NAC445A.2154. Colorado Region: Inner Las Vegas Bay.

The limits of this table apply to the body of water known as Inner Las Vegas Bay, consisting of Lake Mead from the confluence of the Las Vegas Wash with Lake Mead to 1.2 miles into Las Vegas Bay. Inner Las Vegas Bay is located in Clark County.

STANDARDS OF WATER QUALITY

Inner Las Vegas Bay

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
Aquatic Life Species of Concern						Warm-water fishery.
Temperature ΔTb - °C	ΔT	= 0	ΔT	≤ 2				*
pH - SU	95% of S.V. samples ≤ 8.9		S.V.		6.5 - 9.0	X	X	*				X	*
Dissolved Oxygen - mg/l			S.V.	≥ 5.0		X		*		X			X
Nitrogen Species (as N) - mg/l	Total Inorganic Nitrogen 95% of S.V. samples ≤ 5.3		Nitrate S.V. Nitrite S.V.		≤ 90 ≤ 5	X		*					X
Total Ammonia (as N) - mg/l			c					*
Suspended Solids - mg/l			S.V.	≤ 25				*		X
Turbidity - NTU	d		S.V.	≤ 25				*		X
Total Dissolved Solids - mg/l	e		S.V.	≤ 3000		*	X
Fecal Coliform MF or MPN/100 ml			≤ 200/400f			X	X			X			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.

^c     The requirement for water quality with regard to the concentration of total ammonia is provided pursuant to the provisions of NAC 445A.118. Data must be collected at Station LWLVB 1.2. Station LWLVB 1.2 is located at the center of the channel at a distance of 1.2 miles into Las Vegas Bay from the confluence of the Las Vegas Wash with Lake Mead.

^d     Turbidity must not exceed that characteristic of natural conditions by more than 10 NTU.

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

^f     Any discharge from a point source into Las Vegas Wash must not exceed a log mean of 200 per 100 milliliters based on a minimum of not less than five samples taken over a 30-day period, nor may more than 10 percent of the total samples taken during any 30-day period exceed 400 per 100 milliliters.

Ê The Commission recognizes that, because of discharges of tributaries, localized violations of standards may occur in the Inner Las Vegas Bay.

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