U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
SAIW1ISH LAKE
KING COUNTY
WASHINGTON
EPA REGION X
WORKING PAPER No, 874
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
SAFIW1ISH LAKE
KING COUNTY
WASHINGTON
EPA REGION X
WORKING PAPER No, 874
WITH THE COOPERATION OF THE
WASHINGTON DEPARTMENT OF ECOLOGY
AND THE
WASHINGTON NATIONAL GUARD
JULY, 1977
-------
REPORT ON SAMMAMISH LAKE
KING COUNTY, WASHINGTON
EPA REGION X
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. 874
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
July 1977
-------
CONTENTS
Page
Foreword i i
List of Washington Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 12
V. Literature Reviewed 17
VI. Appendices 18
-------
ii
FOREWORD
The National Eutrophicatlon Survey was Initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, and impact on selected freshwater lakes as a basis for
formulating comprehensive and coordinated national, regional, and
state management practices relating to point source discharge
reduction and nonpoint source pollution abatement in lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts
that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be
constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized
model can be transformed into an operational
representation of a lake, its drainage basin, and
related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and
watershed data collected from the study lake and its drainage
basin 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(cj], 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.
-------
m
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 Washington Department of
Ecology for professional involvement, to the Washington National
Guard for conducting the tributary sampling phase of the Survey,
and to those Washington wastewater treatment plant operators who
provided effluent samples and flow data.
Ms. Barbara Blau, Lake Restoration Program, and the staff
of the Washington Department of Ecology, Lake Restoration Program,
provided invaluable lake documentation and counsel during the
Survey, reviewed the preliminary reports and provided critiques
most useful in the preparation of this Working Paper Series.
Major General Howard S. McGee, Adjutant General of Washington,
and Project Officer Colonel Clinton C. Johnson, who directed the
volunteer efforts of the Washington National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
-------
IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF WASHINGTON
LAKE NAME
American Lake
Banks Lake
Chelan Lake
Diamond Lake
Green Lake
Keechelus Lake
Mayfield Lake
Medical Lake
Moses Lake
Ozette Lake
Sammamish Lake
Lake Whatcom
Lower Granite Reservoir
COUNTY
Pierce
Grant, Douglas
Chelan
Pend Oreille
King
Kittitas
Lewis
Spokane
Grant
Clallam
King
Whatcom
Garfield, Whatcom
-------
122°10'
122°00'
47°40'-
SAMMAMISH LAKE
Tributary Sampling Site
X Lake Sampling Site
s 10 Km.
SAMMAMISH
LAKE
121°50'
-------
REPORT ON SAMMAMISH LAKE, WASHINGTON
STORET NO. 5311
I. CONCLUSIONS
A. Trophic Condition:*
Based upon Survey data Sammamish Lake is considered meso-
trophic with a tendency towards eutrophy during the spring.
Chlorophyll a_ values ranged from 2.8 yg/1 in October to 22.4
yg/1 in March, with a mean of 7.3 yg/1. Secchi disc visibility
was high throughout the sampling year. Potential for primary
production as measured by algal assay control yield was high
during spring and low during fall sampling. Of the 13
Washington lakes sampled in 1975, 6 had higher median total
phosphorus levels (0.015 mg/1), 2 had higher median inorganic
nitrogen values (0.210 mg/1) and 10 had higher median ortho-
phosphorus levels (0.006 mg/1) than Sammamish Lake.
Survey limnologists did not report any problem algal
blooms or macrophyte growths during the sampling year.
*See Appendix E.
-------
B. Rate-Limiting Nutrient:
The algal assay results indicate phosphorus limitation in
Sammamish Lake during spring and fall sampling dates (03/31/75;
10/28/75). The lake data substantiate primary limitation by
phosphorus all three seasonal visits to the lake.
C. Nutrient Controllability:
1. Point sources -
There were no known municipal or industrial point sources
contributing to the phosphorus load of Sammamish Lake during
the 1975 sampling year. The town of Issaquah formerly dis-
charged treated municipal and milk plant wastes to the lake;
but as of 1968, the wastes were diverted to the Seattle-Benton
plant which discharges outside the Sammamish Lake watershed.
Ketelle and Uttormark (1971) report that this diversion accom-
plished an estimated 50% reduction in phosphorus entering the
lake. Septic tanks were estimated to contribute 1.2% of the
total phosphorus load to the ]ake in 1975.
o
The annual phosphorus loading of 0.31 g P/m /yr is equal
to Vollenweider's (1975) proposed "oligotrophic" level for a
lake with such volume and retention time. Every effort should
be made to control future phosphorus sources impacting the lake
in order to maintain the existing water quality.
-------
2. Nonpoint sources -
During the sampling year, Issaquah Creek contributed
75.6% of the total phosphorus load to Sammamish Lake, Tib-
betts Creek contributed 2.4%, and ungaged drainage areas
were estimated to have contributed 14.6% of the total.
The phosphorus export rate of Issaquah Creek was sub-
stantially greater during the sampling year than would be
expected from nonpoint contributions alone (Section IV-D).
This inflation is probably a result of either septic tank
contributions or urban runoff from the city of Issaquah
through which Issaquah Creek flows.
-------
I'l. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by Emery, et al. (1973). Tribu-
tary flow data were provided by the Washington District Office of
the U.S. Geological Survey (USGS). Outlet drainage area includes
the lake surface area. Mean hydraulic retention time was obtained
by dividing the lake volume by mean flow of the outlet. Precipi-
tation values are estimated by methods as outlined in National
Eutrophication Survey (NES) Working Paper No. 175. A table of
metric/English conversions is included as Appendix A.
A. Lake Morphometry:
1. Surface area: 19.82 km2.
2. Mean depth: 17.7 meters.
3. Max-i mum-depth: 31.0 meters.
4. Volume: 350.814 x 10^ m3.
5. Mean hydraulic retention time: 637 days (1.8 years).
-------
B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km?) (m
D-l Issaquah Creek 141.7 4.14
E-l Tibbetts Creek 13.0 0.25
Minor tributaries and
immediate drainage - 81 .5 2.02
Totals 236.2 6.41
2. Outlet - A-l Sammamish River 253.0 6.37
C. Precipitation:
1. Year of sampling: 109.6 cm.
2. Mean annual: 90.6 cm.
-------
III. LAKE WATER QUALITY SUMMARY
Sammamish 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 col-
lected from four stations on the lake (Stations 03 and 04 were not
sampled in March) and from a number of depths at each station
(see map, page v). During each visit, depth-integrated samples
were collected from each station for chlorophyll a_ analysis and
phytoplankton identification and enumeration. During the first
and last visits, 18.9-liter depth-integrated samples were com-
posited for algal assays. Maximum depths sampled were 26.8 meters
at Station 01, 24.4 meters at Station 02, 20.7 meters at Station 03,
and 12.5 meters at Station 04. For a more detailed explanation
of NES methods, see NES Working Paper No. 175.
The results obtained are presented in full in Appendix C and
are summarized in III-A for waters at the surface and at the
maximum depth for each site. Results of the phytoplankton counts
and chlorophyll ^determinations are included in III-B. Results
of the limiting nutrient study are presented in III-C.
-------
STOPET CODE 5311
PHYSICAL AND CHEMICAL CHARACTERISTICS
TEMPERATU=E (DEG CENT)
O.-l.S M riEPTH
MAX DEPTH**
DISSOLVED OXYGEN (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
CONDUCTIVITY (UMHOS)
0.-1.5 M DEPTH
MAX DEPTH**
PH (STANDARD UMITS)
O.-l.S M PEPTH
MAX DEPTH**
TOTAL ALKALINITY (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
DISSOLVED ORTHO P
0.-1.5 M DEPTH
MAX DEPTH**
N02*N03 (MG/L)
0.-1.5 M HE^TH
MAX DEPTH**
AMMONIA (MG/L)
0.-1.5 M DEPTH
MAX DEPTH**
KJELDAHL N (Mf,/L>
O.-l.S M DEPTH
MAX DEPTH**
SECCHI DISC (METERS)
( 3/31/75
ENT)
4
2
MG/L)
4
2
S)
4
2
)
2
MG/L)
2
4
2
(MG/L)
4
2
4
4
4
2
6.9-
13.0-
12.4-
86.-
87.-
8.5-
7.9-
22.-
28.-
n. 021-0
0.025-0
0.006-0
0.004-0
0.370-0
0.3«0-0
0.020-0
0.020-0
0.400-0
0.500-0
6.3
7.S
1 3.6
13.2
ct8.
B8.
H.ft
8.5
39.
41.
.025
.090
.014
.017
.400
.390
.030
.030
.600
.500
7.6
13.3
12.6
86.
87.
3.7
8.2
31.
0.057
0.011
0.010
0.3PO
0.0?5
0.025
0.500
0.5(10
)
'••AX
OEPTH
(METERS) N*
0.0-
16.8-
0.0-
16.6-
0.0-
16.8-
o.O-
16.8-
0.0-
16.8-
0.0-
16.8-
0.0-
16.8-
n.O-
16.0-
0.0-
16.P-
0.0-
16.8-
1.5
24.4
1.5
24.4
1.5
24.4
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
4
8
4
8
4
8
4
8
4
H
4
8
4
4
8
4
8
4
< 7/17/75
S*»* = 4
^ANGE MEDIAN
19.2- 19.6
6.6- 9.5
6.6- 11.0
0.4- 9.4
84.- 90.
59.- 64.
8.9- 9.1
6.9- 7.6
35.- 40.
33.- 38.
0.010-0.017
0.012-0.024
0.005-0.017
0.005-0.019
0.120-0.290
0.2RO-0.390
0.020-0.040
0.020-0.030
0.300-0.500
0.300-0.400
19.4
6.8
10.5
2.1
89.
59.
8.9
7.1
39.
36.
0.012
0.017
0.006
0.013
0.145
0.320
0.030
0.025
0.350
0.350
)
MAX
DEPTH
RANGE
(METERS) N«
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
0.0-
12.5-
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
1.5
26.8
8
4
R
4
8
4
8
4
a
4
8
4
8
4
8
4
8
4
8
4
< 10/28/75
RANGE MEDIAN
13.1- 13.5
9.2- 13.5
8.8- 9.8
2.0- 9.6
77.- 89.
72.- B8.
7.2- fl.O
6.7- 7.9
42.- 53.
45.- 55.
0.013-0.018
0.015-0.056
0.002-0.005
0.003-0.013
0.070-0.150
0. 060-0. ?00
0.020-0.020
0.020-0.040
0.200-0.200
0.200-0.200
13.3
10.5
9.3
7.9
80.
76.
7.5
7.1
48.
52.
0.014
0.033
0.003
0.005
0.105
0.155
0.020
0.025
0.200
0.200
)
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
0.0- 1.5
12.5- 22.9
2.1- 2.6
?.9- 3.7
3.4
3.0- 3.7 3.7
« N = NO. OF SAMPLES
*» MAXIMUM OE^TH SAMPLED AT EACH SITE
5 = NO. OF SITES SAMPLED ON THIS DATE
-------
8
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
03/31/75
07/17/75
10/28/75
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Melosira
Fragilaria
Stephanodiscus
Asterionella
Synedra
Other genera
Total
Aphanocapsa
Aphanothece
Chroomonas
Botcypcoccus
Chlorophytan colony
Other genera
Total
Aphanocaj)sa
Fragilaria
Chroomonas
Cryptomonas
Aphanizomenon
Other genera
Total
Algal
Units
per ml
5,024
1,136
723
551
344
344
8,122
1,081
765
90
45
45
135
2,161
683
683
528
186
31
63
2,174
-------
2. Chlorophyll a_ -
Sampling Station Chlorophyll a_
Date Number (yg/1)
03/31/75 01 22.4
02 20.9
03
04
07/17/75 01 3.1
02 4.6
03 4.6
04 4.7
10/28/75 01 4.5
02 2.8
03 3.1
04 3.4
-------
10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
a. 03/31/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
b. 10/28/75
Ortho P
Cone, (mg/1)
0.008
0.058
0.058
0.008
Ortho P
Spike (mg/1) Cone.
Control
0.05 P
0.05 P + 1.0 N
1.00 N
0.005
0.055
0.055
0.005
Inorganic N
Cone, (mg/1)
0.368
0.368
1.368
1.368
Inorganic N
Cone, (mg/1)
0.130
0.130
1.130
1.130
Maximum Yield
(mg/1-dry wt.)
1.6
11.7
26.7
0.8
Maximum Yield
(mg/1-dry wt.)
0.5
5.6
29.6
0.4
-------
11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum, indicate that the potential for primary productivity as
measured by algal assay control yield was high in Sammamish Lake
during spring sampling (03/31/75) and moderate during fall (10/28/75).
The addition of phosphorus to the assay samples resulted in a sig-
nificant increase in yield over that of the control, indicating phos-
phorus limitation in both seasonal samples. No growth response
accompanied the addition of nitrogen alone.
The mean inorganic nitrogen to orthophosphorus ratios (N/P) in
the lake data were approximately 45/1, 25/1, and 32/1 in the spring.
summer and fall, respectively, also indicating phosphorus limitation
in Sammamish Lake.
-------
12
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Washington
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 February when two samples were col-
lected. Sampling was begun 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 pro-
vided by the Washington District Office of the USGS for the tribu,-
tary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a USGS computer program for
calculating stream loadings. Nutrient loads indicated for tribu-
taries are those measured minus known point source loads, if any.
Nutrient loadings for unsampled "minor tributaries and imme-
diate drainage" ("II" of USGS) were estimated by using the mean
2
annual nutrient loads, in kg/km /yr, in Tibbetts Creek at Station
2
E-l and multiplying the means by the II area in km .
-------
13
A. Waste Sources :
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
D-l Issaquah Creek 4,635 75.6
E-l Tibbetts Creek 145 2.4
b. Minor tributaries and immediate
drainage (nonpoint load) - 895 14.6
c. Known municipal STP's - None
d. Septic tanks* - 110 1.8
e. Known industrial - None
f. Direct precipitation** - 345 5.6
Totals 6,130 100.0
2. Output - A-l Sammamish River 4,450
3. Net annual P accumulation - 1,680
*Estimate based on 381 lakeshore residences, 1 park and 1 camp.
**Estimated (See NES Working Paper No. 175).
-------
14
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
D-l Issaquah Creek 178,435 52.5
E-l Tibbetts Creek 18,735 5.5
b. Minor tributaries and immediate
drainage (nonpoint load) - 117,440 34.5
c. Known municipal STP's - None
d. Septic tanks* - 4,165 1.2
e. Known industrial - None
f. Direct precipitation** - 21,400 6.3
Totals 340,175 100.0
2. Output - A-l Sammamish River 129,275
3. Net annual N accumulation - 210,900
*Estimate based on 381 lakeshore residences, 1 park and 1 camp.
**Estimated (See NES Working Paper No. 175).
-------
15
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary kg P/km/yr kg N/km /yr
Issaquah Creek 32 1,259
Tibbetts Creek 11 1,441
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
B-l Unnamed Creek 0.025 1.688
C-l Unnamed Canal 0.065 0.735
-------
16
E. Yearly Loadings:
In the following table, the existing phosphorus annual
loading is compared to the relationship proposed by Vollenweider
(1975). Essentially, his "eutrophic" loading is that at which
the receiving waters would become eutrophic or remain eutrophic;
his "oligotrophic" loading is that which would result in the
receiving water remaining oligotrophic or becoming oligotrophic
if morphometry permitted. A "mesotrophic" loading would be
considered one between "eutrophic" and "oligotrophic".
Note that Vollenweider's model may not apply to lakes with
short hydraulic retention times or in which light penetration is
severely restricted by high concentrations of suspended solids
in the surface waters.
Total Yearly
Phosphorus Loading
Estimated loading for Sammamish Lake 0.31
Vollenweider's "eutrophic" loading 0.62
Vollenweider's "oligotrophic" loading 0.31
-------
17
V. LITERATURE REVIEWED
Emery, R.M., C.E. Moon, and E.B. Welch. 1973. Delayed Recovery
of a Mesotrophic Lake after Nutrient Diversion. Journal W.P.C.F.
45(5) : 913-925.
Ketelle, M.J. and P.O. Uttormark. 1971. Problem Lakes in the
United States. U.S. Environmental Protection Agency #16010 EHR,
University of Wisconsin, Madison, Wisconsin.
U.S. Environmental Protection Agency. 1975. National Eutrophica-
tion Survey Methods 1973-1976. Working Paper No. 175. National
Environmental Research Center, Las Vegas, Nevada, and Pacific
Northwest Environmental Research Laboratory, Corvallis, Oregon.
Vollenweider, R.A. 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydrol. 37: 53-84.
-------
18
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
-4
Cubic meters x 8.107 x 10 - acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOP WASHINGTON
11/16/76
LAKE CODE 5311
SAMMAMISH LAKE
TOTAL ORAINAGF. APE* OF LAKE
SUB-DRAINAGE
TRIBUTARY AREA(SQ KM)
JAM
FFB
253.0
MAR
APR
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SFP
OCT
NOV
DEC
MEAN
5311A1
531101
5300E1
53m?
253.0
141.7
13.0
101.3
15.46
10.08
0.25
4.79
11.55
7.08
0.25
3.62
9.77
5.95
0.25
3.06
7.28
4.62
0.25
1.90
4.39
2.70
0.?5
1.2?
3.31
2.44
0.25
0.45
2.07
1.40
0.25
0.34
1.39
1.01
0.25
0.34
l.flS
1.33
0.?5
0.76
2.46 *.13
1.65 3.«2
0.?5 0.25
1.19 ?.01
11.98
7.76
0.25
4.59
A. 37
4.14
0.?5
2.0?
SUMMARY
TOTAL
SUM OF
DRAINAGE
AREA OF
LAKE =
SUB-DRAINAGE AREAS =
25?. 0
255.9
TOTAL FLOW
TOTAL FLOW
IN =
OUT =
77.15
76.66
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR "EAN FLOW DAY
5311A1
531101
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
g
74
74
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
FLOW DAY
FLOW DAY
FLOW
1.756
1.557
4.389
9.345
18.123
12.743
12.176
7.787
6.286
2.832
2.350
1.699
0.779
0.799
2.673
5.975
11.468
8.212
6.513
4.276
2.945
1.543
1.116
1.407
29
19
17
15
11
8
?
1?
17
8
16
29
19
17
15
1 1
8
•a
1?
17
fl
If.
1.586
1.388
2.832
7.362
15.008
8.070
17.698
7.362
5.663
3.087
1.246
0.759
0.759
0.920
4.899
5.635
3.143
13.592
2.973
2.492
1.444
0.906
23
18.689
23
9.288
-------
TRIBUTARY FLOW INFORMATION FOP WASHINGTON
11/16/76
LAKE CODE 5311
SftMMAMISH LAKE
MEAN MONTHLY FLO^S AND OAILY
TRIBUTARY
5311E1
5311ZZ
MONTH
YEAR
9
10
11
12
1
2
3
4
5
6
7
e
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
MEAN FLOW DAY
0.007
0.008
0.093
0.207
0.668
0.541
0.345
0.255
0.175
0.072
0.014
0.0?2
0.850
1.133
2.832
4.248
5.663
4.814
4.P48
3.398
2.265
0.991
0.8SO
0.850
?9
19
17
IS
11
p
2
1?
17
8
16
FLO* DAY
0.005
0.006
0.030
0.383
0.170
0.1S3
0.906
0.193
0.144
0.079
FLOW DAY
FLOW
?3
0.623
0.008
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STflPET RETRIEVAL 04TE 76/11/16
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
DATE
FOOM
TO
75/0.1/31
75/07/17
75/10/28
TIME
OF
DAY
15 20
15 20
15 20
15 20
15 20
14 40
14 40
14 40
14 40
14 40
14 40
14 40
11 50
11 50
11 50
11 50
DEPTH
FEET
0000
0005
0015
0030
0055
0000
0005
0015
0023
0035
0060
008P
0000
0005
0020
005R
00010
WATER
TEMP
CENT
8.3
7.6
7.8
7.6
7.5
19.6
19.5
19.1
14.6
10.3
7.0
6.6
13.5
13.5
13.5
11.4
531101
47 38 00.0 12? 04 40.0 3
SAMMAMISH LAKE
53033 WASHINGTON
11EPALES 2111202
0059 FEET DEPTH CLASS 00
00300
00
MG/L
13.6
13.4
13.3
13.0
13.2
10.4
10.4
10. P
11.4
9.4
5.8
0.4
9.4
9.6
9.4
9.0
00077
TRANSP
SECCNl
INCHES
34
132
144
00094
CNDUCTVY
FIELD
MICR.OMHO
86
88
89
87
87
84
89
89
79
69
63
59
89
77
74
72
00400
PH
SU
8.85
8i70
8.50
8.55
B. 50
8.90
8.90
9.10
9.00
7.80
7.20
6.90
7.50
7.50
7.45
7.00
00410
T ALK
CAC03
MG/L
22
24
25
34
41
36
40
40
38
3*>
36
34
45
47
47
50
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.030
0.020
0.030
0.0?OK
0.040
0.0?0
0.020
0.030
0.020K
0.020
0.020K
0.020K
0.020K
0.030
00*25
TOT KJEL
N
MG/L
0.600
0.500
0.500
0.500
0.500
0.300
0.400
0.300
0.400
0.300
0.300
0.300
0.200K
O.POOK
0.200K
0.200
006^0
N02S.N03
N-TOTAL
MG/L
0.170
0.38"
0.380
0.350
0.380
0.140
0.130
0.120
0.200
0.320
0.400
0.300
0.080
0.090
0.090
0.170
00671
PHOS-DIS
OP.THO
MG/L P
0.006
o.mu
0.013J
0.003
0.017J
0.013K
0.009
0.014K
0.015K
0.011
0.014K
0.019
0.002K
0.003
0.005
0.013
DATE
FRO"
TO
75/03/31
75/07/17
75/10/28
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL IMCOT LT
OF A PAWNING
DAY FEET
15
15
15
15
IS
14
14
14
14
14
14
14
11
11
11
11
20
20
20
20
20
40
40
40
40
40
40
40
50
50
50
50
0000
0005
0015
0030
005*
0000
0005
0015
0023
0035
0060
OOflfl
0000
0005
0020
005«
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.022
.024
.019
.021
.025
.01]
.015
.013
.013
.014
.nil
.024
.014
.014
.015
.056
UG/L PERCENT
22.4
3.1
4.5
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
STORE! RETRIEVAL OATt T~/\
NATL FUT«0?nICATIOM SUSv/EY
Fpfl-|_AS VEGAS
531102
47 35 22.0 12? 05 58.0 3
SAMMAMISH LAKE
53033 WASHINGTON
DATF
TO
75/03/31
75/07/17
75/10/2R
00010
TI«E OEPTM WATER
OF TE1P
r>AY FEET
14
14
14
14
14
14
15
15
15
15
15
15
12
12
12
12
12
10
10
10
10
10
10
IS
15
15
15
15
15
10
10
10
in
10
0000
0005
0020
0040
0060
0080
0001
0005
0015
0030
0050
0070
0000
000=.
0018
0055
0075
CENT
7.
7.
7.
7.
7.
ft.
19.
19.
19.
13.
7.
6.
13.
13.
13.
13.
9.
6
7
7
7
3
9
5
3
1
3
q
7
1
1
1
4
f.
00300
DO
MG/L
13
13
13
12
12
12
10
10
10
10
8
?
9
9
7
3
6
.2
.0
.0
.6
.6
.4
.6
.8
.6
.8
.2
.4
.0
.2
.8
.8
.8
00300 00077 00094
DO TRANS" CNDUCTVY
CECCHI FIELD
MG/L INCHES MICROMHO
13.2 102
13.0
13.0
12.6
12.6
12.4
10.6 144
10.8
10.6
10.8
8.2
2.4
9.0 144
9.2
7.8
3.8
6.8
87
86
86
87
88
88
89
89
89
77
65
59
80
79
78
78
79
11EPALES 2111202
0081 FEET DE^TH CLASS 00
00400 00410 00610 00625 00630 00671
PH T ALK NH3-N TOT KJEL M02^N03 PHOS-OIS
CAC03 TOTAL M N-TOTAL ORTHO
StJ
8.80
8.50
8.40
8.25
8.00
7.90
9.00
9.10
9.10
8.85
7.40
7.00
7.60
7.60
7.30
7.00
7.25
MG/L
39
38
30
31
29
28
39
3«
40
38
37
37
49
48
58
55
55
MG/L
0.030
0.020
0.020K
0.020
0.020
0.020
0.030
0.030
0.020
0.030
0.030
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
MG/L
0.500
0.400
0.400
0.400
0.400
0.500
0.400
0.300
0.300
0.400
0.300
0.300
0.200K
0.200K
0.200K
0.200K
0.200K
MG/I
0.400
0.400
0.380
0.400
0.410
0.390
0.290
0.150
0.120
0.240
0.390
0.340
0.120
0.120
0.180
0.330
0.140
««G/L P
0.014J
0.012J
0.003
0.003
0.004
0.004
0.005
0.005
0.011
0.012
0.012
0.017
0.005
0.004
0.009
0.007
0.003
DATE
FOO"
TO
75/03/31
75/07/17
75/10/28
00665 32217 00031
TIME DEPTH pnoS-TOT CHLRPHYL INCOT LT
OF A BFMNING
DAY FEET
14
14
14
14
14
14
15
15
15
15
15
15
12
12
12
12
12
10
10
to
10
1 1
n
15
15
15
15
15
15
10
10
10
10
10
0000
0005
002"
0040
0060
OOHO
0000
0005
0015
0030
0050
0070
0000
000^
0018
0055
007S
MG/L P UG/L PERCENT
0,
0.
0.
0.
0.
0.
0.
0,
0.
0,
0,
0.
0.
0.
0.
0,
0.
,025 20.9
.021
.039
.029
,035
,090
.013 3.4
.011
.013
,012
.012
.018
,017 ?.a
.015
.019
,022
.015
K VALUE KNOWN TO BE LESS
THAN INDICATED
J VALUE KNOWN TO BE ESTIMATED
-------
ST09ET RETRIEVAL DATE 76/11/1')
"•'ATI. FUT=OPhICATION
EPA-LAS VEGAS
531103
47 33 32.0 1?2 0* 18.0
SAMMAMISH LAKE
53033 WASHINGTON
11EPALES 760109 2111202
0071 FEET DEPTH CLASS 00
DATE
F~rv>i
TO
75/07/17
75/1 0/2P.
TI*E DEPTH
OF
DAY FEET
14 in 0000
14 10 0005
14 10 0023
14 10 0040
14 10 0067
12 35 0001
12 35 000=-
12 35 0016
12 35 0045
12 35 006«
00010
WATER
TEMP
CENT
19.5
19.4
14.2
8.8
6.9
13.1
13.1
13.1
10.1
9.2
00300
DO
MG/L
10.4
6.6
14.6
ft. 4
1.8
8.8
8.8
8.2
1.6
2.0
00077
TRANSP
<;ECCHI
INCHES
114
120
00094
CNOUCTVY
FIELD
MICROMHO
87
87
77
64
59
80
79
79
72
72
00400
PH
su
8.90
8.90
8.50
7.10
7.20
7.20
7.20
7.15
6.80
6.70
00410
T ALK
CAC03
MG/L
35
37
35
33
33
53
51
50
53
53
00610
NH3-N
TOTAL
MG/L
0.030
0.0?0
0.030
0.080
0.030
0.020K
0.020K
0.0?OK
0.020K
0.040
00625
TOT KJEL
*J
MG/L
0.500
0.400
0.400
0.300
0.400
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02&N03
N-TOTAL
MG/L
0.1 ?0
0.160
O.?20
0.320
0.390
0.140
0.150
0.150
0.310
O.?00
00671
PHOS-OIS
ORTHO
MG/L P
0.007
0.006
0.005
0.006
0.010
0.003
0.004
0.005
0.009
0.007
DATE TIME DEPTH
FROM OF
TO HAY FEET
75/07/17 14 10 0000
14 10 0005
14 10 0023
14 10 0040
14 10 00ft7
75/10/28 12 35 0000
12 35 "005
12 35 001*
12 35 0045
12 35 006°
0665
S-TOT
YL P
0.017
0.015
0.01B
0.034
0.016
0.016
0.01S
0.017
0.031
0.041
32217
CHI.RPHYL
A
UG/L
4.6
3.1
00031
TNCDT LT
PFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 7^/11/16
ivATL FUTSOPblCATIQK, SURVEY
EPA-LAS VEGAS
531104
47 3« 52.0 122 05 44.0 3
SAMMAMISH LAKE
53033 WASHINGTON
DATE TI^E DEPTH
FPO" OF
TO DAY FEET
75/07/17 15 40 OOOn
15 40 0005
15 40 0015
15 40 0034
15 40 0041
75/10/20 11 25 0000
11 ?5 000^
11 25 0022
11 25 0041
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/07/17 15 40 0000
15 40 0005
15 40 001=1
15 40 0034
15 40 0041
75/10/39 11 ?5 0000
11 25 0005
11 25 002?
11 25 0041
00010 00300 00077 00094
*ATER oo TRANSP CNDUCTVY
TEMP «;ECCHI FIELD
CENT MG/L TNCHE5 MICPOMHO
19.3
19.?
18.9
16.1
9.5
13.5
13.5
13.6
13.5
11.0
10.8
13.2
12.2
9.4
9.8
9.6
9.4
9.6
132
144
90
90
90
92
64
82
80
76
88
0665
S-TOT
/L P
0.010
0.010
0.011
0.011
0.012
n.013
0.013
0.013
0.025
32217
CHLRPHYL
A
UG/L
4.7
3.4
00031
INCOT LT
PFMNING
PERCENT
11EPALES
2111202
0046 FEET DEPTH CLASS
00400
PH
SU
9.00
9.05
9.10
9.20
7.60
8.00
7.80
7.70
7.90
00410
T ALK
CAC03
MG/L
39
40
40
40
39
42
4?
44
45
00610
NH3-N
TOTAL
MG/L
0.020
0.030
0.0?0
0.030
0.030
0.020K
0.020K
0.0?OK
0.020K
00
00625
TOT KJEL
N
MG/L
0.300
0.300
0.100
0.400
0.400
0.200K
0.200K
O.HOOK
0.200
00630
N02J.N03
N-TOTAL
MG/L
0.140
0.150
0.120
0.150
O.PSO
0.070
0.070
0.070
0.060
00671
PHOS-DIS
OPTHO
MR/L P
0.017K
o.oos
0.011
0.013K
0.005
0.003
0.002
0.002
0.003
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STOPET SETPIEVAL DATE
NATL EUTROPHICATIOM SURVEY
EPA- LAS VEGAS
5311A1
47 39 15.0 12? 06 05.0 4
SAMMAMISH OIVEf-
53 7.5 REDMOND
0/SAMMAMISH LAKE 131191
BANK SMPL .1 MI UPSTRM LAKE HILL SEW DIS
11EPALES JM11204
0000 FEET DEPTH CLASS 00
DATE
F»OM
TO
74/09/29
74/10/1"
74/11/17
74/12/15
75/01/11
75/02/08
75/02/23
75/03/02
75/04/12
75/05/17
75/06/08
75/08/16
00630 00625
TIME DEPTH NO?f>NQ3 TOT KJEL
Of N-TOT&L N
DAY FEET
12
11
10
10
10
12
in
10
10
10
30
30
15
30
30
40
30
30
30
15
MG/L
0.012
0.036
0.040
0.176
0.264
0.250
0.35?
0.352
0.360
0.270
0.200
0.020
MG/L
0.450
0.300
0.300
0.400
0.500
0.300
0.600
0.400
0.500
0.150
0.150
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.010
0.020
o.noa
0.030
0.016
n.oi6
0.016
0.008
0.025
0.010
0.015
0.005
MG/L P
0.005K
0.005K
0.008K
0.010
0.016
0.012
0.016
0.008
0.005K
0.005K
0.005K
0.005
MG/L P
0.012
0.015
0.020
0.020
0.060
0.020
0.020
0.020
0.020
0.010K
0.010K
0.015
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
5TORET RETRIEVAL OATE
NATL EUTPOPHICATION SURVEY
EPA- I.AS VEGAS
5311B1
47 36 50.0 122 03 03.0 4
UNNAMEO CREEK
53 7.5 ISSAGUAH
T/SAMMAMISH LAKE 1311O1
9RDG ON 228TH AVE NE
11EPALES 2111214
oooo FEET DEPTH CLASS on
DATE TIME DEPTH NO?s,N03
FROM OF
TO DAY FEET
74/12/15 10 00
75/01/11 10 0"
75/02/08
75/02/23 12 10
75/03/0? 10 10
75/04/1? 10 00
75/OS/17 09 50
75/06/08 10 00
0630
S.N03
OTAI.
G/L
1.840
1.6«0
0.880
1.240
0.840
0.480
0.015
0.060
00625
TOT KJEL
N
MG/L
O.flOO
1.200
0.700
0.600
0.450
0.950
0.650
1.100
00610
MH3-N
TOTAL
MG/L
0.015
0.032
0.048
0.040
0.008
0.050
0.035
0.110
00671
PHOS-OIS
ORTHO
MG/L P
0.010
0.005
0.008K
0.008K
0.008K
0.005
0.005
0.020
00665
PHOS-TOT
MG/L P
0.020
0.030
0.010
0.010
0.020
0.020
0.020
0.070
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL DATE
NATL EUTPOPHICATION StlRVEY
EPA- LAS VEGAS
5311C1
47 33 12.0 122 04 00.0 4
UNNAMED CANAL
53 7.5 ISSAQUAH
T/SAMMAMISH LAKE 1311Q1
BROG ON ST PAWK «D 2 MI NW OF ISSAQUAH
11EPALES 2111204
ooon FEET DEPTH CLASS oo
DATE
FQOM
TO
74/09/29
74/10/19
74/11/17
74/12/15
75/01/11
75/02/08
75/02/23
75/03/02
75/04/12
75/05/17
75/06/Ofl
75/08/16
00630 00625
TIME OEPTH NO?*.N03 TOT KjEL
OF N-TOTAL N
OA>
09
10
10
09
09
10
11
09
09
09
09
10
' FEET
50
50
45
35
40
25
30
40
30
15
15
00
MG/L
0
0
0
0
0
0
0
0
0
0
0
n
.040
.072
.184
.526
.624
.240
.570
.336
.060
.005
.025
.045
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
600
400
800
600
500
600
600
400
400
200
300
00610 00671 00665
NH3-N PHOS-OIS DHOS-TOT
TOTAL 0»THO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
045
035
096
055
072
096
064
024
050
030
055
045
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
035
025
040
020
020
024
024
016
030
035
030
065
MG/L P
0.050
0.040
0.120
0.060
0.070
0.090
0.080
0.060
0.060
0.040
0.040
0.065
-------
STORET OETPIEVAL DATE 76/11/16
MAT! ruTROPriicATio"! SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02S.N03
For>M Of
TO OAV FEET
74/09/29
74/10/19
74/11/17
74/12/15
75/01/11
75/o2/oa
75/02/23
75/03/02
75/04/12
75/05/17
75/06/08
75/08/16
10 20
10 3^
09 ?0
09 40
09 45
10 35
1.1 45
10 00
09 45
09 30
09 45
09 50
531101
47 33 10.0 122 02 48.0 4
ISSAOtJAH CPEEK
S3 7.5 ISSAQUAH
T/SAMMAHISH LAKE 1 311^1
SEC *D BRDG 1.3 Ml NW OF ISSAQ'JAH
MEPALES ?1112n4
0000 FEET DEPTH CLASS 00
0630
«,N03
OTAL
G/L
0.504
0.6BO
0.640
1.280
1.400
0.950
1.200
0.920
0.760
0.620
0.500
0.510
00625
TOT KJEL
N
Mft/L
0.500
1.000
0.400
0.500
0.300
0.600
0.500
0.400
0.400
0.200
0.150
OOMO
NH3-N
TOTAL
M6/L
0.070
0.1?5
0.1?0
0.085
0.032
0.04fl
0.048
0.008
0.025
0.025
0.015
0.015
00671
PHOS-OIS
ORTHO
MG/L P
0.030
0.035
0.032
0.015
0.010
0.016
0.008
0.008K
0.010
0.015
0.010
0.020
00665
OHOS-TOT
MG/L P
0.055
0.065
0.070
0.030
0.032
0.030
0.030
0.040
0.020
0.015
0.010
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL DATE 7«,/ll/16
NATL FUTRQPHICATIOf" S'IRi/EY
EPA- LAS VEGAS
DATE TIME DEPTH NO?S,N03
FRO" OF
TO DAY FEET
74/09/29
74/10/19
74/11/17
74/13/15
75/01/11
75/03/08
75/03/23
75/03/03
75/04/12
75/05/17
75/06/08
75/03/16
10 05
11 00
10 50
09 35
09 30
10 30
11 40
09 50
09 40
09 30
09 30
10 10
5311E1
47 33 05.0 123 04 00.0 4
TI6BETTS CREEK
53 7.5 ISSAOUAH
T/SAMMAMISH LAKE 131131
8PDG ON 1-90 ?. MI NW OF ISSAOUAH
11EPALES 3111304
0000 FEET DEPTH CLASS 00
0630
S.N03
OTAL
fi/L
0.300
0.364
0.273
3.300
3.360
1.300
2.500
3.240
1.730
1.100
0.470
0.310
00625
TOT KJEL
N
MG/L
0.300
0.300
1.400
0.600
0.300
0.400
0.400
0.400
0.550
0.150
0.150
0.600
00610
MH3-N
TOTAL
MG/L
0.045
0.032
0.040
0.045
0.032
0.04H
0.024
0.016
0.025
0.0?5
0.030
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.010
0.016
0.010
0.010
0.008
0.008
0.008
0.005
0.005
0.015
0.015
0066^
PHOS-TOT
MG/L P
0.025
0.035
0.030
0.030
0.020
0.020
0.030
0.010K
0.010K
0.015
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF WASHINGTON
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Washington lakes sampled
are presented to allow direct comparison of the ranking, by parameter,
of each lake relative to the others. Median total phosphorus, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll a_ values are expressed in 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.
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
5301 AMEPICAN LAKE
5302 BANKS LAKE
530.1 CHELAN LAKE
5304 DIAMOND LAKE
5305 GREEN LAKE
5306 KEECHELUS LAKE
5307 MAYFIELD LAKE
5308 MEDICAL LAKE
5309 MOSES LAKF
5310 07ETTE LAKE
5311 SAMMAMISH LAKE
5312 WHATCOM LAKE
5313 LOWER GRANITE RESERVOIR
MEDIAN
TOTAL P
0.027
0.021
0.005
0.014
0.027
0.007
0.014
0.?75
0.115
0.010
0.015
0;009
(K033
MEDIAN
INORG N
0.105
0.040
0.070
0.060
0.050
0.040
0.100
0.225
0.150
0.110
0.210
0.320
0.150
500-
MEAN SEC
343.000
364.533
111.900
303.667
415.000
280.250
402.000
401.714
463.600
403.333
374.000
288.000
435.500
MEAN
CHLORA
4.822
7.373 ,
0.905
14.537
2.983
1.400
4.250
16.425
29.060
1.225
7.290
3.42?
4.875
15-
MIN DO
15.000
10.800
6.400
14.200
10.600
9.200
10.600
15.000
14.600
7.200
14.600
10.ROO
7.200
MEDI-
DISS ORTi
0.007
0.007
0.003
0.010
0.000
0.00?
0.007
0.166
0.038
0.009
0.006
0.009
0.0??
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
5301 AMERICAN LAKE
5302 BANKS LAKE
5303 CHELAN LAKE
5304 DIAMOND LAKE
5305 GREFN LAKE
5306 KEECHELUS LAKE
5307 MAYFIELD LAKE
5308 MEDICAL LAKE
5309 MOSES LAKE
5310 OZETTE LAKE
5311 SAMMAMISH LAKE
5312 WHATCOM LAKE
5313 LOWER GRANITE RESERVOIR
MEDIAN
TOTAL P
29 <
42 <
100 (
6? <
29 |
92 1
62 1
0 1
8 1
75 1
50 <
83 i
17 i
3)
: 5)
; 12)
: 7)
; 3)
i ii)
; 7)
[ 0)
i i)
I 9)
[ 6)
[ 10)
( 2)
MEDIAN
INORG N
50 (
100 (
67 1
75 1
83 1
92 1
58 1
8 1
29 1
42 (
17 i
0 '
29 i
6)
I 12)
; 8)
: 9)
! 10)
: ID
I 7)
I 1)
I 3)
[ 5)
t 2)
( 0)
( 3)
500-
MEAN SEC
67 (
58 1
100 1
75 1
17 I
92 1
33 1
42 I
0 i
25 I
50 i
83
8
1 8)
; 7)
[ 12)
I 9)
[ 2)
! 11)
: 4)
! 5)
( 0)
t 3)
( 6)
( 10)
( 1)
MEAN
CHLORA
50 <
25 (
100 (
17 1
75 1
83 1
58 1
8 1
0 1
92 1
33 i
67 i
42 i
6)
: 3)
! 12)
: 2)
[ 9)
; 10)
I 7)
I 1)
I 0)
I 11)
[ 4)
t 8)
t 5)
15-
MIN DO
4 (
46 (
100 (
33 (
62 (
75 (
62 (
* (
21 (
87 (
21 (
46 (
87 (
, 0>
5)
12)
4)
7)
9)
7)
0)
2)
10)
2)
5)
10)
MEDIAN
DISS ORTHO
58 (
71 (
92 1
?5 (
46 1
100 <
71 1
0 I
8 I
33 I
83 i
46
17
! 7)
; p>
! 11)
I 3)
! 5)
I 1?)
! *>
I 0)
I 1)
[ 4)
t 1")
f 5)
t 2)
------- |