Table 5. Number of days acute ammonia toxicity was greater than the criteria (and average amount greater than the criteria) at selected Oregon Department of Environmental Quality compliance locations for scenario 3 under the base case and Total Maximum Daily Load scenarios, Klamath River, Oregon, for years 2006–09.


[2007 runs were bracketed by also using total inorganic carbon calculated with pH during low-bloom conditions (leftmost values when a range is given) for the Link River, Lost River Diversion Channel, and Klamath Straits Drain inputs. Abbreviations: TMDL, total maximum daily load; segment, model segment; N, nitrogen; WWTP, wastewater treatment plant; mg/L, milligram per liter]


Scenario		Days greater than acute ammonia toxicity criteria (and average greater than the criteria, as ammonia, in mg/L N)
		Klamath River at WWTP inflows (segments 4, 8)	Klamath River at Lost River Diversion Channel inflow	Klamath River at Miller Island	Klamath River at Klamath Straits Drain inflow	Klamath River at Keno
		Segment 8	Segment 19	Segment 38	Segment 69	Segment 95
2006
3(1a)	Base case (current conditions)	0	2 (0.03)	14 (0.06)	8 (0.08)	1 (0.05)
3(1b)	Sources at TMDL allocations	1 (0.01)	2 (0.03)	14 (0.06)	8 (0.07)	2 (0.04)
3(2a)	Link River at TMDL target	1 (0.01)	0	0	0	0
3(2b)	Link River and sources at TMDL	0	0	0	0	0
2007
3(1a)	Base case (current conditions)	6 (0.04)	13 (0.13)	18 (0.24)	18 (0.31)	19 (0.32)
3(1b)	Sources at TMDL allocations	6 (0.04)	13 (0.13)	18 (0.24)	18 (0.31)	19 (0.32)
3(2a)	Link River at TMDL target	0	0	0–7 (0.00–0.02)	0–11 (0.00–0.08)	0–5 (0.00–0.03)
3(2b)	Link River and sources at TMDL	0	0	0–7 (0.00–0.02)	0–10 (0.00–0.08)	0–2 (0.00–0.03)
2008
3(1a)	Base case (current conditions)	4 (0.02)	20 (0.07)	27 (0.14)	16 (0.13)	1 (0.08)
3(1b)	Sources at TMDL allocations	4 (0.02)	20 (0.07)	26 (0.14)	16 (0.13)	1 (0.08)
3(2a)	Link River at TMDL target	0	0	5 (0.01)	17 (0.04)	4 (0.01)
3(2b)	Link River and sources at TMDL	0	0	4 (0.01)	12 (0.03)	0
2009
3(1a)	Base case (current conditions)	0	6 (0.01)	4 (0.02)	1 (0.02)	0
3(1b)	Sources at TMDL allocations	0	6 (0.01)	4 (0.02)	1 (0.02)	0
3(2a)	Link River at TMDL target	0	0	0	8 (0.01)	0
3(2b)	Link River and sources at TMDL	0	0	0	6 (0.01)	0

First posted July 24, 2013