APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: April 2004

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. (%)
06/04/2004	71	67	80	76	18.5	100	86
12/04/2004	29	27	29	32	7.6	230	80
18/04/2004	(2)	82	59	63	15.9	280	72
20/04/2004	61	-	-	-	6.1	120	79
24/04/2004	85	80	76	69	35.5	100	85
30/04/2004	(2)	46	55	54	12.3	070	86

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
06/04/2004	15:00-15:59	87	81	87
	16:00-16:59	81	74	86
	17:00-17:59	80	75	85
12/04/2004	15:00-15:59	24	28	30
	16:00-16:59	30	42	33
	17:00-17:59	32	30	30
18/04/2004	15:00-15:59	110	144	108
	16:00-16:59	108	133	108
	17:00-17:59	126	167	109
24/04/2004	15:00-15:59	69	69	76
	16:00-16:59	65	65	74
	17:00-17:59	74	70	78
30/04/2004	15:00-15:59	55	71	44
	16:00-16:59	63	54	57
	17:00-17:59	73	62	61

Remark:

(1) The monitoring stations, Reservoir, East Gate & Ash Lagoon are located within Lamma Power Station.

(2) High Volume Air Sampler at AM1 was found defective during the collection of filter paper on 19/4/2004 and 3/5/2004. The defect was rectified on the same day. A make-up 24 hr TSP sampling for AM1 was performed on 20/4/2004 and 4/5/2004 respectively.

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