Table 5.4 Calculation of Unionised Ammoniacal Nitrogen Concentrations during Dredging
|
Sensitive Receiver |
Elevation in SS concentration (mg/L) |
NH3-N in Sediment (mg kg-1)(1) |
Increase in Unionised Ammonia (mg/L) |
Background Unionised Ammonia (mg/L)(2) |
Total Unionised Ammonia (mg/L) |
|
Gazetted FCZ at Picnic Bay |
46.3 |
39.1 |
8.5 x 10-5 |
0.002 |
0.0021 |
|
Secondary Contact Recreation Subzone at Mo Tat Wan |
27.8 |
39.1 |
5.1 x 10-5 |
0.002 |
0.0021 |
Notes: (1) Maximum concentration recorded from marine sediment testing at Sok Kwu Wan
(2) Taken from EPD routine water quality monitoring data (2000)