NAC445A.1892. Walker Region: Walker River, West Fork near Wellington.

The limits of this table apply to the body of water known as the West Fork of the Walker River from the California-Nevada state line to near Wellington. This segment of the West Fork of the Walker River is located in Douglas and Lyon Counties.

STANDARDS OF WATER QUALITY

Walker River, West Fork near Wellington

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						Mountain whitefish, rainbow trout and brown trout.
Temperature - °C ΔTb - °C	ΔT	= 0	S.V. Nov-Apr S.V. May-Jun S.V. Jul-Oct DT		≤ 13 ≤ 17 ≤ 23 ≤ 2			*	X
pH - SU			S.V. ∆pH		6.5 - 9.0 ± 0.5	X	X	*	*		X	X	X
Dissolved Oxygen - mg/l			S.V. Nov-May S.V. Jun-Oct		≥ 6.0 ≥ 5.0	X		*	X	X	X		X
Total Phosphates (as P) - mg/l	A-Avg. S.V.	≤ 0.07 ≤ 0.10	A-Avg.		≤ 0.1			*	*	X	X
Nitrogen Species (as N) - mg/l	Total Nitrogen		Nitrate S.V. Nitrite S.V.		≤ 10 ≤ 0.06	X		*	X	X	*		X
	A-Avg. S.V.	≤ 0.6 ≤ 1.0
Total Ammonia (as N) - mg/l			c					*
Suspended Solids - mg/l			S.V.		≤ 80			*
Turbidity - NTU			d					*			X
Color - PCU			S.V.		≤ 75			X			*
Total Dissolved Solids - mg/l	A-Avg. S.V.	≤ 175 ≤ 260	A-Avg.		≤ 500	X	X				*
Chloride - mg/l	A-Avg. S.V.	≤ 16 ≤ 30	S.V.		≤ 250	X	X				*		X
Sulfate - mg/l			S.V.		≤ 250						*
Sodium - SAR			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

* = The most restrictive beneficial use.

X = Beneficial use.

^a     Refer to NAC 445A.122 and 445A.1882 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     The ambient water quality criteria for ammonia are specified in NAC 445A.118.

^d     Increase in turbidity must not be more than 10 NTU above natural conditions.

     (Added to NAC by Environmental Comm’n by R160-06, eff. 8-26-2008)