Table 3.2 Summary Statistics of Marine Water Quality in the North Western WCZ at Station NM5 for 2000
Parameter |
|
EPD Monitoring Station
(NM5) |
WPCO WQOs (in marine
waters) |
Temperature
(oC) |
|
23.6 (17.6 – 28.1) |
natural daily level ± 2 oC |
Salinity
(ppt) |
|
27.7 (20.4 – 32.2) |
natural ambient level ± 10 % |
Dissolved
Oxygen (DO) (%
saturation) |
|
82 (52 – 108) |
- |
|
Bottom |
79 (40 – 110) |
- |
DO
(mg L-1) |
|
6.0 (3.7 – 8.6) |
³ 4 mg L-1 |
|
Bottom |
5.7 (2.8 – 8.8) |
³ 2 mg L-1 |
pH
value |
|
7.9 (7.7 – 8.3) |
6.5 - 8.5 (± 0.2 from natural range) |
Secchi
disc (m) |
|
1.5 (1.0 – 2.5) |
- |
Turbidity
(NTU) |
|
15.3 (4.7 – 39.9) |
- |
SS
(mg L-1) |
|
11.1 (2.0 – 26.1) |
£ natural ambient level + 30% |
Silica
(as SiO2) (mg L-1) |
|
1.6 (0.1 – 3.6) |
- |
BOD5
(mg L-1) |
|
0.8 (0.2
– 2.0) |
not
applicable to marine waters |
Nitrite
Nitrogen (mg L-1) |
|
0.05 (0.01
– 0.13) |
- |
Nitrate
Nitrogen (mg L-1) |
|
0.31 (0.10 – 0.82) |
- |
Ammonia
Nitrogen (mg L-1) |
|
0.15 (0.09 – 0.20) |
- |
Unionised
Ammonia (mg L-1) |
|
0.005 (0.002 – 0.014) |
£ 0.021 mg L-1 |
Total
Inorganic Nitrogen (mg L-1) |
|
0.51 (0.27 – 0.99) |
£
0.5 mg L-1 |
Total
Nitrogen (mg L-1) |
|
0.68 (0.45 – 1.20) |
- |
Ortho-Phosphate
(mg L-1) |
|
0.03 (0.01 – 0.04) |
- |
Total Phosphorus (mg L-1) |
|
0.06 (0.04
– 0.08) |
- |
Chlorophyll-a
(µg L-1) |
|
3.8 (0.2 – 25.0) |
- |
E. coli (cfu per 100 mL) |
|
480 (170
– 2300) |
<
610 cfu per 100 mL for keeping live seafood |
Faecal
Coliform (cfu per
100 mL) |
|
1000 (340 – 5300) |
- |
Notes:
1.
Data
are provided by EPD.
2.
Except
as specified, data presented are depth-averaged data.
3.
Data
presented are arithmetic means except for E.
coli and faecal coliforms that are geometric means.
4.
Data
enclosed in brackets indicate ranges.
5. Shaded cells indicate non-compliance with the WQOs.