NAC445A.2168. Colorado Region: Muddy River at the Glendale Bridge.

The limits of this table apply to the body of water known as the Muddy River from the river source to the Glendale Bridge, except for the length of the river within the exterior borders of the Moapa Indian Reservation. This segment of the Muddy River is located in Clark County.

STANDARDS OF WATER QUALITY

Muddy River at the Glendale Bridge

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
Temperature °C -									*
Source Springs to Warm Springs Bridge				19≤T≤32
Warm Springs Bridge to Glendale Bridge				15≤T≤30
ΔTb	DT	= 0°C		ΔT	≤2°C
pH Units				S.V. DpH		6.5 - 9.0 ± 0.5 Max.	X	X	*	X	X	X	X	*
Dissolved Oxygen - mg/l				S.V.		≥ 5.0	X		*	X	X	X		X
Total Phosphorus (as P) - mg/l				A-Avg.		≤ 0.1			*	X	X	X
Nitrogen Species (as N) - mg/l	Total Nitrogen			Nitrate S.V. Nitrite S.V.		≤ 10 ≤ 1.0	X		X	X	X	*		X
	A-Avg. S.V.		≤ 1.3 ≤ 1.4
Total Ammonia (as N) - mg/l				c					*
Turbidity - NTU				d					*			X
Color - PCU				S.V. ≤75					X			*
Total Dissolved Solids - mg/l				e			X	X				*
Alkalinity (as CaCO3) - mg/l				< 25% change from natural conditions					*					X
E. coli - No./100 ml				A.G.M. S.V.		≤ 126 ≤ 410				*	*
Fecal Coliform - No./100 ml				S.V.		≤ 1,000	X	*			X	X		X
Fluoride (as total recoverable) - mg/l				S.V.		≤ 2.6	X	*

* = The most restrictive beneficial use.

X = Beneficial use.

^a     Refer to NAC 445A.122 and 445A.2142 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.

^e     The salinity standard for the Colorado River System is specified in NAC 445A.1233.

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