401 ppb
| This graph depicts the total
phosphorus concentration at Site 1 throughout the summer, at the surface,
mid-depth and bottom of the lake. |
|
| An increasing trend can also
be seen in the bottom samples, which contained significantly higher levels of
phosphorus than either surface or mid-depth samples. |
|
| Phosphorus levels peaked in
the bottom samples at 401 ppb.
The greater phosphorus concentration in bottom samples can be
explained by sediment release and strong stratification of the lake during
the summer. |