APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: December 2005

24 hour TSP Measurement:-

Date	TSP concentration (mg/m^3)				Weather Information (From Hong Kong Observatory)
	Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)	Tai Yuen Village (AM4)	Mean Wind Speed (km/hr)	Prevailing Wind Dir. (°)	Mean R.H. (%)
03/12/2005	82	78	81	103	24.7	070	76
09/12/2005	79	76	76	103	29.9	070	78
15/12/2005	143	134	120	114	34.0	020	39
21/12/2005*	230	244	258	196	51.6	020	37
27/12/2005	115	108	160	126	36.3	070	75
29/12/2005	74	70	57	61	20.8	040	83

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
03/12/2005	15:00-15:59	70	68	61
	16:00-16:59	70	68	65
	17:00-17:59	83	94	91
09/12/2005	15:00-15:59	88	89	89
	16:00-16:59	74	80	72
	17:00-17:59	77	82	75
15/12/2005	15:00-15:59	74	93	77
	16:00-16:59	80	82	94
	17:00-17:59	104	124	120
21/12/2005	15:00-15:59	208	207	209
	16:00-16:59	269	236	249
	17:00-17:59	253	194	242
27/12/2005	15:00-15:59	91	106	92
	16:00-16:59	125	113	106
	17:00-17:59	129	116	107

* Action Level exceedances were recorded at all air quality monitoring stations. After investigation, it was found that the RSP concentrations recorded by all EPD monitoring stations on 21 December 2005 were very high. This suggested that the background dust concentration levels had already been high. As no significant dusty activity was carried out in Lamma Extension construction site on that day, it is considered that all the action level exceedances were not related to the site activities. Hence no further action is required. Subsequent repeated samplings were conducted on 29/12/2005 as required.

1-hr TSP 24-hr TSP

(mg/m³) (mg/m³)

Action Level 340 190

Limit Level 500 260

Calibration: Calibration details are shown in appendix F.

Equipment used:

Location	1-hr TSP	24-hr TSP
Reservoir and East Gate	TEOM 1400a	High Volume Air Sampler
Ash Lagoon		Partisol Model 2000 Sampler
Tai Yuen Village	-	MINIVOL Portable Sampler