APPENDIX D AIR QUALITY MONITORING RESULTS

Site: Lamma Power Station Extension

Month: October 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. (%)
1/10/2017	12	29	27	35	28.5	90	86
7/10/2017	40	39	17	65	39.7	70	74
13/10/2017	37 (17/10)*	69	56	63	34.8	360	64
19/10/2017	58	75	43	22	33.5	350	71
25/10/2017	66	63	60	71	32.3	70	69
31/10/2017	103	92	94	89	31.2	70	61

Note:

* - TSP monitoring at AM1 (Reservoir) was suspended on 13/10/2017 due to the breakdown of the High
Volume Air Sampler. Make-up 24-hr TSP sampling at AM1 was conducted on 17/10/2017.

1 hour TSP Measurement:-

Date	Time	TSP concentration (mg/m^3)
		Reservoir (AM1)	East Gate (AM2)	Ash Lagoon (AM3)
1/10/2017	15:00 - 15:59	35	27	30
	16:00 - 16:59	19	23	23
	17:00 - 17:59	28	22	21
7/10/2017	15:00 - 15:59	65	54	67 (9/10)*
	16:00 - 16:59	49	38	51 (9/10)*
	17:00 - 17:59	47	37	43 (9/10)*
13/10/2017	15:00 - 15:59	39	57	45
	16:00 - 16:59	33	70	68
	17:00 - 17:59	66	82	76
19/10/2017	15:00 - 15:59	73	71	78
	16:00 - 16:59	48	72	64
	17:00 - 17:59	49	65	51
25/10/2017	15:00 - 15:59	54	54	56
	16:00 - 16:59	55	55	55
	17:00 - 17:59	55	55	54
31/10/2017	15:00 - 15:59	108	92	93
	16:00 - 16:59	108	90	87
	17:00 - 17:59	99	88	82

Note:

* - TSP monitoring at AM3 (Ash Lagoon) was suspended on 07/10/2017 due to the breakdown of the TEOM TSP sampler. Make-up 1-hr TSP sampling at AM3 was conducted on 09/10/2017.

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