Table 2. Average noise levels on various days, at different powerhouse (PH) turbine unit outlets (e.g., 6N is the north outlet of turbine unit 6 and 4N/5S is between turbine units 4 and 5, see Figure 1), and treatments on the powerhouse deck for each hydrophone (i.e., PH 1, PH 2, etc., see Table 1 for details).

Date	Elevation	Spill	PH Outflow	PH 1 Turbine	PH 1 NL (dB re 1 μPa)	PH 2,3 Turbine	PH 2 NL (dB re 1 μPa)	PH 3 NL (dB re 1 μPa)	PH 4,5 Turbine	PH 4 NL (dB re 1 μPa)	PH 5 NL (dB re 1 μPa)
10/19/2012	High	None	Typical	6N	107	6S	103	99	N/A	N/A	N/A
10/29/2012	High	None	Low	6N	106	5S	102	101	N/A	N/A	N/A
10/29/2012	High	Low	Low	6N	107	5S	102	100	N/A	N/A	N/A
11/5/2012	Low	Low	Low	6N	108	6S	105	102	N/A	N/A	N/A
11/6/2012	High	None	Typical	6S	106	6N/6S	105	105	N/A	N/A	N/A
11/6/2012	High	Low	Typical	6S	106	6N/6S	104	104	N/A	N/A	N/A
11/7/2012	Low	None	Low	6S	106	6N/6S	102	99	N/A	N/A	N/A
11/7/2012	High	None	Low	6S	106	6N/6S	101	98	N/A	N/A	N/A
11/7/2012	High	None	Typical	6S	106	6N/6S	102	98	N/A	N/A	N/A
11/7/2012	High	Low	Low	6S	106	6N/6S	103	101	N/A	N/A	N/A
11/7/2012	High	Low	Typical	6S	106	6N/6S	103	100	N/A	N/A	N/A
4/23/2013	High	Low	Low	2N	106	1N	102	101	N/A	N/A	N/A
5/2/2013	High	Low	Low	2N	106	1N	102	100	N/A	N/A	N/A
5/14/2013	High	High	High	N/A	N/A	N/A	N/A	N/A	6S	117	116
5/14/2013	High	Low	High	4N/5S	109	4S	104	104	6S	115	114
5/16/2013	High	Low	High	N/A	N/A	N/A	N/A	N/A	6S	113	111
5/18/2013	High	Low	Typical	3N	106	4S	102	101	4S	102	101