
#
2
in
the
residential
section
of
the
questions.
Page
2
of
2
2
Author
No.
Subjects
Description
Videotape
time
Median
frequency/
Other
Information
Black
et
al.,
2003
52
children
in
Laredo,
TX
13
infants;
12,
one
year
olds;
18
two
year
olds;
9
preschool)
living
in
the
vicinity
of
Rio
Bravo,
Texas
Four
hour
videotaped
observations
indoors
13.5/
hour
and
4.9/
hour
outdoors
Tulve
et
al.,
2002
72
urban
Washington
State
children
ages
11
to
60
months
No
video­
tape
(
parental
and
trained
observers).

Observations
for
more
than
one
day
were
available
for
78%
of
the
children".
Mean
 
16
hand
to
mouth
contacts
per
hour
Freeman
et
al.,

2001
19
children
ages
3
to
6
years
living
in
Minnesota
Four
hour
videotaped
observations
Median
3.5
hand
to
mouth
contacts/
hour,
3­
4
years
Median
2.5
contacts/
hour,
5­
6
Reed
et
al.,
1999
30
urban
children
living
in
Newark,
NJ
A
total
of
20
day
care
(
3­
6
yrs)
and
10
at
home
(
2­
5
years)
Mean
hand
to
mouth
frequency
9.5
contacts
per
hour
Zartarian
et
al.,

1998
4
Latino
children
in
agricultural
area
in
California
Single
day
videos
(
6,
7,
8,

10
waking
hours)
Mean
=
9.5
events/
hr.

Letkie
et
al.,
2000
Video
observations
of
suburban
children
ages
1
to
6
years
of
age.
33­
34
hours
of
children
"
in
view"
These
data
were
used
to
enumerate
area
of
hand
mouthed;

Median:
2.3
hand
to
mouth
contacts/
hour;
mean:
7.3
contacts/
hour
