5.22 SWIMMING EXTERNAL
The swimming external exposure pathway is based on
the same swimming exposure time parameters as for the other swimming exposure
routes. Default parameter values for the swimming external exposure pathway
are given in Table 5.21.
TABLE 5.19 Air Inhalation Parameter Default Values
|
|
|
|
|
|
Default Value |
| Parameter |
|
Definition |
|
Units |
|
Individual |
|
Population |
| Fai |
|
time fraction |
|
-- |
|
1.0 |
|
1.0 |
| Uai |
|
inhalation rate |
|
m3/d |
|
20 |
|
20 |
TABLE 5.20. Soil Resuspension Inhalation Parameter Default Values
|
|
|
|
|
|
Default Value |
| Parameter |
|
Definition |
|
Units |
|
Individual |
|
Population |
| RF |
|
resuspension factor |
|
m-1 |
|
1.E-8 |
|
1.E-8 |
| ML |
|
mass loading factor |
|
kg/m3 |
|
1.E-7 |
|
1.E-7 |
| Fdi |
|
time fraction |
|
-- |
|
1.0 |
|
1.0 |
| Udi |
|
inhalation rate |
|
m3/d |
|
20 |
|
20 |
TABLE 5.21. Swimming External Exposure Parameter Default Values
|
|
|
|
|
|
Default Value |
| Parameter |
|
Definition |
|
Units |
|
Individual |
|
Population |
| Fwe |
|
time fraction |
|
-- |
|
1.0 |
|
1.0 |
| TEw |
|
swimming event time |
|
h/event |
|
0.5 |
|
0.5 |
| FEsw |
|
swimming frequency |
|
event/d |
|
0.066 |
|
0.066 |
Note that the product of swimming event time and
swimming frequency is equal to an average daily swimming time of 0.033
hours, consistent with the initial MEPAS daily swimming time.