APPENDIX B Action and Limit Levels

 

Air Quality

 

1-hr TSP

 

Monitoring Stations

Location

Action Level, μg/m3

Limit Level, μg/m3

AM1

Tin Hau Temple

275

500

AM2

Sai Tso Wan Recreation Ground

273

AM3

Yau Lai Estate Bik Lai House

271

AM4

Sitting-out Area at Cha Kwo Ling Village

278

AM5(A)

Tseung Kwan O DSD Desilting Compound

273

AM6(A)

Park Central, L1/F Open Space Area

285

 

24-hr TSP

 

Monitoring Stations

Location

Action Level, μg/m3

Limit Level, μg/m3

AM1

Tin Hau Temple

173

260

AM2

Sai Tso Wan Recreation Ground

192

AM3

Yau Lai Estate Bik Lai House

167

AM4(A)

Cha Kwo Ling Public Cargo Working Area Administrative Office

210

AM5(A)

Tseung Kwan O DSD Desilting Compound

175

AM6(A)

Park Central, L1/F Open Space Area

165

 

Noise

 

Time Period

Action Level

Limit Level

0700-1900 hrs on normal weekdays

When one documented complaint is received from any one of the monitoring stations

75 dB(A) (1)

1900-2300 on all days and 0700-2300 on general holidays (including Sundays)

60/65/70 dB(A)(2)(3)

2300-0700 on all days

45/50/55 dB(A)(2)(3)

1 70 dB(A) for schools and 65 dB(A) for schools during examination period.

2 Acceptable Noise Levels for Area Sensitivity Rating of A/B/C

3 If works are to be carried out during restricted hours, the conditions stipulated in the construction noise permit issued by the Noise Control Authority have to be followed.

 


 

Water Quality

 

Groundwater

 

Parameters

Action

Limit

DO in mg L-1

7.6

7.6

pH

6.0 8.9

6.0 9.0

BOD5 in mg L-1

2.0

2.0

TOC in mg L-1

Stream 1 and Stream 2: 9

Stream 1 and Stream 2: 9

Stream 3: 6

Stream 3: 6

Total Nitrogen in mg L-1

2.0

2.1

Ammonia-N in mg L-1

0.15

0.20

Total Phosphate in mg L-1

0.05

0.05

SS in mg L-1

7.6

12.1

Turbidity in NTU

2.1

2.3

Notes:

1. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

2. For turbidity, SS, 5-day biochemical oxygen demand (BOD5), Total organic carbon (TOC), Total Nitrogen, Ammonia-N and Total Phosphate, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

3. All the figures given in the table are used for reference only and the EPD may amend the figures whenever it is considered as necessary.

 

Groundwater Level Monitoring

 

Drill Hole No.

38568-LDH1

TKO-LBH907

Action Level (mPD)

+74.65

+17.59

 


Marine Water Quality

 

Parameter (unit)

Depth

Action Level

Limit Level

DO in mg/L

(See Note 1 and 4)

Stations G1-G4, M1-M5

Depth Average

4.9 mg/L

4.6 mg/L

Bottom

4.2 mg/L

3.6 mg/L

Station M6

Intake Level

5.0 mg/L

4.7 mg/L

Turbidity in NTU

(See Note 2 and 4)

Stations G1-G4, M1-M5

Bottom

19.3 NTU

or 120% of upstream control station's Turbidity at the same tide of the same day

22.2 NTU

or 130% of upstream control station's Turbidity at the same tide of the same day

Station M6

Intake Level

19.0 NTU

19.4 NTU

SS in mg/L

(See Note 2 and 4)

Stations G1-G4

Surface

6.0 mg/L

or 120% of upstream control station's SS at the same tide of the same day

6.9mg/L

or 130% of upstream control station's SS at the same tide of the same day

Stations M1-M5

Surface

6.2 mg/L

or 120% of upstream control station's SS at the same tide of the same day

7.4 mg/L

or 130% of upstream control station's SS at the same tide of the same day

Stations G1-G4, M1-M5

Bottom

6.9 mg/L

or 120% of upstream control station's SS at the same tide of the same day

7.9 mg/L

or 130% of upstream control station's SS at the same tide of the same day

Station M6

Intake Level

8.3 mg/L

8.6 mg/L

Notes:

1. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

2. For turbidity, SS, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

3. All the figures given in the table are used for reference only and EPD may amend the figures whenever it is considered as necessary.

4. Action and limit values are derived based on baseline water quality monitoring results to show the actual baseline water quality condition.

 

 

 

 

 

Ecology

 

Post-translocation Coral Monitoring

 

Parameter

Action Level Definition

Limit Level Definition

Mortality

If during Impact Monitoring a 15% increase in the percentage of partial mortality on hard corals occurs at more than 20% of the tagged coral at any one Impact Monitoring Site that is not recorded at the Control Site, then the Action Level is exceeded.

If during the Impact Monitoring a 25% increase in the percentage of partial mortality occurs at more than 20% of the tagged coral at any one Impact Monitoring Site that is not recorded at the Control Site, then the Limit Level is exceeded.

 

 

Landfill Gas Monitoring

 

Parameter

Limit Level

Oxygen

<19%

<18%

Methane

>10% LEL (i.e. > 0.5% by volume)

>20% LEL (i.e. > 1% by volume)

Carbon Dioxide

>0.5%

>1.5%