TABLE 7.
Fecal coliform populations from the three most contaminated sites of Page Brook watershed
| Sampling site | No. of fecal coliforms/100 ml in samples taken during the indicated period (mo/yr)a
|
% Reduction between avgs | |||||
|---|---|---|---|---|---|---|---|
| Before cattle access was limited
|
After cattle access was limited
|
||||||
| Avg | Minimum | Maximum | Avg | Minimum | Maximum | ||
| 5/97–7/97 | 5/98–7/98 | ||||||
| PB10 | 190 A | 10 | 280 | 306 A | 17 | 530 | None |
| PB12 | 6,015 A | 910 | 11,120 | 1,043 B | 160 | 350 | 82.7 |
| PB16 | 185 A | 0 | 370 | 488 A | 34 | 780 | None |
| 8/97–10/97 | 8/98–10/98 | ||||||
| PB10 | 3,103 A | 410 | 4,800 | 347 B | 190 | 610 | 88.8 |
| PB12 | 42,400 A | 7,900 | 72,000 | 1,596 B | 260 | 4,100 | 96.2 |
| PB16 | 2,347 A | 610 | 4,400 | 934 B | 290 | 1,700 | 60.3 |
| 11/97–2/98 | 11/98–2/99 | ||||||
| PB10 | 245 A | 170 | 370 | 15 B | 0 | 20 | 93.9 |
| PB12 | 1,475 B | 10 | 3,400 | 2,002 B | 10 | 3,900 | None |
| PB16 | 175 A | 0 | 280 | 807 A | 10 | 2,280 | None |
a
Average (arithmetic mean) numbers in each row followed by different letters indicate a significant difference obtained by using Duncan’s multiple-range test (P < 0.01).