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Nevada Administrative Code (Last Updated: January 6, 2015) |
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Chapter445A Water Controls |
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WATER POLLUTION CONTROL |
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Standards for Water Quality |
NAC445A.1888. Walker Region: Topaz Lake.
- The limits of this table apply to the body of water known as Topaz Lake at various points in Topaz Lake. Topaz Lake is located in Douglas County.
STANDARDS OF WATER QUALITY
Topaz Lake
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
Rainbow trout, cutthroat trout, brown trout, kokanee salmon and silver salmon.
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-Octd
≥ 6.0
≥ 5.0
X
*
X
X
X
X
Total Phosphates
(as P) - mg/l
A-Avg.
S.V.
≤ 0.05
≤ 0.10
*
*
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
A-Avg.
S.V.
≤ 6.0
≤ 9.0
S.V.
≤ 25
*
Turbidity - NTU
A-Avg.
S.V.
≤ 3.0
≤ 5.0
e
*
X
Color - PCU
S.V.
≤ 21
S.V.
≤ 75
X
*
Total Dissolved
Solids - mg/l
A-Avg.
S.V.
≤ 105
≤ 120
A-Avg.
≤ 500
X
X
*
Chloride - mg/l
A-Avg.
S.V.
≤ 7
≤ 10
S.V.
≤ 250
X
X
*
X
Sulfate - mg/l
S.V.
≤ 25
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
≤ 235
*
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 The dissolved oxygen standard from June to October applies only to the epilimnion.
e 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)