ENSR ASIA (H.K.) Ltd.

Date of Sample:

11/3/2007

Project:

HK-SWC (Operational Phase)

Parameter \ Composite

1st

2nd

3rd

4th

Water Truck (Reference)

Suspended Solids (mg/L)

7

4

4

< 2

< 2

Nitrite & Nitrate (mg/L)

1.60

1.55

1.47

1.54

1.49

Total Kjeldahl Nitrogen (mg/L)

1.0

0.3

0.5

< 0.1

< 0.1

Total Phosphorus (mg/L)

< 0.1

< 0.1

< 0.1

< 0.1

< 0.1

Total Organic Carbon (mg/L)

5

2

2

2

< 1

Chemical Oxygen Demand (mg/L)

19

8

6

5

< 2

Copper (mg/L)

0.053

0.003

0.002

0.002

0.006

Lead (mg/L)

< 0.01

< 0.01

< 0.01

< 0.01

< 0.01

Zinc (mg/L)

0.15

0.06

0.05

0.04

0.04

Remarks

Nitrite: < 0.01 mg/L Nitrate: 1.60 mg/L

Nitrite: < 0.01 mg/L Nitrate: 1.55 mg/L

Nitrite: < 0.01 mg/L Nitrate: 1.47 mg/L

Nitrite: < 0.01 mg/L Nitrate: 1.54 mg/L

Nitrite: < 0.01 mg/L Nitrate: 1.49 mg/L

* Remarks: Results of nitrite and nitrate levels in impact samples 1 to 4 were higher than the reference criteria as stated in the EM&A Manual. In reviewing the nitrite and nitrate level of the reference

sample,  i.e. the composite sample taken from the water truck before and after the monitoring, it was already above the reference criteria.  In fact, there was no significant increase of nitrite

and nitrate in the composite samples 1 to 4 when compared that to the reference sample. Therefore, the nitrite and nitrate level at composite samples 1 to 4 attributable to the road

surface pollutants should be below the reference criteria under a storm weather condition.

All measured concentrations of nitrate level complied with the standard for coastal waters of Deep Bay Water Control Zone (50 & 100 mg/L depending on the quantity of discharge) as

stipulated in the Technical Memorandum.