Table 1. Concentrations of organic carbon, DDE, selected PAHs, and metals in suspended sediments discharging from the Barton Springs system

[Concentrations exceeding the TEC shown in blue and one exceeding the PEC shown in red; see text for additional compounds not detected. µg/kg, micrograms per kilogram; mg/kg, milligrams per kilogram; I.S., insufficient sediment for analysis; E, estimated; <, less than; TEC, threshold effect concentration (MacDonald and others, 2000); --, not applicable; PEC, probable effect concentration (MacDonald and others 2000)]


Spring
Date
Organic
carbon
(per-
cent)
DDE
(µg/kg)
Total
PAH
(µg/kg)
Anthra-
cene
(µg/kg)
Fluoran-
thene
(µg/kg)
Pyrene
(µg/kg)
Benz[a]-
anthra-
cene
(µg/kg)
Chry-
sene
(µg/kg)
Benzo(a)-
pyrene
(µg/kg)
Arsenic
(mg/kg)
Cad-
mium
(mg/kg)
Chro-
mium
(mg/kg)
Cop-
per
(mg/kg)
Mer-
cury
(mg/kg)
Nickel
(mg/kg)
Lead
(mg/kg)
Zinc
(mg/kg)

Eliza 110300
I.S.
E4.3
   E769
 E30.3
  E105
   E89.2
  E62.6
 E96.3
E107
19.8
0.96
  71.8
  63.2
0.015
37.7
34.9
138
  111601
4.73
<19
   E322
 E36.1
     E37.7
  E37.3
  E58.2
  E4.1
   E75.5
23.2
  .47
  83.3
  41.4
I.S.
46.3
32.4
141
                                     
Old Mill 051701
2.72
   E.2
   E102
<10
      16.9
    12.9
    10.3
   16.5
    12.5
15.7
  .19
  49.3
  23.6
  .05
24.6
21.2
   67.6
  111601
I.S.
<12
   E302
  E24.0
  E32.4
   E29.2
  E37.9
   E8.4
  E49.4
24.2
  .62
  94.8
  45.0
I.S.
47.1
35.3
160
                                     
Upper Barton 050801
I.S.
   <8.0
   E395
  E18.5
  E53.3
   E46.5
  E37.3
  E27.0
  E41.0
13.9
  .22
  54.2
  20.4
I.S.
51.9
17.0
   83.4
  031202
 <.05
   <1.0
     E80
      3.0
     13.2
     12.1
    E6.8
   E7.4
   E8.2
   2.04
    .075
  11.9
    5.06
  .02
12.8
6.64
   14.4
                                     
Main Barton 110300
2.09
E1.0
   E177
    E5.9
  E23.8
   E19.4
  E12.5
  E21.4
  E25.0
21.0
  .73
  68.6
  28.6
  .07
32.0
22.4
    91.3
  050701
1.67
   <6.0
   E360
  E21.5
  E46.2
   E41.2
  E36.1
  E25.9
  E38.1
10.5
  .40
  36.3
  17.6
  .08
24.2
12.6
   50.4
  082701
I.S.
<10
   E632
  E20.4
  E98.3
   E81.3
  E53.4
  E59.1
  E85.6
18.5
  .37
  62.6
  25.7
I.S.
31.6
23.0
   99.7
  111601
3.56
E1.3
   E328
  E16.8
  E41.2
   E36.3
  E33.9
  E19.5
  E48.4
22.8
  .58
  82.8
  40.8
  .07
44.0
31.8
133
                                     
TEC
--
--
   3.16
  1,610
    57.2
  423
  195
  108
  166
  150
   9.79
  .99
  43.4
  31.6
  .18
22.7
35.8
121
PEC
--
--
31.3
22,800
845
2,230
1,520
1,050
1,290
1,450
33.0
4.98
111
149
1.06
48.6
128
459

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