NAC445A.1694. Truckee Region: Truckee River at the Pyramid Lake Paiute Reservation.

The limits of this table apply to the body of water known as the Truckee River from Derby Dam to the exterior border of the Pyramid Lake Paiute Reservation. This segment of the Truckee River is located in Storey and Washoe Counties.

STANDARDS OF WATER QUALITY

Truckee River at the Pyramid Lake Paiute Reservation

PARAMETER	REQUIREMENTS TO MAINTAIN EXISTING HIGHER QUALITY		WATER QUALITY STANDARDS FOR BENEFICIAL USES			Beneficial Usea
						Livestock	Irrigation	Aquatic	Contact	Noncontact	Municipal	Industrial	Wildlife	Aesthetic	Enhance	Marsh
Beneficial Uses						X	X	X	X	X	X	X	X
Aquatic Life Species of Concern						Early spawning Lahontan cutthroat trout and their incubation, larvae, juveniles and migration, from May through June, depending on hydrologic conditions.
Temperature - °C ΔTb - °C	DT	= 0	S.V. Nov-Mar S.V. Apr-Jun S.V. Jul-Oct ΔT		≤ 13c ≤ 14c ≤ 25d ≤ 2			*	X
pH - SU	S.V.	7.1 - 8.6	S.V. ∆pH		6.5 - 9.0 ± 0.5	X	X	X	*		X	X	*
Dissolved Oxygen - mg/l			S.V. Nov-Jun S.V. July-Oct		≥ 6.0 ≥ 5.0	X		*	X	X	X		X
Total Phosphates (as P) - mg/l			A-Avg.		≤ 0.05			*	*	X	X
Nitrogen Species (as N) - mg/l			Total N A-Avg. Total N S.V. Nitrate S.V. Nitrite S.V.		≤ 0.75 ≤ 1.2 ≤ 2.0 ≤ 0.04			*	*	X	X
Total Ammonia (as N) - mg/l			e					*
Suspended Solids - mg/l	A-Avg.	≤ 25.0	S.V.		≤ 50			*
Turbidity - NTU			S.V.		≤ 10			*			X
Color - PCU	f		S.V.		≤ 75						*
Total Dissolved Solids - mg/l	A-Avg. S.V.	≤ 245.0 ≤ 310.0	A-Avg.		≤ 500	X	X				*
Chloride - mg/l	A-Avg. S.V.	≤ 20.0 ≤ 28.0	S.V.		≤ 250	X	X				*		X
Sulfate - mg/l	A-Avg. S.V.	≤ 39.0 ≤ 46.0	S.V.		≤ 250						*
Sodium - SAR	A-Avg. S.V.	≤ 1.5 ≤ 2.0	A-Avg.		≤ 8		*				X
Alkalinity (as CaCO3) - mg/l			< 25% change from natural conditions					*					X
E. coli - No./100 ml			A.G.M. S.V.	≤ 126 ≤ 410					*	X
Fecal Coliform - No./100 ml	A.G.M. S.V.	≤ 50 ≤ 250	S.V.	≤ 1,000		X	*			X	X		X

* = The most restrictive beneficial use.

X = Beneficial use.

^a     Refer to NAC 445A.122 and 445A.1622 for beneficial use terminology.

^b     Maximum allowable increase in temperature above water temperature at the boundary of an approved mixing zone, but the increase must not cause a violation of the single value standard.

^c     When flows are adequate to induce spawning runs of cui-ui and Lahontan cutthroat trout, the standard is 13°C from November through March and 14°C from April through June.

^d     The desired temperature for the protection of juvenile Lahontan cutthroat trout is 21°C, even though that temperature is not attainable at all times.

^e     The ambient water quality criteria for ammonia are specified in NAC 445A.118.

^f     Increase in color must not be more than 10 PCU above natural conditions.

     (Added to NAC by Environmental Comm’n by R160-06, eff. 8-26-2008; A by R131-12, 12-20-2012; R093-13, 12-23-2013)