Table 4.6a            Calculated Action and Limit Levels for In-situ Monitoring    Parameters (Dissolved Oxygen)

Case

Monitoring Stations

Water Depth

Action Level

Limit Level

Case 1

All Case 1’s stations

Surface and Middle

4.2

4(1)

Bottom

4.0

3.7

Case 2

All Case 2’s stations

Surface and Middle

6.1

5.8

Bottom

6.0

5.7

Case 3

All Case 3’s stations

Surface and Middle

4.5

4.1

Bottom

4.1

3.8

Case 4

All Case 4’s stations

Surface and Middle

6.5

6.5

Bottom

6.4

6.3

 

Notes:

1)   4 mg/L was selected as the limit levels, since the 1 percentile of the DO baseline data were lower than the recommended limit level of 4 mg/L.

-       For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limit levels.