Nevada Administrative Code (Last Updated: January 6, 2015) |
Chapter445A Water Controls |
WATER POLLUTION CONTROL |
Standards for Water Quality |
NAC445A.1692. Truckee Region: Truckee River at Derby Dam.
- The limits of this table apply to the body of water known as the Truckee River from the Lockwood Bridge to Derby Dam. This segment of the Truckee River is located in Storey and Washoe Counties.
STANDARDS OF WATER QUALITY
Truckee River at Derby Dam
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
Juvenile and adult rainbow trout and brown trout. However, the species which are sensitive to temperature are expected to seek a cooler microhabitat during July and August.
Temperature - °C
ΔTb - °C
DT
= 0
S.V. Nov-Mar
S.V. Apr
S.V. May
S.V. Jun-Oct
ΔT
≤ 13
≤ 21c
≤ 22c,d
≤ 23c,d
≤ 2
*
X
pH - SU
S.V.
7.0 - 8.6
S.V.
∆pH
6.5 - 9.0
± 0.5
X
X
X
*
X
X
*
Dissolved
Oxygen - mg/l
S.V. Nov-Mar
S.V. Apr-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.
S.V.
≤ 24.0
≤ 40.0
S.V.
≤ 50
*
Turbidity - NTU
A-Avg.
≤ 8.0
S.V.
≤ 10
*
X
Color - PCU
f
S.V.
≤ 75
*
Total Dissolved
Solids - mg/l
A-Avg.
S.V.
≤ 215.0
≤ 265.0
A-Avg.
≤ 500
X
X
*
Chloride - mg/l
A-Avg.
S.V.
≤ 21.0
≤ 30.0
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.
≤ 80.0
≤ 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 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)