Table 2. Sediment-quality guidelines and screening levels for lakes and reservoirs
[All concentrations are in milligrams per liter, dry weight; TEL, threshold effects level; PEL, probable effects level; TEC, threshold effect concentration; PEC, probable effect concentration; TNRCC, Texas Natural Resource Conservation Commission; NG, no guideline]
|
Trace |
Environment |
Consensus-based |
TNRCC 85th- |
||||
|
TEL |
PEL |
TEC |
PEC |
||||
|
Arsenic |
5.9 |
17.0 |
9.79 |
33.0 |
37.3 |
||
|
Barium |
NG |
NG |
NG |
NG |
297 |
||
|
Cadmium |
.6 |
3.5 |
.99 |
4.98 |
2.00 |
||
|
Chromium |
37.3 |
90.0 |
43.4 |
111 |
40.0 |
||
|
Copper |
35.7 |
197 |
31.6 |
149 |
24.4 |
||
|
Lead |
35.0 |
91.3 |
35.8 |
128 |
58.7 |
||
|
Manganese |
NG |
NG |
NG |
NG |
1,400 |
||
|
Mercury |
.17 |
.486 |
.18 |
1.06 |
.198 |
||
|
Nickel |
NG |
N |
22.7 |
48.6 |
29.9 |
||
|
Silver |
NG |
NG |
NG |
NG |
1.6 |
||
|
Zinc |
123 |
315 |
121 |
459 |
156 |
||
1 Canadian Council of Ministers of the Environment, 1999.
2 MacDonald and others, 2000.
3 Texas Natural Resource Conservation Commission, 2000, table 4–15.