U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
RYE PATCH RESERVOIR
PERSHING CQim
NEVADA
EPA REGION IX
WORKING PAPER No, 809
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
RYE PATCH RESERVOIR
PERSHING COUMY
NEVADA
EPA REGION IX
WORKING PAPER No, 809
WITH THE COOPERATION OF THE
NEVADA ENVIRONMENTAL PROTECTION SERVICE
AND THE
NEVADA NATIONAL GUARD
SEPTEMBER, 1977
-------
REPORT ON RYE PATCH RESERVOIR
PERSHIN6 COUNTY, NEVADA
EPA REGION IX
by
National Eutrophlcation Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Corvallis Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 809
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
September 1977
-------
i
CONTENTS
Page
Foreword i i
List of Nevada Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 13
V. Literature Reviewed 17
VI. Appendices 18
-------
11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, and impact on selected freshwater lakes as a basis for
formulating comprehensive and coordinated national, regional, and
state management practices relating to point source discharge
reduction and nonpoint source pollution abatement in lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts
that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be
constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized
model can be transformed into an operational
representation of a lake, Its drainage basin, and
related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and
watershed data collected from the study lake and its drainage
basin 1s documented. The report is formatted to provide state
environmental agencies with specific information for basin
E Tanning [§303(e)j, water quality criteria/standards review
§303(c)], clean lakes [§314(a,b)], and water quality monitoring
§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
-------
111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic
condition are being made to advance the rationale and data
base for refinement of nutrient water quality criteria for
the Nation's freshwater lakes. Likewise, multivariate evaluations
for the relationships between land use, nutrient export, and
trophic condition, by lake class or use, are being developed
to assist in the formulation of planning guidelines and policies
by the U.S. Environmental Protection Agency and to augment
plans implementation by the States.
ACKNOWLEDGMENTS
The staff of the National Eutrophication Survey (Office
of Research and Development, U.S. Environmental Protection
Agency) expresses sincere appreciation to the Nevada State
Environmental Protection Service for professional involvement,
to the Nevada National Guard for conducting the tributary
sampling phase of the Survey, and to those Nevada wastewater
treatment plant operators who provided effluent samples and
flow data.
The staff of the Department of Conservation and Natural
Resources, Division of Environmental Protection, State Environmental
Protection Service provided invaluable lake documentation
and counsel during the Survey, reviewed the preliminary reports
and provided critiques most useful in the preparation of this
Working Paper Series.
Major General Floyd L. Edsall, the Adjutant General of
Nevada, and Project Officer Major Harold E. Roberts, who directed
the volunteer efforts of the Nevada National Guardsmen, are
also gratefully acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF NEVADA
LAKE NAME
Lake Mead
Lahontan Reservoir
Rye Patch Reservoir
Lake Tahoe
Topaz Reservoir
Upper Pahranagat Lake
Washoe Lake
Wildhorse Reservoir
Wilson Reservoir
Walker Lake
COUNTY
Clark (Mohave in Arizona)
Lyon, Churchill
Pershing
Washoe, Carson City,
Douglas (Placer,
El Dorado in CA)
Douglas (Mono in CA)
Lincoln
Washoe
Elko
Elko
Mineral
-------
RYE PATCH RESERVOIR
Tributary Sampling Site
* Lake Sampling Site
o 9 » is 20 Km
-------
REPORT ON RYE PATCH RESERVOIR, NEVADA
STORET NO. 3204
I. CONCLUSIONS
A. Trophic Condition:*
Survey data indicate that Rye Patch Reservoir is eutrophic,
i.e., nutrient rich and highly productive. Whether such nutrient
enrichment is to be considered beneficial or deleterious is
determined by its actual or potential impact upon designated
water uses of the lake.
Chlorophyll a_ values in the lake ranged from 1.5 ug/1 in
July to 20.6 yg/1 in November with a mean of 4.9 yg/1. The
potential for primary productivity as measured by algal assay
control yields was high in June and in portions of the lake
in November. Of the 10 Nevada lakes sampled in 1975, 5 had
higher median total phosphorus values (0.094 mg/1), 8 had
higher median inorganic nitrogen levels (0.050 mg/1) and 5
had higher median orthophosphorus values (0.039 mg/1) than
Rye Patch Reservoir.
Survey limnologists did not report any algal blooms or
macrophyte problems on their visits to the lake. However,
it was noted that this lake was highly turbid on all sampling
occasions and low Seechi disc visibility (range 0.2 - 1.5 m)
*See Appendix E.
-------
suggests primary productivity in the lake may be light limited.
B. Rate-Limiting Nutrient:
Algal assay results indicate that Rye Patch Reservoir was
limited by available nitrogen during the spring sampling (06/02/75) .
and by available phosphorus during the fall sampling (11/07/75).
The reservoir data suggest primary limitation by nitrogen at all
three sampling times.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources directly impacting Rye
Patch Reservoir during the sampling year. However, the Nevada
Environmental Protection Services (1976) notes that effluent
from individual sewage systems at Mill City, Imlay, and other
areas may leach into the Humboldt River. Also, the Winnemucca,
Hells, Elko and Carl in waste water treatment plants discharge
to the river, but since they are substantially further upstream
than 40 stream kilometers (25 miles) from the reservoir, their
nutrient contributions are not included in the loading calcu-
lations (pages 12 - 13) for the lake.
o
The present phosphorus loading of 1.18 g P/m'/yr is
three times that proposed by Vollenweider (1975) as a "eutrophic"
loading. Vollenweider's model is probably not applicable
to lakes in which epilimnetic light penetration is severely
reduced by the presence of suspended materials in the surface
-------
waters. Nevertheless, phosphorus levels in the lake are
excessively high and it is expected that the trophic con-
dition of Rye Patch Reservoir will continue to deteriorate if
the present loading rate is maintained.
2. Nonpoint sources -
The Humboldt River contributed 92.4% of the total phos-
phorus load to Rye Patch Reservoir during the sampling year
and Pitt-Taylor Diversion Canal contributed 4.8%. Nutrients
in the river are primarily a result of livestock watering,
irrigation return flows, mining, construction, and general
erosion of the watershed (Nevada Environmental Protection
Services, 1976). Some of this "nonpoint" phosphorus loading
of the Humboldt River to Rye Patch Reservoir, however, can
probably be attributed to the four upstream municipal facili-
ties discharging into the river. Additional study is needed
to determine what actual percentage of this "nonpoint" load
can be attributed to these distant dischargers.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by James B. Williams, Jr.
(personal communication). Tributary flow data were provided by
the Nevada District Office of the U.S. Geological Survey (USGS).
Outlet drainage area includes the lake surface area. Tributaries
A-2 and C-l are canals, and, as such, have no drainage areas;
nevertheless, the drainage area of the Humboldt River is recorded
as that of tributary A-2. Tributary B-l includes the drainage
area of the Pitt-Taylor Reservoirs. Mean hydraulic retention
time was obtained by dividing the lake volume by mean flow of
the outlet. Precipitation values are estimated by methods as
outlined in National Eutrophication Survey (NES) Working Paper
No. 175. A table of metric/English conversions is included as
Appendix A.
A. Lake Morphometry:
y
1. Surface area: 46.14 km.
2. Mean depth: 4.6 meters.
3. Maximum depth: 18.7 meters.
4. Volume: 210.926 x 106 m3.
5. Mean hydraulic retention time: 421 days (1.2 yrs)
-------
B. Tributaries and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage,, Mean Flow
Name area (km ) (m3/sec)
A-2 Humboldt River 40,663.0 6.61
B-l Pitt-Taylor Reservoir 142.4 0.06
C-l Pitt-Taylor Diversion Canal 0.0 0.45
Minor tributaries and
immediate drainage - 847.4 0.05
Total 41,652.8 7.17
2. Outlet - A-l Humboldt River 41,699.0 5.80
C. Precipitation:
1. Year of sampling: 20.1 cm.
2. Mean annual: 18.2 cm.
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III. LAKE WATER QUALITY SUMMARY
Rye Patch Reservoir was sampled three times during the open-
water season of 1975 by means of a pontoon-equipped Huey helicopter.
Each time, samples for physical and chemical parameters were col-
lected from nine stations (Stations 02, 06, 07 and 09 were sampled
twice and Stations 11, 12 and 13 were sampled only once) on the
lake and from one or more depths at each station (see map,' page v).
During the last two visits, depth-integrated samples were collected
from each station for chlorophyll a_ analysis and phytoplankton
identification and enumeration. During the first and last visits,
18.9-liter depth-integrated samples were composited for algal assays,
Maximum depths (expressed in meters) sampled are listed below:
Station Maximum
Number Depth
01 7.9
02 4.9
06 15.5
07 3.0
09 1.5
10 6.4
11 3.4
12 Surface
13 9.4
r
For a more detailed explanation of NES methods, see NES Working
Paper No. 175.
-------
The results obtained are presented in full in Appendix C
and are summarized in III-A for waters at the surface and at the
maximum depth for each site. Results of the phytoplankton counts
and chlorophyll a_ determinations are included in III-B. Results
of the limiting nutrient study are presented in III-C.
-------
CODE 3?<">4
6/
PHYSICAL AND CHEMICAL CHARACTERISTICS
( 7/11/7S )
MAX
S*>'i< DEPTH*1
DISSOLVED OXYGE*
O.-l.S M DEPTH
" 6 X 0 E P T H •» *
CONDUCTIVITY (*)>•
O.-l.S M DEPT*-
"AX DEPTH**
6
3
1 (MG/L)
3
?
«H0C)
6
3
1- . 0- 24.0
n.5- 15.5
•v .3- 9.fi
•'•.2- 9.8
500.- 748.
501.- 708.
18.8
13. b
8.3
9.5
570.
b4n.
n.O-
4.9-
o.O-
4.9-
0.0-
4.9-
1.5
7.6
0.9
7.6
1.5
7.6
7
5
7
5
7
5
20.8- 23.5
14.5- 23.5
5.0- 7.2
5.2- 7.6
770. -1348.
819. -1348.
22.5
19.7
6.8
6.4
895.
851.
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
1.5
15.5
1.5
15.5
1.5
15.5
17
9
16
9
17
9
6.4- 8.7
6.5- 8.7
8.8- 10.0
6.6- 10.0
708. -2069.
71ft. -2065.
7.0
7.0
9.4
9.4
737.
743.
0.0- 1.5
0.0- 14.6
0.0- 1.5
0.0- 14.6
0.0- 1.5
0.0- 14.6
iJH (STANDARD UMTS)
'i.-l .5 M r-EPTH
,,A< ->EOTW«»
TOTAL ALKAL INI TN
o.-i.s » OEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
DISSOLVED ORTHO
O.-l.S M DEPTH
VAX DEPTH**
k!0< + N03 (KG/I.)
~.-l.s v; n£PT>-i
MAX. OEPTr-**
AMMONIA IMG/LI
O.-l.S M riEPTH
MAX DEPTH**
«..IELOAHL N (MG /I
'i.-l.S " DEPTH
'-'.AX DEPTH**
4
?
' (M'.i/L)
6
3
6
3
P (MG/L)
6
?
6
3
f>
3
.)
6
3
°. -•; = NO. OF STTEC. SAMPLED ON THI«; DATE
-------
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
06/01/75
07/11/75
11/07/75
Dominant
Genera
1. Centric diatom
Other genera
Total
1.
2.
1.
2.
Cryptomonas
Nitzschia
Other genera
Total
Chroomonas?
Schroederia
3. Chlamydomonas
4. Oocystis
5. Pandorina
Other genera
Total
Algal
Units
Per ml
30
30
34
34
68
889
727
566
242
162
162
2,748
-------
10
2. Chlorophyll a^ -
Sampling Station Chlorophyll a_
Date Number (yg/1)
07/11/75 01 1.7
02
06
07 2.2
09 1.8
10 1.5
11
12 ' —
13
11/07/75 01 3.3
02 3.9
06 2.0
07 8.0
09 5.7
10 5.3
11 5.1
12 20.6
13 3.1
-------
11
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
Spike (mg/1)
Ortho P
Cone, (mg/1)
Inorganic N
Cone, (mg/1)
a. 06/02/75
Control
0.05 P
0.05 P + 1.0 N
1.00 N
b. 11/07/75
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Control
0.05 P
0.05 P + 1.0 N
1.00 N
0.100
0.150
0.150
0.100
Stations 01,
0.040
0.090
0.090
0.040
Stations 02,
0.025
0.075
0.075
0.025
Stations 07,
0.040
0.090
0.090
0.040
0.090
0.090
1.090
1.090
06, 13
0.055
0.055
1.055
1.055
10, 11
0.070
0.070
1.070
1.070
09, 12
0.095
0.095
1.095
1.095
Maximum Yield
(mg/1-dry wt.)
6.2
5.6
29.8
20.0
2.0
5.3
14.7
1.2
0.5
4.4
3.3
0.3
0.5
0.9
0.9
0.3
-------
12
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum*. indicate that the potential for primary productivity
in Rye Patch Reservoir was high during the June sampling '
(06/02/75) and at the Stations 01, 06, and 13 assay during the
November sampling (11/07/75), but moderate at the Stations 02,
07 and 09-12 assays on the latter date. In the June assay, the
addition of nitrogen alone and in combination with phosphorus
produced a significant increase in yield over that of the con-
trol, indicating nitrogen limitation. The addition of only
phosphorus did not increase growth beyond control yields in
this assay. In all the November assays, the addition of phos-
phorus alone and in combination with nitrogen resulted in a
significant increase in yield over that of the control, indi-
cating phosphorus limitation at this time.
The mean inorganic nitrogen to orthophosphorus (N/P) ratios
in the reservoir data were 2/1 or less on all three sampling
occasions suggesting primary limitation by nitrogen (a mean
N/P ratio of 14/1 or greater generally reflects phosphorus limi-
tation).
*For further information regarding the algal assay test procedure
and selection of test organisms, see U.S. EPA (1971).
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13
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Nevada National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (pagev), except for the high
runoff months of April, May and June when two samples were collected.
Sampling was begun in November 1974, and was completed in October
1975.
Through an interagency agreement, stream flow estimates for
the year of sampling and a "normalized" or average year were pro-
vided by the Nevada District Office of the USGS for the tributary
sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a USGS computer program for
calculating stream loadings. Nutrient loads indicated for tribu-
taries are those measured minus known point source loads, if any.
Nutrient loadings for unsampled "minor tributaries and imme-
diate drainage" ("ZZ" of USGS) were estimated by using the mean
anrTual concentrations in the Humboldt River and Pitt-Taylor
Diversion Canal at Stations A-2 and C-l and mean annual ZZ flow.
-------
14
A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 Humboldt River 50,350 92.4
C-l Pitt-Taylor Diversion
(Canal) 2,645 4.8
b. Minor tributaries and immediate
drainage (nonpoint load) - 695 1.3
c. Known municipal STP's - None
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 805 1.5
Total 54,495 100.0%
2. Outputs - A-l Humboldt River 27,770
3. Net annual P accumulation - 26,725
*Estimated (See NES Working Paper No. 175).
-------
15
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 Humboldt River 229,175 78.6
C-l Pitt-Taylor Diversion 10,425 3.6
(Canal)
b. Minor tributaries and immediate
drainage (nonpoint load) - 2,170 0.7
c. Known municipal STP's - None
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 49,815 17.1
Total 291,585 100.0%
2. Outputs - A-l Humboldt River 201,970
3. Net annual N accumulation - 89,615
*Estimated (See NES Working Paper No. 175).
-------
16
D. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tri butary (mg/1) (mg/1)
B-l Pitt-Taylor Reservoir 0.203 1.360
E. Yearly Loadings:
In the following table, the existing phosphorus annual
loading is compared to the relationship proposed by Vollenweider
(1975). Essentially, his "eutrophic" loading is that at which
the receiving waters would become eutrophic or remain eutrophic;
his "oligotrophic" loading is that which would result in the
receiving water remaining oligotrophic or becoming oligotrophic
if morphometry permitted. A "mesotrophic" loading would be
considered one between "eutrophic" and "oligotrophic".
Note that Vollenweider's model may not apply to lakes with
short hydraulic retention times or in which light penetration is
severely restricted by high concentrations of suspended solids
in the surface waters.
Total Yearly
Phosphorus Loading
(g/m2/yr)
Estimated loading for Rye Patch Reservoir 1.18
Vollenweider's "eutrophic" loading 0.40
Vollenweider's "oligotrophic" loading 0.20
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17
V. LITERATURE REVIEWED
Nevada Environmental Protection Services. 1976. Water Quality
Management Plan, Humboldt River Basin. Department of Human
Resources, Carson City, Nevada.
U.S. Environmental Protection Agency. 197.1. Algal Assay Procedure
Bottle Test. National Eutrophication Research Program, Corvallis,
Oregon.
U.S. Environmental Protection Agency. 1975. National Eutrophica-
tion Survey Methods 1973-1976. Working Paper No. 175, National
Environmental Research Center, Las Vegas, Nevada, and Pacific
Northwest Environmental Research Laboratory, Corvallis, Oregon.
Vollenweider, R. A. 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydrol. 37:53-84.
Williams, James B., Jr. 1974. Personal communication (lake
morphometry). Department of Human Resources, Carson City, Nevada.
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18
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.621*1 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10 = acre/feet
Square kilometers x 0.3861 - square miles
Cubic rneters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 - pounds
Kilograms/square kilometer x 5.711 - Ibs/squarc mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR NEVADA
1/21/77
LAKE CODE 3204
PATCH RESERVOIR
TOTAL DRAINAGE A-
41699. n
40663.0
40805.4
40663.0
893. 5
NORMALIZED FLOWS(CMS)
JAN
u.59
2.83
0.011
0.481
0.170
FEB
1.30
5.01
0.059
0.736
0.057
MAR
4.22
9.04
0.178
0.793
0.255
APR
10.25
11.84
0.093
0.708
0.057
MAY
15. an
14.95
0.096
0.680
0.014
JUN
11.64
15.55
0.170
0.765
0.028
JUL
12.88
12.40
0.085
0.481
0.0
AUG
6.17
2.94
0.011
0.142
0.0
SEP
4.02
1.19
0.0
0.085
0.0
OCT
0.62
0.96
0.0
0.085
0.0
NOV
0.57
1.42
0.011
0.198
0.0
DEC
1.19
2.12
0.0
o.?55
0.028
ME
5.
6.
0.0
0.4
0.0
SUMMARY
TOTAL DRAINAGE AREA OF LAKE = 41699.0
SUM OF SUB-DRAINAGE AREAS = 123024.8
NOTE: A2 AND Cl ARE CANALS. THEIR DRAINAGE AREA IS THAT OF THE 'HUMBOLDT RIVER.
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TOTAL FLOW IN =
TOTAL FLO* OUT =
85.99
69.26
TRIBUTARY
3204A1
MONTH
YEA*
MEAN FLOW DAY
FLO* DAY
FLOW DAY
FLOW
3204A2
11
12
1
2
3
4
5
6
7
8
9
in
11
12
1
2
3
4
S
6
7
8
9
10
74
74
75
75
75
75
75
75
75
75
75
75
74
'/«+
75
75
75
75
75
75
75
75
75
75
0.651
0.481
0.396
0.453
1.586
13.281
23.673
41.909
37.661
13.082
9.033
7.136
0.906
1.388
1.812
3.115
11.327
15.659
30.865
58.050
31.149
9.911
3.398
2.322
17
17
16
IB
2?
15
17
11
15
13
19
2?
17
17
16
18
22
15
17
11
15
13
19
2?
0.680
0.453
0.396
0.453
1.444
15.489 30
23.758 29
47.855 12
40.210
11.582
7.957
8.212
n.963
1.472
1.869
6.230
14.725
13.451 30
29.166 29
51.253 12
29.733
9.628
3.398
2.067
18.548
32.848
47.855
19.171
52.669
48.988
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LAKt CODE 3204
MEAN MONTHLY FLO'*S AND DAILY
fPIH MEAN FLO»
3204B1
TPIBUT4KY FLOW INFO»MATION FQR NEVADA
RESERVOIR
1/21/77
3204C1
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
74
74
7^.
75
75
75
7S
7S
75
75
75
75
74
74
75
75
7S
75
75
75
75
75
75
75
DAY
FLOW DAY
FLOW DAY
FLOW
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.614
1.133
0.0
0.0
0.0
o.ioe
0.633
1 .416
3.803
4.446
5.18?
3.908
3.662
1.303
0.651
0.085
17
17
IA
]»
??
IS
17
u
IS
13
19
3?
17
17
16
!*
?'
15
17
11
IS
13
10
23
0.0
0.0
0.0
0.0
0.0
0.0 30
0.0 29
0.0 12
1.416
1.133
0.0
0.0
0.0
0.340
0.595
1.529
2.860
4.304 30
4.644 29
3.964 12
2.492
1.246
0.425
0.057
0.0
0.0
0.0
4.814
4.474
3.964
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STQRET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
330401
40 35 20.0 118 18 48.0 3
RYE PATCH RESERVOIR
32027 NEVADA
/TYPA/AMBNT/LAKE
11EPALES 751216 04001002
0026 FEET DEPTH CLASS 00
DATE
FROM
TO
75/06/02
75/07/11
75/11/07
TIME
OF
DAY
13 30
13 30
13 30
13 30
13 30
15 00
15 00
15 00
15 00
14 10
14 10
14 10
14 10
DEPTH
FEET
0000
0003
0010
0016
0025
0000
0005
0015
0026
0000
0005
0015
0020
00010
WATER
TEMP
CENT
24.0
19.0
17.5
15.5
13.5
22.3
21.5
20.7
15.9
7.8
7.7
7.7
7.7
00300
DO
MG/L
8.3
9.8
11.3
9.2
6.8
7.2
8.4
6.2
9.2
9.4
9.4
9.2
00077
TRANSP Cf>
SECCHI FIELD
INCHES M]
10
24
94
TVY
MHO
520
500
480
480
500
895
869
919
851
708
737
713
716
00400
PH
SU
9.60
9.60
9.60
9.40
8.40
8.60
8.60
8.50
8.70
8.65
8.65
8.60
8.60
00410
T ALK
CAC03
MG/L
246
276
256
278
282
485
465
500
475
344
374
378
334
00610
NH3-N
TOTAL
MG/L
0.050
0.040
0.050
0.060
0.060
0.060
0.070
0.060
0.050
0.0?OK
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.800
0.600
0.500
0.400
0.500
1.000
0.800
0.700
0.800
0.400
0.400
0.400
0.500
006.10
N02&N03
N-TOTAL
MG/L
0.110
0.100
0.100
0.100
0.100
0.050
0.040
0.090
0.040
0.020K
0.020K
O.P20K
0.020K
00671
PHOS-DIS
ORTHO
MG/L P
0.083
0.088
0.082
0.077
0.078
0.072
0.067
0.106
0.067
0.033
0.032
0.034
0.033
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/06/02 13 30 0000
13 30 0003
13 30 0010
13 30 0016
13 30 0025
75/07/11 15 00 0000
15 00 0005
15 00 0015
15 00 0026
75/11/07 14 10 0000
14 10 0005
14 10 0015
i* 10 ooao
0665
S-TOT
/L P
0.157
0.137
0.118
0.122
0.233
0.112
0.116
0.154
0.112
0.066
0.065
0.078
0.065
32217
CHLRPHYL
A
UG/L
1.7
3.3
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 77/01/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320402
40 36 17.0 118 18 17.0 3
RYE PATCH RESERVOIR
32027 NEVADA
/TYPA/AMBNT/LAKE
DATE
FROM
TO
75/06/02
75/11/07
TIME DEPTH
OF
DAY FEET
14 30 0000
14 30 0003
14 30 0010
14 30 0016
11 10 0000
11 10 0005
11 10 0010
00010
*ATER
TEMP
CENT
22.0
15.0
14.6
13.5
7.8
7.7
7.7
00300 00077
DO TRANSP O
SECCHI FIELD
MG/L INCHES M]
6.8
9.8
10.6
9.8
9.4
9.4
9.4
43
11EPALES 751216 04001002
0016 FEET DEPTH CLASS 00
194
:TVY
1
IMHO
560
580
560
540
827
731
743
00400
PH
SU
9.20
9.40
9.20
9.00
8.65
8.65
8.65
00410
T ALK
CAC03
MG/L
282
258
248
262
342
382
322
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.050
0.060
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.800
0.500
0.500
0.500
0.600
0.600
0.500
00630
N02K.N03
N-TOTAL
MG/L
O.ftoO
0.090
0.100
0.0^0
0.020K
0.020K
0.020K
00671
PHOS-DIS
ORTHO
M«/L P
0.079
0.079
0.081
0.083
0.030
0.029
0.029
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/06/02 14 30 0000
14 30 0003
14 30 0010
14 30 0016
75/11/07 11 10 0000
11 10 0005
11 10 0010
0665
S-TOT
/L P
0.137
0.120
0.117
0.124
0.069
0.067
0.062
32217
CHLRPHYL
A
UG/L
3.9
00031
INCDT LT
RFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUTKOPHICATION SURVEY
EPA-LAS VEGAS
320406
40 28 17.0 118 13 03.0 3
RYE PATCH RESERVOIR
33037 NEVADA
/TYPA/AMBNT/LAKE
DATE
FROM
TO
75/07/11
75/11/07
TIME DEPTH
OF
DAY FEET
15 15 0000
15 15 0051
14 45 0000
14 45 0005
14 45 0015
14 45 0030
14 45 0048
00010
WATER
TEMP
CENT
22.5
14.5
8.7
a. 7
8.7
8.7
8.7
00300 00077
DO TRANSP C
SECCHI FIELD
MG/L INCHES N
7.2
7.6
8.8
8.8
B.6
8.6
30
11EPALES 751216 04001002
0055 FEET DEPTH CLASS 00
094
CTVY
D
OMHO
1006
842
734
728
739
716
727
00400
PH
SU
8.70
8.70
8.60
8.60
8.60
8.60
8.60
00410
T ALK
CAC03
MG/L
465
495
340
374
366
370
360
00610
NH3-N
TOTAL
MG/L
0.060
0.040
0.020K
0.020K
0.020K
0.020
0.020K
00625
TOT KJEL
N
MG/L
1.400
1.000
0.600
0.500
0.500
0.600
0.500
006 ^0
N02&N03
M-TOT&L
MG/L
0.030
0.0*0
0.020
O."40
0.030
0.030
0.030
00671
PMOS-DIS
CHTHO
M^/L P
0.096
0.081
0.035
0.036
0.036
0.037
0.035
DATE
FROM
TO
75/07/11
75/11/07
TIME DEPTH
OF
DAY FEET
15 15 0000
15 15 0051
14 45 0000
14 45 0005
14 45 0015
14 45 0030
14 45 0048
00665
PHOS-TOT
MG/L P
0.140
0.139
0.063
0.069
0.062
0.068
0.066
32217
CHLRPHYL
A
UG/L
2.0
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320407
40 41 09.0 118 18 06.0
RYE PATCH RESERVOIR
32027 NEVADA
/TYPA/AMBNT/LAKE
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/07/11 14 20 0000
14 20 0005
14 20 0010
75/11/07 10 15 0000
10 15 0005
10 15 0010
11EPALES 751216 04001002
0014 FEET DEPTH CLASS 00
00010
WATER
TEMP
CENT
22.6
20.8
19.7
6.8
6.8
6.7
00300
DO
MG/L
5.4
5.0
5.2
9.6
9.4
9.4
00077
TKANSP
<;ECCHI
INCHES
9
00094
CNDUCTVY
FIELD
MICROMHO
784
770
819
720
731
743
00400
PH
SU
8.50
8.40
8.40
8.60
8.60
8.60
00410
T ALK
CAC03
MG/L
445
500
485
348
366
342
00610
NH3-N
TOTAL
MG/L
0.090
0.070
0.080
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
1.500
0.800
0.800
0.400
0.400
0.400
00630
N02&N03
N-TOTAL
MG/L
0.060
o.o«o
0.060
0.020K
0.020K
0.020K
00671
PHOS-DIS
0»THO
MG/L P
0.046
0.048
0.060
0.033
0.040
0.039
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/07/11 14 20 0000
14 20 0005
14 20 0010
75/11/07 10 15 0000
10 15 0005
10 15 0010
0665
S-TOT
/L P
0.142
0.108
0.144
0.097
0.104
0.119
32217
CHLRPHYL
A
UG/L
2.2
8.0
00031
INCDT LT
RF.MNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
330409
40 39 03.0 118 16 36.0 3
RYE PATCH RESERVOIR
33027 NEVADA
/TVPA/AM8NT/LAKE
00010
DATE TIME DEPTH WATER
FROM OF TEMP
TO DAY FEET CENT
7S/07/11 14 40 0000
75/11/07 10 30 0000
10 30 0005
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/07/11 14 40 0000
75/11/07 10 30 0000
10 30 0005
11EPALES 751216 04001002
0015 FEET DEPTH CLASS 00
00300 00077
DO TRANSP C
>t.CCMl FIELD
MG/L INCHLS »
22.5
6.5
6.5
0665
S-TOT
/L P
0.114
0.103
0.094
6.4
9.8
9.6
32217
CHLRPHYL
A
UG/L
l.B
5.7
58
00031
INCDT LT
RFMNING
PFWCF.NT
094
CTVY
D
OMHO
1087
1414
1425
00400
PH
SU
8.60
8.60
8.60
00410
T ALK
CAC03
MG/L
425
354
316
00610
NH3-N
TOTAL
MG/L
0.040
0.020K
0.020K
00625
TOT KJEL
N
MG/L
1.000
0.500
0.600
00630
N02&N03
N-TOTAL
MG/L
0.030
0.020K
0.020K
00671
PHOS-DIS
OOTHO
MG/L P
0.076
0.035
0.036
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOHET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320410
40 37 02.0 118 16 44.0 3
RYE PATCH RESERVOIR
32027 NEVADA
/TYOA/AMBNT/LAKE
11EPALES 751216 04001002
0025 FEET DEPTH CLASS 00
DATE
FROM
TO
75/06/05
75/07/11
75/11/07
DATE
FROM
TO
75/06/05
75/07/11
75/11/07
TIME DEPTH
OF
DAY FEET
13 35 0000
13 35 0005
13 35 0021
14 50 0000
10 50 0000
10 50 0005
TIME DEPTH
OF
DAY FEET
13 35 0000
13 35 0005
13 35 0021
14 50 0000
10 50 0000
10 50 0005
00010
HATER
TEMP
CtNT
18.5
16.6
15.5
23.5
6.4
6.5
00665
PHOS-TOT
MG/L P
0.112
0.095
0.031
0.083
0.071
0.092
00300
00
MG/L
6.8
9.8
10.0
32217
CHLKPHYL
A
OG/L
1.5
5.3
00077
TKANSP
<;ECCHI
INCHES
42
42
00031
IMCDT LT
PF.MNING
PERCENT
00094
CNDUCTVY
FIELD
MICROMHO
748
723
708
1348
2069
2065
00400 00410
PH T ALK
CAC03
SU MG/L
264
292
44
8.80 440
8.60 314
8.65 308
00610
NH3-N
TOTAL
MG/L
0.120
0.070
0.040
0.020
0.020K
0.020K
00625
TOT KJEL
N
MG/L
1.000
0.600
0.600
0.700
0.600
0.600
00630 00671
N02J.N03 PHOS-OIS
N-TOTAL ORTHO
MG/L MO/L P
0.130
o.ioo
0.040
0.020K
0.020K
0.020K
0.084
0.070
0.006
0.060
0.019
0.019
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUTHOPHICATION SURVEY
EPA-LAS VEGAS
330411
40 38 57.0 118 30 23.0
RYE PATCH RESERVOIR
33037 NEVADA
/TfPA/AM8NT/LAKE
DATE
FROM
TO
75/11/07
DATE
FROM
TO
75/11/07
TIME DEPTH
OF
DAY FEET
10 35 0000
10 35 0005
10 35 0011
TIME DEPTH
OF
DAY FEET
10 35 0000
10 35 0005
10 35 0011
00010
WATER
TEMP
CENT
7.0
7.0
7.0
00665
PHOS-TOT
MG/L P
0.064
0.087
0.084
00300
DO
MG/L
9.4
9.6
9.6
32317
CHLRPHYL
A
UG/L
5.1
00077
TRANSP
<;ECCHI
INCHES
00031
INCDT LT
PEMNING
PERCENT
FIELD
11EPALES 760114 04001003
0015 FEET DEPTH CLASS 00
94
TVY
MHO
760
769
783
00400
PH
SU
6.60
8.65
8.60
00410
T ALK
CAC03
MG/L
368
334
386
00610
NH3-N
TOTAL
MG/L
0.030K
0.030K
00635
TOT KJEL
N
MG/L
0.400
0.400
0.600
00630
N02J.N03
N-TOTAL
MG/L
0.030K
0.030K
0.030K
00671
PHOS-DIS
ORTHO
MG/L P
0.036
0.037
0.039
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STG^ET RETRIEVAL DATE 77/01/26
M4TL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320413
40 40 50.0 118 14 43.0 3
RYE PATCH RESERVOIR
32087 NEVADA
00010
TIME DEPTH WATER
OF TE*P
DAY FEET CENT
DATE
F">OM
TO
7^/11/07 10 00 0000
11EPALES 760114 04001002
0005 FEET DEPTH CLASS 00
6.7
00300 00077 00094 00400 00410 00610 00625 00630 00671
DO TftANSP CNOUCTVY PH T ALK NH3-N TOT KJEL N02S.N03 PHOS-DIS
"5ECCHI FIELD CAC03 TOTAL N N-TOTAL ORTHO
MG/L INCHES MICROMHO SU MG/L MG/L MG/L MG/L MG/L P
9.0 737 8.55
334 0.020K 0.400 0.020K 0.034
00665 32217 00031
DATE TIME DEPTH PHOS-TOT CHLRPHVL INCDT LT
F«OM OF A REMNING
TO DAY FEET MG/L P UG/L PERCENT
75/11/07 10 00 0000
0.066
20.6
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320413
40 32 28.0 118 16 20.0
RYE PATCH RESERVOIR
32027 NEVADA
/TYP4/AMBNT/LAKE
DATE
FBOM
TO
76/11/07
DATE
FROM
TO
75/11/07
TIME DEPTH
OF
DAY FEET
14 30 0000
14 30 0005
14 30 0015
14 30 0031
TIME DEPTH
OF
DAY FEET
14 30 0000
14 30 0005
14 30 0015
14 30 0031
00010
WATER
TEMP
CENT
8.3
8.3
8.3
8.1
00665
PHOS-TOT
MG/L P
0.084
0.066
0.063
0.093
00300
DO
MG/L
9.4
8.8
8.8
9.0
32217
CHLRPHYL
A
UG/L
3.1
00077
TRANSP
SECCHI
INCHES
00031
INCDT LT
REMNING
PERCENT
FIELD
11EPALES 760115 04001002
0035 FEET DEPTH CLASS 00
94
TVY
MHO
721
722
722
725
00400
PH
SU
8.60
8.60
8.60
8.60
00410
T ALK
CAC03
MG/L
364
344
350
364
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.600
0.500
0.500
0.500
00630
N02&N03
N-TOTAL
MG/L
0.020
0.020
0.020
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.040
0.035
0.033
0.036
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
)ATE 77/01/^2
-Ml •' uT -•.:->•- 1C.'. r
~ - a - i 4 <; / r ' - 4 5
3204A1
40 2e 10.0 lie id 30.0 4
HUMBOLDT RIVFR
32 15 OWEAMA
0/RYE PATCH RESERVOIR
3ELO RYE PATCH 0AM 1.? M ft JCT * OS 40
11EPALES 04001004
0000 FEET OEMTn CLASS 00
J ••• ' (•
1 'I
/"/I 1/17
C<*/1?/17
7 -i / •"' 1 / 1 ft
7^/f.?/ IM
/-,/.-. < / £ ?
T-/ , <. / 1 ^
7- /••'<*/ iO
/ r / 1-1/17
7 ^ / :' S / £ •)
/'- '1-3/11
7&- /r-./l^
/b/!i 7/1S
75/08/13
75/09/19
75/1(1/22
TIN
•i,
!'.'
11
1 1
10
10
1*
15
Ov
17
10
r?
16
16
13
12
00630 00625
'£ DEPTH N025.N03 TOT KJEL
N-TOTAL N
• frET
IS
no
On
4S
JO
11".
Oil
00
^5
1°)
(><<
15
on
30
30
MG/L
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
.040
.272
.083
.070
.030
. 02^
.00*
.040
.04S
.025
.500
.020
.010
.005
.00^
MG/L
0.
1.
1.
0.
a.
1.
0.
0.
0.
1.
1.
1.
0.
1.
0.
400
OOi)
600
500
450
800
7 Of:
350
650
150
050
250
900
100
700
004- n 00671 00665
N-r3-:« PnOS-i)IS OHOS-TOT
TI'TiSL O^THfj
?r-
0
p
C
u
0
0
l>
0
n
(1
0
0
0
0
(/ ,
.('33
.!'55
. <)<»u
.'HO
. 0 1 b
.010
.030
. !) 1 0
. "3 4
.Old
. !)?5
.035
.015
.03U
M1V
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
L *
.135
.040
.0^0
.040
.035
.030
.Of5
.070
.100
.060
.250
.065
.090
.035
.025
MG/L P
0.040
0.060
0.060
0.070
0.085
0.090
0.340
0.080
0.120
0.280
0.260
0.310
0.340
0.100
0.100
-------
DATE
ION
. P 4 - LAS V t G A 3
Ottt
OQ630
TI"t r.EPTH N0?!v'.l03
-»ON! ot- N-TOTAL
TO UA-- Fr£T
/"/11/17
74/12/17
7=>/0?/18
75/06/1?
75/1-1 7/1 5
75/08/13
75/09/19
75/io/aa
l£? 00
la is
1? 30
12 30
11 30
16 00
16 30
10 30
!=» 15
I? 05
1H 30
Ib 45
17 30
14 20
13 00
0 . 0 0 ^
0.00-i
0.064
0.330
(i . 1 3 0
0.09n
0.00^
0.01 =
0.020
0.195
U.O] S
0.015
0.005
0.005
0.005
KJtL
'l. ..U'O
0.575
T.vOO
I . * 0 0
1 . ? 0 0
1.100
1 . .-i I) 0
1.150
2.100
1.P50
1.350
O.HOO
0.600
3204A2
40 41 30.0 lift 1? 15.0 4
HUMBOLUT PIVEH
32 15 IMU6Y
T/kYE PATCH XESEKVOIR
BNK SAMP ENO OF OrtT HO 4 MI
11EPALES 04001004
0000 FEET OEPTn CLASS 00
OF IMLAY
00610
IH3-IN
OTAL
N>G/L
0.015
0.0?b>
0.016
0.070
0.070
0.030
0.017
0.027
0.035
n. 190
0.280
0.025
0.032
0.015
0.010
00671
PHOS-OIS
O*?THO
MG/L P
0.100
0.040
0.062
0.210
0.135
0.105
0.085
0.095
0.210
0.065
0.170
0.065
0.090
0.035
0.025
00665
PHOS-TOT
MG/L P
0.120
0.090
0.107
2.200
0.720
0.070
0.350
0.430
0.420
0.280
0.310
0.300
0.375
0.110
0.080
-------
S T 0 i r T - - . - I E V A L, *
\*TL -:UT-" .'i-ic^rin
Ff- 4- : A~ V • l-i?
/T Y>-( 3 " /ST- f A..
(jflTt I t l'f_ OtPl
Krtrv-i iF
Ti.' • ' •> Ff-fcJ
/I 7 ! < 00
I J 45
i 1 40
': -• ~\ •"•
<• ] ' 0^
7 1 : 0'>
4 1-1 4 D
1 j .? 1 ^
.' i H 0n
/S/'j f/lr I •« T2
J204C1
40 40 05.0 11-. 11 55. n
PITT TAYLOK OIV CAf-iAL
32 15 IMLAV
r/vre PATCH nE.h>E*voiR
S£C WO B«DG 3 "I Mw OF
lltf^LtS 04001004
oooo reeT OE^TH CLASS no
150292
0-Jf>30
?s"03
T.'.TftL
"u/L
0.001
0,07?
0.345
r. . 1 3S
0.090
0.00^
0.020
(.'.010
0.020
;> .uin
1.270
0.005
00625
TOT KJEL
N
MG/L
0.500
0.700
4.300
1.300
1.450
0.750
1.100
1.450
1.050
l.DOO
0.950
1.000
00610
NH3-N
TOTAL
MG/L
0 . 0 10
0.016
0.07b
0.02U
O.OlU
0 . 0 1 <->
O.OlU
O.OTi:
O.Oltj
0.03d
0.010
0.02U
00671
-HOS-OIS
o-nHo
M.5/L f
0.035
0.0*5
0.240
0.135
0. 105
0.220
0.095
0.180
0.060
O.OHO
0.075
0.090
00*65
PHOS-TOT
MG/L t-
0.120
0.150
2.000
0.690
0.360
0.440
0.440
0.300
0.170
0.320
0.350
-------
.ft S
T^r-.v/ai. i/^TE
'-.- I •;".;.! it'-- V
i c •'.- " S
72/U1/2?
3204BI
40 36 15.0 118 17 50.0 *
PITT TAYLOR RESERVOIR
3? 7.5 RY PTCH RS S
T/rtYE PATCH RESEKVOIR 150291
BELO PITT TAYLOR DAM 3 MI » OF HuMBOLT
11EPALES 04001004
0000 FEET DEPTH CLASS 00
0 i T r T I v f.
f * o V .-. r
?"/!!/!7 -r ,-5
/«./!?/17 1 i; ^5
>-/'!l/l<> 10 JO
'5/'•-?/l*s 11 30
V s / •-. * /1 s IT n r;
>-./;.•••/30 15 ~'i
(' 5 / f) T) / 1 7 09 3 0
7 s / '"• n / 2 v 14 l-i
7-/i:~/ll P9 ^A
""-/Co/1? 19 .jn
75/08/13 18 30
75/09/19 13 on
75/10/22 12 on
00630
N02«,N03 TOT KjtL
,N-TOTAL '-'
Mii/L ^fi/l.
0.003
0 . 0?4
0.024
0.005
0.015
0.005
0.005
0.430
0.015
0.030
0.01*
0.010
0.005
0.005
a . .- n .1
i. t o o
1.1 fiO
0. 750
0 . 7 i> 0
1 . '-I 0 0
O.-OO
1 . T 5 0
11. ^ 0 0
1.3UU
1.300
1.600
0.600
-.••us
0.032
0 . 0 2 0
••1.025
0.015
ii. "15
(i. 0 "< U
0 . 0 3 0
0.030
0.120
0.005
00671
PHOS-DIS
OSTHQ
=-:«/L f
0.020
0.030
0.020
0.030
0.020
0.065
n.OHS
0. 105
0.080
0.065
O.?40
0.065
0.005
0.040
0.025
00665
PHOS-TOT
MG/L P
0.200
O.OflO
0.105
0.110
0.240
0.090
0.350
0.190
0.280
0.300
0.310
0.390
0.110
0.090
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF NEVADA
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Nevada lakes sampled are
presented to allow direct comparison of the ranking, by parameter,
of each lake relative to the others. Median total phosphorus, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll ^values are expressed in yg/1. To
maintain consistent rank order with the preceding parameters, the
mean Secchi disc depth, in inches, is subtracted from 500. Similarly,
minimum dissolved oxygen values are subtracted from 15 to create
table entries.
-------
PERCEMT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE. NAME.
3201 LAKE MEAD
3202 LAHONTAN RESERVOIR
3204 RYE PATCH RESERVOIR'
3205 LAKE TAHOE
3206 TOPAZ RESERVOIR
3207 UPPER PAHRANAGAT LAKE
3208 WASHOE LAKE
32C9 WILD HORSE RESERVOIR
3210 WILSON RESERVOIR
3211 WALKER LAKE
MEDIAN
TOTAL P
89 (
22 (
56 (
100 (
67 (
33 (
11 (
44 (
73 (
0 (
8)
2)
5)
9)
6)
3)
1)
4)
7)
0)
MEDIAN
I.NQRG M
11 (
0 (
89 (
100 (
33 (
56 (
44 (
22 t
67 (
78 (
1)
0)
8)
9)
3)
5)
4)
2)
6)
7)
500-
MEAM SEC
78 (
22 t
44 (
100 (
67 (
33 (
0 (
11 (
89 (
56 (
7)
2)
4)
9)
6)
3)
0)
1)
8)
5)
MEAN
CHL'ORA
88 (
63 C
50 (
100 (
38 (
—
13 (
0 (
25 (
75 (
7)
5)
4)
3)
3)
1)
0)
2)
6)
15-
MIN DO
39 (
56 (
78 (
67 (
17 (
89 (
100 (
17 C
39 (
0 (
3)
5)
7)
6)
1)
8)
9)
1)
3)
0)
MEDIAN
DISS ORTHO P
89 (
22 {
55 (
100 (
44 (
67 (
11 (
33 (
78 (
0 (
8)
2)
5)
9)
4)
6)
1)
3)
7)
0)
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
3201 LAKE MEAD
3202 LAHONTAN RESERVOIR -
3204 RYE PATCH RESERVOIR
3205 LAKE TAHOE
3206 TOPAZ RESERVOIR '
3207 UPPER PAHRANGAT LAKE
320S WASHOE LAKE
3209 WILD HORSE RESERVOIR
3210 WILSON RESERVOIR
3211 WALKER LAKE
MEDIAN
TOTAL P
0.016
0.198
0.094
0.005
0.057
0.173
0.403
0.114
0.049
0.602
MEDIAN
INORG N
0.340
0.350
0.050
0.040
0.165
0.125
0.130
0.320
0.120
0.080
500-
ME/SN SEC
266.565
472.083
467.750
-3.269
376.000
470.000
494.555
489.400
197.333
405.333
MEAN
CHLORA
3.111
4.608
4.938
0.571
7.517
—
11.633
75.530
10.033
3.422
15-
MIN DO
11.400
10.400
10.000
10.200
14.600
8.600
7.200
14.600
11.400
15.000
MEDIAN
DISS ORTHO P
0.005
0.14S •
0.039
0.003
0.041
0.026
0.268
0.065
0.016
0.574
------- |