U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
CHERRY CREK LAKE
ARAPAHOE COUNTY
COLORADO
EPA REGION VIII
WORKING PAPER No, 768
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
CHERRY CREK LAKE
ARAPAHOE COUNTY
COLORADO
EPA REGION VIII
WORKING PAPER No, 768
WITH THE COOPERATION OF THE
COLORADO DEPARTMENT OF HEALTH
AND THE
COLORADO NATIONAL GUARD
JUNE, 1977
-------
CONTENTS
4 Page
Foreward ii
List of Colorado Study Lakes and Reservoirs iv
Lake and Drainage Area Maps v, vi
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings • 8
V. Literature Reviewed ' 12
VI. Appendices 13
-------
ii
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, concentrations,
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 non-point
source pollution abatement in lake watersheds.
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.
t
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 water-
shed 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 condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water 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 EPA
and to augment plans implementation by the states.
ACKNOWLEDGEMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Colorado Department of
Health for professional involvement, to the Colorado National
Guard for conducting the tributary sampling phase of the Survey,
and to those wastewater treatment plant operators who voluntarily
provided effluent samples.
The staff of the Water Quality Control Division provided
Invaluable lake documentation and counsel during the Survey,
reviewed the preliminary reports, and provided critiques most
useful 1n the preparation of this Working Paper series.
Lt. Colonel Paul A. Parsons, the Deputy Adjutant General of
Colorado, and Project Officer Colonel Hershel C. Yeargan, who
directed the volunteer efforts of the Colorado National Guardsmen,
are also gratefully acknowledged for their assistance to the Survey.
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1v
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES AND RESERVOIRS
STATE OF COLORADO
NAME
Barker
Barr
Blue Mesa
Cherry Creek
Cucharas
Dtllon
Grand
Green Mountain
Hoi brook
Meredith
Milton
Navajo
Shadow Mountain
COUNTY
Boulder
Adams
Boulder
Arapohoe
Huerfano
Summit
Grand
Summit
Otero
Crowley
Weld
Archuleta, CO; San
Juan, Rip Arriba, NM
Grand
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104°52'
104°50'
X 39040'—1
B1
CHERRY CREEK LAKE
Tributary Sampling Site
X Lake Sampling Site
, * Land Subject to Inundation
2 Km.
1
1^2
Scale
1 Mi.
39°38'
39 36—I
V
-------
V1
CHERRY CREEK LAKE
Tributary Sampling Site
X Lake Sampling Site
Land Subject to Inundation
-------
CHERRY CREEK LAKE
STORET NO. 0804
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Cherry Creek Lake is eutrophic.
It ranked seventh in overall trophic quality among the 13 Color-
ado lakes and reservoirs sampled in 1975 when compared using
a combination of six water quality parameters*. Seven of the
water bodies had less median total phosphorus, six had less
median dissolved orthophosphorus, none had less but six had the
same median inorganic nitrogen, eight had less mean chlorophyll
a_, and nine had greater mean Secchi disc transparency.
Survey limnologists noted emergent aquatic macrophytes
along the shoreline in August. The high chlorophyll ^concen-
tration at station 2 in August (124.6 yg/1) is indicative of an
algal bloom. However, the numbers of phytoplankton in the August
sample composited from the three stations indicate probable wind-
concentration of the algae at station 2 (see page 6).
B. Rate-Limiting Nutrient:
The algal assay results indicate that Cherry Creek Lake was
nitrogen limited at the time the sample was collected (05/07/75).
The reservoir data indicate nitrogen limitation at all sampling
stations and times.
C. Nutrient Controllability:
1. Point sources—No known wastewater treatment plants im-
pacted the reservoir during the sampling year. Septic tanks serving
shoreline parks and campgrounds were estimated to have contri-
* See Appendix A.
-------
2
buted 0.1% of the total phosphorus load to Cherry Creek Lake
during the sampling year, but a shoreline survey would have to
be done to determine the actual inputs from those sources.
The present phosphorus loading of 1.53 g/m2/year is six
times that proposed by Vollenweider (Vollenweider and Dillon,
1974) as a eutrophic loading (see page 11). It is calculated
that this input would have to be reduced by 84% to significantly
improve the trophic condition of the reservoir. This would involve
minimization of phosphorus loads from all non-point sources.
2. Non-point sources—Non-point sources accounted for
99.9% of the total phosphorus load during the sampling year.
Cherry Creek contributed 98.5%, Cottonwood Creek contributed
0.2%, and the ungaged minor tributaries and immediate drainage
contributed an estimated 0.1%.
Land use in the drainage basin is largely agricultural. An
additional investigation is needed to determine the contribution
and controllability of nutrients resulting from land-use prac-
tices such as turf farming in the Cherry Creek drainage (Anderson,
1977).
-------
II. RESERVOIR AND DRAINAGE BASIN CHARACTERISTICS1"
A. Morphometry :
1. Surface area: 3.24 kilometers2.
2. Mean depth: 5.2 meters.
3. Maximum depth: 7.6 meters.
4. Volume: 16.751 x 106 m3.
5. Mean hydraulic retention time: 3.6 years (based on outflow)
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Cherry Creek 932.4 0.196
Cottonwood Creek 20.1 0.008
Minor tributaries &
immediate drainage - 41.4 0.004
Totals 993.9 0.208
2. Outlet -
Cherry Creek 997.1** 0.147
C. Precipitation***:
1. Year of sampling: 42.3 centimeters.
2. Mean annual: 32.9 centimeters.
t Table of metric conversions—Appendix B.
tt Anderson, 1974.
* For limits of accuracy, see Working Paper No. 175, "...Suryey Methods,
1973-1976".
** Includes area of reservoir.
*** See Working Paper No. 175.
-------
III. LAKE WATER QUALITY SUMMARY
Cherry Creek Lake 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 two or
more depths at three stations on the reservoir (see map, page v). During
each visit, a single depth-integrated (4.6 m or near bottom to surface),
sample was composited from the stations for phytoplankton identification
and enumeration; and during the first visit, a single 18.9-liter depth-
integrated sample was composited for algal assays. Also each time, a
depth-integrated sample was collected from each of the stations for
chlorophyll a^ analysis. The maximum depths sampled were 5.5 meters at
station 1, 3.0 meters at station 2, and 4.6 meters at station 3.
The sampling results are presented in full in Appendix D and are
summarized in the following table.
-------
PARAMETER
TEMP (c>
OISS OXY (MG/D
CNDCTVY (MChiOMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02»N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (Ur,/L)
SECCHI (METERS)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING < 5/ 7/75)
3 SITES
RANGE
9.7 - 10.3
7.6 - 8.2
377. - 382.
8.5 - 8.7
175. - 176.
C.Obl - 0.070
0.009 - 0.011
0.020 - 0.03C
0.030 - 0.040
0.800 - 0.900
0.050 - 0.060
0.820 - 0.930
2.3 - 13.2
0.8 - 0.9
CHEMICAL c*Ar
-------
B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
05/07/75
08/22/75
10/09/75
2. Chlorophyll a^ -
Sampling
Date
05/07/75
08/22/75
10/09/75
Dominant
Genera
1. Chroomonas (?) sp.
2. Cryptomonas sp.
3. Stephanodiscus sp.
4. Navicula sp.
5. Ankistrodesmus sp.
Other genera
Total
1.
2.
3.
4.
5.
Fragilaria sp.
Diatoma sp.
Navicula sp.
Stephanodiscus sp.
Cryptomonas sp.
Other genera
Total
1. Trachelomonas sp.
2. Cryptomonas sp.
3. Ankistrodesmus sp.
4. Stephanodiscus sp.
5. Melosira s£.
Other genera
Total
Station
Number
1
2
3
1
2
3
1
2
3
Algal Units
per ml
841
342
156
31
31
280
1,681
920
920
307
184
184
367
2,882
373
248
124
41
41
84
911
Chlorophyll a
(ug/D
12.8
13.2
2.3
9.8
124.6
11.6
14.2
9.8
11.6
-------
0.015
0.065
0.065
0.015
0.090
0.090
1.090
1.090
3.2
3.9
28.9
4.5
7
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum yield
Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/l-dry wt.)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
2. Discussion -
The control yield of the assay alga, Selenastrum cajjri-
cornutum indicates that the potential primary productivity
of Cherry Creek Lake was moderately high at the time the
sample was taken (05/07/75). Also, the lack of significant
growth response with the addition of phosphorus until nitro-
gen was also added in combination indicates that the reservoir
was limited by nitrogen at that time. Note that the addition
of nitrogen alone resulted in a yield significantly greater
than that of the control.
The reservoir data also indicate nitrogen limitation. The
mean inorganic nitrogen/orthophosphorus ratios were 9/1 or
less at all sampling stations and times, and nitrogen limi-
tation would be expected.
-------
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Colorado 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 month of June when two samples were collected. Sampling was be-
gun in September, 1974, and was completed in August, 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the Colorado District Office of the U.S. Geological Survey for the tri-
butary sites nearest the reservoir.
In this report, nutrient loads for unsampled tributaries were cal-
culated using mean annual concentrations and mean annual flows. Nutrient
loads for unsampled "minor tributaries and immediate drainage" ("ZZ" of
U.S.G.S.) were estimated using the mean concentrations in Cottonwood
Creek at station E-l and the mean annual ZZ flow.
No known wastewater treatment plants impacted Cherry Creek Lake
during the sampling year.
-------
9
A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source yr total
a. Tributaries (non-point load) -
Cherry Creek 4,870 98.5
Cottonwood Creek 10 0.2
b. Minor tributaries & immediate
drainage (non-point load) - 5 0.1
c. Known municipal STP's - None
d. Septic tanks* - 5 0.1
e. Known industrial - None
f. Direct precipitation** - 55 1.1
Total 4,945 100.0
2. Outputs -
Reservoir outlet - Cherry Creek 745
3. Net annual P accumulation - 4200 kg.
* Estimate based on 3 campgrounds and 2 parks; see Working Paper No. 175.
** See Working Paper No. 175.
-------
10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Cherry Creek 22,345 84.8
Cottonwood Creek 165 0.6
b. Minor tributaries & immediate
drainage (non-point load) - 85 0.3
c. Known municipal STP's - None
d. Septic tanks* - 245 1.0
e. Known industrial - None
f. Direct precipitation** - 3,500 13.3
Total 26,340 100.0
2. Outputs -
Reservoir outlet - Cherry Creek 6,870
3. Net annual N accumulation - 19,470 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/ktn2/yr
Cherry Creek 5 24
Cottonwood Creek <1 8
* Estimate based on 3 campgrounds and 2 parks; see Working Paper No. 175,
** See Working Paper No. 175.
-------
11
E. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his "dangerous" loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his "permissible" loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between "dangerous"
and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/m2/yr 1.53 1.30 8.1 6.0
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Cherry Creek Lake:
"Dangerous" (eutrophic loading) 0.24
"Permissible (oligotrophic loading) 0.12
-------
12
V. LITERATURE REVIEWED
Anderson, R. Dennis, 1974. Personal communication (waterbody in-
formation and morphometry). CO Dept. of Health, Denver.
_, 1977. Personal communication (review of preliminary
report). CO Dept. of Health, Denver.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
• the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Water, Burlington, Ontario.
-------
13
VI. APPENDICES
APPENDIX A
LAKE RANKINGS
-------
LAKE
CODE
OB01
0802
0803
0804
0805
0806
0807
0808
0809
oeio
0811
0812
0313
TO BE OS«:D !* R4^Jf«'
LAKE NAME
BACKER RESERVOIR
BARK LftKE
BLUE MESA RESERVOIR
CHERRY CREEK LAKE
CUCHARAS RESERVOIR
DILLON RESERVOIR
GRAND LAKE
GREEN MOUNTAIN RESERVOIR
HOLBROOK LAKE
LAKE MEREDITH
MILTON RESERVOIR
NAVAJO RESERVOIK
SHADOW MOUNTAIN LAKE
MEDIAN
TOTAL P
0.023
0.930
0.019
0.054
0.263
0.009
0.013
0.010
0.329
0.397
0.846
0.036
0.020
MEDIAN
INORO N
0.045
1.090
0.040
0.040
0.040
0.040
0.040
0.040
0.073
0.110
2.280
0.050
0.040
500-
MEAN SEC
419.000
451.333
395,750
469.333
490.000
181.750
366.500
391.167
490.333
489.667
429.333
479.400
427.000
MEAN
CrtLORA
5.333
2*. 767
6.817
23.322
27.400
3.150
4.900
5.833
111.933
164.678
5.900
2.180
5.700
15-
MIN 00
9.400
10.200
13.800
10.000
14.800
9.200
10.200
9.100
9.000
10.400
9.200
10.000
9.200
MEDIAN
OISS OKTHO
0.006
0.730
0.005
0.00?
0.015
0.002
0.003
0.002
0.026
0.098
0.808
0.013
0.003
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LAKE
CODE
0801
OR02
0803
0804
0805
0806
0807
0808
0809
0810
0811
0812
0813
OF LAKES HIT* HIGHER VAl.iiES 'NUHbPrt OF LftKtS
LAKE NAME
BARKER RESERVOIR
BASS LAKE
BLUE MESA RESERVOIR
CHERRY CREEK LAKE
CUCHARAS RESERVOIR
DILLON RESERVOIR
GRAND LAKE
GREEN MOUNTAIN RESERVOIR
HOLBROOK LAKE
LAKE MEREDITH
MILTON RESERVOIR
NAVAJO RESERVOIR
SHADOW MOUNTAIN LAKE
VALUED)
MEDIAN
TOTAL P
58 t
0 (
75 (
42 <
33 1
100 1
83 <
92 <
?5 <
17 (
8 I
50 <
67 (
! 7)
: 0)
1 9)
[ 5)
: 4>
; 12)
: 10)
: ii>
; 3)
2)
i)
6)
8)
MEDIAN
INORG N
42 <
8 (
87 <
87 <
58 (
58 <
87 (
58 <
25 (
17 (
0 (
33 (
87 (
5)
1)
9)
9)
6)
6)
9)
6)
3)
2)
0)
4)
9)
500-
MEAN SEC
67 1
42 1
75 1
33 (
8 (
100 1
92 1
83 (
0 I
17 (
50 (
25 (
58 (
! 8)
! 5)
1 V)
[ 4)
: i)
: 12)
: ID
: io>
: o>
2)
6)
3)
7)
MEAN
CHLOHA
75 i
17 i
42 i
33 i
25 i
92 i
83 i
58 <
d (
0 <
SO 1
100 1
67 (
I 9)
! 2)
I 5)
( 4)
I 3)
1 ID
1 10)
I 7)
I 1)
I 0)
! 6)
12)
; 8)
15-
MIN DO
58 l
29 i
8 1
46 1
0 1
75 1
29 (
92 (
100 1
17 (
75 (
46 (
75 (
[ 7)
! 3t
1 1)
! 5)
I 0)
! 8)
[ 3)
: ID
; 121
2)
8)
5)
8)
MEDIAN
DISS ORTHO P
S3 i
8 l
67 1
50 (
33 <
96 1
79 <
96 1
25 (
17 <
0 (
42 <
79 (
1 7)
I 1)
! 8)
1 6)
I 4)
! 11)
1 9)
! 11)
I 3)
: 2>
, 0)
5) .
9)
INDEX
NO
358
104
354
291
157
521
453
479
183
85
1*3
296
433
-------
LAKES RANKED 8Y INDEX NUS.
RAJNK LAKE CODE LAKE NAME INDEX NO
1 0806 DILLON RESEHVOIK 521
2 0808 GREEN MOUNTAIN *ESE»VOIR 479
3 0807 GRAND LAKE 453
4 0813 SHADOM MOUNTAIN LAKE 433
5 0801 BARKER RESERVOIR 358
6 0803 BLUE MESA RESERVOIR 354
7 0812 NAVAJO RESERVOIR 296
8 0804 CHERRt CREEK LAKE 291
9 OS11 MILTON RESERVOIR 183
10 0809 HOL3ROOK LAKE 183
11 0805 CUCHARAS RESERVOIR 157
12 0802 BARR LAKE 104
13 0810 LAKE MEREDITH 85
-------
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"4 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
4
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR COLORADO
12/07/76
LAKE CODE 0604
TOTAL O&AIMAGE AREA OF LAKMSQ KM)
SUP-O=AINAC;E
TRIBUTARY A»EA(50 KM)
JAN
FEB
997.1
MAR
APR
MAY
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCT
NOV
OEC
MEAN
OB04A1
OB04A2
OR04B1
0804F.1
0804F1
OH04ZZ
997.1
932. 4
0.0
20.1
34.2
31.1
0.0
0.045
0.0
0.001
0.001
0.0
0.093
0.142
0.0
0.001
0.002
0.011
0.368
0.510
0.0
0.002
0.003
0.017
0.195
0.266
0.0
0.001
0.001
0.011
0.119
0.252
0.0
0.0
0.000
0.006
0.396
0.396
0.0
0.028
0.042
0.006
0.079
0.241
0.0
0.020
0.003
0.0
0.425 0.085
0.453 0.006
0.0 0.0
0.037 0.0
0.014 0.0
0.0 0.0
0.0
0.011
0.0
0.0
0.0
0.0
0.0
0.014
0.0
0.0
0.0
0.0
0.0
0.006
0.0
0.0
0.0
0.0
0. 147
0.196
.0.0
0.008
0.006
0.004
SUMMARY
TOTAL
SUM OF
DRAINAGE
AREA OF
LAKE =
SUB-DRAINAGE AREAS =
997.1
1017.8
TOTAL FLOW IN =
TOTAL FLO* OUT =
2
1
.55
.76
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
0804A1
0804A2
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
74
74
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.878
0.031
0.0
0.0
0.0
0.0
U.O
0.0
0.003
0.006
0.031
0.113
0.085
0.042
0.057
0.006
0.006
28
19
10
19
12
9
8
18
21
3
23
28
19
10
20
9
9
13
18
1
3
FLOW DAY
0.0
0.0
0.0
0.0
0.0
0.0
0.0
FLOW DAY
FLOW
27
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.014
0.142
0.085
0.057
0.113 21
0.0 27
0.0
0.028
0.028
-------
TRIBUTARY FLOW INFORMATION FOR COLORADO
12/07/76
LA*E CODE
MEAN
TRIBUTARY
0304H1
OSO^El
0804F1
0804ZZ
0804
MONTHLY
MONTH
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
A
5
6
7
8
9
10
11
12
1
2
3
A
5
6
7
P
9
10
11
12
1
2
3
u
5
6
7
8
C-iER
FLO*S
rEA<
7*
T*
7U
7<*
75
75
75
75
75
75
75
75
7<»
7*
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
-%: JAlLY FLOWS(CMS)
*£AN FLOW DAY
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.006
0.011
0.011
0.006
0.006
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.011
0.017
0.017
0.006
0.011
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.011
0.017
0.011
0.006
O.OC6
0.0
0.0
28
19
10
19
12
9
8
13
18
1
3
23
28
19
10
19
9
9
13
18
1
3
28
19
10
19
9
9
13
18
3
23
FLOW DAY
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.003
0.003
0.0
0.014
0.028
0.028
0.028
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
FLOW DAY
FLOW
21
27
0.0
0.0
21
27
0.003
0.0
27
0.0
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORE! RETRIEVAL DATE 76/09/84
080401
39 38 58.0 104 51 13.0 3
CHERRY CREEK LAKE
08005 COLORADO
091091
11EPALES 2111202
0010 FEET DEPTH CLASS 00
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/07 10 45 0000
10 45 0006
75/08/22 14 25 0000
14 25 0005
14 25 0018
75/10/09 10 55 0000
10 55 0005
10 55 0015
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/07 10 45 0000
75/08/22 14 25 0000
14 25 0005
14 25 0018
75/10/09 10 55 0000
10 55 0005
10 55 0015
00010
WATER
TEMP
CENT
9.7
9.7
22.9
23.1
22.6
13.9
13.5
13.1
00665
PHOS-TOT
MG/L P
0.057
0.039
0.041
0.043
0.059
0.084
0.071
00300
DO
MG/L
8.2
8.0
7.2
6.4
6.0
8.0
8.0
7.6
32217
CHLRPHYL
A
UG/L
12.8
9.8
14.2
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
33
36
24
00031
INCDT LT
REMNING
PERCENT
377
378
574
770
567
422
422
418
00400 00410 00610 00625
PH T ALK NH3-N TOT KJEL
CAC03 TOTAL N
SU
8.50
8.50
8.00
8.30
8.35
8.15
8.20
8.25
MG/L MG/L MG/L
175 0.030 0.900
175 0.020K 0.800
177 0.020K 0.700
179 0.020K 0.700
192 0.020K 0.600
192 0.020K 0.800
190 0.020K 0.800
00630 00671
N02&N03 PHOS-DIS
N-TOTAL ORTHO
MG/L MG/L P
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.009
0.005
0.007
0.007
0.005
0.008
0.005
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 76/09/24
080402
39 38 18.0 10* 51 57.0 3
CHERRY CREEK LAKE
08005 COLORADO
091091
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/07 11 05 0000
11 05 0009
75/08/22 14 00 0000
14 00 0005
75/10/09 11 15 0000
11 15 0005
11 15 0010
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/07 11 05 0000
11 05 0009
75/08/22 14 00 0000
14 00 0005
75/10/09 11 15 0000
11 15 0005
11 15 0010
00010
MATER
TEMP
CENT
10.2
9.9
24.3
23.4
13.9
13.9
13.5
00665
PHOS-TOT
MG/L P
0.056
0.055
0.122
0.053
0.056
0.055
11EPALES 2111202
0013 FEET DEPTH CLASS 00
00300 00077 00094 00400 00410 00610 00625
00 TRANSP CNDUCTVY PH T ALK NH3-N TOT KJEL
SECCHI FIELD CAC03 TOTAL N
MG/L INCHES MICROMHO SU MG/L MG/L MG/L
8.2 37
7.6
7.6 26
5.0
8.0 24
7.6
7.4
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
13.2
124.6
9.8
380
378 8.50
607 8.50
564 8.50
425 8.20
425 8.25
422 8.25
1
•
175 0.040 0.800
172 0.020K 0.700
172 0.020 1.600
187 0.020K 0.800
188 0.020K 0.600
187 0.020K 0.700
00630 00671
N02&.N03 PHOS-UIS
N-TOTAL ORTHO
MG/L MG/L P
0.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.009
0.025
0.014
0.006
0.006
0.007
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 76/09/24
080403
39 3a 12.0 104 50 55.0 3
CHERRY CREEK LAKE
08005 COLORADO
091091
HEP ALES
2111202
0019 FEET DEPTH CLASS
DATE
FROM
TO
75/05/07
75/08/22
75/10/09
DATE
FROM
TO
75/05/07
75/08/22
75/10/09
TIME DEPTH
OF
DAY FEET
11 30 0000
11 30 0005
11 30 0015
14 30 0000
14 30 0005
14 30 0014
10 40 0000
10 40 0005
10 40 0010
TIME DEPTH
OF
DAY FEET
11 30 0000
11 30 0005
11 30 0015
14 30 0000
14 30 0005
14 30 0014
10 40 0000
10 40 0005
10 40 0010
00010
WATER
TEMP
CENT
10.3
10.2
10.0
23.4
23.5
22.6
13.7
13.6
13.4
00665
PHOS-TOT
MG/L P
0.051
C.070
0.065
0.044
0.048
0.043
0.025
0.050
0.047
00300
DO
MG/L
8.0
8.0
8.0
7.2
7.2
5.8
7.6
7.4
7.6
32217
CHLRPHYL
A
UG/L
2.3
11.6
11.6
00077
TRANSP
SECCHI
INCHES
36
24
36
00031
INCDT LT
REMNING
PERCENT
00094
CNDUCTVY
FIELD
MICROMHO
382
381
382
579
570
565
426
421
418
00400
PH
SU
8.70
8.50
8.50
8.50
8.50
8.40
8.10
8.25
8.30:
*
00410
T ALK
CAC03
MG/L
176
176
176
177
177
177
60
193
193
00610
NH3-N
TOTAL
MG/L
0.030
0.040
0.030
0.020K
0.030
0.020K
0.020K
0.020K
0.020K
00
00625
TOT KJEL
N
MG/L
0.800
0.800
0.900
0.800
0.700
0.700
0.200K
0.700
0.700
00630
N02&M03
N-TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.060
0.020K
0.020K
00671
PHOS-DIS
ORTHO
MG/L P
0.009
0.010
0.011
0.006
0.007
0.006
0.002K
0.006
0.005
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 76/09/24
0804A1
39 3* 11.0 104 51 20.0 4
CHERPY CREEK
08 7.b FlTZSlMOriS
0/CHERRV CREEK LAKE 091091
1225 BRDG .9 MI S* OF PARKER RO UNDERPAS
11EPALES 2111204
0000 FEET DEPTH CLASS 00
DATE
FROM OF
TO DA*
TIME DEPTH
FEET
75/05/18 08 30
75/06/01 10 05
75/06/21 11 45
75/07/03 16 25
75/07/27 09 15
75/08/23 08 45
00630
N02&N03
N-TOTAL
MG/L
0.020
0.575
0.145
0.180
0.550
0.270
00625
TOT KJEL
N
MG/L
1.200
1.350
1.000
1.050
0.450
2.100
00610
NH3-N
TOTAL
MG/L
0.020
0.040
0.075
0.080
0.195
0.040
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.035
0.110
0.085
0.230
0.025
00665
PHOS-TOT
MG/L P
0.110
0.110
0.180
0.140
0.325
0.100
-------
STORET RETRIEVAL DATE 76/09/24
0804A2
39 36 27.0 104 49 20.0 4
CHERRY CREEK
08 7.5 PARKER
T/CHERKY CREEK LAKE 091091
8NK 100 FT E OF SEC RO 1.6 M N RT 88 JCT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
00630
DATE TIME DEPTH N02&N03
FROM OF N-TOTAL
TO DAY FEET MG/L
75/02/09 09 00
75/OJ/09 08 30
75/04/13 09 00
75/05/18 09 45
75/06/01 10 38
75/06/21 12 20
2.100
1.500
1.880
0.090
1.150
0.870
00625
TOT KJEL
N
MG/L
1.900
3.600
2.800
0.700
4.500
0.600
00610
NH3-N
TOTAL
MG/L
0.032
0.040
0.035
0.020
0.025
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.240
0.264
0.240
0.085
0.260
0.180
00665
PHOS-TOT
MG/L P
0.250
1.700
0.520
0.150
1.900
0.210
-------
STORET RETRIEVAL DATE 76/09/24
OATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/09/28
74/11/10
74/12/19
75/01/12
75/02/09
75/03/08
75/04/13
75/05/18
75/06/01
75/06/21
75/07/03
75/08/23
14 00
13 30
14 40
09 30
08 30
15 00
08 30
09 00
11 00
12 40
17 20
09 30
080431
39 39 15.0 104 49 55.0 4
SPLWf TO * TOLL GAGE CR
08 7.5 FITZSIMONS
0/CHEWRY CREEK LAKE 091091
SPILL-JAY AT ST RT 83 BHOG
11EPALES 211120*
0000 FEET DEPTH CLASS 00
10630
'&N03
OTAL
IG/L
0.012
0.232
1.960
0.740
0.880
2.200
0.620
0.055
0.055
0.015
0.015
0.005
00625
TOT KJEL
N
MG/L
1.100
0.700
1.300
1.500
1.300
1.700
2.900
1.000
1.200
1.100
1.950
0.165
00610
NH3-N
TOTAL
MG/L
0.020
0.030
0.200
0.464
0.464
0.136
0.070
0.115
0.075
0.060
0.100
0.030
00671
PHOS-D1S
ORTHO
MG/L P
0.010
0.005K
0.008K
0.008K
0.008K
0.008K
0.010
0.010
0.005
0.015
0.045
0.025
00665
PHOS-TOT
MG/L P
0.020
0.010K
0.010
0.070
0.010
0.030
0.010
0.030
0.030
0.050
0.090
0.170
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/09/34
39 36 20.0 104 50 50.0 4
COTTONWOOD CREEK
08 7.5 PARKER
T/CHEHRY CREEK CAKE
091091
PEORIA ST BXDG .7 MI N OF RT 88 JCT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
DATE TIME DEPTH
FROM OF
TO DAY FEET
74/11/10 15 00
74/12/19 15 40
75/03/09 09 00
75/04/13 10 00
75/05/18 10 00
75/06/01 10 21
75/06/21 12 05
00630
N02&N03
N-TOTAL
MG/L
0.024
0.064
0.015
0.005
0.015
0.015
0.005
00625
TOT KJEL
N
MG/L
1.000
0.600
0.500
0.450
0.450
0.950
0.500
00610
NH3-N
TOTAL
MG/L
0.025
0.032
0.032
0.025
0.025
0.035
0.027
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.048
0.008K
0.010
0.015
0.015
0.015
00665
PHOS-TOT
MG/L P
0.030
0.070
0.040
0.010
0.060
0.040
0.060
K VALUE KNOWN TO BE
LESS THAN INDICATED
------- |