96 
channel seasonal refuge—along with the relevant dissolved oxygen, water 
clarity/SAV restoration acreage, and chlorophyll a criteria are applied through this 
listing decision flowchart. Benthic index of biotic integrity data are also evaluated 
for listing decisions. 
The listing decision flowchart starts with each designated use-segment-applicable 
criterion combination, asking whether that segment was previously listed in category 
5 as impaired based on the specific water quality (dissolved oxygen, water clarity, 
chlorophyll a) or biological (SAV acreage) criterion parameter. If yes, its initial 
listing status remains in category 5 pending new criteria attainment assessments. If 
no, then the flowchart questions whether data now exist to assess criteria attainment. 
SEGMENTS PREVIOUSLY LISTED AS IMPAIRED 
At the second level, the flowchart queries whether the available data are sufficient to 
reassess criteria or index attainment. If yes, the third level asks if the applicable 
criteria or index is attained. If all applicable criteria components and indices have 
been attained, the designated-use segment is then listed in part 2. If no, the desig- 
nated-use segment remains in part 5. If insufficient data exist at the second level to 
assess criteria attainment/index attainment, the designated-use segment previously 
listed as impaired remains in part 5. 
SEGMENTS NOT PREVIOUSLY LISTED AS IMPAIRED 
At the second level, the flowchart queries whether the available data are sufficient 
to reassess criteria or index attainment. If yes, the third level determines whether 
the applicable criteria or index is attained. If all applicable criteria components and 
indices have been attained, the designated-use segment is then listed in part 2. If 
no, the designated-use segment is listed as impaired in part 5. If insufficient data 
exist at the second level to assess criteria attainment/index attainment, the desig¬ 
nated-use segment remains in part 3. 
SHALLOW-WATER DESIGNATED-USE LISTING DECISIONS 
If a shallow-water designated-use segment does not meet its SAV restoration 
acreage, the EPA recommends that the state list this designated-use segment in cate¬ 
gory 5 presuming the shallow-water monitoring data needed to assess water clarity 
acres/criteria attainment do not exist. 
LITERATURE CITED 
Dauer, D.M., M.F. Lane, and R.J. Llanso. 2005. Addendum to the Report: Development of 
Diagnostic Approaches to Determine Sources of Anthropogenic Stress Affecting Benthic 
Community Condition in the Chesapeake Bay. Prepared for U.S. Environmental Protection 
chapter viii 
Framework for Chesapeake Bay Tidal Waters 303(d) List Decision Making 
