6 MONITORING RESULTS

6.1 Air Quality

6.1.1 1-hour TSP monitoring was carried out at three monitoring locations during the reporting period. All monitoring data are presented in Appendix J. A summary of the measured 1-hour TSP levels is given in Table 6.1. Graphical presentations of the 1-hour TSP monitoring results for the reporting period and the trend of 1-hour TSP results are shown in Appendix K.

Table 6.1 Summary of 1-hour TSP Impact Monitoring Results

Location I.D.	1-hour TSP (mg/m^3)		Action Level (mg/m^3)	Limit Level (mg/m^3)
	Mean	Range
ASR1	173.7	100.1 - 283.0	318	500
ASR2	260.9	181.7 - 318.6	324	500
ASR3	105.4	61.8 - 157.8	289	500

6.1.2 24-hour TSP monitoring was carried out at three monitoring locations during the reporting period. All monitoring data are presented in Appendix J. A summary of the measured results is given in Table 6.2. Graphical presentation of the results and the trend of 24-hour TSP results are shown in Appendix K.

Table 6.2 Summary of 24-hour TSP Impact Monitoring Results

Location I.D.	24-hour TSP (mg/m^3)		Action Level (mg/m^3)	Limit Level (mg/m^3)
	Mean	Range
ASR1	48.1	13.7 - 76.3	163	260
ASR2	128.0	62.9 - 177.3	178	260
ASR3	31.5	8.5 - 48.9	178	260

6.1.3 No exceedances of the Action/Limit Levels of 1-hour and 24-hour TSP were recorded at ASR1, ASR2 and ASR3 during the reporting period. The wind data monitoring results recorded during the reporting period are summarized in Appendix L.

Observations

6.1.4 Several significant dust sources were identified during the reporting period and they were mainly contributed by the following activities:

i. excavation;

ii. other construction activities nearby; and

iii. on/off road traffic dust.

6.2 Noise

6.2.1 In accordance with the approved EM&A Manual no noise monitoring was carried out in the presence of fog, rain and wind with a steady speed exceeding 5m/s, or wind gust exceeding 10m/s. Furthermore, an additional 3dB(A) facade correction for free field measurements were made for all monitoring locations.

6.2.2 In order to assess the construction noise impact effectively for all noise monitoring locations (NSR1 to NSR3) from the Phase 1 Contract, an adjustment approach was adopted since 1^st March 2005 and had been consulted with EPD to audit merely the construction noise levels against the statutory noise limits. The measured noise levels were adjusted with the corresponding baseline levels in order to facilitate the interpretation of the construction noise levels and this in turn would determine the actual construction noise impact contributed solely by the Phase 1 construction activities. No adjustment will be made on the measured noise level, if the measured noise level is lower or equal to the corresponding baseline level.

Normal Hour Monitoring

6.2.3 Daytime noise monitoring was carried out at all noise monitoring stations during the reporting period. All corrected noise levels are presented in Appendix M1. A summary of the results is given in Table 6.3. Graphical presentation of the monitoring results for the reporting period and the trend of monitoring results are shown in Appendix N1.

Table 6.3 Summary of Corrected Impact Noise Levels for Normal Hour Monitoring

Daytime 0700-1900 hrs on normal weekdays	Measured Noise Level^1,dB(A), (Range)			Construction Noise Level, dB(A) (Range)	Limit Level dB(A)
	Leq(30min)	L10(30min)	L90(30min)	Leq(30min)	Leq(30min)
NSR1	58.5 – 63.6	60.2 – 64.5	56.4 – 62.5	-  ^2	75
NSR2	69.2 – 75.2	70.6 – 77.6	67.6 – 70.8	- ^2	75
NSR3	67.5 – 70.0	68.7 – 70.9	66.1 – 68.8	56.9 – 66.9 ^3	75

¹ Additional 3dB (A) façade correction was made to the Free-field measurements.

² No adjustments were made on all measured noise levels, since corresponding baseline level ≥ measured noise level.

³ No adjustments were made on some of the measured noise levels, since corresponding baseline level ≥ measured noise level. The measured noise levels were mainly dominated by local traffic noise and the construction noise generated from the Phase 1 Contract was not noticeable at NSR according to the field study record.

Observations

6.2.4 The major noise sources identified during the normal hour in this reporting period were dominated by traffic noise from adjacent roads. Occasionally construction noise such as on/off site traffic and concrete breaking were noticeable at NSR2.

Restricted Hour Monitoring

6.2.5 Construction works were carried out at site area P1-SA1 during public holidays. Therefore noise monitoring was carried out at the closest monitoring station, NSR2 during public holidays (i.e. 0700 to 1900 hours on holidays) when construction works were carried out.

6.2.6 All facade corrected noise levels are presented in Appendix M2. A summary of the results is given in Table 6.4. Graphical presentation of the monitoring results for the reporting period and the trend of the monitoring results are shown in Appendix N2.

Table 6.4 Summary of Corrected Impact Noise Levels for Restricted Hour Monitoring

Public Holiday (0700-1900 hrs on holiday)	Measured Noise Level^1,dB(A), (Range)			Construction Noise Level, dB(A) (Range)	Limit Level dB(A)
	Leq(5min)	L10(5min)	L90(5min)	Leq(5min)	Leq(5min)
NSR1	No restricted hour noise monitoring were carried out				70
NSR2	65.1 – 77.0	65.8 – 79.8	64.2 – 70.1	59.2 – 71.4 ^3	70
NSR3	No restricted hour noise monitoring were carried out				70

¹ Additional 3dB (A) façade correction was made to the Free-field measurements.

² No adjustments were made on all measured noise levels, since corresponding baseline level ≥ measured noise level.

³ No adjustments were made on some of the measured noise levels, since corresponding baseline level ≥ measured noise level. The measured noise levels were mainly dominated by local traffic noise and the construction noise generated from the Phase 1 Contract was not noticeable at NSR according to the field study record.

Observations

The major noise sources during the restricted hour monitoring were dominated by the traffic noise from Route 3 and local traffic network (such as Container Port Road).