TABLE 1.
Physical parameters of streams
| Site | Catchment area (square miles) | Steambed gradient | Substratum type | Avg pH | Mean concn (SE) ofa:
|
||||
|---|---|---|---|---|---|---|---|---|---|
| As | Cd | Cu | Pb | Zn | |||||
| LB | 407 | 0.004 | Small cobbles/gravel | 8.3 | 6.01 (0.80) | 0.29 (0.03) | 4.41 (0.40) | 8.26 (0.38) | 21.9 (1.04) |
| RC | 885 | 0.007 | Large cobbles/gravel | 8.1 | 2.01 (0.40) | 0.11 (0.01) | 1.43 (0.13) | 2.59 (0.20) | BDL (N/A) |
| BH | 2,665 | 0.003 | Large cobbles/gravel | 8.0 | 2.85 (0.11) | 0.11 (0.01) | 1.14 (0.10) | 3.71 (0.13) | 6.77 (0.02) |
| CF | 3,641 | 0.006 | Large cobbles/gravel | 7.9 | 3.68 (0.23) | 0.45 (0.01) | 30.1 (1.12) | 7.87 (0.19) | 108 (7.71) |
| GC | 1,760 | 0.004 | Large cobbles/gravel | 8.3 | 5.88 (0.38) | 0.53 (0.04) | 65.9 (5.33) | 13.9 (1.74) | 147 (7.17) |
| SB | 363 | 0.004 | Small cobbles/gravel | 8.2 | 68.9 (19.9) | 1.84 (0.12) | 332 (45.6) | 69.8 (8.91) | 433 (74.7) |
a
Values are mean concentrations (micrograms of metal/gram [dry wt] of sediment) and standard errors of each metal associated with hyporheic sediments gathered from each stream. Detection limit for Zn, 0.04 μg/g. BDL, below detection limit; N/A, not applicable.