U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKETAHOE
CARSON CITY, DOUGLAS AND
WASHOE COUNTIES, NEVADA
EL DORADO AND
PLACER COUNTIES, CALIFORNIA
EPA REGION IX
WORKING PAPER No, 810
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
R inn1
LL WUi
THE COOPERATION OF THE
ENVIRONMENTAL PROTECTION SERVICE
tm THE
NEVADA NATIONAL GUARD
SEPTEMBER^ 1977
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REPORT ON LAKE TAHOE
CARSON CITY, DOUGLAS AND WASHOE COUNTIES, NEVADA
EL DORADO AND PLACER COUNTIES, CALIFORNIA
EPA REGION IX
by
National Eutrophication Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Corvallls Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 810
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
September 1977
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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 6
III. Lake Water Quality Summary 8
IV. Nutrient Loadings 18
V. Literature Reviewed 23
VI. Appendices 25
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11
FOREWORD
The National Eutrophicatlon Survey was Initiated 1n 1972 1n
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 is documented. The report is formatted to provide state
environmental agencies with specific information for basin
plannlna [§303(e)L water quality criteria/standards review
[§303(c)L 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.
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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, the California State Water
Resources Control Board and the California Regional Water Quality
Control Board for professional involvement, to the Nevada and
California National Guards for conducting the tributary sampling
phase of the Survey, and to those Nevada and California
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, Nevada
Environmental Protection Service, and the staffs of the Division of
Planning and Research of the California Water Resources Control
Board and the Regional Water Quality Control Board, 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, and
Major General Glen C. Ames, the Adjutant General of California, and
Project Officer Second Lieutenant Terry L. Barrie, who directed
the volunteer efforts of the California 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
E]ko
Elko
Mineral
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LAKE TAHOE
{^} Tributary Sampling Site
X Lake Sampling Site
Drainage Area Boundary
If Kjtl
5
Scale
wMi
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REPORT ON LAKE TAHOE, NEVADA
STORE! NO. 3205
I. CONCLUSIONS
A. Trophic Condition:*
Survey data indicate that Lake Tahoe is oligotrophic.
Chlorophyll a^ values in the lake ranged from 0.2 yg/1 to
3.0 yg/1 with a mean of 0.6 yg/1. Potential for primary
productivity as measured by algal assay control yields was
low and Secchi disc visibility was excellent. Of the 10
Nevada lakes sampled in 1975, all had higher median total
phosphorus values (0.005 mg/1), all had greater median
inorganic nitrogen levels (0.040 mg/1) and all had higher
median orthophosphorus values (0.003 mg/1) than Lake Tahoe.
Survey limnologists noted submerged vegetation near
the shoreline of developed areas. Goldman (1974) reports
that periphyton growth has become abundant around the entire
edge of the lake during the past decade. His study also
demonstrates a 25.6% increase in planktonic primary pro-
ductivity throughout the lake from 1968-1971.
*See Appendix E.
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B. Rate-Limiting Nutrient:
The algal assay results indicate that Lake Tahoe was limited
by available phosphorus. The lake data suggest primary limitation
by nitrogen in the spring and summer and phosphorus limitation in
the fall. Other studies (Lake Tahoe Area Council, 1971; Goldman,
1974) further indicate primary limitation by nitrogen in Lake
Tahoe.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources impacting Lake Tahoe
during the sampling year. The Federal Water Pollution Control
Act of 1972 prohibits point source discharge to the lake ex-
capt by special permit. Since that time, all domestic waste-
water is treated in the basin and then transported out (Dugan
and McGauhey, 1974). Wendell McCurry (personal communication)
reports that a few septic tanks still remain on the Nevada
side of the lake. However, since the exact number of homes
using septic tanks is not known, nutrient contributions from
this source were not included in determination of the lake
nutrient budget (pages 18-19).
2
The present phosphorus loading of 0.04 g P/m /yr is less
than that proposed by Vollenweider (1975) as "oligotrophic"
for a lake of such volume and hydraulic retention time.
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Lake Tahoe is renowned for the purity of its waters which are
rivaled only by Crater Lake in Oregon and Lake Baikal in the
Soviet Union. Consequently, much attention has been directed
toward eutrophication processes acting on the lake. Since
the threat of point source nutrient contributions has been
removed, nonpoint sources are being carefully examined as to
their effect on lake water quality.
2. Nonpoint sources -
Gaged tributaries contributed 25.2% of the total phosphorus
load to Lake Tahoe during the sampling year and ungaged tribu-
taries and immediate drainage contributed an estimated 32.3%.
Direct precipitation was estimated to have contributed the
remaining 42.5%.
Tahoe's oligotrophic nature results from a restricted water-
shed of granite rock (Goldman, 1968). Human influence in the
basin, however, is disturbing the ecological stability of the
region. The Lahontan Regional Water Quality Control Board and
State Water Resources Control Board (1975) list lake and stream
siltation as the major water quality problem in the lake.
Activities such as housing construction, road building and lon-
ging remove natural vegetation and expose the soil to erosion.
Enrichment from urban and nonurban runoff further contributes to
the process of eutrophication in Lake Tahoe. As the population
of the area grows, problems of siltation and urban runoff can be
-------
expected to increase.
Several studies have provided evidence for the influence
of tributaries on the deterioration of water quality in the
lake. Goldman (1974) reports primary productivity is generally
high near shore and at creek mouths and low in the middle of
the lake. Chemical analysis of 31 tributaries to the lake
showed the average total nitrogen was approximately twice that
of the lake and average total phosphorus 3 times as great
(Lake Tahoe Area Council, 1971). As would be expected, tribu-
taries draining highly developed areas contain more nutrients
and have a greater stimulatory effect on algal growth than
tributaries draining undeveloped land (Lake Tahoe Area Council,
1974; Goldman, 1974).
The Lake Tahoe Area Council also considers precipitation
to be an important contributor of nutrients to the lake. They
found the concentration of nitrogen in melted snow is 2.5 times
that of the lake and total phosphorus is double lake water.
Their report estimates the amount of nitrogen in direct pre-
cipitation plus runoff is equivalent to the secondary sewage
effluent discharged from a town of 66,000 people.
The outlet of Lake Tahoe is controlled by gates at Tahoe
City. The Truckee River is used for power, municipal and
agricultural purposes and is also important for the maintenance
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of fish and wildlife habitats (Lahontan Regional Water Quality
Control Board and State Water Resources Control Board, 1975).
Decisions on water management in the Tahoe Basin will have
a major impact on downstream uses.
The exceptional water quality of Lake Tahoe makes it
a valuable natural resource. Man's activities have accelera-
ted the rate of eutrophication in the lake and population
growth and land development pose an increasing threat to the
environment. The need for stringent land use regulations
is demonstrated by the sensitivity of the lake to changes
in its watershed. Future development in the basin should be
carefully evaluated to maintain the existing high water
quality of the lake.
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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. Outlet
drainage area includes the lake surface area. 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:
1. Surface area: 501.82km2.
2. Mean depth: 307.8 meters.
3. Maximum depth: 501.7 meters.
4. Volume: 154,186.250 x 106 m3.
5. Mean hydraulic retention time: 174,104 days (477 yrs).
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean Flow
Name area (km2) (nr/sec)
A-2 Upper Truckee River 141.9 3.35
B-l Ward Creek 25.1 0.88
D-l Third Creek 15.5 -0.23
J-l Trout Creek 104.6 1.34
K-l Taylor Creek 46.9 1.51
N-l General Creek 19.9 0.75
P-l McKinney Creek 13.2 0.50
Minor tributaries and
immediate drainage - 445.5 9.29
Total 812.6 17.85
2. Outlet - A-l Truckee River 1,307.9 10.25
C. Precipitation:
1. Year of sampling: 72.8 cm.
2. Mean annual: 84.2 cm.
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III. LAKE WATER QUALITY SUMMARY
Lake Tahoe 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 collected
from ten stations (Stations 02 and 08 were samples only twice) on
the lake and from a number of depths at each station (see map, page
v). During each visit, temperature profiles were obtained from
continuous analog recorders and depth-integrated samples were col-
lected 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 73.2
02 53.3
03 73.2
04 18.9
05 73.2
06 71.9
07 73.2
08 73.2
09 65.8
10 73.2
Sample collection was limited to the upper 240 feet (73.2 meters)
of the water column because of cable length. Consequently, data
from deeper waters were not collected. Secchi disc readings were
also limited to 600 inches (15.2 meters), due to line length; past
-------
data indicate Secchi disc readings in Lake Tahoe are typically
25-35 meters (T. Bailey, personal communication). 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-B for waters at the surface and at the maximum
depth for each site. Results of the phytoplankton counts and chloro-
phyll a_ determinations are included in III-C. Results of the
limiting nutrient study are presented in III-D.
Temperature:
Temperature profiles during the March sampling (Figure 1) show
a nearly isothermal water column and indicate winter mixing to the
depth of sample collection. A well-developed thermocline is evident
in the July profiles (Figure 2). In November (Figure 3), the ther-
mocline is deeper and mixing is apparent to approximately 30 m.
Goldman (1974) reports deep mixing in the lake and an almost
homothermous water column from the end of December to April or May.
Paerl et al. (1975) provide evidence that the lake was holomictic
in 1973. However, they note that the lake may not turn over com-
pletely every year. Since the depth of vertical mixing effects the
amount of nutrients available for phytoplankton growth, they suggest
differences in the amount of overturn may be responsible for the
yearly variations in productivity.
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Temperature 345 456 456 456 456
iii iii iii iii iii
(°C) 345)3456 456 456 456
0- ' -^
20-
-
40-
60-
-
80-
|ioo-
Q.
^120-
-
140-
160-
j i
1
-
.' ' ^
2
-
180- :
200 —
220-
_
1 L^
J
.
-
3
I i
4
-
-
_i i -
.
5
.
~y~ —
6
-
-
.
!
-
_
8
-
r'
_ —
9
_
-
^
.
- ' — 0 - 0
- 20
— 10
- 4O
_
- 60
-20
10
- 80
— 100 ~30
Z: r "in
- a) i <-
Q) Q. ^>
- 120 Q |
-4O
-140
-160
-50
-180
—200 ~6
-22O
-70
-24O
Figure 1. Temperature vs. Depth - Lake Tahoe, March 1975.
Numerals indicate station number; — indicates location
of physical water samples; cross hatch indicates depth of
bottom.
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Temperature
20-
40-
60-
8O-
-1OO-
a
&
120-
140-
16O-
180-
2OO
22O
-160
-180
-200
-220
-240
-4O
-50
-60
-70
Figure 2. Temperature vs. Depth - Lake Tahoe, July 1975.
Roman numerals indicate station number; Arabic numerals indicate
temperature scale; circles indicate depth of physical water
samples; cross hatch indicates depth of bottom.
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14O-
160-
180-
2OO —
220-
O - O
- 10
-220
-24O
-60
-70
Figure 3. Temperature vs. Depth - Lake Tahoe, November 1975.
Roman numerals indicate station number; Arabic numerals indicate
temperature scale; circles indicate depth of physical water
samples; cross hatch indicates depth of bottom.
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3/l-JD CHF.^ICAL CHARACTERISTICS
I h/27/75 >
RANGT
••(ANf'fc MtOJAN <«ETFKS)
( ll/ 4/75 )
MAX
S«o« = 5 DEPTH
RAMfiE
PANGF MEDIAN (METEftS)
O.-l .s •- HEPTH 1 -
OISM'X.VFO OXYGFM (••-"_>
r,.-i ,
o.-i.1; M HEMTH lo
WAX OEPTHOO 5
DISSOLVED OwTHQ P (MG/L)
o.-l.s M OEPTH 10
MAX DFPTHO* ->
NO?»N03 (MG/L)
o.-i .s ' CEPTH ; -i
MAX OEPTrt»« -
KJtLHahL U (HG/L)
n.-l.S ••• OEPTH In
VAX OF_PTri»» S
4
3.7- s.^ H.3
3.7- S.4 5.3
9.4- 10.3 9.fi
?.^- in.n 9.9
'o:: ^: 9^:
^.1- 7.9 7.7
4
O.OOP-0.01? 0.005
0.002-0.01^ O.onj
0.0?'l-n.il(T. 0.^30
•i.o?o-o.o?n o.o? o
'"'.0*0-0.0? ("i ij . n ? o
0.0?0-0.020 (J.0?0
o.?oo-o.ioo o.?oo
o.?on-o.20o o.?oo
15.*- IS.? IS. 2
0.0- 1 . ->
1H.3- 73. •.
0.0- 1.-
1^.3- 73. !
0.0- l.S
lfl.3- 73.1
0.0- 1.4
lfl.3- 73.1
0.0- l.i
IB. 3- 73. 1
0.0- 1.5
1R.3- 73.1
0.0- l.i
1«.3- 73.1
o.o- i.-*
1^.3- 7.1.1
0.0- !.->
0.0- 1 . i
1«.3- 73.1
7 •*.«.-
M 4.H-
4 -J.8-
4 f>0 . —
4 <*.')-
3 50.-
^ 0.005-0
4 0.005-0
h 0.004-0
4 0.003-0
* n. oo 5-0
4 0.005-0
» 0.010-0
4 o.oso-o
4 *
11 .8
5.9
10.0
81.
all
bb.
53.
.015
.010
.010
.009
.030
.020
.0,'JO
.200
.200
IS. 2
11.8
8.3
9.8
61.
s'.i
51.
0.009
0.006
0.009
0.004
0.0?0
0.0?0
0.030
0.020
0.200
0.200
6.1
0.0-
18.3-
0.0-
18.3-
0.0-
18.3-
0.0-
13.3-
0.0-
13.3-
0.0-
18.3-
0.0-
18.3-
0.0-
lfl.3-
0.0-
ltt.3-
0.0-
18.3-
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
64.0
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
10
5
10
S
10
5
10
5
10
5
10
5
10
5
10
S
10
5
10
5
11.6- 1?.9
6.4- 1?.?
B.4- Q.O
9.0- 10.2
53.- P9.
47.- 94.
7.6- 8.1
7.9- B.I
39.- 49.
34.- 50.
0.002-0.004
0.002-0.005
0.002-0.002
0.002-0.002
0.020-0.020
0.020-0.020
0.020-0.020
0.020-0.020
0.20C-O.POO
0.200-0.200
15.2- IS. 2
12.5
9.5
H.7
10.0
53.
55.
8.0
8.0
44.
4ft.
0.003
0.004
0.002
0.002
0.020
0.020
0.0?0
0.020
0.200
0.200
15.2
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18.9-
0.0-
18,9-
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
1.5
73.1
M = NO. nf SA«°LFS
VHXIMUM DEPTH SAMPLED AT f-.'>Ch
» S = NO. OF StTFS SAMr'Ltf) IN T-iI<: OfcTE
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14
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
03/18/75
07/02/75
11/04/75
Algal
Dominant Units
Genera Per ml
1. Nitzschia 35
2. Stephanodiscus 35
Other genera —
Total 70
1. Nitzschia 302
Other genera —
Total 302
1. Centric diatom 6
2. Cymbella 6
3. Gymnodim'um 3
Other genera —
Total 15
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15
2. Chlorophyll a_ -
Sampling Station Chlorophyll a_
Date Number (yg/1)
03/18,24/75 01 0.9
02 0.9
03 0.5
04 0.5
05 0.4
06 0.5
07 0.5
08 0.5
09 0.5
10 0.7
06/27/75, 07/02/75* 01 0.8
02
03 0.4
04 0.6
05 0.4
06 0.5
07 0.5
08
09 0.3
10 0.3
11/04/75 01 3.0
02 0.5
03 0.4
04 0.3
05 0.3
06 0.3
07 0.4
08 0.2
09 0.4
10 0.5
*It should be noted that the California Department of Water
Resources indicates maximum chlorophyll a^ levels in Lake Tahoe are
found as deep as 100-110 meters in late summer so would not be de-
tected by NES due to sampling depth limitations (T. Bailey, Personal
Communication).
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16
D. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N
Spike (mg/1) Cone, (mg/1) Cone, (mg/1)
a. 03/18,24/75
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
b. 11/04/75
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
Stations
0.010
0.060
0.060
0.010
Stations
0.010
0.060
0.060
0.010
Stations
<0.005
<0.055
<0.055
<0.005
Stations
0.005
0.055
0.055
0.005
Stations
0.005
0.055
0.055
0.005
Stations
0.005
0.055
0.055
0.005
01-04
0.025
0.025
1.025
1.025
05-07, 10
0.030
0.030
1.030
1.030
08,09
<0.010
<0.010
<1.010
<1.010
01-04
0.035
0.035
1.035
1.035
05-06
0.030
0.030
1.030
1.030
07-10
0.030
0.030
1.030
1.030
Maximum Yield
(mg/1-dry wt.)
0.1
1.2
8.8
0.1
0.2
2.0
22.1
0.2
0.2
1.7
23.0
0.2
0.2
2.6
27.4
0.2
0.2
2.2
25.5
0.2
0.2
2.3
25.4
0.2
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17
2. Discussion -
The control yields of the assay alga, Selenastmm capri-
cornutum*, indicate that the potential for primary productivity in
Lake Tahoe was low during both sample, collection times (03/18,24/75,
11/04/75). In all assays, the increase in growth over control
yields in response to the addition of phosphorus as well as the
lack of response to the addition of nitrogen alone indicates phos-
phorus limitaton. Maximum yield was achieved with the simultaneous
addition of both nitrogen and phosphorus.
The mean inorganic nitrogen to orthophosphorus (N/P) ratios of
6/1 and 8/1 in the spring and summer, respectively, suggest primary
limitation by nitrogen. The fall ratio of 20/1 suggests primary
limitation by phosphorus (a mean N/P ratio of 14/1 or greater
generally reflects phosphorus limitation). These ratios, however,
are only approximate as nutrient concentrations in many of the
samples were below the sensitivity of detection methods.
Data from the Lake Tahoe Council (1971) indicate the lake is
limited by available nitrogen; Goldman (1974) reports Lake Tahoe is
primarily nitrogen and iron sensitive; although phosphorous levels
have some effect on algal growth in the lake.
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18
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 (page v), except for the high
runoff months of April, May and July 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
annual nutrient loads, in kg/km2/year, in the Upper Truckee River,
Ward Creek, Third Creek, Trout Creek, Taylor Creek, General Creek
and McKinney Creek at Stations A-2, B-l, D-l, J-l, K-l, N-l, and
2
P-l and multiplying the means by the ZZ area in km .
-------
19
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 Upper Truckee River 1,935 9.4
B-l Ward Creek 395 1.9
D-l Third Creek 245 1.2
J-l Trout Creek 1,480 7.2
K-l Taylor Creek 630 3.0
M General Creek 375 1.8
P-l McKinney Creek 155 0.7
b. Minor tributaries and immediate
drainage (nonpoint load) - 6,680 32.3
c. Known municipal STP's - None
d. Septic tanks - None
e. Known industrial - None
f. Direct precipitation* - 8.780 42.5
Total 20,675 100.0%
2. Outputs - A-l Truckee River 3,440
3. Net annual P accumulation - 17,235
*Estimated (See NES Working Paper No. 175).
-------
20
Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 Upper Truckee River 56,410 6.8
B-l Ward Creek 10,350 1.2
D-l Third Creek 3,095 0.4
J-l Trout Creek 12,520 1.5
K-l Taylor Creek 22,240 2.7
N-l General Creek 10,540 1.3
P-l McKinney Creek 6,600 0.8
b. Minor tributaries and immediate
drainage (nonpoint load) - 167,510 20.1
c. Known municipal STP's - None
d. Septic tanks - None
e. Known industrial - None
f. Direct precipitation* - 541,765 65.2
Total 831,030 100.0%
2. Outputs - A-l Truckee River 76,385
3. Net annual N accumulation - 754,645
*Estimated (See NES Working Paper No. 175).
-------
21
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary kg P/km/yr kg N/km /yr
Upper Truckee River 14 398
Ward Creek 16 412
Third Creek 16 200
Trout Creek 14 120
Taylor Creek. 13 474
General Creek 19 530
McKinney Creek 12 500
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
C-2 Unnamed Creek 0.010 0.507
E-l Mill Creek 0.055 0.688
F-l Secret Harbor Creek 0.028 1.006
G-l Slaughterhouse Canyon Creek 0.052 1.082
W-l Griff Creek 0.024 0.534
X-l Edgewood Creek 0.039 0.374
Y-l Heavenly Valley Creek 0.024 0.980
Z-l Lonely Gulch Creek 0.020 0.870
1-Q Juniper Creek* 0.038 0.510
1-T Daggett Creek* 0.031 0.476
1-U Unnamed Creek in Water Canyon* 0.053 0.612
4-1 Martis Creek* 0.038 0.648
Phosphorus values in Mill Creek, Griff Creek, Edgewood Creek,
and Lonely Gulch Creek are in close agreement with values reported
by the Lake Tahoe Area Council in 1971, as are the nitrogen levels
in Edgewood Creek. Nitrogen values in the other three creeks men-
tioned above, and nutrient levels in Secret Harbor Creek and Slaugh-
terhouse Canyon Creek are approximately twice those reported by the
Council with the exception of Lonely Gulch Creek in which the NES
nitrogen value is four times as great.
*Special interest streams outside the Lake Tahoe watershed.
-------
22
Heavenly Valley Creek was the subject of a study by Perkins,
et. al. (1975) who found high levels of NOs-N in the creek and
traced these concentrations to sewage effluent spraying in the
area five years before their study.
F. 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
(q/nr/yr)
Estimated loading for Lake Tahoe 0.04
Vollenweider's "eutrophic" loading 0.15
Vollenweider's "oligotrophic" loading 0.08
-------
23
LITERATURE REVIEWED
Bailey, T. E. 1977. Personal communication (secchi disc and
chlorophyll a levels). California State Water Resources Control
Board. Sacramento, California.
Dugan, Gordon L. and P. H. McGauhey. 1974. Enrichment of Surface
Waters. Journal Water Pollution Control Federation 46:2261-2280.
Goldman, Charles R. 1968. Aquatic Primary Production. American
Zoologist 8:31-42.
Goldman, Charles R. 1974. Eutrophication of Lake Tahoe Emphasizing
Water Quality. EPA-660/3-74-034, U.S. Environmental Protection
Agency. Con/all is, Oregon.
Lahontan Regional Water Quality Control Board and State Water
Resources Control Board. 1975. Water Quality Control Plan
Report, North Lahontan Basin (6A). Oakland, California.
Lake Tahoe Area Council. 1971. Eutrophication of Surface Waters -
Lake Tahoe. 16010DSW 05/71, U.S. Environmental Protection Agency.
South Lake Tahoe, California.
McCurry, Wendell. 1976. Personal communication (septic tanks).
Nevada Environmental Protection Services. Carson City, Nevada.
Paerl, Hans W., Robert C. Richards, Robert L. Leonard, and Charles
R. Goldman'. 1975. Seasonal Nitrate Cycling as Evidence for
Complete Vertical Mixing in Lake Tahoe, California-Nevada. Lim-
nology and Oceanography 20:1-8.
Perkins, Michael A., Charles R. Goldman, and Robert L. Leonard. 1975.
Residual Nutrient Discharge in Streamwaters Influenced by Sewage
Effluent Spraying. Ecology 56:453-460.
U.S. Environmental Protection Agency. 1971. 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.
-------
24
Vollenweider? R. A, 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydro!. 37:53-84.
Williams, James B., Jr. 1974. Personal communication (lake mor-
phometry). Department of Human Resources, Carson City, Nevada.
Wise, John. 1972. The Lake Tahoe Study. U.S. Environmental Pro-
tection Agency. San Francisco, California.
-------
25
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.201 = feet
Cubic meters x 8.107 x 10 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 - Ibs/square mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR NEVADA
1/21/77
LAKE CODE 320b
LAKE
TOTAL DRAINAGE AREA OF LAKF
-------
FLOB IKFOSMATION rOk NEVADA
1/21/77
LA
-------
TRIBUTARY FLOW INFORMATION FOrt NEVADA
1/P1/77
LAKE CODE 3205
LAKE TAHOc
MEAN MONTHLY FLO^S AND DAILY FLG*S
32f5Nl
320572
MONTH
YEAH
11
12
1
2
3
4
5
6
7
a
9
10
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
75
76
75
75
75
75
75
75
75
75
74
74
75
75
75
75
75
75
75
75
75
75
74
74
75
75
75
75
75
75
75
75
75
75
N FLO*
0.054
0.062
0.07).
0.074
0.136
0.283
2.350
3.143
0.793
0.110
0.057
0.258
0.037
0.042
0.045
0.048
0.091
0.193
1.557
2.067
0.538
0.074
0.037
0.170
1.416
1.274
1.416
1.614
2.435
3.396
?8.600
45.307
12.233
2.577
1.161
3.596
LAY
17
?n
10
?«•
31
17
lq
17
•}
?7
?«>
q
1R
2n
IP
26
31
17
1C
17
•3
27
2*
9
FLOw' DAY
FLOW DAY
FLOW
0.059
0.065
0.082
0.195
0.156
2.662
2.888
1.303
0.085
0.048
0.048
0.034
0.040
0.042
0.054
0.127
0.119
1.756
1.926
0.850
0.057
0.031
0.031
30
28
28
30
28
28
0.396
3.794
0.275
0.258
2.520
0.181
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STOPET RETRIEVAL DATE 77/01/23
N&TL EUTROPHICATIOfJ SURVEY
E.PA-LAS VEGflS
/TYPA/SMBNT/LAKE
DATE
FROW
TO
7S/03/ia
75/06/27
75/11/04
TIME DEPTH «
OF
DAY FEET
09
09
09
09
09
09
09
09
1?
1?
12
12
12
12
12
12
12
12
12
12
12
12
12
1?
45
45
45
45
45
45
45
45
40
40
40
40
40
40
40
40
40
25
25
25
25
25
25
25
0000
0005
0025
0050
0100
0150
0200
02*0
0000
OOOS
0015
0040
0080
0115
0150
0195
0220
0000
0005
0020
0050
0090
0130
0175
00010
IATER
TEMP
CEWT
3.7
3.9
3.8
3.8
3»8
3.8
3.8
3.7
9.8
9.6
9.1
8.1
6c9
5.7
4.9
4.4
4.2
12.9
12.8
12.8
12.6
12.3
11.7
9.5
00300
DO
MG/L
9.H
9.6
9.6
9.8
9.8
9a8
9. fa
9.6
9.0
4.8
8.6
9.2
9.6
9.8
10.0
10.0
9.8
8.8
8.6
8.6
8.8
8.6
9.4
10.2
320561
38 57 58.0 J20
LAKE TfiHOE
32005 fMEVGDA
HEPALES
00 &2»0 3
150191
04001002
0999 fEET DEPTH CL^SS
00300
DO
MG/L
9.H
9.6
9.6
9.8
9.8
9a8
9. fa
9.6
9.0
4.8
8.6
9.2
9.6
9.8
10.0
10.0
9.8
8.8
8.6
8.6
8.8
8.6
9.4
10.2
00077 00094
TfcftKi^P OJOUCTVY
<;tCCHI FIELD
Tf.CHtS MICHOMHO
600 89
92
91
91
108
91
89
90
600 65
70
70
69
65
60
60
60
60
600 53
53
53
53
51
51
47
00400
PH
su
7.00
7.30
6010
6.50
6.35
6.40
6.10
6.15
8.40
8.40
8.35
a. 35
8.30
8.20
8.20
8.10
8.10
7.90
8.00
8.00
8.00
8.00
8.00
8.00
00410
T ALK
CAC03
MG/L
52
51
52
53
53
53
54
54
44
44
40
37
37
37
40
00610
NH3-N
TOTAL
MG/L
0.020
C.020K
0.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.015
0.012J
0.025
0.015
0.015
0.010
0.015
0.015
0.010
0.020K
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.020K
00
C0625
TOT KJEL
N
MG/L
00200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.100
0.050K
0.050
0.100
0.050K
O.ObOK
0.050K
0.050K
0.050K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
NO?&Nn3
N-TOT^L
MG/L
0.0?0
O.o?o
0.020
0.020
0.0?OK
0.020
0.020K
0.020K
0.005
0.00«>
o.oo*;
0.005
0.005
o.oos
0.005
0.005
o.oos
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PHOS-DIS
OQTHO
MG/L P
0.003
0.004
0.003
0.003
0.002
0.003
0.003
0.003
0.005K
0.005K
0.005K
0.005K
0.005K
0.005K
0.005K
0.005K
O.OOSK
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
ST03ET RETRi'EVfeL
77/C1/2&
330501
30 57 58»0 120 00 42,0 3
LAKE VflHOE
320CS NEVADA
1<50191
/TVP&/AM8MT/L6KE
00665
OflTE TIME DEPTH PHOS-TQT
FRO* OF
TO DAY FEET MG/L P
11EPSLES 04001002
0999 FEET DEPTH C^SSS 00
3^217
A
UG/L
00031
I^CDY LT
RFMNING
PFMCENT
75/03/18
75/06/27
75/11/04
09
09
09
09
09
09
09
09
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
45
45
45
45
45
45
45
45
40
40
40
40
40
40
40
40
40
25
25
25
25
25
25
25
0000
0005
0025
OObO
0100
OlbO
0200
0240
0000
0005
001S
0040
00*0
0115
0150
0195
0220
0000
0005
0020
0050
OOSO
0130
0175
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.015
.007
.006
.007
.004
.004
.004
.005
.010K
.010K
.010K
.010K
.010K
.010K
.010*
.010K
.010K
.004
.003
.003
.003
.003
.003
.004
0.<5
o.a
3.0
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DSTt
HATL EUTROPHICfiTION
tPA-LAS VEGAS
/TYPft/AM8N!T/LA:
-------
STORE! «ETPIL'/AL UATfc. 77/01/26
MAIL l-UTPOPHICATIC'f-i SUWVtY
EPA-LA5 VEGAS
330503
38 59 32.0 120 03 30.0 3
LAKE TAHOE
06017 NEVADA
/TYPA/AM8MT/LAKE
DATE
TO
75/03/24
75/07/02
75/11/04
00010
TIME PEPTH WATER
OF TF.MP
DAY FEET
09
09
09
09
09
09
09
09
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
25
25
25
25
25
25
2b
25
35
35
35
35
35
35
35
35
20
20
20
20
20
20
21
0000
0005
0025
0050
0100
0150
0200
0240
0000
ooos
0030
0065
0100
0140
0180
0220
0000
0005
0020
0050
0090
0130
0175
CtNT
5.0
5.4
b.3
5.3
b.2
5.1
5.0
5.0
10.8
10.7
9.9
8.2
4.9
4.2
3.5
3.3
12.2
12.1
12.6
12.6
12.3
11.9
10.5
11EPALES
04001002
0999 FEET DEPTH CLASS
00300
00
MG/L
9.6
9.8
9.8
9.4
9.6
9.8
9.8
9.6
8.4
9.0
8.6
9.6
10.0
10.0
10.0
9.8
8.6
8.8
8.8
8.8
9.0
9.4
10.0
00077 00094
TMANSP CNDUCTVY
SECCHl FIELD
INCHES HICROMHO
600 94
90
92
92
94
94
91
240 73
72
75
69
62
63
61
60
600 53
53
53
53
53
51
49
00400
PH
SU
7.70
7.75
7.70
7.75
7.75
7.70
7.70
7.80
8.00
8.00
8.00
8.00
e.oo
8.00
8.00
8.00
8.00
e.oo
8.00
8.00
8.10
8.00
P. 05
00410
T ALK
CAC03
MG/L
46
46
47
47
51
52
52
53
52
56
55
55
55
53
53
53
46
44
41
42
43
43
42
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.020
0.0?OK
0.020
0.020K
0.020K
0.020K
0.030
0.030
0.030
0.020
0.030
0.020
0.020
0.020
0.0?OK
0.020K
0.0?OK
0.0?OK
0.020K
0.020K
0.020K
00
00625
TOT KJtL
N
MG/L
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.300
0.300
0.200
0.200
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
M02&N03
N-TOTAL
MG/L
0.040
0.020
0.020
0.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
O.D20K
0."20K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
ooe>7l
PHOS-DIS
OWTHO
MG/L P
0.014K
0.011K
0.011K
0.012K
0.01SK
0.012K
0.011K
0.012K
0.010
0.014K
0.011K
0.011K
0.011K
0.003J
0.011K
0.003J
0.002K
0.00?K
0.002K
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPMICATION SURVEY
EPA-LAS VEGAS
/TYPA/AM3NT/LAKE
320503
38 59 32.0 120 03 30.0 3
LAKE TAHOE
06017 NEVADA
150191
11EPALES 0400100?
0999 FEET DEPTH CLASS 00
DATE
FPO*
TO
75/03/24
7b/07/02
75/11/04
00665 32217 OOU31
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF
DAY
09
09
09
09
09
09
09
09
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
FEET
25
25
25
25
25
25
25
25
35
35
35
35
35
35
35
35
20
20
20
20
20
20
20
0000
0005
0025
0050
0100
0150
0200
0240
0000
0005
0030
0065
0100
0140
0180
0220
0000
0005
0020
0050
0090
0130
0175
A PFMNING
MG/L P UG/L PFPCENT
0.006 0.5
0.007
0.005
0.006
0.009
0.007
0.004
0.004
0.008 0.4
0.008
0.005
0.005
0.005
0.005
0.005
0.005
0.002K 0.4
0.002K
0.002K
0.002
0.002K
0.002
0.002
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL
N6TL
tPA-LAS VEGAS
/TYDA/AM8NT/LAKE
77/01/26
SURVEY
DATE
FROM
TO
75/03/24
75/07/0?
75/11/04
00010
TIME DEPTH WATER
OF TEMP
DAY FEET
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
20
20
20
20
20
20
05
05
05
05
05
05
50
50
50
50
50
0000
0005
002=i
0040
0050
0060
OOOd
000=;
oois
0030
OObO
0060
0000
0005
0020
0040
0062
CENT
5.3
5.6
5.6
5.3
5.3
5.4
11.8
11.7
11. fi
10.2
5.9
12.5
12.5
12.4
12.3
12.2
320504
39 01 36.0 119 57 25.0 3
LAKE TAHOE
32005 NEVADA
150191
llEPflLES 04001002
006b FEET DEPTH CLASS 00
00300
DO
MG/L
9.9
10.2
9.8
10.0
10.0
10.0
8.0
8.0
8.0
8.3
8.8
9.8
9.0
8.8
8.6
8.8
9.0
00077 00094
TRANSP CNDUCTVY
?Eccni FIELD
INCHES MICROMHO
600 96
94
92
93
92
93
240 79
79
82
75
69
69
600 53
53
55
55
55
00400
PH
su
7.80
R.OO
7.85
7.75
7.85
7.85
8.10
8.05
8.10
8.00
e.oo
8.00
8.00
8.10
8.00
8.05
8.00
00410
T ALK
CAC03
MG/L
53
53
54
53
51
49
50
50
50
51
52
52
45
43
47
49
49
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
O.OPOK
0.020K
0.020K
O.OPOK
0.030
0.020
0.030
0.020
0.020
0.020
0.020K
0.020K
0.020K
O.OPOK
0.0?OK
00625
TOT KJEL
N
MG/L
0.200K
0.300
0.200K
Q.200K
0.300
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
O.POOK
00630
NOP&N03
N-TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00*>71
PHOS-DIS
OPT-iO
Mfi/L f
0.011K
0.01PK
0.011K
0.010K
0.010K
0.002J
0.010K
0.009K
0.009K
0.008K
0.004J
0.004J
0.002K
0.002K
0.002K
0.002K
0.002K
DATE
PROM
TO
75/03/24
75/07/02
75/11/04
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL IMCDT LT
Of A RFMNING
DAY FEET
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
20
20
20
20
20
20
05
05
05
05
05
05
50
50
50
50
50
0000
0005
0025
0040
0050
0060
0000
0005
0015
0030
0050
0060
0000
0005
0020
0040
0062
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.005
.004
.003
.002
.002
.002
.005
.005
.004
.005
.005
.005
.004
.002
.002
.002K
.002
UG/L PFHCENT
0.5
0.6
0.3
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STCRET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATIO'-J SUHVEY
tPA-LAS VF.GAS
/TYPA/AMBNT/LAKE
DATE
FROM
TO
75/03/24
75/07/02
75/11/04
TIME
OF
DAy
12
12
12
12
12
12
12
12
09
09
09
09
09
09
09
09
13
13
13
13
13
13
13
13
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
05
05
05
05
05
OS
OS
OS
DEPTH
FEET
0000
0005
002S
0050
0100
0150
0200
0240
0000
000s"
0030
0065
0100
0140
oiao
0220
0000
0005
0030
0070
0123
0160
0200
0240
00010
WATER
TEMP
CENT
5.1
5.3
5.2
5.1
5.2
5.2
5.2
5.2
10.9
10.9
10.7
10.0
5.9
4.5
3.4
3.4
11.9
11.6
11.4
11.4
10.7
7.8
6.5
5.7
320505
39 0* 34.0 120 02 55.0 3
LAKE TAHOE
06061 NEVADA
150101
11EPALES
04001002
0999 FEET DEPTH CLASS
00300
DO
MG/L
9.8
9. a
9.6
9.6
9.3
9.9
9.8
9.6
9.0
8.6
8.8
8.6
9.8
10.0
10.2
10.0
9.0
A. 8
8.4
8.6
9.2
10.0
10.8
9.8
00077 00094
TRANSP CNOUCTVY
SECCHI FIELD
INCHES MICROMHO
600 96
93
94
94
93
90
93
240 73
74
74
73
65
64
63
62
600 79
96
70
78
51
66
t>3
64
00400
PH
SU
7.80
7.80
7.90
7.80
7.85
7.70
7.90
7.90
8.05
7.90
7.90
7.95
8.10
8.10
8.10
8.10
8.10
8.10
8.10
8.10
8.10
8.10
8.10
8.00
00410
T ALK
CAC03
MG/L
47
48
45
43
44
44
44
44
49
45
46
47
53
56
54
51
46
44
42
40
43
46
46
47
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
O.OPOK
0.020K
0.020K
0.020
0.020
Q.020K
0.030
0.030
0.020
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00
00625
TOT KJEL
N
MG/L
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.2COK
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.0?OK
0.020K
0.020K
0.030
0.020K
0.020
0.020
0.020K
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
O.Q20K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PHOS-OIS
OPTHO
M<3/L P
0.010K
0.010K
0.010K
0.005K
O.OOUK
0.005K
0.005K
0.005K
0.009K
0.002K
0.002K
0.002K
0.010K
0.010K
0.009K
0.011K
0.002K
0.002K
0.002
0.002K
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
ST04ET RETRIEVAL DATE 77/01/86
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
320505
39 0* 34.0 120 02 55.0 3
LAKE TAHOE
06061 NEVADA
150191
11EPALES
0999 FEET
DEPTH
0400100?
CLASS 00
DATE
TO
75/03/24
75/07/02
75/11/04
00665 32217 00031
TIME DEPTH PhOS-TOT CHLRPHYL INCDT LT
ot- A REMNING
DAY FEET
12
12
12
12
12
12
12
12
09
09
09
09
09
09
09
09
13
13
13
13
13
13
13
13
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
40
05
05
05
05
05
OS
05
05
0000
0005
0025
0050
0100
0150
0200
0240
0000
0005
0030
0065
0100
0140
0180
0220
0000
0005
0030
0070
0123
0160
0200
02*0
MG/L P
0.003
0.002
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.007
0.005
0.005
0.005
0.004
0.005
0.005
0.006
0.002
0.002
0.003
0.004
0.003
0.003
0.004
0.003
UG/L PERCENT
0.4
0.4
0.3
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL OATE 77/01/26
NATL tUTROPHICATION SuRvEY
EPA-LAS VfcGAS
/TYPA/ftMBNT/LAKE
DATR
FROM
TO
75/03/24
75/07/02
75/11/04
0001 0
TIME DEPTH wATER
OF TEMP
DAY FEET
13
13
13
13
13
13
13
09
09
09
09
09
09
09
09
09
09
14
14
14
14
14
14
14
14
25
25
25
25
25
25
25
20
20
20
20
20
20
20
20
20
20
30
30
30
30
30
30
30
30
0000
ooos
0025
0050
0100
0125
0160
0000
0005
0020
0050
0060
0090
0110
0150
0180
0210
0000
0005
0030
0070
0117
0170
0200
0236
CENT
5.5
5.5
5.4
5.4
5.3
5.3
5.3
11.8
11.8
11. ft
11.4
7.4
5.4
5.0
4.5
4.0
3.8
11.8
11.6
11.4
11.1
10.3
7.9
7.2
6.4
320506
39 07 20.0 119 57 28.0
LAKE TAHOE
32025 NEVADA
150191
11EPALES 04001002
0170 FEET DEPTH CLASS 00
00300
DO
MG/L
9.8
9.8
9.8
9.6
10.0
10.0
9.9
8.6
8.3
8.6
8.6
9.2
9.6
9.6
7.6
10.0
9.8
8.4
8.6
8.8
8.8
9.2
10.0
10.8
10.0
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES M1CROMHO
bOO 96
92
91
92
92
93
93
240 81
72
74
77
64
63
60
68
6?
62
600 79
78
75
74
75
70
68
64
00400
PH
SU
7.80
7.80
7.75
7.80
7.70
7.60
7.90
8.10
8.10
8.10
8.20
8.10
8.10
8.20
8.10
8.10
8.05
8.10
8.10
8.10
8.10
8.10
8.10
8.10
P. 10
00410
T ALK
CAC03
MG/L
44
45
45
44
46
46
46
56
48
51
47
50
50
50
50
48
50
48
49
52
44
OR
49
49
50
00610
NH3-N
TOTAL
MG/L
0.020K
0.0?OK
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.290
0.030
0.040
0.030
0.020
0.030
0.030
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.0?OK
0.020K
00625
TOT KJEL
N
MG/L
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
O.OOOW
0.200K
0.200K
OOA^O
N02J.N03
N-TOTAL
MG/L
0.020K
0.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
O.Q20K
0.020K
0.020K
0.020K
O.OOOR
0.020K
0.020K
0.020K
00671
PHOS-DIS
ORTHO
MG/L c
0.012K
0.006K
O.OOQJ
0.005J
0.009K
0.005J
0.012K
0.010K
0.010K
0.008K
0.004J
0.010K
0.004J
0.004J
0.009K
0.010K
0.009K
0.002K
0.002K
0.002K
0.002K
O.OOOR
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
R VALUE INDICATES NO RESULT
REPORTED
-------
STORET RETRIEVAL DATt 77/01/26
NATL EUTROPHICflTION SURVEY
tPA-LAS VEGAS
/TYPA/AMBNT/LAKE
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHVL
FROM OF A
TO OAV FEET MG/L P 'JG/L
75/03/24 13 25 0000 0.003 0.5
13 25 0005 O.OOaK
13 25 0025 0.008
13 25 0050 0.007
13 25 0100 0.008
13 25 0125 0.006
13 25 0160 0.007
7^/07/02 09 20 0000 0.009 0.5
09 20 0005 0.006
09 20 0020 0.005
09 20 0050 0.006
09 20 0060 0.005
09 20 0090 0.005
09 20 0110 0.004
09 20 0150 0.005
09 20 0160 0.005
09 20 0210 0.005
75/11/04 14 30 0000 0.003 0.3
14 30 0005 0.002
14 30 0030 0.002
14 30 0070 0.002
14 30 0117 0.002
14 30 0170 O.OOOR
14 30 0200 0.00?
14 30 0236 0.002
320506
39 07 20.0 119 &7 28.0
LAKE TAHOE
32025 NEWADfl
150191
11EPALES
0170 FEET
04001002
DEPTH CLASS 00
00031
IMCDT LT
PFMMNG
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
R VALUE INDICATES NO RESULT
REPORTED
-------
STORET RETRIEVAL GAT£ 77/01/36
NttTL EUTROPMICftTIO'j 5UHVEY
EPA-LAS VEGAS
320507
39 09 55.0 120 02 05.0 3
LAKE TAHOE
06061 NEVADA
/TYPA/AMBNT/LAKE
11EPALES 04001002
0999 FEET DEPTH CLASS 00
DATE
FROM
TO
75/03/24
7b/07/02
75/11/04
TIME DEPTH
OF
DAY FEET
14 05
14 05
14 05
14 05
14 05
14 05
08 20
08 20
06 20
08 20
08 20
08 20
08 20
08 20
13 00
13 00
13 00
13 00
13 00
13 00
13 00
13 00
ooon
0005
0025
0075
0151
0240
ooon
OOOr.
0030
006S
0100
0140
0180
0220
0000
0005
0030
0070
012*
0160
0200
0240
00010
HATER
TF.MP
CENT
5.5
5.4
5.5
5.2
5.4
5.3
9.8
9.6
9.5
9.2
6.7
4.4
3.6
3.4
11.7
11.6
11.5
11.4
8.4
7.3
5.9
5.6
00300
00
MG/L
9.8
9.8
9.8
9.8
9.8
9.6
8.6
8.8
9.2
9.0
9.8
9.8
10.2
10.0
8.4
8.6
9.0
8.6
10.0
10.4
10.2
10.2
00077 00094
TRANSP CNOUCTVY
SECCHI FIELD
INCHES MICROMHO
600 95
95
V8
92
92
93
67
67
67
67
62
59
57
57
600 73
78
73
72
69
66
66
60
00400
PH
SO
7.85
8.30
7.80
7.90
7.90
7.85
8.10
8.10
H. 10
8.10
8.10
8.10
8.10
8.05
7.80
8.00
e.oo
8.00
8.20
8.30
8.20
8.10
00410
T ALK
CAC03
MG/L
47
47
45
44
45
46
45
44
43
46
45
47
47
48
42
40
41
42
42
42
41
46
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.0?OK
0.020K
0.020K
0.020
0.020K
0.020K
0.020
0.020K
0.020
0.020
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.200K
0.200K
0,?OOK
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.20 OK
0.200K
O.POOK
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.?OOK
0.200K
00630
N02K.NO3
N-TOTAL
MG/L
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.020K
0.030
0.020K
0.020K
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00671
PHOS-OIS
O»THO
Mfi/L P
0.012K
0.004J
0.009K
0.009K
0.010K
0.003J
0.011K
0.010K
0.011K
0.002
0.002K
0.002K
0.002K
O.OORK
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.002
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
RETRIEVAL OflfE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
/TYPA/AM8NT/LAKE
320507
39 09 55.0 120 02 05.0 3
LAKE TAHOE
06061 NEVADA
150191
11EPALES 04001002
0999 FEET DEPTH CLASS 00
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
75/03/24 14 05 0000 0.008
14 05 0005 0.006
14 05 0025 0.007
14 05 0075 0.007
14 05 0150 0.007
14 05 0240 0.006
75/07/02 08 20 0000 0.005
08 20 OOOS 0.005
03 20 0030 0.006
08 20 0065 0.005
08 20 0100 0.005
08 20 0140 0.005
08 ?0 0180 0.005
08 20 0220 0.005
75/11/04 13 00 0000 0.004
13 00 0005 0.003
13 00 0030 0.003
13 00 0070 0.004
13 00 0126 0.003
13 00 0160 0.003
13 00 0200 0.004
13 00 0240 0.003
32217
CHLRPHYL
A
U6/U
0.5
0.5
00031
INCOT LT
RFMNING
PERCENT
0.4
-------
STOPET RETHIEVAL DATE 77/01/2H
NATL EUTROPnlCATIOf. SURVEY
EPA-LAS VEGAS
/TYPA/AMBNT/LAK<:
DATE
TO
75/03/24
75/11/04
00010
TIME OEPTu WATER
OF T£MP
DAY FEET
14
14
14
14
14
14
14
10
10
10
10
10
10
10
10
05
05
05
OS
05
05
05
15
15
15
15
15
15
15
15
0000
0005
0025
0075
0125
0175
0225
0000
0005
0030
0070
0114
0160
0200
0240
CENT
4.S
4.S
4.S
4.4
4.4
4.S
4.4
11.5
11. b
11.4
11.?
10.7
6.7
5.8
5.4
320508
39 07 37.0 120 07 35.0 3
LAKE TAHOE
06061 NEVADA
150192
11EPALES 0*001002
0999 FEET DEPTH CLASS 00
00300
DO
MG/L
9.8
9.6
9.S
9.6
9.6
9.6
10.0
9.2
8.4
8.6
8.8
9.0
9.8
9.8
9.2
00077
TRANSP
SECCHI
INCHES
425
600
00094
CNDUCTVY
FIELD
M1CROMHO
95
93
92
93
94
96
77
79
76
76
73
66
64
63
00400
PH
SU
8.90
7.60
7.80
7.40
7.50
7.20
7.70
7.90
8.00
8.00
8.00
8.00
7.90
7.20
7.60
00410
T ALK
CAC03
MG/L
41
40
42
56
55
54
51
42
44
41
40
37
34
34
36
00610
NH3-N
TOTAL
MG/L
0.020K
0.0?. OK
0.020K
0.0'OK
0.020K
0.0'OK
0.020K
0.0?.OK
0.0?OK
0.0?OK
0.020K
0.020K
0.0?OK
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200*
0.200*
0.200K
0.?-OOK
0.200K
00630
NO
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATIO'I
EPA-LAS VEGAS
/TYPA/AMBNT/I.4KE
00010
DATE
FRO"
TO
75/03/24
75/07/02
75/11/04
TIME DEPTH *ATER
OF
DAY
15
15
15
15
15
15
15
07
07
07
07
07
07
07
07
07
09
09
09
09
09
09
09
FEET
15
15
1*3
15
15
15
15
SO
sn
50
50
50
50
50
50
50
30
30
30
30
30
30
30
0000
000^
0025
0050
0090
Olftfi
0190
0000
ooos
0020
0040
0060
0080
0120
0160
0200
0000
0005
0030
0075
0117
0170
0216
Tt MP
CENT
4.6
4.5
4.5
4.5
4.5
4.4
4.4
11.2
11.?
11.2
11.2
11.7
6.8
5.2
4.5
3.5
11.5
11.5
11.5
11.5
10.2
7.0
5.4
320509
39 13 45.0 130 02 03.0 3
LAKE TAHOE
06061 NEVADA
11EPALES 04001002
0194 FEET DEPTH CLASS 00
00300
DO
MG/L
9.4
9.6
9.6
9.4
9.6
9.6
9.6
9.0
8.4
8.6
8.6
9.6
10.0
10.0
10.0
8.4
8.6
8.6
8.6
11.0
9.4
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
420 94
95
95
96
94
92
109
240 80
81
77
79
55
70
58
55
58
600 90
95
97
94
119
120
94
00400
PH
Sll
7.80
7.90
7.60
7.50
7.70
7.90
7.80
B.OO
8.10
8.10
8.10
«.10
8.10
8.15
8.20
8.10
7.90
7.90
8.00
7.95
8.10
8.20
7.90
00410
T ALK
CAC03
MG/L
51
50
50
53
53
53
53
53
53
56
55
54
53
52
53
53
35
35
36
39
38
40
38
00610
NH3-M
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.040
0.030
0.020
0.020
0.030
0.020
0.030
0.030
0.020
0.020K
0.020K
0.020K
0.0?OK
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.200
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.300
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.?OOK
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.020*:
0.020K
0.020K
0.020K
0.020K
o.«2nK
0.020K
0.0'PK
0.020K
0.020K
0.020K
0.n2QK
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020*
00f>71
PHOS-DIS
0«THO
MG/L P
0.005J
0.004J
0.003J
0.009K
0.010K
0.004J
O.OO^J
0.009
0.004
0.003
0.002
0.003
0.002
0.003
0.002
0.00?
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STO^cT RETRIEVAL JATE 77/01/26
MAIL EUTHOPHlCATIQfM SURVEY
EPA-LAS VEGAS
330589
3^ 13 45..0 120 03 03.C 3
LAKE TAHOE
06061 NEVADA
1510191
11EPALES 04001003
0194 FEET DEPTH CLASS 00
DATE
FPQM
TO
75/03/24
/5/07/02
75/11/04
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPNYL INCDT LT
OF
DAY
15
15
15
15
IS
15
15
07
07
07
07
07
07
07
07
07
09
09
09
09
09
09
09
FEKT
15
15
15
15
15
15
15
50
50
50
50
50
50
50
50
50
30
30
30
30
30
30
30
0000
0005
0025
OObO
0090
01*0
01VO
0000
0005
0020
0040
0060
0080
0120
0160
0200
0000
0005
OOJO
0075
0117
0170
021*
A RFMNING
I*G/L P UG/L PEHCENT
0.007 0.5
0.006
0.007
0.006
0.006
0.005
0.007
0.014 0.3
0.009
0.008
0.009
0.007
0.008
o.ooe
0.008
0.010
0.003 0.4
0.003
0.003
0.007
0.003
0.003
0.003
-------
ST03ET RETRIEVAL DATE 77/01/36
MAIL Fl'TNOPHICATION SURVEY
EPA-LAS VEGAS
/TYPA/AMBNT/LAKE
DATE
FROM
TO
75/03/24
75/07/02
75/11/04
TIME DEPTH
OK
DAY FEET
14 45
14 45
14 45
14 45
14 45
14 45
14 45
14 45
08 30
08 10
OS 30
13 30
08 30
08 30
08 30
08 30
08 30
08 30
08 45
08 45
08 45
08 45
08 45
08 45
08 45
n« 45
0000
0005
0025
0050
0100
0150
0200
0240
0000
0005
0020
0040
0070
0100
0120
0150
0180
0210
0000
0005
0030
0070
010S
0150
0195
0240
00010
WATER
TtMP
CENT
5.4
5.4
5.4
5.4
5.3
5.3
5.3
5.3
11.8
11.7
11.6
10.8
8.4
6.3
5.7
4.7
4.7
4.2
11.6
11.6
11.6
11.5
11.4
9.8
7.8
7.1
320510
39 14 OOoO 119 57 40.0 3
LAKE TAHOE
32031 NEVADA
150191
llEPAL.es
04001002
0999 FEET DEHTH CLASS
00300.
DO
MG/L
9.8
9.6
10.0
10.0
10.0
9.8
9.6
9.8
8.4
8.6
8.4
8.5
9.8
9.4
9.6
10.0
10.0
8.6
9.0
a. 6
8.8
8.5
9.4
8.2
10.0
00077 0009*
TRANS" CNOUCTVY
SECCHI FIELD
INCHES MICROMHO
600 93
94
95
93
91
94
Sb
95
240 7S
77
78
75
69
69
55
54
64
60
600 89
87
91
92
93
90
90
94
00400
PH
SU
7.80
7.90
7.85
8.10
7.80
7.70
7.90
7.70
8.10
8.10
8.10
8.20
8.15
8.20
8.20
8.15
8.20
8.15
7.65
7.80
7.80
7.85
7.90
7.90
7.90
7.90
00410
T ALK
CAC03
MG/L
47
48
48
50
50
56
52
55
53
51
54
53
51
55
54
55
55
53
41
39
40
42
44
36
35
34
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.0?OK
0.030
0.040
0.020
0.030
0.020
0.030
0.020
0.030
0.020
0.030
0.020K
0.020K
0.020K
0.0?OK
O.OPOK
0.020K
0.020K
0.020K
00
00625
TOT KjEL
N
MG/L
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.0?OK
0.0?OK
0.020K
0.020K
0.0?OK
0.020K
0.020K
0.020K
O.OIOK
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
O.H20K
0.020K
0.020K
0.020K
0.020K
O.Oe>OK
0.020K
0.020K
0.020K
0.020K
00671
PhOS-DIS
OPTrtO
Mfi/L P
O.OOSJ
0.010K
O.OIOK
0.010K
0.009K
0.014K
0.013K
0.005J
0.010
0.004
0.003
O.OIOK
0.011K
0.005
0.005
0.005
0.004
0.003
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUTROPHICATION
EPA-LAS Vr.ftAS
/TYPA/AMBNT/L^KE
330510
39 14 00.0 119 57 40.0 3
LAKE TAHOE
32031 NEVADA
150191
11EPALES 04001002
0999 FEET DEPTH CLASS 00
DATE
FROM
TO
75/03/24
75/07/02
75/11/04
00665 32217 00031
TIMf OEUTH PHOS-TOT CHLRPHYL INCDT LT
OF
nav
14
14
14
14
14
14
14
14
08
08
0«
03
ne
08
08
08
oe
08
08
08
08
08
08
OP
OH
OH
FEET
45
45
45
4b
45
45
45
45
30
10
30
30
30
30
30
30
30
30
45
45
45
45
45
45
45
45
0000
0005
0025
0050
0100
0150
0200
0240
0000
0005
f>0?0
0040
0070
0100
0120
0150
0180
0210
0000
0005
0030
0070
0105
0150
01*S
024C
A 9EMMNG
MG/L P UG/L PEWCENT
0.007 0.7
0.006
0.006
0.006
0.007
0.008
0.007
0.006
0.015 0.3
0.010
0.008
0.008
0.007
0.007
0.007
0.008
0.008
0.007
0.003 0.5
0.003
0.003
0.003
0.003
0.003
0.004
0.004
-------
APPENDIX D
TRIBUTARY AND HASTEWATER
TREATMENT PLANT DATA
-------
77/01/22
- i AS
/T
UftTF
TO
74/]
7H/01/lt>
TI«t OtPT-i .MO?\N03
OF
PAY FEET
'14/1 7
75/1,7/03
75/10/OS
11
11
10
13
10
12
12
13
11
11
10
1?
12
1?
13
SO
11
40
30
30
2fi
30
51
45
40
40
00
3205A1
39 10 00.0 1*0 OH 33.0 4
THUCKEE wivt*
3? 7.b TAhOF CITV
0/LAKE TAHQf 150142
HKOti 6ELO 0AM ON MKY ft9 .* •« •>•< OF TAHOt"
11EP6LLS 04001004
oooo FEET OE^TH CLASS on
i0630
'\N03
r.TAL
",/L
j.on-
0 . 0 ft M
0.01?
".OOS
O.OOS
0.00^
n . o o s
o . o i n
c.oos
0 . 0 0 s
ft . 0 1 S
i. . 0 1 •->
o.oos
o.oos
o . o i n
006^5
TOT KJEL
N
MC,/L
0.100*
0.100
0.150
0.050
0.100
1.000
0.100
O.OSflrt
0.050
0.100
0.800
1 . 7b<>
0.050
O.lOOrv
0.100K
C0610
NH3-N
TOTAL
MG/L
0.020
0.010
0 ,008n
0 . 0^0
O.Olb
0.005K
0.0 OSK
0.020
O.OOs
o.o nb
0.073
o.0?5
0.005
0 . OObK
00671
PnOS-(
-------
STOcT
.\6Tt_
epA- |. AS VtGAS
77/01/?2
TO
Tlilt HEP!-
OF
r-AV KttT
10 in
,19 4S
13 40
14 20
ft/04/17 !4 30
] 4 0 •'>
15 20
14 £0
7H/08/17 14 4.i
7--/07/03 11 40
12 2?
14 O*1
14 50
75/10/0^ 14 ?0
3h 55 20.0 119 ** 23.n *
Linden TWUCKEF RWEH
3? 7.5 s LIV TAHOE
T/LAKt TAHOE
UN US HT SO 1.3 "I S* OF S TAHOF HS
0400)004
0000 F'tET OEHTH CLASS 00
f'630
%N03
f> T i t.
tt/L
0.0 '40
0.04-!
li . 0 P •)
o.o* n
ij . .3 0 0
0 . n ti M
v) . >.» H 0
U . u s o
c.r; -to
0 .01^
U . 0 f 0
u . o •? i
(1.040
0.03S
11.045
006^5
TOT KJEL
N
"G/L
J.OOO
O.«00
0.100
0.400
0.150
1 1 , M S 0
ii.nsdN
0.400
o.l so
0. ISO
U ,5bO
0.6bO
u.400
O.-IOO
0.1 bO
OOblO
MM3-.J
TOT/L
MG/L
0,030
0.015
0.012
0.035
0.020
0 . 015
0.010
0.020
0.020
0.010
0.120
0.015
0.310
0.01 li
30671
f HijS-OIS
GrvTHfl
«6/L V
0.005
0.005
0.005
0.020
0.005
0.010
0.010
0.005
0.010
0.010
0.005
O.OOS
0.005K
O.OOa
0.010
QQf^t,
PHOS-TOI
MG/L H
0.015K
0.010K
0.01 UK
0.020
0.030
0.010
0.030
0.040
0.040
U.010
0.03C
(1.01 OK
0.010*
0.020
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
:T(j~tT "
A ri_ u:ijT
-p/5- [AS
.'h'.r/- T-- i
riaTc ri^r ,'f-r-
(•"^ll-i Or
10 f; A f * r' - r
'•/I 1/1- 11 V
11 n*
0. i> p j
i;. o ?. «
r,,03^
'i. n?s
';.on
,i .dO1-;
..OOS
o.oos
o.oo^
D.OlO
320bf 1
<* 07 bS.O 1?0 0 BlI S 0»-
04001004
0001 KEPT UEn'Tri CL^SS On
0
w
o2b
*JtL
OOhlO 01*71 0066S
MH3-H) Pni)S-i;IS OnOS-TUT
TOTAL U^THO
G/L <»!>/L (• J/L
0
0
1
U
0
1
1)
II
u
0
u
0
0
0
0
.?on
.^on
.oou
.22S
.300
.'S'-O
.300
,os
.ObOK
.lOOr.
.100*
0
0
0
!)
n
n
n
u
n
0
0
r
0
0
,m
.01-,
.01-3
.010
.010
,unb
.OlD
. 0 1 '-•
.010
.010
0
0
0
0
0
0
0
0
II
0
0
0
0
0
0
.
.
.
.
.
•
.
.
.
.
.
•
.
.
.
p
01S
OOM
fllr.
015
010
010
nio
010
Oi>0
OOb
tlObK
010
010
010
010
«G/
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
I.
•
•
•
•
•
•
•
•
•
•
•
•
•
*
•
»-*
0*0
010
Olb
0^0
030
010
010
010
0?0
010K
010
010
010
040
010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
NflTL F
F ^ o- LAS v 16 A •
3 ON Ort f -^D .-> M N OF TAMOE VISTA ST"
llf-^ALcS 04001004
0000 Fct'T _)EPTH CLASS 00
UATff
K*t)M
TO
7s/o>-!/ IS
75/nb/^*
7b/riK/J7
75/07/03
TivE. Of- • -
.,01
12
11
11
0 ' NO?
•M-T T-iL
-.,/L
•'.Ol.'i
!i . ililc
i ' . 0 n ",
•-I.OO-
0 0 h ^ b
TOT Kj8L
.•\
M (i / 1_
0. IbO
0 . 0 b 0 f.
1 .?->Q
0.100
U0610
Nrt3-M
TOTAL
MG/L
0 . 0 I f-
0.0 In
0.03d
0.01~
00671
PHQS-U1S
U*Ti-0
«,o/u ^
O.OOb
') . 0 1 0
0.0 Ob
o.oos
nof.61^
"HOS-TUT
MG/L ^
0.01 OK
o.oiu
0.01 OK
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 77/01/33
MATL EUTrfOPHICATION SURVEY
EPA- LAS VE6AS
/TYPA/AM6NT/STPEA*
3205D1
39 14 25.0 119 56 45.0 4
THIRD CHEEK
32 7.5 MAPLETTE LK
T/LAKE TAHOE 150191
BRDG ON HWY 28 IN SE INCLINE VILLAGE
11EPALES 04001004
0000 FEET DEPTH CLASS 00
DATE
TO
74/11/16
74/12/20
75/01/18
75/02/26
75/03/31
75/04/17
75/04/30
75/05/15
75/05/28
75/06/17
75/07/03
75/07/28
75/08/27
75/09/26
75/10/09
00630 00625
TIME DEPTH N02KN03 TOT KjEL
OF N-ToTAL N
DAY FEET
10
13
09
11
10
10
11
11
11
14
09
10
10
11
11
00
20
23
05
00
50
20
40
10
30
15
40
30
20
00
MG/L M
-------
STORET RETRIEVAL U4TE 77/01/22
NATL EUTROPHICftTIO'N SURVEY
fcPA- LAS VEGAS
/TYPA/AMBNT/3T»EAM
DATE TIME DEPTH N02S.N03
FROM OF
TO DAY FEET
75/03/31 09 20
75/04/17 10 50
75/04/30 11 20
76/05/15 11 30
73/05/28 11 00
7S/U6/17 14 25
75-/07/03 09 in
75/07/28 10 30
3205E1
39 14 10.0 119 55 55.0 4
MILL CREEK
32 7.5 MARLETTE LK
T/LAKE TAHOE 1501S1
SEC RD 8RDG .5 MI 6ELO INCLINE VLG STP
11EPALES 04001004
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
G/L
0.105
0.010
0.030
0.025
0.010
0.005
0.010
0.005
00625
TOT KJEL
N
MG/L
0.150
0.300
0.500
0.250
O.SOO
1.^00
0.650
1.450
00610
VJH3-N
TOTAL
MG/L
0.0?5
0.015
0.270
0.055
0.010
0.030
0.050
0.035
00671
PHOS-DIS
OHTHO
MG/L P
0.035
0.030
0.030
0.020
' 0.020
0.020
0.015
0.025
00665
OHOS-TOT
MG/L P
o.oao
0.100
0.060
0.060
0.040
0.020
0.025
-------
STO=»ET RETRIEVAL OS
NATL EUTHOPblCATIO'1
- LAS VE
-------
PtTRIEwAL DATE 7T/01/22
NATl. FUTROPHICATION SURVEY
EPA- I AS VEGAS
/TYPA/Af'BNT/STREA.M
DATE TIME DEPTH N02&.N03
FRO* OF
TO DAV FEET
74/11/17
74/12/80
75/01/18
75/n?/26
75/03/17
75/OJ/31
75/04/30
75/05/15
75/OS/dB
75/0^/17
75/07/03
75/07/26
75/08/27
75/09/26
75/10/09
11 05
09 50
14 30
13 20
15 30
14 20
15 00
11 00
15 20
14 00
12 40
15 20
10 10
16 00
14 50
3205G1
39 06 10.0 119 56 40.0 *
SLAUGHTERHOUSE CYN CRK
32 7.5 GLENBROOK
T/LAKE TAHOE 150191
BRDG ON ORT RD 1 MI NW OF GLENBROOK
11EPALES 04001004
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
IG/L
0.032
0.040
0.124
0.145
0.230
0.180
0.220
0.260
0.075
0.050
0.075
0.050
0.070
0.065
0.075
00625
TOT KJEL
N
MG/L
0.500
1.800
0.650
0.850
1.750
0.700
0.450
0.950
0.850
1.300
0.900
0.800
0.637
1.900
0.500
00610
Nrt3-N
TOTAL
MG/L
0.050
0.040
0.056
0.135
0.100
0.075
0.075
0.055
0.015
0.040
0.015
0.025
0.015
0.095
0.020
00671
PMOS-DIS
OKTHO
MG/L P
0.010
0.010
0.010
0.010
0.022
0.020
0.031
0.020
0.020
0.025
0.0?0
0.015
0.020
0.015
0.015
00665
PHOS-TOT
MG/L P
0.020
0.030
0.025
0.040
0.040
0.060
0.050
0.050
0.070
0.140
0.090
0.030
.0.050
0.050
0.040
-------
"AIL
/T VPA/AV-3NT/STREAM
320bJl
38 55 55.0 119 515 &0«0 «•
TROUT CREEK
32 705 S LK 7AHOE
Y/LAKE TftriOE 150191
BKUG ON US RT 50 .6 MI S OF S TAHOE HS
11EPALES 0400100*
oooo FEET DEHTH CLASS oo
DATE
FhiO*
TO
74/11/17
74/12/^0
7S/01/1S
75/02/26
7S/03/31
75/04/17
75/04/30
75/U5/15
75/1)5/2^
7b/(^/17
/5/i»7/n -.
75/07/2^
75/0^/2^
75/10/09
TI"E OEPTh
Of-
DAY FEET
09
10
11
12
l^i
14
1*-
15
14
!->
11
14
1^
14
40
10
20
35
00
30
00
3(1
30
00
45
40
10
35
00630 OO'j^
- N02sN03 Tf.T KjEL
N-TdTAL .J
MG/L
0
0
d
n
0
0
0
0
0
0
0
0
0
0
.040
.(IAS
.OS*
0 41--
.070
.060
.100
.075
.035
.010
.025
.025
.030
.030
MG/L
0.
n.
0.
0.
U.
2.
0.
0.
0.
0.
0.
0.
D.
0.
20i.
lOu
250
2on
300
800
350
550
20d
6b()
150
100
100
100
OOMO 00671 OQf>65
Nn3-N PHOS-OIS PMOS-TOT
TUTtL OKThO
MG/L
0.
0.
0.
0.
0.
0.
0.
U.
0.
0.
0.
0.
0.
0.
050
020
008
020
057
020
040
045
0?0
065
010
010
d!5
005
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
H
010
010
010
020
015
010
015
010
030
010
010
010
010
010
MG/L f-
0.010
0.010
0.025
0.070
0.070
0.040
0.030
0.050
0.040
0.020
0.030
0.032
0.030
0.040
-------
fill.
if 56 00.0 l2/2r»
75/03/J1
75/f)4/17
75/04/30
7S/P5/15
75/'i3/£H
7^/1:^/1 7
7 r / " 7 / 0 3
75/'!7//'K
7^/'i»l/f>7
7^/04/8^
/ -. / 1 0 / 0 3
HAY FE£T
10
1''
1 f
13
13
14
13
15
13
1"
11
14
1*
14
13
20
45
on
30
00
30
40
in
on
?A<
30
00
20
00
bn
00030 Oo
•• N025.M03 TOT
N-TOTAL N
M6/L
i)
0
0
0
0
0
0
0
0
n
0
0
0
0
0
.12^
.040
.016
.005
.010
.005
.005
.005
.005
.005
.020
."50
.015
.005
.00^
KJtL
MG/L
,i
2
0
0
0
1
0
n
0
0
n
0
0
i
0
.100
. 100
.100K
.200
.150
.950
.107
.200
.350
.050
.150
.600
.050
.400
.100
0 0 HOb~01S PHOS-TOT
UnThO
MG/L f
0
0
0
0
0
0
0
0
0
n
n
0
0
0
0
.005K
.010
.005K
.005K
.005K
.005K
.005K
.00^*
.010
• 005K
.005*
.005K
.005K
.005K
.005*
M6/L P
O.OlU
0.010
0.01 OK.
0.010K
0.010K
0.040
0.010K
0.020
0.010
0.010K
0.010K
0.040
0.010
0.010K
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
EUT-iOPrtlCATIO'. -> >-v£Y
FPA- LAS VtbAS
3205N1
39 03 10.0 120 07 00.0 4
GENERAL C*EEK
32 7.5 MEEKS BAY
T/LAKE TAHOE 150191
BHD(i ON HrfY 89 1.1 MI NE OF MUEKS bAY
HEHALES 0400100*
0000 FEET OEf'TH CLASS 00
Fr- )*
T'J
74/1 1/17
74/15/20
75/0 1/18
75/f'2/26
75/o V31
f5/o<»/17
'5/->/2f
f5/0a/17
75/07/03
7S/n63P 00625
TI'"E DEPT" M>:>*.N03 TOT KJEL
uf- N- TOTAL N
DA" FEET "1ti/L
1 1
11
11
13
12
1J
13
14
12
13
11
13
13
13
13
on
20
00
on
on
10
no
20
10
00
on
20
20
30
20
0
0
0
0
U
0
0
0
0
n
0
0
0
0
0
.00*
,uo»
.0?*
.02n
.03n
.Ols
,01-S
.0?^
.00^
.OOH
.(t?fi
.010
.00^
.00=5
.OOS
MG/L
0.
1.
0.
0.
0.
1.
0.
0.
0.
0.
0.
0.
0.
1.
0.
100
300
100K
050
400
000
200
250
050x
150
750
100
65U
400
100
00610 OOf-71 00665
MH3-N PHOS-uIS PnOS-TOT
TOTAL 0»TMO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
020
035
016
015
015
010
020
045
025
010
030
020
015
0*0
005
.MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
p
UlS
010
010
010
005
010
010
005K
OOSr,
005K
fi05K
010
015
015
015
MG/L P
0.030
0.010
0.010
0.010
0.020
0.010
O.U20
0.010K
0.010*
0.010K
0.020
0.015
0.030
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
F.»A- LA? VEGAS
04 3,5.0 120 06 33.0
CREEK
3c; 7.5 HOftfc'OOO
T/LAKE TAnOE
8ROG ON H«IY 49 .S MI * OF TAHOMA
HEPALE.S 0400100*
0000 FEET DEPTH CLASS 00
DATE
hxO1"!
TO
74/11/1*
74/12/20
7S/01/18
76/02/26
75/03/31
75/04/17
75/04/30
7D/05/15
7b/05/2H
7^/06/17
7S/07/03
7^/07/28
7S/OH/27
7^/04/26
75/10/00
TIME DEPTH
OF
DAY
11
11
11
12
11
13
12
14
12
12
11
13
13
13
13
00630
•MO?NN03
N-TufAL
FEET
15
30
00
55
50
20
40
00
00
*0
00
10
00
20
25
*G/L
0.
('.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
024
04-
05ft
081
13^
120
10n
11 ^
040
01-^
ogn
070
03^
040
Olb
00625
TOT KJEL
N
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
500
900
700
250
450
BOO
050K
150
100
200
150
300
250
100K
150
00610
MH3-N
TOTAL
Mb/L
0.035
0.0?0
0.008
0.020
0.105
0.020
0.005
0.035
O'.0l5
0.010
0.010
0.030
0.005K
0.005
O.OOSK
00671
PHOS-DIS
00665
OHOS-TOT
OKTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
p
005*
005*
005
005*
005K
005*
005*
005*
G05K
005*.
005
005
005*
005K
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
.010
.01 OK
.010K
.010*
.020
.010K
.010
.010*
.010
.010K
.010K
.030
.010K
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
77/01/33
SURVEY
VEGAS
320510
39 19 20.0 120 0* 15.0 4
JUNIPER CKEEK
32 7.5 "ArtTIS PEAK
T/LAKE TAHOE 150191
UNIMPROVED fiO XING .4 M SE OF HlHSCHOALE
11EPALES 04001004
0000 FEET DEPTH CLASS 00
OfiTF
FC>0"
TI."E Ot°T'
OF
rn DAY FFET
r^/
7*/
11/17
12/20
75/01/1*
7b/
o?/26
0 * / 1 7
75/04/30
75/06/17
7b/
7s/
7*>/
7r>/
v7/0^
t)7/*!H
HB/27
-,•-»/ 2 f5
10 /OS
12
12
10
17
11
1 1
19
11
10
12
11
12
12
4(1
30
1s,
30
SO
bO
00
3fi
10
00
30
IS
10
00630 00625
i NO2«,N03 TOT KjEL
N-TUTAL N
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
00=1
03P
024
01^
050
090
025
010
010
015
005
005
005
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
200
600
400
800
750
350
750
300
387
850
050
100K
400
00610 00671 00665
Nh3— M PHOS-OIS PHOS-TOT
TOTftL OWTnO
MG/L
0.0*5
0.0?4
0.00*
0.0?0
O.Olb
0.010
o.o ?s
0.027
0.195
0.035
fi.0n5<
O.OibK
0.040
MG/L P
ri
0
0
0
0
0
n
0
0
0
0
.015
.016
.025
.015
.015
.015
.015
.025
.025
.020
.020
MG/L P
0.020
0.020
0.012
0.080
0.030
0.040
0.030
0.040
0.050
0.030
0.080
0.020
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
'lATL
LPA- LAS VEGAS
/TYkA/AMBNT/STPFAM
DATE
FhOM
TO
74/11/17
74/12/20
75/01/18
7S/04/17
75/OS/01
75/05/15
TIME OEPT"
OF
DAY FFET
11 SO
14 on
15 00
16 00
11 30
10 40
NO?k.N03
N-ToTAL
MW/L
O.OOP
0.03?
o.oso
0.020
o.oos
o.07n
oo^zs
TOT KJEL
MG/L
0.100K
0.200
0.200
1.150
0.050K
0.150
00610
NH3-N
TOTAL
MG/L
0.0?2
O.GP4
O.n?4
0.020
0.005K
00671
PHOS-r>IS
OR! HO
MG/L P
0.005
0.008
0.010
0.005
0.035
0.010
32051T
38 57 55.0 119 50 55.0 4
DAGGtTT CREEK
32 7.5 MINDEN
T/LAKE TAMOE 150191
8NK SAMP .5 MI w Of-' JCT «»TH FOOTHILL
11EPALES 04001004
0000 FEET OEHTM CLASS 00
00665
PHOS-TOT
MG/L P
0.010
0.010K
0.014
0.070
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
NATL EUTHOPHICATIj,
EPA- LAS VEGAS
/TYPA/ArH\T/ST«FA 1
OflTE
FOQM
TO
74/1 1/17
74/13/20
75/ni/ie
75/03/31
75/U4/30
75/05/01
75/05/16
75/'i5/2H
76/^6/20
75/07/04
75/07/2H
75/od/31
/5/ )'5/26
TIME OfcrT
OF
CCY
17
14
15
16
11
10
14
16
11
12
11
10
11
FEtf
31
35
3"
00
00
00
00
00
30
00
00
5'J
00
J2051U
38 04 15.0 119 50 50.0 4
UNNAMED CPK IN *Trt CYN
33 7.5 GENOA
T/LAKE TAHOE 141091
UNIMPROVED RD XING 5.75 MI N OF GENOA
11EPALES 0*001004
0000 FEET DEPTh CLASS 00
7b/10/04
06 in
f.N03
TT&L
G/L
n . 0?4
U . 0?i
0.024
0.030
0.010
0.01S
il.030
0.030
0 . 0 1 0
H . 0 1 0
o.om
0.03S
0.010
0.01S
0063?
TOT KJEL
N
MG/L
0.1 00",
0.800
1.250
U.450
0.050*
l.«5()
0.750
0.100
0.350
0.050
0.100
0.100K
0.300
00610
MH3-N
TOTAL
MG/L
0.010
0.024
0.016
0.025
0.005*
0.005
0.020
0.025
0.005i\
0.040
0.015
0.005K
0.010
0.005
00671
PHOS-UIS
ORTHO
MG/L M
0.035
0.024
0.037
0.030
0.030
0.005
0.0 75
O.OSb
0.030
0.030
0.035
0.040
0.030
O.OJO
00665
PHOS-TOT
MG/L P
0.030
0.030
0.040
0.030
0.030
0.060
0.050
0.060
0.120
0.080
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
<
c
(
(
(
STORE! RETRIEVAL UfiTt 77/01/22
NATL EUTROPHICATIJN SURVEY
EPA- LAS VEGAS
/TYPA/AM6NT/ST*F.«-i
3205*1
39 14 30.0 120 01 45.0 4
GR1TT CREEK
32 7.6 KINGS BEACH
T/LAKE TAHOE 150191
100 YDS E OF HWY 267 IN KINGS BEACH
11EPALES 04001004
0000 FEET DEPTH CLASS 00
OATE
FROM
TO
74/11/17
74/12/20
75/01/18
75/02/26
75/03/31
75/04/17
75/05/01
75/05/15
75/05/28
75/06/17
75/07/03
75/07/28
75/08/27
75/09/26
75/10/09
TIME OFPTH
OF
DAY FEET
14 20
13 10
09 35
10 50
10 00
11 00
11 30
12 10
11 2b
11 15
09 30
11 40
10 45
11 30
11 10
00630
N02sN03
N-TOTAl.
MG/L
O.OOa
0.003
0.024
0.020
0.030
0.025
0.035
0.035
u.oin
0.005
0.010
0.015
0.015
0.020
0.005
00625
TOT KJEL
N
MG/L
0.100K
0.500
0.600
0.800
0.450
0.950
0.050K
0.700
0.050K
1.050
0.250
0.300
0.100
0.400
0.100
00610
NH3-N
TOTAL
MG/L
0.005
0.016
0.016
0.025
0.015
0.010
O.OObK
0.035
0.020
0.020
0.025
0.020
0.005K
0.080
0.005K
00*71
PHOS-UIS
ORThO
MG/L P
0.010
0.008K
0.010
0.005
0.005
0.010
0.010
0.011
0.005
0.010
0.010
0.010
0.050
0.010
00665
PHOS-TOT
MG/L P
0.010
0.010
0.015
0.020
0.010
0.030
0.010
0.090
0.030
0.010
0.010
0.020
0.010
0.070
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
\ATL tUTHOPhlCATIO
EPA- LAS VEGAS
/TYPA/AMBNT/STf?£AM
SURVEY
3205X1
38 57 55.0 119 56 10.0 4
EDGEWOOD CREEK
32 7.5 LK TAHOE S
T/LAKE TAHOE 150191
US RT 50 BRDG 0.5 MI ME OF STATELINE
11EPALES 04001004
0000 FEET DEPTH CLASS 00
OATE
TO
74/11/17
74/12/23
75/01/18
75/02/26
75/03/31
75/0<»/17
75/05/01
75/05/15
75/05/28
75/06/17
75/07/03
75/07/28
75/08/27
75/H9/26
75/10/09
00630 00^25
TIME DEPTH NO??,N03 TOT *JEL
OF N-TOTAL N
DAY FEET
09
10
13
14
14
15
15
16
15
13
12
15
16
15
14
15
10
50
30
00
00
30
00
00
30
00
00
00
30
45
W/L
il.
0.
0.
0.
0.
0.
0.
0.
n.
0.
0.
0.
0.
0.
0.
032
044
048
050
08S
065
07=;
08S
05S
065
035
050
040
030
030
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.300
.200
.100K
. 150
.250
,d50
.050*
.300
.650
.350
.400
.100
.100
.100K
.200
00610 00671 00665
NH3-H PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
020
020
032
055
020
050
030
015
020
025
010
010
020
025
005K
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
010
015
015
015
015
015
015
015
010
015
015
020
015
015
MG/L f
0.020
0.030
0.030
0.070
0.060
0.030
0.040
0.050
0.040
0.080
0.020
0.040
0.020
0.030
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STCH 1 « TV V L T Xr,i
NATL tUTROPHlCATIOM SURVEY
EPA- LAS VEGAS
/TYP A/AMtJNT/STREAM
3205Y1
38 55 05.0 119 50 30.0 *
HEAVENLY VALLEY CREEK
32 7.5 LK TAHOE S
T/LAKE TAHOE 150191
2 M S OF STATELINE AT PIONEER TRL RD XNP
11EPALES 04001004
0000 FEET DEPTH CLASS 00
DATE
TO
74/11/17
74/12/20
75/01/18
75/02/26
75/03/31
75/04/17
75/05/01
75/05/15
75/^5/2*
75/"b/17
75/07/03
75/07/28
75/08/27
75/09/26
75/10/09
00630 00625
TIME DEPTH N02&.N03 TOT KJEL
OF N-TOTAL N
OAr FEET
10
10
12
14
13
14
15
15
14
15
11
14
15
15
14
50
30
30
on
30
40
30
40
3b
10
SO
3D
40
lb
30
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.490
.624
.702
.770
.670
.840
.525
.280
.185
.045
.085
.170
.240
.30n
.290
MG/L
0.
1.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
500
800
200
200
050
800
050K
200
300
650
050K
050*
050K
100K
200
00610 00671 00665
MH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
070
048
024
135
010
030
015
010
010
0?0
010
005
005K
030
005
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
005
007
010
010
005
005
005
010
015
015
005
005
010
005
005
MG/L P
0.010K
0.010
0.010
0.020
0.010
0.010
0.010K
0.080
0.030
0.010
0.020
0.020
0.050
0.010K
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
NATL
EPA- LAS VEGAS
/TYPA/AM8NT/STREAH
3205Z1
39 00 52.0 120 07 15.0 *
LONELY GULCH CREEK
32 7.5 MEEKS BAY
T/LAKE TAHOE 150191
HWY «9 RO XIMG 2 MI S MEEKS BAY
11EPALES 04001004
oooo FEET DEPTH CLASS no
TIME DEPTH
DATE
FROM OF
TO DAY FEET
74/11/17 10 50
74/13/20 11 10
75/05/15 14 40
75/05/38 12 20
75/06/17 13 10
75/07/03 11 10
75/07/28 13 40
75/08/27 13 30
75/10/09 13 40
00630
NU2&N03
N-TpTftl
MG/L
O.OOSK
0.0?4
0.070
0.02S
0.010
0.005
0.010
0.00 =
0.00=
006?3
TOT KJEL
N
MG/L
1.200
2.300
0.600
0.050*
0.150
0.650
0.100
0.050K
0.100
C0610
NH3-N
TOTAL
MG/L
0.010
0.040
0.015
0.010
0.005
0.010
0.005
0.005K
O.OOSK
00671
PHOS-D1S
ORTHO
MS/L P
0.005K
0.008K
0.005K
0.005
0.010
0.005K
0.005K
0.005K
0.005K
00665
OHOS-TOT
MG/L P
0.010K
0.010K
0.030
0.020
0.010
0.010K
0.010K
0.010K
0.010K
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
(_ =UT-
-------
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 a^ values are expressed in jag/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.
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE
3201
3202
3204
LAKE NAME
L/'KE MEAD
LAHOXiTAN RESERVOIR
RYE PATCH RESERVOIR
3205 LAKE TA.HOE
3206 TOPAZ RESERVOIR
3207 UPPER PAHRANGAT LAKE
WASHOE LAKE
WILD HORSE RESERVOIR
3208
3209
3210 .l.'ILSON RESERVOIR
3211 UAL:;ER LAKE
MEDIAN '
TOTAL P
0.016
0.19S
0.094
0.005
0.057
0.173
0.403
0.114
0.049
0.602
MEDIAN
I.'-IORG N
0.240
0.350
0.050
C.040
0.165
0.125
0.130
0.320
0.120
0.080
500-
ME/»N SEC
265.565
472.083
467.750
-3.269
376.000
470.000
494.555
439.400
197.333
405.333
MEAN
CHLORA
3.111
4.608
4.933
0.571
7.517
—
11.633
75.530
10.033
3.422
15-
MIN DO
11.400
10.400
10.000
10.200
14.500
3.600
7.200
14.600
11.400
15.000
';EDIA\
DIS5 OPJHO P
I.C35
J . 143
:.G39
:.:o3
:.C4i
;.026
j.263
C .065
:.oie
:.574
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE. UArlE.
3201 LAKE MEAD
3202 LAHON'TAN RESERVOIR
3204 RYE PATCH RESERVOIR
3205 LAKE TAHOE
3206 TOPAZ RESERVOIR
3207 UPPER PAHRANA3AT LAKE
3203 WASHOE LAKE
3209 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.NORG
11 (
0 (
39 (
100 (
33 (
56 (
44 (
22 (
67 .{
78 (
N
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)
f'.EAN
CHLORA
88 (
63 (
50 (
100 (
38 (
13 (
0 (
25 (
75 (
7)
5)
4)
8)
3)
1)
0)
2)
6)
15-
MIH DO
39 (
56 (
78 (
67 (
17 (
39 (
100 (
17 (
39 (
0 (
3)
5)
7)
6)
1)
3)
9)
1)
3)
0)
MEDIAN
::ss ORTHG P
& (
22 (
35 (
ICO (
44 {
57 •
/
-- V
23 (
• z> \.
: (
8)
2)
5)
9)
4)
.6>
1)
3)
7)
0)
------- |