Procedure
117
may be currently in place or under consideration. A decision tree (Fig.
7.1) is used to guide the process. It specifies what types of information
are necessary for the evaluation and also identifies conditions under
which the criterion should be modified. The selenium criterion value
is examined in the context of site-specific selenium concentrations in
combination with potential and observed toxicity to fish and aquatic
birds. The residue data set required for this process is virtually the
same as for the Protocol (see Chapter 4) and consists of selenium meaMeasured Waterborne Sa Concentrations 1
No Sa Problem
Possible Sa
SUspected
Problem suspocIiKf
ExIsting or Proposed Criterion is not Exceeded
(no Sa problem Indicated)
II'
\0
!
\0
Existing or Proposed
Is Exceeded
(possible Sa problem indicated)
!
Measure Se in Sediment, Food Chain,
Fish, and Aquallc Birds'
Criterion
II not
Appropriate
MonHor
Bird and
Reproduction
Criterion Is
Appropriate.
Monitor Se in Water
Measure Sa In Sediment,
Food CIlain,
Aquatic Birds
and
No Bloaccumulallon
or Diagnostic Se
ResidUes' Present
!
Criterion Is
Appropriate,
Monitor Sa In Water
!
Bloaccumulallon
and Dlagnostlc Se
Residues' Present
!
Criterion
may not be
Examine Birds and
Fish for Se-Induced
Teratogenesis, etc.I
II' \0
Modify Criterion
by Appropriate
Amoune
!
NoSe
Toxicosis
Indicated
!
Se Toxicosis
Indicated
!
MonllorSe In
Sediments, Food
Chain, Fish, Birds'
No Possible
Down-Gradient
Impacts5
!
Criterion
is not
Appropriate
II'
No Bioaccum.
or Diagnostic
Sa Residues
Present·
No Bloaccumulation
or Diagnostic Sa
Residues' Present
Down-Gradlent
Impacts 5
Possible
!
Measure Se in
Down-Gradient
Systems'
\0
Bioaccum.
and
Diagnostic
Sa Residues'
Bloaccumulallon and
Diagnostic Sa Residues'
Present
!
Criterion is
Appropriate
!
examine Birds and
Fish for Se-Induced
Teratogenesis, etc.'
II'
\0
NoSe
Se Toxicosis
Toxicosis
Indicated
Indicated
!
!
!
!
CrIterion
Criterion
Monitor
MDnnor
Is not
Is
Bird and FISh Bird and Fish
Appropriate Appropriate Reproduction" Reproduction'
!
!
!
Amount
Intervention
Nsceasa,r
Modify Crilerion
by Approp9ate
examine Birds and
Fllh for Se-induced
Teratogenesis, etc.'
!
Modify Criterion
II'
MDnilorSa in
II'
NoSe
Se Toxlcosl&
' "
by Approp!!ate
Amount 7
Sediments, Food
Chain, Fish, Birds'
TOxicosis
Indicated
Indicated
Intervention ... Bird and Fish
!
Monitor
Reproduction'
Necessary'
' "
Monitor
Bird and Fish
Reproduction'
!
Bird and Fish -+ Intervention
Monitor
Reproduction'
Necessary"