Table 4.3    Summary Statistics of 2002 Marine Water Quality in the Vicinity of the Macau Ferry Terminal

 

Parameter

 

EPD Monitoring Station

WPCO WQOs (in marine waters)

VM5

VM6

VM7

Temperature (oC)

 

23.1

(16.3 - 27.4)

23.1

(16.3 - 27.4)

23.2

(16.4 - 27.5)

Not more than 2 oC in daily temperature range

Salinity (ppt)

 

31.8

(29.1 - 33.3)

31.8

(28.7 - 33.2)

31.7

(28.7 - 33.2)

Not to cause more than 10% change

Dissolved Oxygen (DO)

(% saturation)

 

81.0

(65 – 104)

77.0

(67.0 – 92.0)

79.0

(68.0 – 103.0)

-

Bottom

73.0

(34 – 103)

69.0

(20.0 – 89.0)

71.0

(47.0 – 85.0)

-

DO (mg/L)

 

5.7

(4.6 – 6.9)

5.5

(4.7 – 6.3)

5.6

(4.6 – 7.0)

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

Bottom

5.2

(2.4 – 6.8)

4.9

(1.4 – 6.3)

5.1

(3.3 – 6.4)

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

pH value

 

8.0

(7.6 – 8.2)

7.9

(7.7 – 8.2)

7.9

(7.6 – 8.3)

6.5 - 8.5 (± 0.2 from natural range)

Secchi disc (m)

 

2.0

(1.0 – 3.0)

1.9

(1.0 – 2.5)

1.7

(1.0 – 3.0)

-

Turbidity (NTU)

 

10

(7.0 - 14.3)

10.4

(7.0 – 14.6)

10.2

(7.3 – 15.6)

-

Suspended Solids (SS) (mg/L)

 

6.0

(3.2 – 13.3)

7.0

(3.4 – 17.0)

6.0

(3.9 – 10.1)

Not more than 30% increase

Silica (as SiO2)

(mg/L)

 

0.7

(0.1 – 1.4)

0.7

(0.2 – 1.4)

0.7

(0.3 – 1.3)

-

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

 

1.2

(0.5 – 2.4)

1.2

(0.7 – 2.3)

1.3

(0.5 – 3.1)

-

Nitrite Nitrogen (NO2-N)  (mg/L)

 

0.03

(0.01 – 0.05)

0.03

(0.01 – 0.05)

0.03

(0.01 – 0.05)

-

Nitrate Nitrogen (NO3-N) (mg/L)

 

0.10

(0.04 – 0.17)

0.10

(0.04 – 0.21)

0.11

(0.06 – 0.21)

-

Ammonia Nitrogen (NH3-N) (mg/L)

 

0.19

(0.05 – 0.42)

0.20

(0.06 – 0.42)

0.21

(0.06 – 0.41)

-

Unionised Ammonia (UIA) (mg/L)

 

0.006

(0.003 – 0.010)

0.006

(0.003 – 0.010)

0.007

(0.003 – 0.011)

Not more than annual average of  0.021 mg/L

Total Inorganic Nitrogen (TIN) (mg/L)

 

0.31

(0.13 – 0.64)

0.33

(0.20 – 0.65)

0.34

(0.20 – 0.66)

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

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

 

 

0.52

(0.30 – 0.90)

0.53

(0.36 – 0.84)

0.54

(0.46 – 0.87)

-

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

 

0.022

(0.007 – 0.040)

0.023

(0.009 – 0.040)

0.023

(0.009 – 0.038)

-

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

 

0.05

(0.03 – 0.08)

0.05

(0.03 – 0.07)

0.05

(0.04 – 0.07)

-

Chlorophyll-a

(µg/L)

 

4.8

(0.6 – 18.9)

4.2

(0.4 – 16.2)

4.2

(0.7 – 19.8)

-

E. coli

(cfu/100 mL)

 

4,500

(630 – 42,000)

5,000

(600 – 19,000)

4,600

(1,500 – 60,000)

-

Faecal Coliform

(cfu/100 mL)

 

11,000

(1,400 – 70,000)

13,000

(2,000 – 70,000)

12,000

(4,100–180,000)

-

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.