Dutch Bill Creek 030
5/25/09
|
Site ID |
Time |
Air TempCelsius |
pH |
Water TempCelsius |
Dissolved Oxygen mg/l |
Turbidity NTU |
Conductivity Microsiemens/cm |
|
DBC030 |
12:30 |
20 |
9.0 |
15.5C |
8.1 mg/l |
6.28 |
490
|
Basin Plan Objective of North Coast Area: pH of freshwater should be within 6.5 and 8.5 to protect most organisms.
|
Date |
pH |
|
1/2/09 |
7.5 |
|
2/16/09 |
6.9 |
|
2/22/09 |
7.4 |
|
3/1/09 |
8.5 |
|
3/15/09 |
8.3 |
|
4/19/09 |
8.2 |
|
5/25/09 |
9.0 |
Here are some causes of increased pH
¨ Excess nutrients cause algae growth, increasing pH.
¨ Bedrock and surrounding rock material Limestone (calcium carbonate) naturally raises the pH.
¨ Decreased water temperature.
Effects
¨ Most aquatic life only survive within a narrow pH range
¨ May alter other substances to higher toxicity.