APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: March 2017

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. (%)
05/03/2017	53	50	58	71	15.9	040	83
11/03/2017	30	28	17	11	31.7	060	88
17/03/2017	45	58	39	26	34.4	060	86
23/03/2017	43	57	46	50	16.3	050	84
29/03/2017	85	73	66 (30/3)*	79	27.7	060	84

* - TSP monitoring at AM3 (Ash Lagoon) was suspended on 29/03/2017 due to replacement work of TEOM TSP sampler. Make-up 24-hr TSP sampling at AM3 was conducted on 30/03/2017.

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
05/03/2017	15:00 - 15:59	64	53	69
	16:00 - 16:59	50	47	70
	17:00 - 17:59	46	42	44
11/03/2017	15:00 - 15:59	19	24	12
	16:00 - 16:59	20	24	11
	17:00 - 17:59	22	32	18
17/03/2017	15:00 - 15:59	30	27	25
	16:00 - 16:59	29	31	23
	17:00 - 17:59	33	36	36
23/03/2017	15:00 - 15:59	13	25	22
	16:00 - 16:59	27	33	28
	17:00 - 17:59	35	33	31
29/03/2017	15:00 - 15:59	75	74	78 (30/3)*
	16:00 - 16:59	82	80	75 (30/3)*
	17:00 - 17:59	82	83	70 (30/3)*

* - TSP monitoring at AM3 (Ash Lagoon) was suspended on 29/03/2017 due to replacement work of TEOM TSP sampler. Make-up 1-hr TSP sampling at AM3 was conducted on 30/03/2017.

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	High Volume Air Sampler
Ash Lagoon	TEOM	TEOM
Tai Yuen Village	-	MINIVOL Portable Sampler