Lamma Power Station Extension - Summary Results on Water Quality Monitoring

Maximum Outlet Temperature Rise (Deg. Celsius) of Cooling Water at C.W. Outfall No.3 Serving L9, L10 & L11 Condensers

Weighted by Flowrates of Individual Streams (September 2025)

Date	Maximum Outlet Temperature Rise (Deg. Celsius)
1/9/2025	6.2
2/9/2025	6.2
3/9/2025	6.3
4/9/2025	6.3
5/9/2025	6.3
6/9/2025	7.0
7/9/2025	5.8
8/9/2025	5.6
9/9/2025	6.0
10/9/2025	6.9
11/9/2025	7.2
12/9/2025	7.0
13/9/2025	6.3
14/9/2025	6.5
15/9/2025	6.9
16/9/2025	7.1
17/9/2025	6.3
18/9/2025	6.1
19/9/2025	5.7
20/9/2025	5.1
21/9/2025	5.6
22/9/2025	5.6
23/9/2025	6.0
24/9/2025	5.7
25/9/2025	5.8
26/9/2025	6.1
27/9/2025	6.8
28/9/2025	6.4
29/9/2025	6.6
30/9/2025	6.5

Maximum Outlet Temperature Rise (Deg. Celsius) of Cooling Water at C.W. Outfall No.4 Serving Unit L12

Weighted by Flowrates of Individual Streams (September 2025)

Date	Maximum Outlet Temperature Rise (Deg. Celsius)
1/9/2025	6.8
2/9/2025	6.8
3/9/2025	6.8
4/9/2025	6.8
5/9/2025	6.7
6/9/2025	*
7/9/2025	*
8/9/2025	6.2
9/9/2025	6.5
10/9/2025	6.1
11/9/2025	6.2
12/9/2025	6.2
13/9/2025	7.0
14/9/2025	7.0
15/9/2025	7.0
16/9/2025	7.1
17/9/2025	7.1
18/9/2025	6.7
19/9/2025	6.3
20/9/2025	6.4
21/9/2025	6.3
22/9/2025	6.4
23/9/2025	6.7
24/9/2025	6.9
25/9/2025	6.0
26/9/2025	6.4
27/9/2025	*
28/9/2025	*
29/9/2025	6.7
30/9/2025	6.8

Total Residual Chlorine Level at C.W. Outfall No. 3 Serving Units L9, L10 & L11 (September 2025)

Date of sampling	12/09	26/09
Total Residual Chlorine, mg/L	0.30	0.20

Total Residual Chlorine Level at C.W. Outfall No. 4 Serving Units L12 (September 2025)

Date of sampling	12/09	26/09
Total Residual Chlorine, mg/L	0.20	0.40