Table VI11-2. Examples of the array of results from the states' 2006 listing cycle evaluation of benthic community health. 
94 
Suspected Sources of 
Benthic Community 
Degradation 
Sediment Contaminants 
Sediment Contaminants 
r • .. 
Unknown 
Low DO 
Low DO 
Unknown 
Low DO 
Unknown 
Eutrophication 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Unknown 
Degraded Samples with 
Insufficient 
Abundance/Biomass; % 
of Total w/o Cont. 
o 
o 
OC 
OO 
tO 
o< 
(N 
42.86 
10.34 
27.27 
o 
o 
o 
© 
20 
13.33 
— 
© 
ZS6 
© 
13.95 
10.42 
Degraded Samples 
with excessive 
Abundance/Biomass; 
% of Total w/o Cont. 
o 
o 
OO 
OO 
tO) 
OO 
OO 
tO 
21.43 
•O 
LO 
o 
o 
o 
o 
© 
L99 
© 
sO 
to 
to 
CO 
SC) 
© 
SO 
r-; 
© 
CO 
CO 
<N 
© 
Samples with 
contaminant 
Posterior 
Probability 
p>= 0.90; 
% of Total 
09 
50 
17.65 
11.76 
7.14 
KOI 
909 
o 
o 
o 
21.43 
6.67 
© 
5.56 
10.53 
9.52 
© 
© 
2.08 
Sample 
Size 
tO 
SO 
r- 
r-» 
28 
29 
33 
— 
— 
— 
tO 
tO 
OO 
Os 
CN 
40 
43 
48 
Mean 
B-IBI 
2.2 
2.4 
2.8 
2.3 
2.3 
CO 
2.6 
CO 
<N 
CO 
3.2 
2.9 
3.4 
3.3 
CO 
3.4 
3.8 
3.3 
re 
Impaired: 
Degraded 
Area? 
>■ 
>- 
>- 
>- 
>- 
>- 
NA 
NA 
NA 
2 
Z 
Z 
Z 
z 
Z 
Z 
N (2) 
N (2) 
Segment 
EBEMHa 
JMSMHb 
ELIPHa 
MAGMH 
CB4MH 
YRKPHa 
CHSMH 
APPTFa 
CHSTF 
CHOTF 
JMSTFa 
GUNOH 
CB8PHa 
CB6PHa 
CB1TF 
POTOH 
CB20H 
CB7PHa 
TANMH 
chapter viii 
Framework for Chesapeake Bay Tidal Waters 303(d) List Decision Making 
NA= Insufficient sample size for impairment decision. 
* See Table 3 in Llanso et al. 2005 
