Table 4

Table 4.4 Summary Statistics of 2003 Marine Water Quality in the Vicinity of the Macau Ferry Terminal

Parameter		EPD Monitoring Station	WPCO WQOs (in marine waters)
Temperature (^oC)		23.4 (171 - 27.5)	23.5 (17.3 - 27.6)	23.5 (17.2 - 27.8)	Not more than 2 ^oC in daily temperature range
Salinity (ppt)		32.1 (29.4 - 33.4)	32.0 (29.8 - 33.3)	31.0 (21.7 - 33.3)	Not to cause more than 10% change
Dissolved Oxygen (DO) (% saturation)		75 (61 – 88)	74 (58 – 85)	76 (61 – 91)	-
Bottom	71 (53 – 88)	69 (44 – 85)	72 (55 – 91)	-
DO (mg/L)		5.3 (4.1 – 6.9)	5.3 (3.9 – 6.7)	5.4 (4.1 – 6.9)	Not below 4 mg/L for 90% of the samples
Bottom	5.0 (3.7 – 6.9)	4.9 (3.1 – 6.7)	5.1 (3.8 – 6.8)	Not below 2 mg/L for 90% of the samples
pH value		8.1 (8.0 – 8.2)	8.0 (7.9 – 8.2)	8.1 (7.9 – 8.2)	6.5 - 8.5 (± 0.2 from natural range)
Secchi disc (m)		2.3 (1.5 – 4.1)	2.3 (1.5 – 4.0)	2.1 (1.3 – 3.2)	-
Turbidity (NTU)		8.6 (5.4 - 11.0)	8.8 (5.4 – 12.2)	8.9 (4.7 – 14.2)	-
Suspended Solids (SS) (mg/L)		4.7 (5.7 - 7.5)	5.1 (2.4 – 9.8)	5.8 (2.8 – 13.3)	Not more than 30% increase
Silica (as SiO₂) (mg/L)		0.8 (0.3 – 1.4)	0.9 (0.2 – 1.4)	1.0 (0.5 – 3.2)	-
5-day Biochemical Oxygen Demand (BOD₅) (mg/L)		1.4 (0.7 – 2.2)	1.1 (0.5 – 2.0)	1.2 (0.6 – 2.4)	-
Nitrite Nitrogen (NO₂-N) (mg/L)		0.03 (0.01 – 0.05)	0.03 (0.01 – 0.05)	0.04 (0.01 – 0.14)	-
Nitrate Nitrogen (NO₃-N) (mg/L)		0.11 (0.04 – 0.21)	0.11 (0.04 – 0.19)	0.16 (0.05 – 0.58)	-
Ammonia Nitrogen (NH₃-N) (mg/L)		0.20 (0.07 – 0.34)	0.20 (0.09 – 0.34)	0.21 (0.11 – 0.31)	-
Unionised Ammonia (UIA) (mg/L)		0.009 (0.005 – 0.014)	0.009 (0.005 – 0.015)	0.009 (0.005 – 0.016)	Not more than annual average of 0.021 mg/L
Total Inorganic Nitrogen (TIN) (mg/L)		0.33 (0.22 – 0.50)	0.34 (0.25 – 0.50)	0.40 (0.28 – 0.93)	Not more than annual water column average of 0.4 mg/L
Total Nitrogen (Total-N) (mg/L)		0.52 (0.33 – 0.65)	0.52 (0.35 – 0.64)	0.58 (0.44 – 1.15)	-
Ortho-Phosphate (Ortho-P) (mg/L)		0.036 (0.02 – 0.050)	0.037 (0.02 – 0.050)	0.037 (0.02 – 0.050)	-
Total Phosphorus (Total-P) (mg/L)		0.06 (0.03 – 0.08)	0.06 (0.0 4 – 0.07)	0.06 (0.04 – 0.08)	-
Chlorophyll-a (µg/L)		4.0 (0.3 – 22.7)	3.5 (0.4 – 16.7)	3.3 (0.3 – 15.6)	-
E. coli (cfu/100 mL)		5,200 (640 – 42,000)	3,000 (250 – 14,000)	5,900 (500 – 22,000)	-
Faecal Coliform (cfu/100 mL)		12,000 (2,500 – 100,000)	7,000 (1,100 – 26,000)	14,000 (1,200–60,000)	-

Parameter

EPD Monitoring Station

WPCO WQOs (in marine waters)

VM5

VM6

VM7

Temperature (^oC)

23.4

(171 - 27.5)

23.5

(17.3 - 27.6)

23.5

(17.2 - 27.8)

Not more than 2 ^oC in daily temperature range

Salinity (ppt)

32.1

(29.4 - 33.4)

32.0

(29.8 - 33.3)

31.0

(21.7 - 33.3)

Not to cause more than 10% change

Dissolved Oxygen (DO)

(% saturation)

(61 – 88)

(58 – 85)

(61 – 91)

Bottom

(53 – 88)

(44 – 85)

(55 – 91)

DO (mg/L)

5.3

(4.1 – 6.9)

5.3

(3.9 – 6.7)

5.4

(4.1 – 6.9)

Not below 4 mg/L for 90% of the samples

Bottom

5.0

(3.7 – 6.9)

4.9

(3.1 – 6.7)

5.1

(3.8 – 6.8)

Not below 2 mg/L for 90% of the samples

pH value

8.1

(8.0 – 8.2)

8.0

(7.9 – 8.2)

8.1

(7.9 – 8.2)

6.5 - 8.5 (± 0.2 from natural range)

Secchi disc (m)

2.3

(1.5 – 4.1)

2.3

(1.5 – 4.0)

2.1

(1.3 – 3.2)

Turbidity (NTU)

8.6

(5.4 - 11.0)

8.8

(5.4 – 12.2)

8.9

(4.7 – 14.2)

Suspended Solids (SS) (mg/L)

4.7

(5.7 - 7.5)

5.1

(2.4 – 9.8)

5.8

(2.8 – 13.3)

Not more than 30% increase

Silica (as SiO₂)

(mg/L)

0.8

(0.3 – 1.4)

0.9

(0.2 – 1.4)

1.0

(0.5 – 3.2)

5-day Biochemical Oxygen Demand (BOD₅) (mg/L)

1.4

(0.7 – 2.2)

1.1

(0.5 – 2.0)

1.2

(0.6 – 2.4)

Nitrite Nitrogen (NO₂-N) (mg/L)

0.03

(0.01 – 0.05)

0.03

(0.01 – 0.05)

0.04

(0.01 – 0.14)

Nitrate Nitrogen (NO₃-N) (mg/L)

0.11

(0.04 – 0.21)

0.11

(0.04 – 0.19)

0.16

(0.05 – 0.58)

Ammonia Nitrogen (NH₃-N) (mg/L)

0.20

(0.07 – 0.34)

0.20

(0.09 – 0.34)

0.21

(0.11 – 0.31)

Unionised Ammonia (UIA) (mg/L)

0.009

(0.005 – 0.014)

0.009

(0.005 – 0.015)

0.009

(0.005 – 0.016)

Not more than annual average of 0.021 mg/L

Total Inorganic Nitrogen (TIN) (mg/L)

0.33

(0.22 – 0.50)

0.34

(0.25 – 0.50)

0.40

(0.28 – 0.93)

Not more than annual water column average of 0.4 mg/L

Total Nitrogen (Total-N) (mg/L)

0.52

(0.33 – 0.65)

0.52

(0.35 – 0.64)

0.58

(0.44 – 1.15)

Ortho-Phosphate (Ortho-P) (mg/L)

0.036

(0.02 – 0.050)

0.037

(0.02 – 0.050)

0.037

(0.02 – 0.050)

Total Phosphorus (Total-P) (mg/L)

0.06

(0.03 – 0.08)

0.06

(0.0 4 – 0.07)

0.06

(0.04 – 0.08)

Chlorophyll-a

(µg/L)

4.0

(0.3 – 22.7)

3.5

(0.4 – 16.7)

3.3

(0.3 – 15.6)

E. coli

(cfu/100 mL)

5,200

(640 – 42,000)

3,000

(250 – 14,000)

5,900

(500 – 22,000)

Faecal Coliform

(cfu/100 mL)

12,000

(2,500 – 100,000)

7,000

(1,100 – 26,000)

14,000

(1,200–60,000)

Note: 1. Except as specified, data presented are depth-averaged values calculated by taking the means of three depths: Surface, mid-depth, bottom.

2. Data presented are annual arithmetic means of depth-averaged results except for E. coli and faecal coliforms that are annual geometric means.

3. Data in brackets indicate the ranges.