APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: April 2002

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. (%)
05/04/2002	91	26	25	33	22.3	190	79
11/04/2002	72	71	(2)	36	26.5	360	80
13/04/2002	-	-	45	-	17.3	070	73
17/04/2002	36	38	31	26	7.6	120	83
23/04/2002	19	26	20	28	11.8	090	81
29/04/2002	35	32	32	46	19.9	060	85

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
05/04/2002	15:00-15:59	37	33	31
	16:00-16:59	30	21	19
	17:00-17:59	25	25	20
11/04/2002	15:00-15:59	81	72	70
	16:00-16:59	92	91	85
	17:00-17:59	92	120	86
17/04/2002	15:00-15:59	24	44	27
	16:00-16:59	17	25	31
	17:00-17:59	73	69	44
23/04/2002	15:00-15:59	10	12	14
	16:00-16:59	7	19	14
	17:00-17:59	43	27	29
29/04/2002	15:00-15:59	30	31	32
	16:00-16:59	52	34	32
	17:00-17:59	35	34	33

Remark:

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

(2) Partisol TSP sampler at AM3 (Ash Lagoon) was found defective during the collection of filter paper on 12/4/2002. The defect was rectified on the same day. A make-up 24hr TSP sampling for AM3 was carried out on 13/4/2002.

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 G.

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