U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE POWELL
COCONINO COUNTY, ARIZONA
GARFIELD, KAf€, /W)
SAN JUAN COUNTIES. UTAH
EPA REGIONS VIII & IX
WORKING PAPER No. 733
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
LAKE POWELL
GOCONINO COUNTY, ARIZOW
GARFIELD, KANE, Af)
SW JUAN COUNTIES, UTAH
EPA REGIONS VIII ft IX
WORKING PAPER No. 733
WITH THE COOPERATION OF THE
ARIZONA STATE DEPARTMENT OF HEALTH
AND THE
ARIZONA NATIONAL GUARD
AUGUST, 1977
-------
REPORT ON LAKE POWELL
COCONINO COUNTY, ARIZONA
GARFIELD, KANE, AND SAN JUAN COUNTIES, UTAH
EPA REGIONS VIII & IX
by
National Eutrophication 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. 733
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
August 1977
-------
1
CONTENTS
Page
Foreword i i
List of Arizona Study Lakes 1v
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 5
IV. Nutrient Loadings 30
V. Literature Reviewed 33
VI. Appendices 34
-------
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 1n 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
planning [§303(e)], 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.
-------
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 refine-
ment 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 Arizona State Department
of Health for professional involvement, to the Arizona National
Guard for conducting the tributary sampling phase of the Survey,
and to those Arizona wastewater treatment plant operators who
provided effluent samples and flow data.
The staffs of the Bureau of Water Quality Control, Environ-
mental Health Services, Arizona State Department of Health, and
the Arizona Game and Fish Department, provided invaluable lake
documentation and counsel during the Survey, reviewed the pre-
liminary reports and provided critiques most useful in the
preparation of this Working Paper Series.
Major General John G. Smith, the Adjutant General of Arizona,
and Project Officer Colonel Richard A. Col son, who directed the
volunteer efforts of the Arizona National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
-------
iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF ARIZONA
LAKE NAME
Big Lake
Fools Hollow Lake
Lake Havasu
Luna Lake
Lyman Lake
Lake Mohave
Lake Pleasant
Lake Powell
Rainbow Lake
Theodore Roosevelt Lake
San Carlos Reservoir
COUNTY
Apache
Navajo
Mohave (San Bernadino
in CA)
Apache
Apache
Mohave (Clark in NV)
Yavapai, Maricopa
Coconino (Kane, Garfield,
San Juan in UT)
Navajo
Gil a
Graham, Gila, Pinal
-------
X Uke Sampling Site
} » « V"*
-------
REPORT ON LAKE POWELL, ARIZONA
STORET NO. 0408
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Powell is borderline
between oligotrophic and mesotrophic. Low chlorophyll a^
values, low phosphorus values, and only slight oxygen depres-
sion were observed at open lake stations. Standiford, et al.,
(1973) cite data from Hansmann, Kidd, and Gilbert, who rate
the lower basin as naturally eutrophic based on productivity
studies. For a comparison of Lake Powell's water quality with
other Arizona and Utah lakes see Appendix A.
B. Rate-Limiting Nutrient:
Algal assay results indicate that the reservoir is phos-
phorus limited. Inorganic nitrogen to orthophosphorus ratios
obtained from the lake data are high (N/P > 25/1), suggesting
phosphorus limitation.
C. Nutrient Controllability:
Lake Powell receives water from three major sources, the
Colorado, Green, and San Juan Rivers, and several minor
streams. These rivers were not monitored as part of the Survey,
but some data are available from USGS monitoring stations.
Total phosphorus values in both the Green and Colorado Rivers
-------
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS^
A. Lake Morphometry:*
2
1. Surface area: 653.16 km .
2. Mean depth: 51.0 meters.
3. Maximum depth: 170.0 meters.
4. Volume: 33.304 x 10$ m3.
5. Mean hydraulic retention time: 2 years.
B. Tributary and Outlet:**
1. Tributaries
Name and Location
of Gaging Station
Colorado River
at Cisco, Utah
Green River
at Green River, Utah
(includes San Rafael
River Data)
Dirty Devil River
at Hanksville, Utah
Escalante River
at Escalante, Utah
San Juan River
at Bluff, Utah
Totals
Drainage
Area (km3)
62,678
109,531
9,039
816
59,570
241,634
Mean Flow
(m3/sec)
173.0
175.0
3.5
0.6
41.7
% of Total
43.9
44.4
0.9
0.2
10.6
393.8
100.0
Table of metric conversion—Appendix B.
*BUREC. 1966. All values based on pool elevation of 1128 meters
(3770 feet) above sea level.
**USGS, 1973. Discrepancy between tributary and outlet total drainage
area is due to location of tributary monitoring sites about 100 kilo-
meters above the confluence of the tributary and the lake, and because
the outlet site is approximately 15 kilometers below Glen Canyon Dam.
The difference of 11% between inflow and outflow is due to the rising
pool elevation during the period of record, evaporation, and ground
water recharge into the sandstone bedrock of Lake Powell.
-------
2. Outlet -
Name and Location
of Gaging Station
Colorado River
at Lees Ferry
Drainage
Area (km3)
279,459
Mean Flow
(m3/sec)
350.0
% of Total
1.9
C. Precipitation:*
1. Average annual: 12 cm.
D. Pool Elevation above Sea Level
1. January, 1965 1064 meters (3492 feet)
2. December, 1969 1088 meters (3572 feet)
Increase 1965-
1969
3. Average for 1975
24 meters
1116 meters (3660 feet)
*From National Park Service circular, based on 8 years of records
at Wahweap.
-------
III. LAKE WATER QUALITY SUMMARY
A. Collection Methods
Lake Powell was sampled in April, August, and November-
December of 1975 by NES helicopter teams. Due to the size
and morphology of the lake, adverse weather conditions, and
logistic considerations both the spring and fall samplings
were accomplished in two temporally separate periods. In
April, Stations 01-08 were sampled on the 15th and 16th
while Stations 09-19 were sampled on the 28th and 29th
(Figures 1-3). Station 08 was located well out of the
Colorado River Channel in the lee of protective bluffs.
Station 19 replaced Station 08 which was not resampled on
subsequent visits. Fall samples were collected at Stations
06, 13-16, and 18 on November 24th and 25th. On December 1st,
2nd, and 3rd, Stations 01-07, 09-12, 15, 17, 18, and 19 were
sampled repeating three earlier stations. Significant changes
did occur in the short interval between the two fall sampling
periods.
Sample collection was limited to the upper 220 feet (67
meters) of the water column because of cable length. Conse-
quently, data from deeper waters were not collected. J_n situ
determinations of temperature, turbidity, and conductivity
were made utilizing both analog and digital outputs. Samples
were collected at selected depths for dissolved oxygen, pH,
-------
37C
15'
37C
GLEN
CANYON
DAM
PAGE
o
NAVAJO
GENERATING x
STATION "^
Lr
111'
Figure 1. Lake Powell and Major Tributaries (top).
Station Locations, Lake Powell. Glen Canyon Dam
to Cathedral Canyon (bottom).
-------
37°
30'
HI-
15'
111'
110° 45'
110° 30'
37°
30'
HALLS
CROSSING
37°
15'
110° 45'
110°30'
Figure 2. Station Locations, Lake Powell. Cathedral Canyon
to Halls Crossing.
-------
110° 45'
110° 30'
37<
15'
37°
30'
BULLFROG
BASIN
HALLS
CROSSING
I L
37°
15'
37°
30'
110°45'
110° 30'
110° 15'
Figure 3. Station Locations, Lake Powell. Halls Crossing to
Colorado River.
-------
and nutrient analysis. Samples for chlorophyll a_ and phyto-
plankton samples were composited from several stations prior
to analysis. Samples for algal assays were collected during
the spring and fall sampling periods. These samples were
composited from water collected at each sampling depth and
from up to four stations. (A more complete discussion of
sampling techniques is presented in NES Working Paper 175.)
Physical and chemical lake data are presented in Appendix C
and are summarized in the following table.
-------
STOREY CODE 0408
A. PHYSICAL AND CHEMICAL CHARACTERIS1 . Cls
PARAMETER
TEMPERATURE (DEG CENT)
0.-1.5 M DEPTH
MAX DEPTH«»
DISSOLVED OXYGEN (MG/L)
O.-l.S M DEPTH
MAX DEPTH«»
CONDUCTIVITY (UMHQS)
O.-l.S M DEPTH
MAX DEPTH«»
PH (STANDARD UNITS)
o.-i.s M DEPTH
MAX OFPTH«»
TOTAL ALKALINITY (MG/L)
o.-i.s M DEPTH
MAX DEPTH»»
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH"
DISSOLVED ORTHO P
0.-1.5 M DEPTH
MAX OEPTH»»
N02*N03 (MG/L)
0.-1.5 M DEPTH
MAX DEPTH"
AMMONIA (MG/L)
0.-1.5 M DEPTH
MAX DEPTH"
KJELDAHL N (MG/L)
O.-l.S M DEPTH
MAX DEPTH"
SECCHI DISC
rgo
ENT)
8
4
MG/L)
8
4
S)
8
4
)
8
4
MG/D
R
4
8
4
(MG/L)
8'
4
8
4
8
4
8
4
( 4/15/75
RANGE MEDIAN
9.3- 11.0
6.5- 7.6
9.4- 10.0
5.8- 9.4
576.- 600.
637.- 658.
7.8- 8.4
7.7- 8.0
124.- 131.
135.- 154.
0.010-0.017
0.007-0.014
0.011-0.014
0.011-0.019
0.360-0.400
0.390-0.660
0.020-0.030
0.020-0.020
0.200-0.400
0.200-0.400
9.9
6.9
9.6
6.1
580.
651.
8.3
7.8
130.
149.
0.011
0.010
0.012
0.015
0.375
0.640
0.0?0
0.020
0.300
0.350
MAX
DEPTH
RANGE
(METERS)
0.0-
42.7-
0.0-
42.7-
0.0-
42.7-
0.0-
4?.7-
n.o-
42.7-
0.0-
42.7-
0.0-
42.7-
0.0-
4?.7-
0.0-
42.7-
0.0-
42.7-
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
1.5
61.0
N»
6
3
5
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
{ 8/14/75
S»«« = 3
HAN6E MEDIAN
23.4- 25.3
4.7- 6.9
7.6- 9.0
5.6- 7.2
879.- 945.
583.- 690.
8.5- 8.8
7.8- 8.0
113.- 133.
125.- 140.
0.007-0.011
0.007-0.016
0.008-0.013
0.003-0.019
0.170-0.220
0.500-0.540
0.020-0.040
0.030-0.040
0.200-0.200
0.200-0.200
24.4
5.9
8.0
6.8
937.
656.
8.6
7.9
126.
136.
0.009
0.009
0.009
0.010
0.175
0.540
0.030
0.040
0.200
0.200
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
0.0- 1.5
61.0- 67.1
N*
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
6
3
t 12/ 2/75
S»»« = 3
RANGE MEDIAN
11.7- 13.2
7.0- H.7
6.4- 7.2
2.8- 6.6
526.- 537.
503.- 542.
8.0- 8.1
7.6- 7.9
121.- 126.
120.- 147.
0.006-0.010
0.006-0.012
0.002-0.002
0.002-0.004
0.270-0.310
0.260-0.560
0.020-0.020
0.020-0.020
0.200-0.200
0.200-0.200
12.2
7.4
6.9
6.4
530.
511.
8.0
7.8
125.
138.
0.008
0.006
0.002
0.002
0.275
0.530
0.020
0.020
0.200
0.200
MAX
DEPTH
RANGE
(METERS)
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
41.1-
0.0-
• 1.1-
0.0-
0.0-
•1.1-
0.0-
-1.1-
1.5
67.1
1.5
67.1
1.5
67.1
US
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
1.5
67.1
5.0- 7.0
5.3
4.6- 5.2
4.6
6.4- 15.2
7.6
» N = NO. OF SAMPLES
«« MAXIMUM DEPTH SAMPLED AT EACH SITE
«*« S = NO. OF SITES SAMPLED ON THIS DATE
-------
11
B- Physical Properties
1. Main Channel
Profiles and cross sections of temperature, dissolved
oxygen, and conductivity along the axis of the Colorado
River Channel are presented in Figures 4 through 13. Tem-
perature and conductivity profiles are reproduced from
continuous analog records; those for dissolved oxygen are
interpolated between sampling depths. In April (Figure 4)
the isotherms at depth tend to rise as you proceed downstream,
indicative of upward displacement by inflowing cold, dense
winter water. Reynolds and Johnson (1974) report that annual
cold, saline, advective under flows from the Colorado River
occur each winter which "flush" the bottom waters of the
lake and replace it with cold, oxygenated water.
The August profiles (Figure 5) show a relatively deep,
well developed thermocline. The high surface values at
Stations 10 and 11 are difficult to account for. On the
cross section (Figure 6) the 8° C isotherm is not encountered
in the upper basin, indicative of displacement by summer
runoff waters into the upper reaches of the lake.
In December (Figure 7) mixing is apparent to 35 to 40
meters throughout the lower basin. Very cold water is observed
at Station 09 but either sinks below our sampling levels
-------
12
DAM 2 1 19
STATION NUMBERS
IS 14 12 11
10
TEMPERATURE PROFILE SCALE
CENTER 8 °C STATION MARK
Figure 4. Temperature Profiles and Cross Section (Isotherms °C),
Lake Powell Main Channel, April 1975.
o- pumped water sample.
0
40
. m
u
M20
c
heo
200
240
DAM 2 1 19
STATION NUMBERS
15 14 12 11
10
0
10
20
i
30 j
40:
I
50'
w/
70
5 10 , 20
i u in in mm i
TEMPERATURE SCALE
CENTER
tcr iS'-e
Figure 5. Temperature Profiles, Lake Powell Main Channel,
August 1975.
Station location (j) and 15°C isotherm shown for
reference;
o —pumped water sample.
-------
13
0AM 2 1 19
STATION NUMBERS
IS 14 12 II 10
40
80
.120
160
OAJ1
200
240
•
-
-
-
-
-
X
SOO1
....
---.
~~~:
-'..
•
,
•--_.
i ** ••
24 *
Sa^N
^ " '
- -
^ -.
-,
--..,
|V *
\
S
1
25-----'
Rffl?3]HPK?SSOT
- - -"_"."-"- "- "f 1 1
-~~~'.'---~--~"
"" - — — ^ "" "* ^ —
~-~—-w -".'_'.
_^*~***
-.^---'
i
/
/
*
^®
^X^ ^
*o~.
-^__~
— -'
^ 1
*<•*
•»^^ * •
z~— -
-~II
**!•;
i
i *
3— V25— -
iff-V=J==H
~~~~~- ""."-"-•
~-~~~~.~-~-~-~~~-
»* * * ^ *
*— <• * ^
** '
--*1"* /'
S*
\
^ f *
.--"*
~--*
!*f*^0 "" " *" *** V" "*
:.T)5
--;
r*'
{ .
-
-
-
-
-
0
in
IU
20
30 o
-4
40 =
m
503
GO
60
70
Figure 6. Temperature Cross Section (Isotherms °C),
Lake Powell Main Channel, August 1975.
Vertical lines indicate station location and
depth of profile records.
DAM 2 1 19
STATION NUMBERS
15 14 12 11
10
0
40
• 80
l
^120
I
160
200
240
i
10—
5 10 I5°C1
TEMPERATURE -
PROFILE SCALE
CENTER 10°C -
UNDER STATION
MARK
0
10
20.
r
30J
*S
40 i
I
50
60
33
t/>
Figure 7. Temperature Profiles and Cross Section (Isotherms °C),
Lake Powell Main Channel, November-December 1975.
Solid profiles were obtained in December, dotted
profiles in November; o- pumped water sample.
-------
14
or is mixed quite rapidly since only a hint of its presence is noted
at Station 05. A third hypothesis would be that it represents a cold
water "slug" that has not yet progressed downstream to Station 05.
Conductivity profiles and cross sections along the main axis of
Lake Powell are shown in Figures 8, 9, and 10. Conductivity values
indicated are ambient; they have not been adjusted to 25 C*.
In April (Figure 8) high conductivity isopleths in the upper
reaches of the lake extrapolate to below the maximum sample depth
at downstream sites, again suggesting a dense water flow into the
bottom layers of the lower basin. The higher surface conductivity
values at Station 05 probably reflect the two week interval between
sampling of Station 05 and adjacent stations.
Summer surface conductivities (Figure 9) are very high because
of warm, saline inflowing surface waters and extensive evaporation.
If specific conductance values were used, the surface gradient would
be somewhat less apparent, but high values would still remain.
Very low conductance observations at Station 14 during the fall
sampling (Figure 10) are a result of earlier sampling. There was
little apparent structure remaining in December; however, relatively
*This adjustment can be approximated by the formula SC25 = Cj + .02 (25-T)
where SC;>5 = Specific Conductance at 25° C and Cj = conductance in
nmhos/cm at Temperature T in °C.
-------
DAM2 1 19
STATION NUMBERS
15 14 12 11
10
40
80
L120
!160
200
240
.'
_
-
.
'
t
1
1
i
''
t 990
-Arr.-.-l. -800—
„ — 600
(
'/
X.
-•
um
uUU
..--
—
•
60Q
.'''
\
3
'"•/
v
1
.--'
<
> 1 j. iyo'l f
"~-''^f" 9 ) ' ' f
f 600
V. --'.-*'
X' 'I 4 ? 10
7on • iiliiuii
.."" xlOOumhos
CONDUCTIVITY SCALE"
CENTER
6 WITH STATION MARK-
10
20
301
40 "1
m
50 i
60
70
Figure 8. Ambient Conductivity Profiles and Cross Section
(Isopleths in ymhos). Lake Powell Main Channel,
April 1975.
o — pumped water sample.
DAM 2 1 19
STATION NUMBER
15 14 12 11 10
40
80
120
160
200
240
'
-.
"
-
.--
f
1
^
i <600
I
«
| \
i N600
t
i
i
i
l.i...1.0.. CON
1
DUCTIV
<600
^*
MTY SCALE
xlOOpmhos CENTER 6 WITH STATION MARK
i
,*'
s
s
1
1
600
1
I
/
'
/
V •
\ I
'eOO j-
\ i
\ •
\
-
1 -1
t'
s'\
700 \f
, 'I
.' f f
800' *
Figure 9. Ambient Conductivity Profiles and Cross Section
(Isopleths in umhos), Lake Powell Main Channel,
August 1975
o — pumped water sample.
o
10
20 =
m
-o
40 ^
301
—I
m
50 JS
60
70
-------
0AM 2 1 19
15 14
STATION NUMBERS
12 11
10
0
40
80
P1
LLJ
£120
£
SI60
200
240
-
.
-
-
-
\
*
• ' 1 400
% i \ I/
500 f j
II •
~^"500 4 "*K
"* x i ' ' N.
• 1
,
i
\ -;
//
1
* «i
/
/ /
i/
500?
n
ii
//
,/
r-
* 700
1
• - _
* 600 , ^
46, 10
UUL1JLU
XlOOutnhos,
CONDUCTIVITY
SCALE
CENTER
6 WITH STATIO
MARK
.
-
-
_
N
10
20
30 |
40^
S»
m
50 1
60
70
Figure 10. Ambient Conductivity Profiles and Cross Section
(Isopleths in ymhos), Lake Powell Main Channel,
November-December 1975
Solid profiles were obtained in December, dotted
profiles in November; o — pumped water sample.
DAM2 1 19
15
STATION NUMBERS
14 12 11
10
40
^80
LI
L.
;120
LJ
3
160
200
240
ft
''*'
s s
s
57
0.0. PROFILE SCALE
CENTER 7 WITH
STATION MARK
0
10
20
I
I
30;
40 i
50"
60
70
Figure 11. Dissolved Oxygen Profiles and Cross Section
(Isopleths in mg/liter), Lake Powell Main Channel.
April 1975.
o — pumped water sample.
-------
17
saline water can be seen entering from the north.
Cross sections and profiles for dissolved oxygen are presented
in Figures 11, 12, and 13. Profiles are interpolated between sampling
depths. Spring values were relatively high. Less dissolved oxygen
was found in the deeper waters of the lower basin, implying the
presence of "older" water at those stations. The oxygen minimum
observed at Stations 01 and 19 at about 50 meters depth appears to
correspond to an old plateau canyon break prior to inundation. The
minimum is more pronounced in the wider lake areas (Station 19), where
there is a corresponding increase in the extent of the exposed ledge.
Page and Johnson (1975) attribute the dissolved oxygen minimum to
biological respiration of organic rain. During the summer sampling
(Figure 12) the dissolved oxygen minimum observed in the upper 30 meters
generally corresponds to the thermocline. In this instance biological
respiration is, in all probability, the responsible agent. December
sampling (Figure 12) found virtually no structure in the dissolved
oxygen distribution other than a poorly developed deep oxycline at
several stations at the 35-50 meter level.
-------
18
DAM2 1 19
STATION NUMBERS
15 14 12 11 10
0
10
20
I
30
40
50'
60
70
40
80
120
160
200
240
I
mg/l
0.0. PROFILE SCALE .
CENTER
7 WITH STATION MARK
Figure 12. Dissolved Oxygen Profiles and Cross Section
(Isopleths in mg/liter), Lake Powell Main Channel,
August 1975.
o — pumped water sample.
STATION NUMBERS
0
40
80
120
160
200
240
AM
-
•
-
'
.
.
•
2 1 1
--'fr
(F
i
•
^ |
\
\ 1 ff
I
I
1
1
9 1
F ~1"~"'
*~
(
5 14 1
*•
~*
f
J /
1 /
/}
f
1 (
1
1
I
2 1
\
\
\
\
\
\
\
N
1 1(
**^ 1
/
/
) 5
>'
i
I
i
'
X
X /
/
/
9
'\
/v
/ / 'I -
/ 'I
/I/0" "
y
/ LiJ.0^/1-
/D.O. PROFILE SCALE
/ CENTER
' 7 WITH STATION "
MARK
0
10
20
O
m
30 ^
40 1
-H
m
sol
60
70
Figure 13. Dissolved Oxygen Profiles and Cross Section
(Isopleths in mg/liter, Lake Powell Main Channel,
November-December 1975
Profiles with o indicating the depth of pumped
water samples were obtained in December, those
with r, in November.
-------
19
2. Tributary Arms
San Juan Arm
In April relatively warm, low salinity water from the San
Juan River overflowed the colder, more saline waters of San Juan
Arm. Warm surface waters (> 13° C) were found to about the 6 meter
level at Station 16, the most upstream sampling station (Figure
2). By Station 13, about halfway down the Arm, the 13° C isotherm
had risen to about 1.3 meters and the 12° C isotherm from 7 to 3.5
meters. Station 14, located at the mouth of the Arm, had no
temperatures greater than 11° C. Temperatures averaged about
1° C higher at all depths in the San Juan Arm than at Station 14
the Colorado River Channel. These stations were sampled in sequence
by the same flight team so sampling and/or temporal differences
do not account for this discrepancy.
In August, the temperatures of the inflowing waters were quite
high (23-25 C). Interestingly, the surface water at Station 13
midway along the Arm was warmer and less conductive than at either
end.
Stations 13, 14, and 16 were sampled in November during the
final round. Very low temperature, low conductivity waters from
the San Juan River were found at Station 16. Stations 13 and 14
had warmer, more conductive water at all levels.
-------
20
EscaJjnte Canyon
Escalante Canyon is represented by Station 17 upstream and
Station 12 near the canyon mouth in Lake Powell's main channel
(Figure 2). In April, surface temperatures and conductivities were higher
in the canyon than in Lake Powell proper, while at depth there was a
slight reversal of this trend. During the summer, higher surface
temperatures were found in the canyon while water temperatures at inter-
mediate levels were similar to those in the open lake. Summer conduc-
tivity values obtained at Station 17 are suspect due to intermittent
malfunction of the probe. Low dissolved oxygen levels were found at
the bottom and at about 21 meters, the level of a submerged ledge.
During the winter sampling, however, little difference was noted between
the two stations. Within the canyon, an oxygen minimum occurred at
about 42 meters depth.
Bullfrog Basin
Bullfrog Basin is represented by Station 18, located at the upper
end of the Basin, Station 06, near Bullfrog Marina, and Station 11,
situated in the main channel where Lake Powell necks down from the
relatively wide lake area near Bullfrog (Figure 3). Because of their
exposure, Stations 06 and 18 were reoccupied at slightly different locations
on each sampling round to take advantage of windbreaks provided by
the surrounding bluffs. In November, for instance, Station 06 was
located nearly inside the Bullfrog anchorage area while in December it
was near midchannel and in April somewhat favored the opposite (western)
-------
21
side of the Basin. In April Station 06 was sampled 2 weeks earlier than
Stations 11 and 18. During the fall sampling Station 11 was only
visited in December while 06 and 18 were sampled both in November and
December.
During the spring sampling, temperatures for the upper 15 to 18
meters were slightly less inside Bullfrog Basin than at Station 11.
Below that level the water was apparently the same. There were no
significant differences in conductivity or dissolved oxygen between
the three stations. Values for pH were somewhat lower within Bullfrog
Basin than in Lake Powell proper. During the August sampling, data
from the three stations were very similar except for low dissolved
oxygen values near the bottom at Station 18. During the November and
December rounds there was little variation between stations although
both pH and dissolved oxygen values were slightly higher inside the
Basin. Between the November 25th and December 3rd samplings temperatures
decreased about 2° C over the entire water column at Station 18, while
conductivity and oxygen values increased slightly. The % saturation
values of dissolved oxygen remained the same, however. At Station 06
both conductivity and temperature decreased markedly between the November
and December samplings. (Temperature accounted for only about one-half
of the conductivity change.) The observed changes at this site were
probably due in part to the adjustment of station location.
-------
22
Navajo Arm
Navajo Arm is represented by samples at Station 01, at the con-
fluence with lower Lake Powell, and Station 04, about midway up its
length (Figure 1). A planned station at the upper end of the Arm was
deleted due to the very narrow canyon walls in that area. Water
conditions were similar at both stations during the April and August
sampling rounds although slightly higher temperatures and conductivities
were present at Station 04 in August. A weak dissolved oxygen minimum
was present at Station 04 at 45-48 meters on both rounds. In
December the water above 36 meters at Station 04 was isothermal and low
oxygen values were found at all levels. Conductivity values were
higher at all depths inside the Arm than in Lake Powell proper, the
difference increasing with depth.
-------
23
C. Biological Characteristics:
Biological collection methods were described previously.
The data obtained are presented in the following tables:
1. Phytoplankton -
Sampling
Date
04/16/75
08/14/75
12/01/75
Dominant
Genera
1.
2.
3.
4.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Chroomonas?
Fragilaria
Cryptomonas
Glenodinium
Other genera
Total
Fragilaria
Chroomonas?
Centric diatom
Navicula
Skeletonema
Other genera
Total
Chroomonas?
Fragilaria
Cryptomonas
Tetraedron
Scenedesmus
Algal
Units
Per ml
513
423
257
29
-T-
1,227
816
371
185
148
148
279
1,947
486
333
26
26
26
Other genera
Total
897
-------
24
2. Chlorophyll a_-
Station Chlorophyll £ (ug/1)
Number Sampling Round: April August Nov/Dec
01 --- 2.2 —/0.8
02 1.0 2.1 —/0.5
03 1.0 2.2 —/0.9
04 0.5 2.6 ---/0.8
05 2.5 4.7 ---/1.5
06 1.5 7.3 1.9/0.8
07 — 1.8 —/0.7
08 1.5 — — /-- -
09 2.0 23.6 ---/1.4
10 1.2 5.8 —/l-l
11 1.7 6.7 ---/0.9
12 1.2 4.7 —/I.I
13 1.3 4.5 1.7/—
14 0.9 5.3 1.9/ —
15 1.2 4.3 2.2/0.9
16 1.5 8.7 9.2/ —
17 1.5 3.9 ---/0.9
18 1.5 6.3 2.1/1.3
19 1.3 2.7 ---/1.5
-------
25
D. Limiting Nutrient Study
1. Algal assay results on composited Lake Powell water
that has been autoclaved, filtered, and nutrient spiked.*
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0
1.0 N
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Stations 06 and 08 -
Date Sampled 4/16/75
Ortho P
Cone, (mg/lj
0.006
0.056
0.056
0.006
Inorganic N
Cone, (mg/1)
0.440
0.440
1.440
1.440
Station 09
Date Sampled 4/28/75
Ortho P
Cone (mg/1)
Inorganic N
Cone, (mg/1)
<0.005 0.556
<0.055 0.556
<0.055 1.556
<0.005 1.556
Station 13 and 16
Date Sampled 4/28/75
Ortho P
Cone, (mg/1)
0.015
0.065
0.065
0.015
Inorganic N
Cone, (mg/1)
0.490
0.490
1.490
1.490
Maximum Yield
(mg/1-dry wt.)
0.1
5.1
7.3
0.1
Maximum Yield
(mg/1-dry wt.)
0.1
14.7
21.2
0.4
Maximum Yield
(mg/1-dry wt.)
4.0
16.7
22.1
6.6
*See EPA, 1975.
-------
26
Control
0.050 P
0.050 P
1.0 N
1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P +
1.0 N
1.0 N
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Stations 12 and 17
Date Sampled 4/29/75
Ortho P
^ (mg/1)
<0.005
<0.055
<0.055
<0.005
Inorganic N
Cnc.
0.375
0.375
1.375
1.375
Stations 11 and 18
Date Sampled 4/29/75
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.450
0.450
1.450
1.450
Stations 14, 15, and 19
Date Sampled 4/28/75
Ortho P
Cone, (mg/1)
<0.005
<0.055
<0.055
<0.005
Inorganic N
0.475
0.475
1.475
1.475
Stations 02, 03, 04, and 07
Date Sampled 12/1/75
Ortho P
Cone, jmg/1)
0.005
0.055
0.055
0.005
Inorganic N
Coney jmg/l|
0.320
0.320
1.320
1.320
Maximum Yield
(mg/J-dry wt.)
0.2
0.4
0.5
0.2
Maximum Yield
(mg/1-dry wt.)
0.3
12.3
19.0
0.2
Maximum Yield
(mg/1-dry wt.)
0.2
13.2
13.6
0.2
Maximum Yield
(mg/1-drj^ wt._]
0.1
0.1
0.1
0.1
-------
27
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Sjpi ke (
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Stations 05, 09, and 10
Date Sampled 12/3/75
Ortho P
Cone, (mg/1)
Inorganic N
Cone! (mg/1)
0.005 0.455
0.055 0.455
0.055 1.455
0.005 1.455
Stations 11 and 17
Date Sampled 12/4/75
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.390
0.390
1.390
1.390
Stations 13 and 16
Date Sampled 11/24/76
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.370
0.370
1.370
1.370
Stations 06 and 18
Date Sampled 12/3/75
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.355
0.355
1.355
1.355
Maximum Yield
(mg/1-dry wt,J_
0.2
13.7
18.6
0.2
Maximum Yield
(mg/1-dry wt.)
0.2
0.6
0.6
0.3
Maximum Yield
(mg/1-dry wt.)
0.5
13.6
21.0
0.4
Maximum Yield
(mg/1-dry wt.)
0.3
11.4
15.6
0.3
-------
28
1. Stations 01, 12, 15 and 19
Date Sampled 12/2/75
Ortho P Inorganic N Maximum Yield
Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/l-dry wt.)
Control 0.005 0.395 0.3
0.050 P 0.055 0.395 4.4
0.050 P + 1.0 N 0.055 1.395 1.1
1.0 N 0.005 1.395 0.2
2. Discussion -
The control yields of the assay alga, Selenastrum
capricomutum*, indicate that potential primary productivity
of Lake Powell was generally low at the time the samples
were taken. The April composite samples from Stations 13
and 16 in the San Juan Arm contained elevated phosphorus
levels due to San Juan River discharge at Station 16. The
assay control yield from this sample was an order of magnitude
greater than that from other stations. The increases in
yield with orthophosphorus alone indicates that Lake Powell
is limited by phosphorus. The addition of nitrogen alone
resulted in yields which were not significantly different
than those of the controls.
The reservoir data substantiate phosphorus limitation;
i.e., the mean inorganic nitrogen to dissolved orthophosphorus
ratios were 25/1 or greater at all stations on all sampling
"for further information regarding the algal assay test procedure
and selection of test organisms, see U.S. EPA (1971).
-------
29
rounds except for Stations 09 and 16 during the August sampling.
Both of these stations are near the inlets of major river systems
and were sampled near the time of maximum flow. Even these
stations had ratios of 15/1 to 11/1 respectively. This range
is one of transition from phosphorus to nitrogen limitation
(N/P ratios of greater than 16/1 are indicative of phosphorus
limitation.)
Several of the algal assays exhibited little or no response
to addition of nutrients. Available data are insufficient to
determine the cause of these anomalous results. However, possible
explanations include the presence of a toxin or limitation by a
nutrient other than nitrogen or phosphorus.
-------
30
IV NUTRIENT LOADING
Stream sampling was not conducted for Lake Powell tributaries
as part of the National Eutrophication Survey. However, by using
USGS data available in STORET, EPA's water quality computer data
bank, some estimates of loading can be obtained.
Loading estimates were made from STORET and other data using
several different computational schemes for 1974, 1975, and long-
term records. Data was adequate for computation on only three
tributaries, the Colorado, Green, and San Juan Rivers. These
three rivers, however, account for 98% of the entering flow. The
three available monitoring sites are all at least 100 kilometers
upstream from the lake. Because of this, and the nature of the
available data, ranges of the computed loadings are provided in
the following table:
A. Annual Nutrient Loading Ranges:
1. Inputs Kg P/Yr. Kg N/Yr.
Colorado River at
Cisco, Utah 10-14 x 105 229-329 x 105
Green River at
Green River, Utah 23-30 x 10$ 80-240 x 105
San Juan River at
Mexican Hat, Utah 5-14 x 1p5 110-130 x 10b
Total 38-58 x 10^ 419-699 x 105
-------
31
2. Outputs Kg P/Yr. Kg N/Yr.
Lake Outlet, Colorado
River at Lees Ferry,
Arizona 1-2 x 105 238-292 x
3. Net Annual
36-57 x 105 kg 127-461 x 10$ kg
B. As can be seen, the lake is an effective nutrient trap.
Most of the nutrients appear to be deposited very near to the
inlets of the tributaries. Ambient total phosphorus and total
nitrogen (N02 + N03 + Total Kjeldahl) concentrations (Appendix B)
are markedly less at Station 16 than those observed in the San
Juan River at Mexican Hat, and those at Station 09 are similarly
less, except during the April sampling near the time of peak
runoff. At Stations 13 and 05 the reductions in nutrient concen-
trations are even more dramatic.
C. Yearly Loads:
The calculated annual phosphorus loading from the rivers
ranges from 5.8 to 8.9 g/m2/yr with over 97% of the phosphorus
being retained by the lake. If these values are compared to those
proposed by Vollenweider (Vollenweider and Dillon, 1974) they
are an order of magnitude greater than his "eutrophic" loading
level of 0.96 g/m2/yr. Vollenweider postulates that at greater
than his "eutrophic" loading level, receiving waters will become
eutrophic. However, the rapid disappearance of the high incoming
phosphorus concentrations suggests that most of the phosphorus
-------
32
is being deposited near the stream mouths. It is probable
that the effective loading, after consideration of this large
sedimentation rate, would still be above the "eutrophic" level,
but only slightly so. A progression towards more eutrophic
conditions can be expected; however, the change should be
relatively slow under present conditions.
-------
33
V. LITERATURE REVIEWED
Bureau of Reclamation. 1966. Reclamation Project Data
(Supplement). U.S. Department of Agriculture, GPO, Washington,
D.C.
Page, F. W., and N. M. Johnson. 1975. Seasonal distribution of
dissolved oxygen in Lake Powell, Utah-Arizona. Abstracts of
Papers Submitted for the Thirty-eighth Annual Meeting,
American Society of Limnology and Oceanography, June 1975.
Reynolds, R. C., Jr., and N. M. Johnson. 1974. Major element
geochemistry of Lake Powell. Lake Powell Research Project
Bulletin #5.
Standiford, D. R., L. D. Potter, and D. E. Kidd. 1973. Mercury
in the Lake Powell ecosystem. Lake Powell Research Project
Bulletin #1.
U.S. Environmental Protection Agency. 1971. Algal assay
procedure bottle test. National Eutrophication Research
Program, Corvallis, Oregon.
U.S. Environmental Protection Agency. 1975. National Eutrophi-
cation Survey Methods 1973-1976. Working Paper No. 175.
National Environmental Research Center, Las Vegas, Nevada, and
Pacific Northwest Environmental Research Laboratory, Corvallis,
Oregon.
U.S. Geological Survey. 1973. Surface water supply of the
United States 1966-1970. Part 9, Colorado River Basin, Volume 2.
Water Supply Paper 2125. U.S. Department of Interior, GPO,
Washington, D.C.
Vollenweider, R. A., and P. J. Dillon. 1974. The application of
the phosphorus loading concept to eutrophication research:
National Research Council of Canada, Publication No. 13690,
Canada Center for Inland Waters, Burlington, Ontario.
-------
34
VI. APPENDICES
APPENDIX A
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF ARIZONA
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Arizona 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.
-------
ARIZONA LAKES
LAKt OATA TO 8E US^D IN "ANKtNGS
LAKE
CODE LAKF '.AMP
0401 -fVELT La*E
0411 SAN C&RLO^ wPstK^OIK
N'EOIAN
TOTAL P
1 1 M A j 2
0 • 0 ^ *^
O.nis
0.162
0.099
n.oi7
0.027
U.010
n.04b
0.020
0.056
MEDIAN
INORC- N
0.090
0.090
0.170
0.050
0.060
0.240
0.040
0.410
0.045
0.040
0.060
SOO-
MEAN SEC
JSh.OOO
466.600
420.231
396.250
4H4.667
369.667
449.154
322.140
440.750
429.917
474.500
MEAN
CrILOHA
2.900
10.683
3.948
3.400
2.633
4.404
9.808
2. BOO
16.367
4.073
14.750
1S-
HIN oo
9.000
14. BOO
10.800
12.200
9.000
8.600
14.900
13.800
12.000
14.000
14.600
MEDIAN
OISS ORTHO P
0.007
0.014
0.005
0.131
0.056
0.010
0.004
0.009
0.009
0.008
0.009
-------
OF LAKES *ITH Hl'inEP VALUES )
*0 , 2)
90 ( •?)
0 ( 0)
10 ( 1)
80 ( *>
60 ( e>)
100 ( lu)
40 ( *)
70 ( n
30 ( 3)
MEDIAN
INOPG
35 (
35 (
20 (
70 (
60 (
10 (
95 (
0 <
80 (
95 (
50 (
N
3)
3)
*)
7)
6)
1)
9)
0)
6)
9)
5)
500-
MEAN SEC
80 (
20 (
hO (
70 1
0 (
90 (
30 1
100 1
40 1
50 (
10 i
; 8)
2)
: 6)
; 7»
; o>
: 9)
[ 3)
[ 10)
[ 4)
I 5)
I 1)
MEAN
CMLORA
60 1
20 1
60 1
70 1
100 1
40 1
30 1
90 I
0 i
50 i
10
I 8)
! 2)
[ 6)
[ 7)
; 10)
[ 4)
[ 3)
[ 9)
I 0)
( 5)
( 1)
15-
MIN 00
85 1
10 (
70 1
50 <
65 1
100 1
0 1
40 1
60 1
30 I
20 i
: 8>
: i)
; 7)
( 5)
: e)
: 10)
I 0)
I 4)
t 6)
1 3)
( 2)
MEDIAN
OISS ORTHO P
80 I
20 (
90 1
0 1
10 (
30 1
100 1
55 I
40 1
70 (
55 ^
[ 8)
[ 2)
I 0)
[ 0)
; i)
I 3)
I 10)
I 5)
I 4)
( 7)
I 5)
-------
UTAH LAKES
LAKE OATA TO *E US^Q IN RANKINGS
LAKE
CODE
0401
4901
490?
4903
4904
4905
4906
4907
490"
4909
4910
4911
4913
4913
4914
4915
491*
4917
491«
4919
4920
4931
493?
4933
4934
49«
560^
LAKE NAME
LAKF POWELL
^EA^ LAKE
LOWE^ BOWN'S HESERVOIR
DEEP CREEK RESERVOIR
ECHO RESERVOIR
LYNN RESERVOIR
FISH LAKE
HUNTINGTON NORTH RESEPVO
JOE'S VALLEY fJE^ERVOTR
MINFRSVILLE °FSERVOIR
MOON LAKE
NAVAJO LAKE
NEWCASTLE RESERVOIR
OTTER CREEK RESERVOIR
PANQUITCH LAKE
°ELTCAN LAKE
PINFVIEW PESFPVOIP
PItJTE RESERVOIR
PORCUPINE RESERVOIR
PRUESS RESERVOIR (GARPIS
SEVIER HPIDGF RESERVOIR
STARVATION RESERVOIR
STEINAKER RESFRVOIR
TRONIC RESERVOIR
UTAH LAKC
WILLARD HAY •^E'-F.RVOIR
FLAMING GOR&F RESERVOIR
MEDIAN
TOTAL P
0
0
0
0
n
0
0
0
0
0
0
0
0
0
0
0
0
n
0
0
0
0
0
0
0
0
0
.010
.011
.031
.038
.047
.131
.033
.013
.013
.1^3
.OOfl
.A16
.051
.067
.071
.044
.028
.047
.035
.057
.036
.016
.011
.031
.13?
.044
.011
MEDIAN
INORG N
0.410
0.040
0.040
0.315
0.170
0.200
0.040
0.040
0.045
0.060
0.040
0.040
0.040
0.040
0.040
0.050
0.300
0.150
0.110
0.140
0.355
0.04Q
0.040
0.050
0.^20
0.060
0.690
500-
MEAN SEC
339
353
336
430
450
417
153
393
400
445
381
36R
4?8
453
436
438
435
483
440
491
449
394
316
4?5
4PO
457
2"b
.830
.167
.000
.333
.333
.667
.000
.000
.000
.000
.000
.000
.667
.667
.500
.500
.083
.625
.000
.000
.778
.583
.750
.000
.583
.182
.636
MEAN
CHLORA
3
0
5
9
6
39
13
1
?
33
3
2
12
11
45
6
5
25
7
4
18
5
1
7
72
7
2
.081
.945
.567
.078
.967
.600
.483
.900
.4H3
.583
.700
.000
.467
.767
.950
.350
.692
.329
.860
.533
.223
.675
.844
.300
.013
.567
.500
15-
MIN DO
13.
9.
9.
14.
14.
10.
10.
7.
11.
8.
9.
6.
13.
10.
14.
8.
14.
11.
12.
8.
12.
13.
12.
a.
11.
11.
10.
800
200
400
800
000
400
400
800
200
600
600
000
600
600
200
400
600
600
400
800
4QO
300
600
400
400
000
400
MEDIA*
DISS ORTHO o
0.007
0.003
0.006
0.006
0.01?
0.053
0.004
0.005
0.003
0.107
0.002
0.003
0.000
0.033
0.010
0.004
0.006
0.007
0.011
O.OOP
0.008
0.004
0.005
0.006
0.012
0.009
0.003
-------
LAKf
CODE LAKE NAME
040" LA*E POwFLL
4Q01 3EA& LAKE
490? LOWFR PO«*\-«S
4903 DEEP C»EE<
4904 ECHO
4905 L*NNJ
4006 FISH
4907 HIINTINGTON NORTH PESEPVO
490B JOE'S VALLEY
490Q MTNERSVILl.E
4Qlo MOON LAKE
4911 NAVAJO LAKt
4912 NEWCASTLE PESE«VOIR
4913 OTTER CREE< RESERVOIR
4914 PANOUITCH
4915 PELICAN L
4916 PINEVIEW
4017
491 8 PORCUPINE
4919 PRUESS
4920 SEVIE» BRIDGE
4921 STADVATIOM
40?? STEINA
49?3 TROPIC
A9?4 UTAH
49?S
EI.AWIMG GORGE
(GARRIS
TOTAL
96 (
OO (
46 (
42 (
31 (
a (
62 (
77 (
81 (
0 (
100 (
69 (
23 (
15 (
12 (
•^7 (
bO (
?7 (
Sp (
10 (
54 (
73 (
85 (
65 (
4 (
37 (
<)0 (
P
25)
23)
1?)
11)
8)
2)
16)
20)
?1>
0)
26)
18)
6)
4)
3)
9)
13)
7)
15)
5)
14)
19)
22)
17)
1)
9)
23)
INOPG
4 (
87 (
87 (
19 (
27 (
23 (
65 (
65 (
58 (
44 (
67 (
37 (
87 (
87 (
65 (
54 (
15 (
31 (
38 (
35 (
8 {
87 (
87 (
50 (
12 (
44 {
0 (
500-
INOPG N MEAN SEC
87 ( 19) 96 ( 25)
87 ( 19) «5 ( 22)
19 (5) 42 ( 11)
27 (7) 19 ( 5)
23 (6) 58 ( 15)
65 ( 16) 100 ( 26)
65 ( 16) 69 ( 18)
58 ( 15) 6? ( 16)
44 ( 11) 27 ( 7)
67 ( 19) 73 ( 19)
37 ( 19) 77 ( 20)
87 ( 19) 46 ( 12)
87 ( 19) 15 ( 4)
65 ( 16) 50 ( 13)
54 ( 14) 35 ( 9)
15 (4) 38 ( 10)
31 ( 8) 8(2)
38 ( 10) 31 ( 8)
35 ( 9) 0(0)
8(2) 23 ( 6)
87 ( 19) 65 ( 17)
87 ( 19) 88 ( 23)
50 ( 13) 54 ( 14)
12 ( 3) 4(1)
44 { 11) 12 ( 3)
0(0) 92 ( 24)
SEC
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
21)
25)
22)
11)
5)
15)
26)
18)
16)
7)
19)
20)
12)
4)
13)
9)
10)
2)
8)
0)
6)
17)
23)
14)
1)
3)
24)
MEAN
CHLOHA
73
100
65
35
50
8
23
92
85
12
77
88
27
31
4
54
58
15
38
69
19
62
96
46
0
42
81
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
(
19)
26)
17)
9)
13)
2)
6)
24)
22)
3)
20)
23)
7)
8)
1)
14)
15)
4)
10)
18)
5)
16)
25)
12)
0)
11)
21)
15-
MIN 00
15
77
73
0
12
6?
62
96
46
85
69
100
19
54
9
90
4
38
33
81
33
23
27
90
42
50
62
( 4)
( 20)
( 19)
( 0)
( 3)
( 15)
( 1*)
( 25)
( 12)
( 22)
( 18)
( 26)
( 5)
( 14)
( 2)
( 23)
( 1)
( 10)
( 8)
( 21)
( 8)
( 6)
( 7)
( 23)
( 11)
( 13)
( 15)
M
DISS
42
90
50
58
13
4
79
69
96
0
100
85
27
8
23
73
58
46
19
37
37
79
65
58
13
31
90
ESpT->
( 11 >
( 2-»
( 1**
( 14*
( •*»
( T /
( 2" J
( 1»
( 2=:
( 0,
( 2*1
( 2»
( 7)
( ?•
( M
( 1°)
( 14)
( 12)
( =;>
( 9)
( 9)
( 20)
( 17)
( 14)
( 3)
( 8)
( 23)
-------
APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = 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 C
PHYSICAL AND CHEMICAL DATA
-------
STO^tT KE.TrtIt.VAL uATt
UAIL LUTrtOPnlCATION
trA-LAS VEGAS
CU08U1
36 5o 4b.O 111 33 05.0 3
04005
AHllUNA
DATE
(• HO"
TO
75/04/15
75/OH/14
75/12/02
TIME UtHTrt *aTE.K
OF rtMi-
DAY FEET
14
14
14
14
14
14
14
14
14
14
1*
13
13
13
13
13
13
13
13
13
11
11
11
11
11
11
11
11
30
30
30
30
30
30
30
30
30
30
30
15
15
15
15
15
15
15
15
15
05
05
05
05
05
03
05
05
0000
0005
0015
0025
0050
00b5
0073
0120
0130
016d
0200
0000
0003
001^
0030
0050
00/5
0115
0133
0200
0000
0005
0030
0060
014C
017U
0200
0220
CENT
lu
10
9
9
*
4
b
7
7
b
b
24
25
25
21
17
15
11
b
5
13
I'c
12
11
11
9
b
7
. ?
.1
.3
.8
.6
.5
.5
.9
.4
.9
.7
.1
.3
.1
.5
.1
.4
.0
.5
.9
.2
.3
.1
.9
.4
.b
.3
.0
00
Ml>/L
10
y
9
9
9
V
a
7
6
6
b
9
7
8
a
5
5
6
b
7
7
7
o
7
7
b
6
6
.0
.0
.6
.7
.2
.4
.6
.4
.0
.0
.2
.0
.6
.2
.4
.4
.6
.b
.6
.2
.2
.u
.4
.0
.2
.0
.2
.4
00010 00300 00077 00094 00400
TMA,«,iP CNOUCTVV HH
StCCHl HELO
INCHES MicwOMHO su
19e 5b9 b.40
5bl 8.30
b7b b.JO
577 b.30
57b b.30
571 b.2o
5b5 H.10
599 7.BO
635 7.70
645 7.70
b57 7.90
204 890 b.HO
940 8,bO
940 b.70
611 b.75
6b3 6.20
67b b.10
677 b.10
63b b.lo
5b3 8.00
600 533 6.00
526 8.00
520 8.00
500 b.OO
510 b.OO
507 7.80
507 7.60
511 7.80
ES 2111202
FEET DEr-
00410
T ALK
CAC03
Mb/L
131
130
126
129
132
131
132
1*5
14b
14*
134
130
131
134
134
133
137
1*2
147
125
125
123
126
125
125
133
135
136
Tn CLAbS
00610
NH3-N
TOTAL
MG/L
0.020
0.020K
0.020K
0.020K
0.020
0.020K
0.020
0.020*
0.020K
0.020K
0.0?0
0.040
0.040
0.030
0.030
0.030
0.020
0.020
0.030
0.040
0.020K.
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
0.020K
00
00625
TOf KJtL
N
MG/L
0.400
0.300
0.300
0.300
0.300
0.200
0.200
0.200
0.200
0.300
0.200K
0.200
U.200K
0.200K
0.200
0.200
0.200
0.20 OK
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200*
00630
NU2SN03
N-TOTAL
MG/L
0.370
0. JbO
0.380
0.3»0
0.380
0.3*0
0.410
0.^20
0.640
0.660
0.6&0
0.170
0.170
0.180
0.180
0.410
0.430
0.400
0.430
0.500
0.2HO
0.270
0.270
0,?-50
0.^0
0.510
0.520
0.^60
00671
PhOS-OlS
OHOO
MG/L H
0.014J
0.011J
0.013*
0.012K
0.012K
0.013K
0.012K
0.012K
0.011*
Q.OlbK
0.019K
0.013
0.009
0.010
0.011
0.009
0.011
o.oii
0.012
0.010
0.002
O.Q02K
0.002K
0.002K
0.002*
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
HtTriltVAL DATE 76/11/26
NATL EUr^OPi-ICAT ION SUHv/tY
tPA-LAS
040801
J6 58 4b.O 111 23 05.0 3
04005
11EPALES
0999 FEtF
CLASS 00
UATt TIME OEPT*
(•HUM OI-
IO uAy
fb/04/15 14
14
14
14
14
14
14
14
14
14
14
75/08/14 13
13
13
13
13
13
13
13
13
75/12/02 11
11
11
11
11
11
11
11
FEET
JO
30
JO
30
30
JO
30
30
JO
30
30
15
15
15
15
15
15
15
15
15
Ob
05
Ob
05
05
05
05
05
0000
000"3
0015
OOib
0050
0065
00/5
0120
QUO
OloO
020n
0000
0005
001S
OOJO
0050
0075
0115
0155
0200
0000
0005
OOJO
OOSO
0140
01 ft)
020u
0220
00665 32217 00031
HMOi-rOT CMLHH'ttrL INLOT LT
A KFMNliNiG
MG/L C Uli/L PEKCElMT
0.017
0.011
0.012
0.010
0.011
0.011
0.009
0.007
O.OOb
0.013
0.014
0.011 2.2
0.010
0.012
U . 0 1 0
0.011
0.009
0.009
0.009
0.009
0.006 U.«
0.000
0.006
0.006
0.006
O.U05
0.005
0.006
-------
STUKtT HtTRiEVAL i.»AT£ 7b/ll/*b
NATL EUTHOPrtlCATION boHVtY
ePA-LAS VEOAS
040H02
36 56 50.0 111 29 15.0 3
L.AK.E
0<»005
1105*1
DftTt
ro
75/04/15
75/08/14
75/12/01
nooio
Tint DEPTH rtftTEw
OF TErtP
L»Ar FEET
13
13
13
13
13
13
13
13
10
10
10
10
10
10
10
10
15
15
15
15
15
15
30
30
30
30
30
30
30
30
00
00
00
00
00
00
00
00
30
30
30
30
30
30
0000
0005
0015
00*5
0050
0100
0150
0200
0000
0005
0025
0050
0090
0140
018U
0220
0000
0005
0015
0060
0110
0135
CtiMT
9.3
9.<»
9.3
9.2
8.5
8.1
7.0
6.5
23.4
23.6
23.2
16. a
13.8
8.8
6.7
4.7
11.7
11.7
11.6
11.7
11.7
11.7
0030U
uO
9.7
9.6
10. 0
9.8
9.6
9.2
6.U
3.8
8.0
8.2
6.*
7.2
7 .c.
6.O
7.0
6.9
7.0
7.0
6.8
6.6
000^7 000*4
TfcANaP CNOOCTVT
StCCnl FIELD
INCHtS MICHUMHO
*0<»
180
300
576
577
576
571
564
364
637
645
879
937
933
790
747
641
64*
656
528
528
507
503
503
lltPALES
09*9
00400
PH
su
8.30
7.80
8.20
8.20
8.20
7.80
7.80
7.80
8.60
8.60
8.60
8.30
8.20
8.05
8.00
7.90
8.10
8.00
8.00
8.00
7.90
7.90
2111
FEET UEi-TH CLASS
00410
T ALK
CAC03
MG/L
128
130
131
129
130
144
146
149
121
122
122
131
130
132
13u
136
122
121
121
119
120
120
U0610
NH3-N
TOTAL
MG/L
0.030
0.020*
0.020K
0.020K
0.020
0.020K
0.020*
0.020K
0.020
0.020
0.030
0.030
0.060
0.040
0.030
0.040
0.020
0.020
0.020
0.020
0.020
0.020
L2U2
00
00625
TOT KJtL
N
MG/L
0.200
0.300
0.300
0.300
0.200
0.200
0.300
O.»00
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.2001V
0.200*
0.200*
0.2GOK
0.*OOK
0.200K
0.2UO*
00630
N02&N03
N-TOTAL
MG/L
0.390
0.370
0.370
0.370
0.380
0.630
0,h40
0.660
0.180
0.170
0.170
0.310
0.390
0.420
0.460
0.540
0.270
O.?70
0.270
0.260
0.260
0.260
00671
'HOS-OI!
OHTnO
MG/L H
O.OU
O.Olo
O.OK
O.OU
O.OU
0.01;
O.OH
O.OK
0.00"
0.00'
O.Olt
O.Oli
0.00.
0.00.
O.OOi
0.00.
0.00.
0.00.
0.00<
0.00>
0.00.
0.00<
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STOHtT Rtr^IdVAt, UATL 76/11/26
NATL EUTHOPiiICATlON SlMvtY
tPA-LAS
0*0802
36 56 50.0 ill <;9 15.0 3
LAKt PJwtLL
04G05 AKlZ'jNA
llfcKALES
FEET
CLASS 00
00665 32217 u003l
DfaTE
fHO«
TO
75/04/15
75/08/14
75/12/01
TIrtd DEPTH
Oh
DAY
13
13
13
13
13
13
13
13
10
10
lu
10
10
10
10
10
15
15
15
Is
15
15
FEET
30
30
30
30
30
30
30
30
00
00
00
00
00
00
00
00
30
30
30
30
30
30
0000
0005
0015
0025
OOaO
0100
0150
0200
0000
ooo->
0025
0050
00*0
01*0
oieio
0^£0
0000
0005
0015
0060
0110
0135
PriOS-TOT CHLrJPnYL INCOT LT
MG/L
0
0
0
0
0
U
U
0
0
0
0
0
0
u
0
0
0
0
0
u
u
u
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
A PENNING
P UG/L fEKCEitT
01 r i.o
Oil
Oil
Oil
OOH
010
010
oil
007 2.1
007
007
003
007
006
00&
007
009 0.5
007
006
007
007
006
-------
STO-iciT KfcTRInML
NAIL tUTKOPnICATIu'v
76/11/26
040803
37 01 35.0 111 25 15.0 3
49025
AHI/ONA
OOUlO
UftTE
TO
Tliit OEHTn
OAY KELT
CtfvT
00300
00
75/04/15
75/08/14
75/12/02
15
15
15
15
15
15
15
15
15
15
15
10
10
10
10
10
10
10
09
09
09
09
09
30
30
30
30
30
30
30
30
30
3U
30
45
45
45
45
45
45
45
00
00
00
00
00
0000
0005
0015
0025
0045
0055
00/S
00*3
0100
0130
0140
OOOU
0005
0025
005D
0090
0130
Olol
OOOU
0005-
0030
OObO
01*5
9.
9.
9.
9.
9.
9.
8.
8.
8.
7.
24.
24.
17.
14.
10.
8.
11.
11.
11.
11.
11.
9
9
8
8
8
7
8
3
1
5
9
1
3
3
8
3
1
1
7
8
6
V
•«
9
9
4
lu
9
.
.
.
.
.
.
.
o.
7
7
8
a
8
6
5
5
5
7
/
7
/
t>
.
.
.
.
.
.
.
.
.
.
.
.
.
.
6
t>
6
b
6
0
0
4
8
0
0
2
4
b
8
O
4
2
0
2
0
«
00077 00094
TKANSP C.MDUCTVY
StCCHl FIELD
INCMtS MICkOMHU
156
216
577
576
577
577
577
574
567
572
577
606
954
952
916
756
747
b94
685
497
607
504
505
00400
SU
8.30
8.30
8.30
8.30
8.JO
8.30
8.20
8.10
7.90
7.90
8.55
8.60
8.6u
8.30
8.10
7.95
7.90
7.90
7.90
8.00
8.00
b.OO
tS 2111202
FEET Jtl-Th CLA5>S
00410
T «LK
CAC03
MG/L
13
-------
STO^tT *icTriIEVAL u&Tt
NATL EUTkOf-riICATIj.\ SUnwtY
t^A-LAS VEGAS
040«OJ
3? 01 35.0 111 <:5 15.0 3
ARIZONA
KtET UEl-lh CLASS 00
UttTE TIME OEi-r-' r
TO DAY FEtT
75/Of/lb Its
Ib
15
15
15
15
15
Ib
15
Ib
75/OS/14 10
10
10
10
10
10
10
7b/12/02 0*
09
OS
09
0*
30
JO
30
30
30
30
30
30
30
30
4b
45
45
45
45
45
*5
00
00
00
00
00
00 00
O'JOb
001s
OOiS
ou<*s
Oubf.
OU /t>
00ii.s
OluO
01*')
0 0 IJ 0
0005
0025
OObO
00*0
0130
Olol
0000
OOOb
OOJO
OGeO
0 1 *b
Odb6b 32217 OOOJl
-lOs-roT CMLKPNYL INCUT LI
Mb/L * Ufa/L PEKCtNT
0.1)0^ 1.0
0.008
0.008
0.007
0 . U 0 n
U.UOrt
0 . 0 0 tj
U.OUB
0.007
0.011
0 . 0 0 b 2.2
0.008
0.008
U.010
0.007
0.010
U.Ull
0.007 0.9
0.007
0.012
U .034
0.0 J9
-------
N.ATL e
-IATE /b/li/26
VEGAS
040e04
J6 bb 13.0 111 lt> bO.O 3
040Ub
DATE ri*E
or
to UAT FtET
75/04/1-3
/b/08/14
/5/12/02
00010
CENT
00300
00
17
1 /
17
I/
17
17
17
17
17
14
14
14
14
14
14
14
14
14
09
09
09
09
09
09
09
09
on
00
00
00
00
00
00
00
0')
10
10
10
10
10
10
10
10
10
45
45
45
45
45
45
45
45
0000
OOOT
001"'
0030
OOoO
007b
Olon
OloO
01 / 1
OOGi'
0005
001S
0035
0050
00*0
012:1
Olb'J
0200
0000
OOOb
OOJO
OOoO
012"
0 1 / il
0200
02iU
11
11
10
10
9
b
b
7
7
25
24
24
20
17
14
11
8
6
12
It
12
12
12
<*
a
1
.0
.0
.9
.3
.6
.5
.2
.5
.2
.2
.8
.6
.7
.s»
.1
.0
.6
.9
.3
.2
.3
.2
.2
• o
.4
.4
-*.b
9.4
9.6
9.4
9.0
8.0
7.6
4.2
6.0
8.0
d.2
6.2
9.4
8.0
6.6
7.2
4.2
5.6
6.4
6.4
6.4
6.6
6.2
3.2
2.8
2.0
00077
StCCHl HtLO
INCHtS M]
27b
180
252
litMALES
U176 FEET
CLAbb 00
•*A.
TVT
'MhU
600
600
o99
&90
bb3
573
5>7b
654
6b6
936
945
941
8b5
B02
733
6bS
6bO
bVO
b37
b31
b25
b32
b^8
b£4
b23
542
00400
HM
Su
a. 30
e.4C
8.30
B.30
6.10
b.10
7.90
7.7u
7.7o
U.bO
rt.bu
H.60
8.55
fl.2b
b.^0
d.10
7.90
7.60
b.oo
B.OO
a. 00
8.00
7.<»u
?.«0
7.60
7.bO
00410
T ALK
CAC03
MO./L
131
12^
129
12?
12?
UO
1J2
146
149
133
113
lib
122
12?
\0
0.380
0.400
0.380
n.460
0.540
0.310
0.310
0.300
0.^00
0.300
O.»70
0.4hO
O.b30
00671
"HOS-DIS
OHTMU
MG/L t»
0.014
0.011
O.OlJ
0.012
0.0l£
O.OO1*
o.oic
0.011
0.01«
o.ou
o.oio
0.00<1
O.OH
0.01<
O.OOc
o.oov
0.012
0.01<4
0.002
0.002
0.002
0.002
O.OGf
0.002
0.004
n.oo'
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOHET rttTRIEVAL UATE 76/11/26
NATL tUTROPHlCATION SUKVtY
EPA-LAS tfEGAS
040804
36 55 13.0 111 18 50.0 3
LAKE POWELL
04005 AKIZONA
110591
HEPALES
0176 FEET
UEKTrt
2111202
CLASS 00
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEtT hG/L P
75/04/15 17 00 0000 0.012
17 00 OOO1? 0.010
17 00 0015 0.011
17 00 0030 0.008
17 00 OObO 0.009
17 00 0075 0.007
17 00 0100 0.006
17 00 0150 0.006
17 00 0173 0.007
75/08/14 14 10 0000 0.010
14 10 00OS 0.009
14 10 0015 0.009
14 10 0035 0.010
14 10 0050 0.010
14 10 0090 0.009
14 10 0120 0.009
14 10 0160 0.011
14 10 0200 0.016
75/12/02 09 45 0000 0.010
09 45 0005 0.009
09 45 0030 0.007
09 45 OOttO 0.007
09 45 0120 0.007
09 45 0170 0.016
09 45 0200 0.009
09 45 0220 0.012
32217
CHLHPHYL
A
UG/L
0.5
00031
INCDT LT
RFMNING
PEHCENT
2.0
0.8
-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SUfcvEY
EPA-LAS VEGAS
040805
37 44 40.0 110 27 00.0
LAKE POWELL
49037 ARIZONA
110291
DEPTH
2111202
CLASS 00
00010
OATE TIME DEPTH WATER
FROM OF TEMP
TO DAY FEET
75/04/16 09
09
09
09
09
09
09
'09
09
09
75/08/15 08
08
08
08
08
08
08
75/12/03 10
10
10
10
10
10
10
10
25
25
25
25
25
2b
25
25
25
25
30
30
30
30
30
30
30
05
05
05
Ob
05
05
05
05
0000
0005
0015
0025
0050
0100
0125
0150
01 ttS
0200
0000
0005
0020
0035
0065
0100
0145
0000
0005
0025
0070
0120
01 tQ
0190
0220
CENT
9.4
9.5
9.4
9.4
9.3
9.3
9.0
9.1
9.1
8.7
24.3
24.5
24.5
23.5
17.6
13.3
8.8
11.8
11.8
11.9
11.8
11.8
11.0
9.2
7.8
00300 00077 00094
DO ThANSP CNDUCTVY
SECCMI FIELD
MG/L INCHES MICROMHO
9.4
9.4
9.6
9.2
9.6
7.8
8.4
9.8
8.0
8.0
8.0
8.0
5.4
5.2
5.8
7.0
7.6
8.2
8.0
8.2
8.4
8.0
a.a
8.8
9.2
144 613
614
614
613
615
620
666
736
310
806
7B 723
716
725
972
490
541
744
156 609
595
641
632
629
631
637
633
00400 00410
PH T ALN
CAC03
SU
8.35
8.35
8.45
8.40
8.40
8.40
6.40
8.40
8.35
8.35
8.60
8.65
8.20
8.10
S.OO
8.00
8.10
8.00
8.00
8.10
8.10
8.10
8.10
8.10
8.10
MG/L
132
130
131
132
133
140
141
158
157
158
117
113
143
143
115
137
134
129
132
131
131
129
137
142
145
00610 00625 00630 00671
NH3-N TOT KJEL N02&N03 PMOS-DIS
TOTAL N N-TOTAL ORTrtO
MG/L
0.030
0.020
0.020
0.020
0.020
0.030
0.030
0.040
0.050
0.050
0.020
0.040
0.020K
0.050
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.020
0.020
MG/L
0.200K
0.200K
0.200K
0.200K
0.300
0.200K
0.200
0.200K
0.200K
0.200
0.400
0.400
0.300
0.400
0.300
0.500
0.300
0.200K
0.200K
0.200K
0.200
0.200*.
0.200
0.20 OK,
0.200K
MG/L
0.470
0.470
0.470
0.470
0.460
0.500
O.SOO
0.580
0.580
0.580
0.150
0.140
0.440
0.440
0.350
0.480
0.540
0.^30
0.420
0.6.30
0.430
0.420
0.470
0.490
0.510
MG/L P
0.014K
0.013K
0.012K
0.011K
0.013K
0.013K
0.014K
0.016J
0.018K
0.019J
0.003
0.003
0.002
0.003
0.008
0.027
0.015
0.003
0.003
0.002
0.002
0.002
0.004
0.003
0.003
* VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STORET RETRIEVAL DATE 7fo/ll/26
NATL EUTROPHICATION SURVEY
tPA-LAS VESAS
0*0805
37 44 40.0 110 27 00.0 3
LAKE POUELL
49037
1102*1
11EPALES 2111202
0999 FEET DEPTH CLASS 00
00665
UATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MQ/L P
75/04/16 09
09
09
09
09
0V
09
09
09
09
75/08/15 0«
06
08
08
08
08
08
75/13/03 10
10
10
10
10
10
10
10
25 0000
25 0005
25 0015
25 0025
25 0050
2b 0100
25 0125
25 0150
25 0185
25 0200
30 0000
30 0005
30 0020
30 0035
30 0065
30 0100
30 0145
05 0000
05 0005
05 0025
05 0070
05 0120
05 0170
05 0190
05 0220
0.012
0.010
0.010
0.009
0.010
0.012
0.011
0.017
0.017
0.020
0.012
0.012
0.011
0.010
0.015
0.050
0.025
0.010
0.010
0.012
0.010
0.010
0.015
0.014
0.024
32217
ChLRPHYL
A
UG/L
2.6
00031
INCDT LT
REMNING
PERCENT
4.7
1.5
-------
STORET RETRIEVAL DATE 76/11/36
NATL EUTROPHICAT10N SUKVEY
tPA-LAS VEGAS
00010 003UO
DATE TIME DEPTH «ATER DO
FHOM OF TEMP
TO DAY FEET CENT MG/L
75/04/16 10 35 0000 10.1 8.4
10 35 0005 10.1 9.6
10 35 0015 10.1 9.6
10 35 0025 9.9 9.2
10 35 0060 9.6 9.4
10 35 0070 9.1 9.4
10 35 0100 6.7 9.2
10 35 0120 8.1 9.0
7b/08/15 16 10 0000 27.1 8.0
16 10 0005 27.5 8.4
16 10 0022 26.5 3.8
16 10 0045 22.5 7.2
16 10 0085 17.0 5.4
16 10 0125 11.5 6.4
16 1U 0168 9.8 7.0
75/11/25 09 00 0000 14.1
09 00 0005 14.1 6.4
09 00 0015 14.1 7.4
09 00 0025 14.1 7.0
09 00 0038 14.1 7.4
75/12/03 15 15 0000 11.4 8.0
15 15 0005 11.5 7.2
15 15 002b 11.5 7.6
15 15 0060 11.6 7.8
15 15 0110 11.5 8.0
15 15 0145 10.2 7.»
00077
TKANS*
SECCrtI
INCHES
216
84
180
156
00094
CNOUCTVY
FIELO
MICROMHO
581
579
560
578
574
573
569
579
602
600
591
517
558
700
730
540
540
542
544
543
452
460
460
450
438
495
040806
37 30 00.0 110 44 00.0 3
LAIVE POWELL
49025 ARIZONA
110291
11EPALES
0126
00400
Prt
SO
8.45
8.45
8.45
8.40
8.40
8.40
8.3S
8.45
8.95
8.95
8.80
7.90
7.90
8.00
8.00
(5.00
8.00
8.00
8.00
8.00
8.00
FEET 0
00410
T ALK
CAC03
MG/L
127
127
127
130
129
127
128
127
106
107
108
113
119
140
143
121
119
118
117
118
119
118
117
117
120
122
DEPTH
211120*
H CLASS
00610
NH3-N
TOTAL
MG/L
0.040
0.020
0.020K
0.030
0.030
0.030
0.030
0.040
0.020K
0.020K
0.030
0.020
0.030
0.020
U.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00
00625
TOT KJtL
N
MG/L
0.600
0.300
0.300
0.200K
0.200K
0.300
0.300
0.200
0.300
0.200
0.300
0.200
0.200
0.200
o.<:oo
0.300
0.200K
0.200K
0.200K
0.200*.
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
00630
N02&N03
N-10TAL
MG/L
0.420
0.410
0.410
0.420
0.420
0.430
0.450
0.460
0.040
0.0*0
0.070
0.360
0.430
0.510
0.590
0.310
0.300
0.300
0.300
0.300
0.360
0.360
0.360
0.360
0.350
0.380
00671
PMOS-DIS
ORThlO
MG/L P
0.016K
0.012K
0.011J
0.016K
0.013K
0.011K
0.011
0.013K
0.012
0.012
0.005
0.011
0.014
0.007
0.007
0.005
0.002K
0.002K
0.003
0.002K
0.002K
0.002
0.002K
0.005
0.002
0.002
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STOutT WtTRIEVAL UATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040806
37 30 00.0 110 44 00.0 3
LAKE HOWELL
49025 ARIZONA
110291
11EPALES
0186 FEET
DEPTH
2111202
CLASS 00
DflTE
F*OM
TO
75/04/16
75/08/15
75/11/25
75/12/U3
TIME DEPTH
Of
DAY FEET
10 35
10 35
10 35
10 35
10 35
10 35
10 35
10 35
16 10
16 10
16 10
16 10
16 10
16 10
16 10
09 00
09 00
09 00
09 00
09 00
15 15
15 15
15 15
15 15
15 15
15 15
0000
0005
0015
0025
006Q
0070
0100
0120
0000
0005
0022
0045
0035
0125
0168
0000
0005
0015
0025
0036
0000
0005
0025
0060
0110
0145
00665 32217
PHOS-TOT CHLRPHYL
A
MG/L P UG/L
0.011 1.5
0.011
0.011
0.011
0.010
0.008
o.ooe
0.008
0.011 7.3
0.010
0.009
0.009
0.012
0.013
0.013
0.013 1.9
0.009
0.008
0.008
0.009
o.oo9 o.e
0.009
0.008
0.009
0.012
0.012
00031
IMCDT LT
RFMNING
PERCENT
-------
STOKET RETRIEVAL DATE 76/11/26
NATL EUTROPhlCATION SURVtY
EPA-LAS VEGAS
KATE TIME DEPTH
FrtOM OF
TO DAY FEtT
00010
TEMP
CENT
00300
00
MG/L
75/04/16
7b/0d/l4
75/12/02
13
13
13
13
13
13
08
08
08
08
08
08
08
08
06
08
08
08
08
08
08
08
30
30
30
30
30
30
25
25
25
25
25
25
25
25
25
15
15
15
15
15
15
15
0000
0025
0050
0075
0100
0130
0000
0005
0015
0025
0050
0100
0140
0185
0220
0000
0005
0030
0080
0110
0170
0215
10
10
8
a
8
7
23
23
23
23
17
13
9
7
5
11
11
12
12
12
12
9
.
.
.
.
.
•
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
4
0
6
2
0
3
7
9
6
8
3
0
5
5
7
5
4
6
6
6
5
7
7
9
9
9
8
8
7
7
7
7
6
6
4
5
5
7
7
7
7
7
6
2
.6
.8
.6
.2
.4
.2
.4
.a
«t>
.6
.8
.4
.2
.8
.0
.0
.2
.4
.6
.2
.4
.4
00077
TKANSP
StCCHl
INCHES
204
180
156
00094
CNOUCTVY
FIELD
MICHOMHO
589
582
564
565
570
583
937
930
936
934
802
720
679
674
708
609
609
604
604
603
625
648
0*0807
37 00 30.0 111 29 15.0 3
L*KE POKELL,
09025 ARIZONA
110291
HtPALES
0136
00400
PH
su
8. bO
8.45
8.40
B. 30
8.30
8.15
8.60
8.65
8.65
8.65
8.40
8.20
8.10
7.95
7.85
7.70
7.80
7.90
7. 90
7.90
7.90
7.80
FEET t)l
00410
T ALK
CAC03
MG/L
131
135
135
136
136
138
126
126
126
126
136
137
137
142
14?
119
119
121
121
124
13d
DEPTH
211
H CLASS
00610
NH3-N
TOTAL
MG/L
0.030
0.02 OK
0.020K
0.020K
0.030
0.020
0.020
0.020K
0.020
0.020
0.060
0.030
0.020
0.020K
0.020K
0.020
0.030
0.030
0.020
0.020K
0.020K
1202
00
00625
TOT KJEL
N
MG/L
0.500
O.JOO
0.200
0.200
0.200
0.200
0.300
0.300
0.300
0.400
0.400
0.300
0.400
0.200*
0.200*
0.200K
0.200K
0.200*
0.200K
0.400
0.200
0.200K
00630
N02&.N03
N-TOTAL
MG/L
0.360
0.360
0.380
0.390
0.410
0.470
0.160
0.170
0.160
0.170
0.290
0.370
0.410
0.480
0.540
0.260
0.260
0.260
0.260
0.310
0.510
00671
PHOS-DIS
OHTHO
MG/L P
0.016K
0.010J
0.013K
0.011K
0.022K
0.014
0.009
0.002K
0.010
0.010
0.010
0.010
0.010
0.006
0.010
0.002K
0.004
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STOHET RETRIEVAL DATE 76/11/26
foATL EUVROPHICATIOM SURVEY
EFA-LAS VEGAS
0*0807
37 00 30.0 ill 29 15.0 3
LAKE PdtaELL
*902b ARIZONA
110291
11EPALES E111202
0136 FEET OEHTh CLASS OC
DATE
F«OM
TO
75/04/16
75/08/14
75/12/02
0066t> 32217 00031
TIME OEPT" PHOS-TOT CHLKPriYL INCDT LT
Oh A RF.MNING
DAY FEET
13
13
13
13
13
13
08
08
08
08
08
08
08
08
08
08
08
08
08
00
08
08
30
30
30
30
30
30
25
25
25
25
25
25
25
25
25
15
15
15
15
15
15
15
0000
002b
0050
0075
0100
0130
0000
0005
0015
0025
0050
0100
0140
0165
0220
0000
0005
,0030
0080
0110
0170
0215
MG/L H Uti/L PEKCENT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.009
.010
.010
.008
.007
.004
.008 1.8
.007
.007
.009
.003
.008
.007
.009
.013
.007 0.7
.008
.008
.007
.006
.008
.006
-------
STOHET RETRIEVAL DATE 76/11/36
-IATL EUTKOPNICATION SURVEY
tPA-LAS VEGAS
UATE TIME DEPTH WATEK
FROM OF
TO DAY FEET CENT
75/04/16 1* 50 0000
1* 50 OOOb
14 50 0015
14 S>0 0025
14 50 0045
14 50 0065
14 5U OlUO
14 50 0140
040800
31 00 3b.O 111 18 20.0 3
LAKE POWELL
1102*1
11EPALES
0148 FEET
2111202
CLASS 00
10
K
P
T
9.8
9.8
9.8
9.8
9.7
8.5
8.3
7.6
00300
00
MG/L
10.0
9.»
9.2
9.0
7.6
8.0
6.2
9.<*
00077
TRANSP
StCCHI
INCHES
216
00094
CNDUCTVY
FIELD
MICROMHO
578
b7e
578
577
576
568
576
637
00400
PH.
SU
8.45
8.45
8.45
8.45
8.30
8.25
8.00
8.00
00410
T ALK
CAC03
MG/L
125
124
125
126
127
129
146
135
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020
0.020K
0.020
0.020
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.400
0.200K
0.200K
0.200K
0.200K
0.200*
0.400
0.400
00630
N02&N03
N-TOTAL
MG/L
0.400
0.400
0.&00
0.340
0.430
0.460
O.hOO
U.390
00671
PMOS-DIS
ORTrtO
MG/L P
0.013K
0.011K
0.015K
O.OHK
0.012K
0.015K
0.012K
0.011K
FROM
TO
00665
TIME DEPTH PhOS-TOT
OF
DAY FEET MG/L P
75/04/16 14 50 0000 0.011
14 50 0005 0.010
14 50 0015 0.009
14 50 0025 0.009
14 50 0045 0.009
14 50 00b5 0.008
14 50 0100 0.010
14 50 01<+0 0.010
32217
CHLh^HYL
A
UG/L
1.5
OOOJ1
INCDT LT
REMNING
PEKCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040809
37 53 45.0 110 12 40.0 3
LAKE POWELL
49037 ARIZONA
11EPALES 760109 2111202
0056 FEET DEPTH CLASS 00
U«Tfc TIME DEPTH
FKO* Of-
TO DAY FEET
00010
WATbK
TEMP
CENT
00300
GO
MG/L
75/04/28
75/08/1S
75/12/03
14
14
14
14
14
07
07
07
O/
07
09
09
09
09
09
55
55
55
55
55
40
40
40
40
40
30
30
30
30
30
0000
0005
0015
0030
0052
0000
0005
0015
0040
0066
0000
0005
0015
0060
0065
12
12
12
12
12
23
23
23
23
22
10
10
10
2
2
.6
.6
.3
.1
.0
.1
.3
.2
.2
.1
.0
.0
.0
.5
.2
8.
8.
8.
7.
8.
7.
7.
6.
7.
6.
8.
8.
9.
11.
11.
6
6
8
6
a
2
0
6
0
2
2
6
0
8
4
00077
TKANSP
SECCril
INCHES
8
23
84
00094
CNDUCTVT
FIELD
MICKOMHO
564
583
576
566
567
1186
1169
1169
1194
1086
665
665
629
577
579
094
CTVT
D
OMHO
564
583
576
566
567
1186
1169
1169
1194
1086
665
665
629
577
579
00400
PH
SU
8.00
8.00
8.00
7.80
7.90
8.50
8.55
8.55
8.50
8.40
7.60
7.90
7.90
8.00
8.00
00410
T ALK
CAC03
MG/L
137
140
134
134
136
157
157
157
158
155
136
138
138
157
158
00610
NH3-N
TOTAL
MG/L
0.060
0.040
0.050
0.050
0.050
0.040
0.040
0.040
0.050
0.060
0.020K
0.020K
0.020
0.040
0.040
00625
TOT KJEL
N
MG/L
0.800
0.400
0.300
0.300
0.400
0.500
0.500
0.500
0.400
0.500
0.200K
0.200K
0.200K
0.200
0.200
00630
N02kN03
N-TOTAL
MG/L
0.730
0.670
0.670
0.670
0.680
0.280
0.270
0.260
0.260
0.300
0.450
0.450
0.460
0.640
0.650
OOc/l
PMOi ois
ORT027
r'«24
" VJO
0002
0.003
Qfl03
0004
0<)04
DATE TIME DEPT
FROM OF
[0 DAY FEET
75/04/28
75/08/15
Y5/12/03
14
14
14
14
14
07
07
07
07
07
09
09
09
09
09
55
55
55
55
55
40
40
40
40
40
30
30
30
30
30
0000
0005
0015
0030
0052
0000
0005
0015
0040
0066
0000
0005
0015
0060
0085
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.144
.096
.048
.140
.175
.032
.032
• 0£d
.032
.036
.013
.013
.013
.016
.033
0
s
/
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
665
-TOT
L P
.144
.096
.048
.140
.175
.032
.032
• 028
.032
.036
.013
.013
.013
.016
.033
32217
CHLKPHYL
A
UG/L
2.0
23.6
1.4
00031
INCDT LT
REMNING
PEKCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STORET RETRIEVAL OATE 76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040610
37 32 05.0 110 39 07.0 3
LAKE POrtELL
49037 ARIZONA
11EPALES 76010V 2111202
0999 FEET DEPTH CLASS 00
OATE
FrtOM
TO
75/04/28
75/08/15
75/12/03
TIME
OF
DAY
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
30
30
30
30
30
30
30
30
30
45
45
45
45
45
45
45
45
45
05
05
05
05
05
05
05
DEPTH
FEET
0000
0005
0015
0030
0050
0100
0140
0180
0220
0000
0005
0025
0050
0065
0125
0165
0195
0225
0000
0005
0035
0060
0140
0160
0220
00010
MATER
TEMP
CENT
11.6
11.5
11.2
10.0
9.6
9.2
8.5
7.9
7.3
27.1
27.4
25.8
22.5
17.1
11.9
9.4
8.9
6.6
11.7
11.7
11.7
11.6
11.6
10.5
9.7
00300
00
MG/L
9.8
9.6
10.0
10.0
9.6
9.6
9.2
9.2
9.2
8.4
3.0
5.8
5.4
5.6
6.8
8.2
7.6
7.2
7.8
8.0
7.6
7.8
7.8
6.6
8.0
00077
TKANSP Cr
StCCHl FIELU
INCHES M]
162
96
216
94
TVY
MHO
580
56*
560
565
571
579
634
666
703
626
621
714
564
485
672
661
733
776
483
47V
465
477
465
775
738
00400
PH
su
8.30
8.40
8.30
8.30
8.30
8.30
8.20
8.20
8.20
8.95
6.90
6.10
7.90
7.90
8. 10
b.10
6.10
8.00
8.10
8.00
8.00
8.00
6.00
8.00
8.00
00410
T ALK
CAC03
MG/L
135
134
141
136
138
140
151
156
164
98
101
111
104
106
132
136
152
150
116
116
116
117
116
148
150
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.020
0.020
0.030
0.040
0.040
0.040
0.060
0.030
0.040
0.020
0.030
0.030
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
U.400
O.JUO
0.300
0.200
0.^00
0.200
0.300
0.200
U.200
0.200
0.200
0.200
0.200K
0.300
O.dOQ
0.200K
O.JOO
0.200
0.200K
O.efOOK
0.200K
0.200K
0.200K
0.200
0.200K
00630
N02fcN03
N-TOTAL
MG/L
0.410
0.400
0.400
0.410
0.430
0.460
0.520
0.580
0.640
0.060
0.060
0.280
0.360
0.390
0.
-------
STOrtET RETRIEVAL DATE. 76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040810
37 32 05.0 110 39 07.0 3
LAKE HOWELL
49037 ARIZONA
11EMALES 760109 2111202
0999 FEET OEHTH CLASS 00
DATE
FfcOM
TO
75/04/28
75/08/15
75/12/03
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF
DAY
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
FEET
30
30
30
30
30
JO
30
30
30
45
45
45
45
45
45
45
45
45
05
05
05
05
05
05
05
0000
0005
0015
0030
0050
0100
0140
0180
0220
0000
0005
0025
0050
0085
0125
0165
0195
0225
0000
0005
0035
0080
0140
0160
0220
A REMNING
MG/L P UG/L PERCENT
0.016 1.2
0.013
0.013
0.010
0.009
0.009
0.011
0.011
0.016
0.012 5.8
0.012
0.010
0.009
0.016
0.010
0.009
0.010
0.013
0.009 1.1
0.007
0.009
0.009
0.009
0.013
0.014
-------
STORET RETRIEVAL UATE 76/11/36
NATL EUTROPnICATION SURVEY
EPA-LAS VEGAS
040811
37 27 12.0 110 44 55.0 3
LAKE POWELL
49037 ARIZONA
11EPALES 760109 2111202
0999 FEET DEPTH CLASS 00
00010
00300
OATE
FROM
TO
75/04/29
75/08/15
75/12/03
TIME DEPTH 1
OF
DAY FEET
10
10
10
10
10
10
10
10
10
16
16
16
16
16
16
16
16
16
09
09
09
09
09
09
09
09
10
10
10
10
10
10
10
10
10
40
40
40
40
40
40
40
40
40
00
00
00
00
00
00
00
00
0000
0005
0015
0030
OObS
0080
0120
0170
0220
0000
0005
0025
0045
0075
0115
0155
0190
0225
0000
0005
0030
0080
0120
0160
0170
0230
iATtR
TtMP
CENT
11
11
11
10
10
8
8
7
7
27
27
25
23
15
12
9
8
8
11
11
11
11
10
lu
11
9
.5
.2
.0
.8
.3
.7
.2
.8
.1
.5
.8
.3
.9
.3
.7
.8
.9
.6
.8
.8
.8
.4
.8
.7
.2
.4
DO
MG/L
9
9
9
11
9
9
9
9
8
8
8
5
4
4
7
8
6
a
7
7
7
7
7
7
6
6
.8
.8
.8
.0
.8
.4
.4
.4
.8
.6
.8
.0
.2
.2
.2
.0
.2
.0
.6
.4
.4
.6
.6
.8
.2
.4
00077
TKANSP
StCCHI
INCHES
162
96
240
00094
CNDUCTVY
FIELD
MICROMHO
583
574
575
573
562
552
591
639
669
603
598
625
540
556
662
661
705
735
425
426
430
424
425
450
761
738
94
TVY
I
'MHO
583
574
575
573
562
552
591
639
669
603
598
625
540
556
662
661
705
735
425
426
430
424
425
450
761
738
00400
PH
SU
8.60
8.55
8.60
8.50
8.50
8.40
8.35
8.35
8.30
9.00
9.00
8.30
7.90
7.80
B.10
8.05
8.05
8.10
7.50
7.50
7.60
7.70
7.60
7.70
7.60
7.80
00410
T ALK
CAC03
MG/L
138
13B
139
137
138
137
144
13b
143
101
102
107
105
127
128
133
140
144
116
116
118
117
118
119
152
154
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.030
0.040
0.030
0.030
0.020
0.030
0.030
0.020
0.020
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.200
0.200
0.300
0.300
0.200K
0.200K
0.200
0.200K
0.200K
0.300
0.300
0.300
0.300
0.200
0.200
0.300
O.JOO
0.400
0.20 OK
0.200K
0.200K
0.200K
0.200
0.200K
0.200
0.200
00630
N02&N03
N-TOTAL
MG/L
0.380
0.390
0.390
0.390
0.400
0.440
0.500
0.560
0.620
0.040
0.020K
0.220
0.320
0.460
0.470
0.500
0.550
0.580
0.390
0.380
0.380
0.330
O.?70
0.290
0.600
0.600
00671
PHOS-OIS
ORTrlO
MG/L P
0.013J
0.003J
0.014K
0.014K
0.012K
0.006J
0.013K
0.015K
O.OOVJ
0.003
0.011
0.009
0.010
0.012
0.008
0.007
0.004
0.005
0.003
0.004
0.002
0.002K
0.002K
0.002
0.007
0.009
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPMlCATION SURVEY
EPA-LAS VEGAS
040811
37 27 12.0 110 44 55,
LAivE POWELL
49037 ARIZONA
0 3
HEPALtS 760109 2111202
0999 FEET DEPTH CLASS 00
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
75/04/29 10
10
10
10
10
10
10
10
10
75/08/15 16
16
16
16
16
16
16
16
16
75/12/03 09
09
09
09
09
09
09
09
10 0000
10 0005
10 0015
10 0030
10 0055
10 OObO
10 0120
10 0170
10 0220
40 0000
40 0005
40 0025
40 0045
40 0075
40 0115
40 0155
40 0190
40 0225
00 0000
00 0005
00 0030
00 0080
00 0120
00 0160
00 0170
00 0230
0.015
0.011
0.013
0.012
0.010
0.006
0.008
0.009
0.012
0.011
0.011
0.010
0.009
0.009
0.009
0.008
0.008
0.009
0.013
0.009
0.009
0.008
O.OOH
O.U10
0.018
0.021
32217
CHLHPHYL
A
UG/L
1.7
00031
INCDT LT
RPMNING
PERCENT
6.7
0.9
-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATXON SURVEY
EPA-LAS VEGAS
040812
37 17 43.0 110 52 30.0 3
LARE POKELL
49037 ARIZONA
11EPALES 760109 2111202
0152 FEET UEFTH CLASS 00
UATE TIME DEPTH
FROM OF
TO DAY FEET
00010
WATtft
TEMP
CtNT
00300
DO
MG/L
75/04/29
75/08/14
75/12/03
10
10
10
10
10
10
10
18
18
18
18
18
18
18
IB
18
15
15
15
15
15
15
15
00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
IS
30
30
30
30
30
30
30
0000
0005
0025
0040
0060
0120
0146
0000
0005
0025
0045
0075
0105
0145
0185
0225
0000
0005
0040
0060
0110
0150
0175
11
11
10
10
9
8
7
25
25
23
20
15
12
8
6
5
12
12
11
11
11
10
9
.1
.0
.3
.0
.2
.1
.1
.7
.6
.8
.1
.6
.6
.4
.5
.6
.2
.1
.8
.8
.8
.7
.6
9
10
10
9
9
9
9
7
8
7
5
6
6
7
6
6
7
7
7
6
7
6
6
.6
.0
.0
.6
.6
.2
.0
.2
.2
.4
.6
.6
.8
.4
.8
.2
.0
.0
.2
.6
.0
.0
.0
00077
TxANSP
StCCHI
INCHES
240
120
264
00094
CNDUCTVY
FIELD
MICKOMHO
755
761
744
766
773
837
827
597
559
507
578
646
650
651
672
425
416
406
404
402
520
530
94
TVY
MHO
755
761
744
766
773
837
827
597
559
507
578
646
650
651
672
425
416
406
404
402
520
530
00400
PH
su
8.50
6.50
8.55
6.40
8.40
8.25
6.25
9.00
9.00
8.45
8.10
a.io
8.10
8.10
8.10
8.20
8.00
7.90
8.00
7.90
7.90
7.80
7.90
00410
T ALK
CAC03
M6/L
120
120
122
124
124
136
140
101
101
99
115
126
126
132
1J3
13d
lib
115
112
112
112
132
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020
0.030
0.020
0.020
0.030
0.020K
0.020
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT HJtL
N
MG/L
0.500
0.300
0.400
0.400
0.400
0.200K
0.200
0.200
0.400
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.400
0.200K
0.200K
0.200K
0.200K
U.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.360
0.370
0.370
0.390
0.410
0.450
0.520
0.020
0.020K
0.080
0.400
0.480
0.460
0.460
0.500
0.540
0.350
0.380
0.360
0.350
0.350
0.520
00671
PHOS-OIS
ORTHO
MG/L P
0.005J
0.011J
0.012K
0.014K
0.012K
0.009K
0.009J
0.005
0.010
0.005
0.005
0.006
0.002
0.003
0.004
0.004
0.002K
0.002K
0.002
0.002K
0.002K
0.004
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO 8E IN ERROR
-------
STORET RETRIEVAL DATE 76/11/36
NATL EUTROPH1CATION SURVEY
EPA-LAS VEGAS
040812
37 17 43.0 110 52 30.0 3
LAKE HOXELL
49037 ARIZONA
11EHALES 7601U9 2111202
0152 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/29
75/08/14
75/12/03
TIME
OF
DAY
10
10
10
10
10
10
10
18
Id
18
18
18
18
18
18
18
15
15
15
15
IS
15
15
00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
15
30
30
30
30
30
30
30
DEPTH
FEET
0000
0005
0025
0040
OObO
0120
0148
0000
0005
0025
0045
0075
0105
0145
0185
0225
0000
0005
0040
0060
0110
0150
0175
00665 32217 00031
PHOS-TOT CHLHPnYL INCDT LT
A PENNING
MG/L P UG/L PERCENT
0.010 1.2
0.011
0.010
0.010
0.009
0.007
0.009
0.012 4.7
0.013
0.011
0.008
0.008
0.008
0.009
0.009
0.009
0.018 1.1
0.008
0.007
0.006
0.007
0.009
0.012
-------
STORtT RETRIEVAL UATE 76/11/26
NATL EUTROPHICATIGN SUHVEY
EPA-LAS VEGAS
040813
37 12 16.0 110 39 42.0 3
LAKE POWELL
4903T ARIZONA
11EPALES 760109 2111202
0160 FEET DEPTH CLASS 00
GATE
FHOM
TO
75/04/28
75/08/15
75/11/24
TIHE
OF
DAY
14
14
14
14
14
14
14
14
14
12
12
12
12
12
12
13
13
13
13
13
13
13
35
35
35
35
35
35
35
35
35
10
10
10
10
10
10
50
50
50
50
50
50
50
DEPTH
FEET
0000
0005
0010
0015
0025
0050
0090
0110
0155
0000
0005
0025
0050
0100
0135
0000
0005
0020
0039
0070
0100
0141
00010
MATER
TtMP
CENT
13.0
12.8
12.2
11*8
11.7
10.8
10.6
9.7
9.1
27.4
27.0
26.3
20.3
15.2
11.7
13.4
13.3
13.2
13.2
13.2
13.0
11.5
00300
DO
MG/L
9.8
9.2
9.4
9.4
9.6
9.4
8.8
8.0
8.0
8.4
B.U
8.0
6.8
5.6
6.0
7.4
7.2
7.0
7.2
7.2
7.2
4.2
00077
TRANSP
SECCHI
INCHES
204
96
7b
00094
CNDUCTYY
FIELD
MICROMHO
599
595
586
561
578
572
653
649
642
449
442
462
403
625
717
386
411
409
379
381
416
558
194
ITYY
1
IMHO
599
595
586
561
578
572
653
649
642
449
442
462
403
625
717
386
411
409
379
381
416
558
00400
PH
SU
B.50
8.50
8.40
8.40
8.40
8.20
8.40
8.20
8.30
9.00
8.95
8.90
8.00
8.00
8.00
7.20
7.10
7.00
7.10
7.20
7.00
7.10
00410
T ALK
CAC03
MG/L
120
120
121
120
117
116
127
126
128
75
76
78
94
119
132
112
112
109
105
105
110
131
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.020
0.020K
0.020K
0.020
0.040
0.090
0.060
0.020K
0.050
0.050
0.050
0.050
0.020K
0.020K
0.020K
0.020K
U.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.700
0.200K
0.200K
0.200K
0.200K
0.20 OK
0.200K
0.300
0.200
0.200
0.300
0.300
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.410
0.400
0.400
0.410
0.410
0.420
0.600
0.650
0.660
0.020K
0.030
0.020
0.290
0.440
0.590
0.290
0.290
O.?90
0.290
0.280
0.320
0.560
00671
PHOS-DIS
OHTHO
MG/L P
O.OOOR
0.015J
0.015J
0.017J
OoOlSJ
0.014K
0.019K
0.027J
0.020J
0.002
0.002
0.002
0.002
0.002
0.003
0.003
0.003
0.002
0.002
0.002
0.003
0.004
K VALUE KNOW) TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STORtT RETRIEVAL DATE 76/11/26
NATL EUTROPnICATION SURVEY
EPA-LAS VEGAS
040813
37 12 16.0 110 39 42.0 3
LANE. POHELL
49037 ARIZONA
UEPALES 760109 2111202
0160 FEET UEFTri CLASS 00
DATE
TO
OF
FEET
75/04/26
75/08/15
75/11/24
14 35
14 35
14 35
14 35
14 35
14 35
14 35
14 35
14 35
12 10
12 10
12 10
12 10
12 10
12 10
13 50
13 50
13 50
13 50
13 50
13 50
13 50
0000
0005
0010
0015
0025
0050
0090
0110
0155
0000
0005
0025
0050
0100
0135
0000
0005
0020
0039
0070
0100
0141
0.019
0.023
0.024
0.042
0.017
0.012
0.017
1.220
0.054
0.011
0.008
0.007
0.007
0.007
0.009
0.011
0.009
0.009
0.009
0.009
0.013
0.013
0665
S-TOT
/L P
0.019
0.023
0.024
0.042
0.017
0.012
0.017
1.220
0.054
0.011
0.008
0.007
0.007
0.007
0.009
0.011
0.009
0.009
0.009
0.009
0.013
0.013
32217 OOOJ1
CHLRPMYL INCUT LT
A REHNING
uo/L PERCENT
1.3
4.b
1.7
-------
STORET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SURVEY
tPA-LAS VEGAS
040814
37 10 23.0 110 54 17.0 3
LAKE HOUELL
49037 ARIZONA
11 El-ALES 760109 2111202
0999 FEET OEHTh CLASS 00
DATE
FROM
TO
75/04/28
/5/08/14
75/11/24
TIME
OF
OAY
15
15
15
IS
15
15
15
15
15
17
17
17
17
17
17
17
17
14
14
14
14
14
14
14
14
14
45
45
45
45
45
45
45
45
45
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
DEPTH
FEET
0000
0005
0025
0050
0060
0100
OlbO
0160
0200
0000
0005
0025
OObO
0090
0130
0165
0200
0000
0005
0025
0047
0060
0115
0155
0190
0230
00010
WATER
TEMP
CENT
10.8
10.6
10.2
10.0
9.9
8.6
7.4
6.7
6.2
24.1
23.8
23.5
18.7
14.0
9.1
7.2
5.9
13.1
13.2
13.2
13.2
13.1
13.0
10.4
8.9
7.5
00300
00
MG/L
9.6
9.8
9.8
9.6
9.6
9.2
8.8
8.4
8.6
7.6
7.4
5.0
6.6
7.0
7.4
7.6
5.6
7.8
7.2
8.2
7.2
7.0
6.6
6.6
7.0
6.8
00077
TKANSP
SECCfil
INCHES
240
138
240
00094
CNDUCTVY
FIELD
MICHOMHO
563
562
555
552
551
532
547
563
573
602
591
581
500
573
662
645
661
386
390
388
417
416
436
549
515
596
94
TVY
MHO
563
562
555
552
551
532
547
563
573
602
591
581
500
573
662
645
661
366
390
388
417
416
438
549
515
596
00400
i-H
su
8.30
H.40
8.40
8.40
8.30
8.10
8.10
8.20
8.20
8.70
8.85
7.95
7.90
6.00
B.Ob
8.00
8.85
7.20
7.20
7.10
7.10
7.20
7.10
7.10
7.20
7.00
00410
T ALK
CAC03
MG/L
119
120
121
122
126
132
137
141
144
102
102
102
118
126
131
133
104
106
112
111
111
100
113
125
129
13b
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.030
0.020K
0.020
0.020K
0.020
0.020
0.020
0.020
0.030
0.030
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00626
TOT KJtL
N
MG/L
0.200
0.200K
0.200K
0.200K
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.300
0.200
0.200*
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
00630
N028.N03
N-TOTAL
MG/L
0.390
0.380
0.390
0.390
0.390
0.440
0.500
0.540
0.580
0.060
0.050
0.240
0.440
0.460
0.450
0.540
0.300
0.320
0.320
0.320
0.310
0.380
0.500
0.530
0.580
00e>71
PHOS-OIS
ORTnO
MG/L P
O.OlbJ
0.013J
0.013J
0.015K
0.012J
0.011J
0.012K
0.0 16*
0.016K
0.009
0.002
0.011
0.012
0.011
0.011
0.012
0.009
0.003
0.002
0.003
0.002
0.002
0.002
0.004
0.005
0.007
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOKN TO BE IN ERROR
-------
STOKET RETRIEVAL DATE 76/11/26
NATL EUTROPHICATION SURVEY
tPA-LAS VEGAS
040614
37 10 23.0 110 54 17.0 3
LAKE POWELL
49037 ARIZONA
UEPALtS 76010*
0999 FEET DEPTH
2111202
CLASS 00
DATE TIME DEPTh
FROM OF
TO DAY FEET
75/04/28
75/08/14
75/11/24
15 45
15 45
15 45
15 45
15 45
15 45
15 45
15 45
15 45
17 30
17 30
17 30
17 30
17 30
17 30
17 30
17 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
14 30
0000
0005
0025
0050
0080
0100
0150
0160
0200
0000
0005
0025
0050
0090
0130
0165
0200
0000
0005
0025
0047
0080
0115
0155
0190
0230
0.015
0.013
0.013
0.014
0.012
0.011
0.010
0.012
0.013
0.011
0.009
0.009
0.011
0.009
0.008
0.009
0.012
0.008
0.008
0.008
0.008
0.008
0.007
U.OOH
0.012
0.013
0665 32217
S-TOT CHLRPHYL
A
/L P UG/L
0.015 0.9
0.013
0.013
0.014
0.012
0.011
0.010
0.012
0.013
0.011 5.3
0.009
0.009
0.011
0.009
o.ooa
0.009
0.012
0.008 1.9
o.ooa
0.008
0.008
0.008
0.007
U.OOH
0.012
0.013
00031
INCDT LT
REMN1NG
PERCENT
-------
STORET RETRIEVAL OATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040815
37 06 44.0 110 59 40.0 3
LAKE POWELL
49037 AK1ZONA
11EPALES 760109 2111202
0999 FEET OEHTH CLASS 00
DATE
FROM
TO
75/04/28
75/08/14
75/11/24
75/12/02
TIME DEPTH
OF
DAY
16
16
16
16
16
16
16
16
17
17
17
17
17
17
17
17
15
15
15
15
15
15
15
15
15
14
14
14
14
14
14
14
14
FEET
20
20
20
20
20
20
20
20
00
00
00
00
00
00
00
00
15
15
15
15
15
15
15
15
15
36
35
35
35
35
35
35
35
0000
0005
0025
0050
0080
0090
0150
0200
0000
0005
0015
0035
0060
0095
01J5
0170
0000
0005
0025
0042
0085
0130
0160
0190
0230
0000
0005
0035
0070
0130
0170
0210
0220
00010
MATtK
TEMP
CENT
11.2
11.1
11.1
10.7
10.5
8.9
6.9
6.3
24.4
24.8
24.8
21.5
15.7
12.3
9.1
7.0
13.0
13.0
13.0
13.0
13.0
11.7
10.2
8.7
7.4
11.7
11.8
11.7
11.7
11.5
9.4
8.3
7.6
00300
DO
MG/L
9.6
9.6
9.8
9.8
9.6
9.2
8.8
9.0
8.0
8.0
7.0
5.2
6.2
6.2
7.0
7.0
7.0
7.6
7.4
7.4
5.6
6.6
7.0
7.2
7.2
7.2
7.2
7.4
7.0
6.2
6.6
6.4
00077
TRANSP O
SECCHI FIELO
INCHES MI
252
144
240
372
94
TVY
MHO
567
561
591
682
700
700
570
509
619
665
637
391
401
400
396
395
501
502
556
577
409
416
421
414
493
553
545
514
004QO
PH
su
8.UO
8.50
8.50
8.40
8.30
8.10
8.20
8.40
8.90
8.90
8.95
a. 10
7.95
8.00
8.10
8.10
7.10
7.20
7.10
7.00
7.20
7.00
7.00
7.10
7.10
8.00
b.OO
8.00
a. oo
8.00
7.90
7.80
7.80
00410
T ALK
CAC03
MG/L
129
136
135
135
134
134
141
146
10?
106
108
104
106
119
129
130
106
109
110
lOtt
120
137
138
144
145
113
lib
115
115
117
134
136
138
00610
NH3-N
TOTAL
MG/L
0.020K
0.02UK
0.020K
0.020K
0.020K
0.020
0.020K
0.020K
0.020
0.020
0.020K
0.020
0.030
0.020
0.030
0.020
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
0.020
0.020K
0.020K
00625
TOT KJtL
H
MG/L
0.200K
O.^OOK
0.200
0.200K
0.200
0.200
0.200K
0.200
0.300
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*.
0.200K
0.200*.
0.200*
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200
00630
N02&N03
N-TOT4L
NG/L
0.380
0.370
0.370
0.370
0.380
0.420
0.550
0.600
0.120
0.100
0.100
0.240
0.380
0.160
0.460
0.470
0.320
0.310
0.300
0.300
0.300
0.450
0.480
0.530
0.590
0.330
0.320
0.320
0.320
0.360
0.530
0.580
0.590
00671
PHOS-OIS
0«TnO
MG/L P
O.Ol^K
0.013K
0.012K
0.003
0.002
0.003
0.003
0.012K
O.Oli
0.011
0.012
0.011
0.010
0.01U
0.006
0.012
0.007
0.003
0.002
0.002
0.002K
0.002K
0.002*
0.004
0.006
0.002K
0.002K
0.002*
0.002*
0.002K
0.005
0.005
0.005
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETfclEVA'w U6TE 76/H/26
MAIL EUTROPHICAT10W SURVEY
EPA-LAS VEGAS
040815
37 06 44.0 110 59 *C.O 3
LAKE PO*£LL
49037 ARIZONA
0999 FEET Dfe>TH CLASS 00
DATE
FHOM
TO
75/04/28
75/08/14
75/11/24
75/12/02
TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0005
16 20 0025
16 20 0050
16 20 0080
16 20 0090
16 20 OlbO
16 20 0200
17 00 0000
17 00 OOOb
17 00 0015
17 00 0035
17 00 0060
17 00 0095
17 00 0135
17 00 0170
15 15 0000
15 15 0005
15 15 0025
15 15 0042
15 15 0085
15 15 0130
15 15 0160
15 15 0190
15 15 0230
14 35 0000
14 35 0005
14 35 0035
14 35 0070
14 35 0130
14 35 0170
14 35 0210
14 35 0220
00665
PHOS-TOT
MG/L P
0.012
0.012
0.011
0.011
0.011
0.010
0.008
0.008
0.010
0.016
0.009
0.009
0.008
0.009
0.008
0.014
0.015
0.008
0.008
O.OOB
0.008
0.006
0.007
0.011
0.011
0.006
0.006
0.006
0.007
0.008
0.010
0.011
0.011
32217 00031
CHLwPHYL INCDT LT
A REMNING
UG/L PEKCENT
1.2
4.3
2.2
0.9
-------
STORE! RETRIEVAL DATt 7e>/l 1/26
MAIL EUTROPHICATION
EPA-LAS VEGAS
040810
37 15 53.0 110 25 57.0 3
LAKE POrfELL
49037 ARIZONA
11EPALES 760109 2111202
0030 FEET DEPTH CLASS 00
OATE
FrfOM
TO
75/04/28
75/08/15
75/11/24
TIME
OF
DAY
13 55
13 55
13 55
13 55
13 55
11 30
11 30
11 30
11 30
13 20
13 20
13 20
13 20
DEPTH
FEET
0000
0005
0010
0015
0026
0000
0005
0015
0028
0000
000?
0022
0032
00010
«AT£R
TEMP
CENT
13.5
13.7
13.3
13.0
11.7
25.6
25.9
25.2
23.5
9.9
9.7
9.1
*.o
00300
DO
MG/L
8.6
8.6
7.8
8.8
8.4
9.2
9.0
8.2
5.8
9.6
9.4
9.8
10.4
00077
TkANSP CN
SECCHI FIELD
INCHtS MI
12
60
54
94
TVY
MHO
471
475
468
596
57«
578
576
575
624
372
358
385
375
00400
PH
su
8.30
8.30
8.30
8.30
8.20
8.00
8.85
8.80
8.40
7.10
7.30
7.40
7.20
00410
T ALK
CACU3
HG/L
113
113
112
110
111
95
96
95
110
112
113
114
126
00610
NH3-N
TOTAL
MG/L
0.030
0.030
0.030
0.020
0.030
0.020K
0.060
0.020K
0.050
0.020K
0.020K
0.020K
0.020K
00625
TOT KJtL
N
MG/L
0.800
0.600
0.600
0.500
0.600
0.400
0.300
0.300
0.200
0.200K
0.200K
0.200K
0.200K
00630
N02kN03
N-TOTAL
MG/L
0.450
0.450
0.450
0.450
0.420
0.040
0.050
0.040
0.340
0.170
0.160
0.150
0.460
00b71
PHOS-DU
OUTHO
MG/L f
O.OSi>
O.OZ'O
0.02f>
0.02t_,
O.Oix.,
0.00'
0.02>
0.00*-
0.02,
0.00
O.OOr
O.OOr
O.OU
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/04/28 13 55 0000
13 55 0005
13 55 0010
13 55 0015
13 55 0026
75/08/15 11 30 0000
11 30 0005
11 30 0015
11 30 0028
75/11/24 13 20 0000
13 20 0005
13 20 0022
13 20 0032
0665
S-TOT
/L P
0.077
O.ObO
0.049
0.054
0.075
0.029
0.025
0.022
0.026
0.022
0.020
0.017
C.067
32217
CHLRPHYL
A
UG/L
1.5
8.7
9.2
00031
INCDT LT
REMNING
PEKCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STOHET RETRIEVAL JATE 76/11/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040817
37 20 54.0 110 56 10.0
LAKE HOWELL
49025 ARIZONA
11EPALES 760109 2111202
0160 FEET DEPTH CLASS 00
UATE
FHOM
TO
75/04/29
75/08/15
75/12/04
TIME
OF
DAY
09
09
09
09
09
09
09
18
18
18
18
18
18
18
18
09
09
09
09
09
09
09
10
10
10
10
10
10
10
20
20
20
20
20
20
20
20
45
45
45
45
45
45
45
DEPTH
FEET
0000
0005
0020
0030
0050
0100
0155
0000
0005
0020
0050
0070
0110
0150
0191
0000
0005
0020
0080
0120
0140
0180
00010
MATEH
TfcMP
CENT
12.1
12.0
10.6
9.6
8.8
7.7
8.6
27.9
27.4
27.0
21.0
18.7
12.8
9.1
8.7
11.8
11.8
11.8
11.8
11.4
10.6
8.7
00300
00
MG/L
9.6
9.6
10.0
9.8
9.0
7.2
2.7
8.4
8.6
8.4
4.8
3.2
5.6
4.0
1.2
6.8
7.2
6.8
6.8
6.6
5.6
8.2
00077
THAixSP
SECCHI
INCHES
204
120
180
00094
CNDUCTVY
FIELD
MICROMHO
579
599
591
747
741
736
997
163
760
755
555
706
607
578
655
415
416
425
419
409
477
482
94
TVY
MHO
579
599
591
747
741
736
997
163
760
755
555
706
607
578
655
415
416
425
419
409
477
462
00400
PH
SU
8.20
8.35
8.40
8.20
8.25
8.00
7.80
8.60
8.75
7.90
7.80
7.80
7.80
7.70
7.50
7.80
7.80
7.80
7.80
7.80
7.60
7.50
00410
T ALK
CAC03
MG/L
123
121
119
119
119
120
143
110
109
111
117
133
136
141
151
120
120
118
119
119
127
134
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.020K
0.020
0.020
0.020
0.020
0.030
0.030
0.030
0.030
0.020
0.030
0.050
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0062b
TOT KJtL
N
MG/L
0.300
0.200K
0.300
0.400
0.400
O.«00
0.300
0.600
0.200
0.200
0.300
0.200
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200
00630
N02&N03
N-TOTAL
MG/L
0.160
0.140
0.200
0.290
0.350
0.350
0.540
0.100
0.110
0.100
0.350
0.370
0.360
0.400
0.400
0.300
0.290
0.290
0.300
0.230
0.440
0.420
00o71
PHOS-OIS
U»TrlO
MG/L "
0.014K
0.011J
0.013J
0.012J
0.011J
0.003J
0.014J
0.012
0.007
0.002K
0.002K
0.002K
0.006
0.019
0.029
0.002K
0.003
0.002K
0.002K
0.002K
0.002K
0.005
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STORE! KtTHIEVAL UATt 76/11/26
NATL EUTROPH1CATION SUHVEY
EPA-LAS VEGAS
040617
37 20 54.0 110 56 10.0 3
LAKE POKELL
49025 ARIZONA
UEHAL.es 760109 2111202
0160 FEET OE^Trt CLASS 00
DATE
TO
75/04/29
75/08/15
75/12/04
TIME DEPTH
OF
DAY FEET
09
09
09
09
09
09
09
18
18
18
18
18
18
18
18
09
09
09
09
09
09
09
10
10
10
10
10
10
10
20
20
20
20
20
20
20
20
45
45
45
45
45
45
45
0000
0005
0020
0030
0050
0100
0155
0000
0005
0020
OObO
0070
0110
0150
0191
0000
0005
0020
0080
0120
0140
0180
066S 32217
S-TOT CHLHPHYL
A
/L P OG/L
0.011 1.5
0.013
0.018
0.013
0.018
0.009
0.019
0.009 3.9
0.011
0.009
0.008
0.007
0.008
0.024
0.046
0.009 0.9
0.006
0.008
0.009
0.009
0.009
0.069
00031
INCDT LT
REMNING
PERCENT
-------
STORET RETRIEVAL GATE 76/11/26
NATL EUTROPhlCATION SURVEY
EPA-LAS VEGAS
040818
37 33 13.0 110 46 29.0 3
LAKE POWELL
49017 ARIZONA
11EPALES 760109 2111202
0056 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/29
75/06/15
75/11/25
75/12/02
TI*E DEPTH
Of
DAY
09
09
09
09
09
15
Ib
15
15
15
10
10
10
10
10
14
14
14
14
FEET
30
30
30
30
30
30
30
30
30
30
50
50
50
50
50
35
35
35
35
0000
0005
0015
0030
0052
0000
0005
0025
0045
0070
0000
0005
0015
0025
0036
0000
0005
0030
0065
00010
4ATER
TEMP
CENT
10.5
10.5
9.7
9.1
9.1
27.4
27.4
25.9
22.9
19.1
13.6
12.4
12.4
12.4
12.4
11.2
11.2
11.0
10.6
00300
00
MG/L
9.6
9.6
9.6
9.6
9.4
8.0
7.8
5.8
2.4
1.8
5.6
7.8
7.8
7.8
8.2
8.2
8.4
8.2
00077
TKANSP
stccm
INCHES
162
72
120
174
00094
CNOUCTVY
FIELD
MICHOMHO
575
570
558
550
550
600
599
580
533
590
428
425
412
415
413
440
430
417
412
94
TVY
MHO
575
570
558
550
550
600
599
580
533
590
428
425
412
415
413
440
430
417
412
00400
PH
SU
8.50
8.50
8.45
8.40
8.40
8.95
8.95
8.60
7.80
7.65
8.10
8.10
8.10
8.10
00410
T ALK
CAC03
MG/L
140
137
138
137
139
108
107
107
110
123
116
lit)
115
120
121
115
116
117
113
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020
0.020
0.030
0.020
0.030
0.040
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.400
0.200
0.200
0.200
0.200K
0.300
0.400
0.400
0.300
0.300
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.410
0.410
0.420
0.430
0.430
0.300J
0.020K
0.080
0.280
0.400
0.280
0.280
0.280
0.280
0.270
0.320
0.310
0.310
0.300
00671
PHOS-DIS
O^THO
M6/L P
0.012*
0.012*
0.012*
0.011*
O.Ollu
0.005
O.OOS
0.004
0.012
0.013
0.004
0.002*
0.00£<
0.002*
0.002*
0.002r
O.OOfct
0.002r
0.002r
1)0665 32217 00031
DATE
FROM
TO
75/04/29
75/08/15
75/11/25
75/12»«02
TIME DEPTH
OF
DAY
09
09
09
09
09
15
15
15
15
15
10
10
10
10
10
14
14
FEET
30
30
30
30
30
30
30
30
30
30
50
50
50
50
50
£5
35
0000
0005
0015
0030
0052
0000
0005
0025
0045
0070
0000
0005
0015
0025
0036
0000
0005
PHOS-TOT CHLRPHYL INCDT LT
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
A REMNING
P UG/L PEHCENT
Oil 1.5
Oil
010
009
Oil
Oil 6.3
012
013
010
030
013 2.1
009
009
010
Oil
009 1.3
0.010
« n F /"•
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE IN ERROR
-------
STOWET RETRIEVAL DATE 76/11/36
NATL EUTHOPHICATION SURVEY
EPA-LAS VEGAS
040819
37 01 03.0 111 19 40.0 3
LAKE KO«£LL
49037 ARI^UNA
11EPALES 760109 2111302
0999 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/29
75/08/14
75/12/02
TIME
OF
DAY
11
11
11
11
11
11
11
IS
15
15
15
15
15
15
15
15
13
13
13
13
13
13
13
13
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
35
35
35
35
35
35
3b
35
DEPTH
FEET
0000
0005
0030
0060
0100
0150
0250
0000
0005
0020
0040
0070
0110
0150
0190
0225
0000
0005
0035
0080
0130
0170
0200
0220
00010
MATER
TEMP
CENT
10.9
10.8
10.4
9.8
8.4
7.3
6.8
25.7
25.4
25.0
19.2
16.1
12.2
9.3
7.1
5.8
12.4
12.2
12.2
12.1
12.0
9.7
8.3
7.2
00300
00
MG/L
9.8
9.4
9.4
9.0
8.0
4.4
6.6
8.0
8.8
9.2
6.8
6.1
6.0
7.4
5.4
6.8
7.4
6.2
7.0
7.0
7.0
6.0
6.2
6.4
00077
TrtANSP
SECCHI
INCHES
204
204
324
00094
CNDUCTVY
FIELD
MICROMHO
791
801
784
826
897
931
994
929
931
921
672
645
595
644
632
670
488
493
520
480
520
519
508
508
94
TVY
MHO
791
801
784
826
897
931
994
929
931
921
672
645
595
644
632
670
488
493
520
480
520
519
508
508
00400
PM
su
B.50
8.50
8.40
8.20
8.00
8.00
8.00
8.65
8.70
8.70
8.70
8.35
8.15
8.10
8.05
8.00
8.00
8.00
8.00
8.00
8.00
7.90
7.80
7.80
00410
T ALK
CAC03
MG/L
13V
139
137
140
141
152
155
118
125
11V
119
116
119
128
130
135
135
138
122
122
121
130
131
134
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.040
0.040
0.020
0.020K
0.050
0.020
0.020
0.020
0.020K
0.020K
0.020K
0.020K
U.020K
0.020K
0.020K
0.020K
0062b
TOT KJEL
N
MG/L
0.300
0.300
0.200
0.200
0.200
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200
0.200
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
0.380
0.380
0.400
0.400
0.480
0.630
0.660
0.190
0.400J
0.200
0.190
0.350
0.430
0.430
0.490
0.560
0.520
0.560
0.310
0.280
0.300
0.480
0.520
0.560
00671
PHOS-DIS
ORThO
MG/L P
0.010K
0.011K
0.013K
0.004
0.003
0.012K
0.016K
0.002
0.010
0.010
0.011
0.002
0.009
0.008
0.010
0.012
0.002K
0.002K
0.002K
0.002*
0.002K
0.002K
0.002K
0.002K
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOKfcT KETRIEVAL DATE 76/11/36
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
040819
37 01 03.0 111 19 40.0 3
LAKE POWELL
49037 ARIZONA
11EPALES 760109 2111202
0999 FEET DEPTH CLASS 00
DATE
FKOM
TO
75/04/25
75/08/14
75/12/02
TIME DEPTH
OF
DAY
11
11
11
11
11
11
11
15
15
15
15
15
15
15
15
15
13
13
13
13
13
13
13
13
FEET
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
35
35
35
35
35
35
35
35
0000
0005
0030
0060
0100
0150
0250
0000
0005
0020
0040
0070
0110
0150
0190
0225
0000
0005
0035
0080
0130
0170
0200
0220
00665 32217 00031
PHOS-TOT CHLRPHYL INCDT LT
A REMNING
MS/L P UG/L PEHCENT
0.009 1.3
0.009
0.010
0.010
0.008
0.007
0.013
0.008 2.7
0.008
0.007
0.008
0.011
0.008
0.006
0.008
0.009
0.005 1.5
0.006
0.006
0.006
0.007
0.005
0.006
0.006
------- |