Worksheet Table of Contents
Section/Title
Page No.
Worksheet F11b: Consumption of contaminated vegetation by a large mammal, chronic
WS-59
exposure scenario off-site.
scenario.
exposure scenario.
exposure scenario off-site.
scenario.
Worksheet F12: Consumption of contaminated vegetation by a large bird, acute exposure
WS-61
Worksheet F13a: Consumption of contaminated vegetation by a large bird, chronic on-site
WS-62
Worksheet F13b: Consumption of contaminated vegetation by a large bird, chronic
WS-64
Worksheet F14: Consumption of contaminated
insects by a small bird, acute exposure
WS-67
SUMMARY TABLES FOR ECOLOGICAL RISK ASSESSMENT
Worksheet G01: Summary of Exposure Scenarios for terrestrial animals
WS-66
Terrestrial Plants from Runoff.
Terrestrial Plants from Drift and Wind Erosion.
Worksheet G02: Summary of quantitative risk characterization for terrestrial animals.
WS-67
Worksheet G03: Quantitative Risk Characterization for Aquatic Species.
WS-68
Worksheet G04: Summary of Exposure Assessment and Risk Characterization for
WS-69
Worksheet G05: Summary of Exposure Assessment and Risk Characterization for
WS-70
STANDARD REFERENCES FOR WORKSHEETS
WS-71
GENERAL ASSUMPTIONS, VALUES, and MODELS
Worksheet A01 [CONST]
: Constants and
conversion factors used in
calculations
Conversion
ID
Value
mg/lb
mg_lb
453,600
mL/gallon
ml_gal
3,785
lb/gallon to mg/mL
lbg_mgml
119.8
lb/acre to
:
g/cm
2
lbac_ugcm
11.21
lb/acre to mg/cm
2
lbac_mgcm
0.01121
gallons to liters
gal_lit
3.785
Worksheet A02 [STD]
: General Assumptions Used in Worker Exposure Assessments
Parameter
ID
Value
Units
Reference
Body Weight
(General)
Surface area of both
hands
Surface area of lower
legs
Weight of liquid
adhering to surface
of skin after a spill
BW
70
kg
Hands
840
cm
2
LLegs
2070
cm
2
Liq
0.008
mL/cm
2
ICRP (1975), p. 13
U.S. EPA/ORD 1992, p. 8-11
U.S. EPA/ORD 1992, p. 8-11
Mason and Johnson 1987
WS-5
Worksheet A03 [PUBL]
: General Assumptions Used in Exposure Assessments
for the General Public
Verbal Description: This table contains various values used in the exposure assessments for the general public.
Three general groups of individuals are considered: adult male, adult female, and a 2 year old child. Values are
specified for body weight, surface areas for various parts of the body, water intake, fish consumption, and the
consumption of fruits or vegetables. Not all types of value are specified for each group. The only values
specified are those used in the risk assessment.
Description
ID
Value
Units
Reference
Body Weights
Male, Adult
BWM
70
kg
ICRP (1975), p. 13.
Female, Adult
BWF
64
kg
See Note 1 below.
Child, 2-3 years old
BWC
13.3
kg
U.S. EPA/ORD 1996, p. 7-1, Table
7-2
1
This is the average value (63.79 kg), rounded to the nearest kg for 3 different groups of women between 15-49 years old: control (62.07 kg),
pregnant (65.90 kg), and lactating (63.48 kg). See Burnmaster 1998, Table III, p.218. This is identical to the body weight for females, 45-55 years
old, 50
th
percentile from U.S. EPA, 1985, page 5, Table 2-2, rounded to nearest kilogram.
Body Surface Areas
Female, feet and lower legs
SAF1
2915
cm
2
U.S. EPA/ORD 1992, p. 8-11,
Table 8-3, total for feet and lower
legs
Female, exposed skin when
SAF2
5300
cm
2
U.S. EPA/ORD 1992, p. 8-11,
wearing shorts and a T-shirt
Table 8-3,
total for arms, hands,
lower legs, and feet.
Child, male, 2-3 years old,
SAC
6030
cm
2
U.S. EPA/ORD 1996, p. 6-15,
total body surface area
Table 6-6, 50
th
percentile.
Water Intake
Adult
typical
WCAT
2
L/day
U.S. EPA/ORD 1996, p. 3-28,
Table 3-30, midpoint of mean (1.4
L/day) and 90
th
percentile (2.4
L/day) rounded to one significant
place.
lower range for exposure
WCAL
1.4
L/day
U.S. EPA/ORD 1996, p. 3-28,
assessment
Table 3-30, mean
upper range
WCAH
2.4
L/day
U.S. EPA/ORD 1996, p. 3-28,
Table 3-30, 90
th
percentile
Child, <3 years old
typical
WCT
1
L/day
U.S. EPA/ORD 1996, p. 3-28,
Table 3-30, midpoint of mean
(0.61L/day) and 90
th
percentile (1.5
L/day) rounded to one significant
place.
lower range for exposure
WCL
0.61
L/day
U.S. EPA/ORD 1996, p. 3-28,
assessment
Table 3-30, mean
upper range
WCH
1.50
L/day
U.S. EPA/ORD 1996, p. 3-28,
Table 3-30, 90
th
percentile
WS-6
Worksheet A03 [PUBL]
(continued): General Assumptions Used in Exposure Assessments for the General
Public
Description
ID
Value
Units
Reference
Fish Consumption
Freshwater anglers, typical
FAT
0.010
kg/day
U.S. EPA/ORD 1996, p. 10-51,
intake per day over a
average of means from four studies
prolonged period
rounded to one significant place.
Freshwater anglers, maximum
FAU
0.158
kg/day
Ruffle et al. 1994
consumption for a single day
Native American subsistence
FNT
0.081
kg/day
U.S. EPA/ORD 1996, p. 10-51,
populations, typical intake per
median value of 94
individuals
day
Native American subsistence
FNU
0.770
kg/day
U.S. EPA/ORD 1996, p. 10-51,
populations, maximum for a
highest value of 94 individuals
single day
Consumption of Fruits and Vegetables
Consumption of fruit, total
Central
FrTC
0.00168
kg fruit/kg
U.S. EPA/ORD 1996, Table 9-3, p.
bw/day
9-11, Central and upper estimates
are mean and 95
th
percentile,
Lower
FrTL
0.00168
respectively. The 5
th
percentile is
given as zero. For these
Upper
FrTU
0.01244
worksheets, the central estimate is
used for the lower bound.
Consumption
of vegetables, total
Central
VgTC
0.0036
kg veg/kg
U.S. EPA/ORD 1996, Table 9-12,
bw/day
p. 9-12, mean, 5
th
percentile and
Lower
VgTL
0.00075
95
th
percentile.
Upper
VgTU
0.01
Consumption of vegetables, homegrown
Central
VgHC
0.000761
kg veg/kg
U.S. EPA/ORD 1996, Table 12-15,
bw/day
p. 9-14, mean, 5
th
percentile and
Lower
VgHL
0.0000777
95
th
percentile for individuals
Upper
VgHU
0.00492
between 20 and 39 years old..
Worst-case scenario for
VAcute
0.454
kg food
1 lb. The approximate mid range
consumption in a single day,
of the above typical and upper
acute exposure scenario only.
limits based on the 64 kg body
weight.
Miscellaneous
Estimate of dislodgeable
DisL
0.1
none
Harris and Solomon 1992,
data on
residue as a proportion of
2,4-D
application rate shortly after
application.
WS-7