WATER QUALITY STUDIES
OF THE
SPOKANE RIVER
BETWEEN
COEUR D'ALENE, IDAHO
AND
POST FALLS, IDAHO
1988
EPA 910/9-91-006
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TABLE OF CONTENTS
Page Number
List of Figures ii
List of Tables v
INTRODUCTION 1
FIELD STUDIES 4
RESULTS 7
CONCLUSIONS 34
BIBLIOGRAPHY 35
APPENDIX A-Measurements of Water Quality A-l
APPENDIX B - Method for Estimating Cross-Sectional Averages B-1
APPENDIX C - Citizens'Volunteer Monitoring Program C-l
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LIST OF FIGURES
Figure Number Page Number
1 Location map for the field study of the
Spokane River, August 16-18, 1988, showing
water quality sampling stations 2
2 Mean, maximum and minimum temperature
in the Spokane River between Lake Coeur d'
Alene and Post Falls Dam during the field study
of August 16-18,1988 9
3 Vertical profiles of temperature at
Stations 5 and 6 on August 18,1988 10
4 Mean, maximum and minimum dissolved
oxygen in the Spokane River between Lake
Coeur d'Alene and Post Falls Dam during the
field study of August 16-18, 1988 12
5 Vertical profiles of dissolved oxygen at
Stations 5 and 6 on August 18,1988 13
6 Mean, maximum and minimum conductivity
in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18,1988 15
7 Mean, maximum and minimum pH in the
Spokane River between Lake Coeur d'Alene
and Post Falls Dam during the field study of
August 16-18, 1988 16
8 Mean, maximum and minimum total
phosphorus in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18,1988 17
9 Mean, maximum and minimum NO2+NO3
in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18,1988 18
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LIST OF FIGURES (cont)
Figure Number Page Number
10 Mean, maximum and minimum Kjeldahl
Nitrogen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18, 1988 19
11 Mean, maximum and minimum Ammonia
Nitrogen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18, 1988 20
12 Mean, maximum and minimum ultimate
BOD in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18, 1988 22
13 Mean, maximum and minimum alkalinity
in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18,1988 24
14 Mean, maximum and minimum hardness
in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18, 1988 25
15 Mean, maximum and minimum total
arsenic in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam
during the field study of August 16-18,1988 26
16 Mean, maximum and minimum total
recoverable cadmium in the Spokane River
between Lake Coeur d'Alene and Post Falls during the
field study of August 16-18, 1988 27
17 Mean, maximum and minimum total
recoverable copper in the Spokane River
between Lake Coeur d'Alene and Post Falls during the
field study of August 16-18, 1988 28
in
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iLIST OF FIGURES (cont)
Figure Number Page Number
18 Mean, maximum and minimum total
recoverable chromium in the Spokane River
between Lake Coeur d'Alene and Post Falls during the
field study of August 16-18, 1988 29
19 Mean, maximum and minimum total
recoverable iron in the Spokane River
between Lake Coeur d'Alene and Post Falls during the
field study of August 16-18,1988 30
20 Mean, maximum and minimum total
recoverable lead in the Spokane River
between Lake Coeur d'Alene and Post Falls
Dam during the field study of
August 16-18, 1988 31
21 Mean, maximum and minimum total
recoverable mercury in the Spokane River
between Lake Coeur d'Alene and Post Falls
Dam during the field study of
August 16-18, 1988 32
22 Mean, maximum and minimum total
recoverable zinc in the Spokane River
between Lake Coeur d'Alene and Post Falls
Dam during the field study of
August 16-18, 1988 33
IV
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LIST OF TABLES
Table Number Page Number
1 Sampling activities for the Spokane River
field study, August 16-18, 1988 5
2 Daily discharge in the Spokane River near
Post Falls and gage height in Lake Coeur
d'Alene during August 1988 8
3 Mean, maximum and minimum of the
estimated deoxygenation rate, KI, in the
Spokane River during the field study of
August 16-18, 1988 21
4 Mean, maximum and minimum values
of water quality characteristics in the effluent
of the City of Coeur d'Alene's STP during
the field study of August 16-18, 1988 34
A-1 In-situ measurements of water quality in
the Spokane River during the field study of
August 16-18, 1988 A-2
A-2 Laboratory measurements of water quality
for receiving waters and point sources
during August 16-18,1988 A-14
A-3 Index for location of laboratory samples
for receiving waters and point sources
during the field study of August 16-18,1988 A-18
C-1 Water quality measurements in the
Spokane River at the Cedars Site C-l
C-2 Water quality measurements in the
Spokane River at Harbor Island C-2
C-3 Water quality measurements in the
Spokane River at Post Falls Bridge C-3
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INTRODUCTION
During the period August 15-18, 1988 EPA Region 10 conducted a field study of water
quality in the Spokane River between the outlet of Lake Coeur d'Alene and Post Falls Dam
(Figure 1). The primary purpose of this field study was to assess water quality in the Spokane
River during a period of low river flow and elevated water temperature. In addition, there is a
need for data to support the mathematical model of dissolved oxygen (DO) in the reach of the
Spokane River between its outlet from Lake Coeur d'Alene and the Post Falls Dam. A model
of the dissolved oxygen budget of this reach of the river has been used to develop permit
limitations for the City of Coeur d'Alene under EPA's National Pollution Discharge
Elimination System Permit (NPDES) program. It will also be used to evaluate the impact of
additional discharges to this segment, including the proposed discharge by the City of Hayden
Lake.
The reach of the river between the outlet of Lake Coeur d'Alene and Post Falls Dam
presently receives the discharge from the waste treatment plant of the City of Coeur d'Alene.
Coeur d'Alene has submitted plans to increase the discharge from this treatment plant. The
City of Hayden Lake is also considering locating the outfall from their treatment plant in this
reach of the river. Results from previous studies of water quality by the EPA (Yearsley, 1980)
and the USGS (Seitz and Jones, 1982) have shown that under certain hydrologic conditions
dissolved oxygen in the river decreases downstream from the treatment plant discharge.
Furthermore, the results of mathematical modelling (Yearsley, 1987) indicate that the proposed
increases in discharge of oxygen demanding material could lead to conditions for which the
water quality standards of the State of Idaho would be exceeded. Other water quality issues
which have been identified in the Spokane River basin are heavy metals toxicity and excess
nutrient loadings. The heavy metals toxicity is associated with mining activities on the Coeur
d'Alene River, which discharges into Lake Coeur d'Alene. Excess nutrients in the Spokane
River have been identified as the cause of accelerated rates of eutrophication in Long Lake, in
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Temperature, Dissolved Oxygen, pH,
Conductivity, BOD, Nutrients,
Metals, Water Clarity
Temperature, Dissolved Oxygen, pH,
Conductivity, Water Clarity
Station Number
Spokane River Mile
Figure 1. Location map for the field study of the Spokane River, August 16-18, 1988
showing water quality sampling stations
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the State of Washington. The Spokane River, which receives effluent from a number of
municipal and industrial sources, discharges to Long Lake several miles downstream from Post
Falls.
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FIELD STUDIES
In support of the objectives of assessing water quality , the field study program
included measurements of water quality constituents and parameters in both the receiving
waters and in effluent of municipalities presently discharging or considering discharge to the
segment of the Spokane River between Lake Coeur d'Alene and Post Falls Dam. Table 1
shows the survey dates and the type of information collected. Data collected during the survey,
including in situ and laboratory measurements, are given in Appendix A.
Receiving Waters
Data collected in the receiving waters included both observations made in the field and
measurements from samples shipped to the EPA Regional Laboratory at Manchester,
Washington. Temperature, DO, conductivity and pH measurements made in the field with a
Hydrolab Model 4000 Calibration procedures for the Hydrolab Model 4000 were done in
conformance with the manufacturers recommendations. The receiving water monitoring
program was designed so that data could be used to characterize the distribution of water
quality in both space and time. In situ measurements of temperature, DO, conductivity and pH
were made at several depths; in the right, middle and left one-thirds of the river at each of the
locations shown in Figure 1. This spatial sampling schedule was followed once in the morning
and once in the afternoon each day during the period of August 16-18, 1988.
Samples for the laboratory analysis of biological oxygen demand (BOD), nutrients, and
heavy metals were obtained at each of the locations shown Figure 1 by make a composite from
samples taken at several depths and at the right, middle and left sections of the station. The
samples of this type were collected during the morning only. The samples were stored in
polyethylene containers, packed in ice and shipped daily, via air freight, to the Regional
Laboratory at Manchester, Washington. Methods used for measurements made in the
laboratory follow procedures described in EPA (1983).
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Table 1. Sampling activities for Spokane River field study, August 16-18, 1989
Medium
Parameters
Spatial
Distribution
Sampling
Frequency
Receiving water
Point source
Temperature, DO,
pH, conductivity,
Secchi disk
BOD
(5-, 10, 15- and
20-day)
Total Metals
As
Total Recoverable
Metals
Cd,Cr,Cu,Fe,Pb,
Hg,Zn
Nutrients
Total P
Ammonia N
NO2+NO3-N
Kjeldahl N
Temperature, DO,
pH, conductivity
BOD
(5-, 10, 15- and
20-day)
Total Metals
As
Total Recoverable
Metals
Cd,Cr,Cu,Fe,Pb,
Hg.Zn
Nutrients
Total P
Ammonia N
NO2+NO3-N
KjeldahlN
Vertical profiles at
1/4, 1/2 and 3/4 of
the river width
Composite from
surface, mid-depth
and bottom at 1/4,
1/2 and 3/4 of river
width
Twenty-four hour
composite
Twenty-four hour
composite
Twice daily
August 16-18, 1989
Once daily
August 16-18, 1989
Once daily
August 15-18, 1989
Once daily
August 16-18, 1989
Suspended Solids
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Locations of receiving water sampling stations for which laboratory analyses were
performed are shown in Figure 1.
Point Sources
Samples from the municipal treatment facilities in Hayden Lake and Coeur d'Alene
were obtained from 24-hour composites of the each treatment plants effluent. For those
samples analyzed at the Regional Laboratory, handling and measurement procedures were the
same as for the receiving water samples as described above. Flow measurements were
obtained from measurement devices maintained at each facility.
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RESULTS
Receiving Waters
For purposes of analyzing the results, the receiving water data (Appendix A) were
aggregated in terms of time and depth-averages. The averaging method used to aggregate the
data is described in Appendix B.
River Flow and River Surface Elevation
River flow was not measured as part of the EPA Region 10 study. However, the U.S.
Geological Survey maintains a stream gage just below Post Falls Dam. Provisional records
from this station and observations of river surface elevation were made available by Mr. Stuart
Gutenberg of the USGS in Sand Point, Idaho. Data for the month of August are presented in
Table 2.
Water Temperature
Average, maximum and minimum water temperatures measured during the field studies
are shown in Figure 2. Averages are by station, across days. Maxima and minima are the
highest and lowest temperature, respectively, measured at each station during three-day study.
The distribution of water temperature during this field study was similar to that found during
the field study of August 16-17,1979 (Yearsley, 1980). Average temperatures ranged from
21.4 °C to 22.9 °C. For those segments of the river with water depths less than
approximately seven meters, temperatures were nearly uniform from top to bottom and from
left bank to right bank. In those segments for which water depth was greater than seven meters
(Station 6 , 8 and Post Falls Dam), there was a thermocline from a depth of seven meters to the
bottom. Vertical profiles of temperatures at a station with depth less than seven meters (Station
5) and greater than seven meters (Station 6) are shown in Figure 3.
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Table 2. Daily discharge in the Spokane River near Post Falls and gage height in Lake Coeur
d'Alene during August 1989 (preliminary information from the USGS).
Day
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Discharge (cfs)
684
729
545
431
463
494
476
470
393
344
338
334
348
346
337
338
357
350
346
344
346
344
340
338
340
336
327
318
319
329
359
Gage Height (feet)
2127.82
2127.80
2127.82
2127.83
2127.82
2127.83
2127.80
2127.81
2127.81
2127.81
2127.80
2127.81 •
2127.82
2127.82
2127.82
2127.79
2127.80
2127.81
2127.79
2127.79
2127.78
2127.78
2127.78
2127.79
2127.78
2127.75
2127.75
2127.76
2127.77
2127.75
2127.72
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CJ
ab
2
0)
I
23
22-
21-
20
19-
18
100
102
104
106
108
B
O
110
112
D Mean
A Maximum
0 Minimum
Spokane River Mile
Figure 2. Mean, maximum and minimum temperature in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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1
5-
10-
15
20
18
Q A
Q A
El A
Q
Approximate Depth of
Thermocline
19
20
21
22
13 Station 5
A Station 6 <=>
23
Temperature - deg. C
Figure 3. Vertical profiles of temperature at Stations 5 and 6 on August 18,1988.
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11
The lowest temperature observed at depth during the study was 18.6 °C at Post Falls
Dam Data collected in the State of Idaho's Volunteer Monitoring Program (Appendix C) show
that temperature of the water surface was 19 °C between May 25, 1988 and June 25, 1988.
This implies that the water at depth with temperatures of less than 19 °C had been there for at
least five to six weeks.
Dissolved Oxygen
Daily cross-sectional averages of concentrations and saturation levels for dissolved
oxygen, measured at each station during the field study, are shown Figure 4. Stations 1-5
show a consistent increase in the average concentration from morning to afternoon. These
stations are all fairly shallow and well-mixed from top to bottom. Water transparency, as
measured by Secchi disk, were generally in the range of 3.0 to 4.0 meters at these stations. .
Assuming that the depth of active photosynthesis is given by 1.7*Secchi depth, Stations 1-5
are shallow enough that the cross-sectional average is affected by photosynthetic activity.
Stations 6, 8 and Post Falls Dam show a consistent increase from morning to afternoon for
cross-sectional averages only for the top five meters. The total cross-sectional average at these
three stations is controlled by the extremely low values of DO occurring at depth.
Photosynthesis has a much smaller role in the DO at depth. As a result, the deeper stations
have less diurnal variability in depth-averaged value of DO than do the shallow stations.
When the flow in the Spokane River is low, vertical mixing is reduced and, as
described above, a thermocline develops at those locations for which water depth is greater
than approximately seven meters. The vertical distribution of DO is also affected by the
reduced mixing and at DO also decreases rapidly at depths greater than approximately seven
meters. Vertical profiles of DO at a shallow station (Station 5) and a deep station (Station 6)
are compared in Figure 5.
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8
c
5
•3
VI
5
10
8-
6-
100
A
B
A
D
A
Q
A A
El
102
104 106 108
Spokane River Mile
110
B Mean
A Maximum
0 Minimum
112
Figure 4. Mean, maximum and minimum dissolved oxygen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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5-
10-
15-
20
Approximate Depth of
Thermocline
4 6
DO-mg/1
A 0
A m
A E
Q
D Station 5
A Station 6
10
Figure 5. Vertical profiles of dissolved oxygen (DO) at Stations 5 and 6 on August 18,1988.
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14
Conductivity and pH
Conductivity and pH were measured both in the field with the Hydrolab Survey Model
4000 and in the laboratory. Cross-sectional averages of the conductivity measured in the field
for the three-day sampling period are given in Figure 6.
Average pH increases monotonically downstream from the outlet of Lake Coeur
d'Alene, as shown in Figure 7.
Nutrients
Concentrations of total phosphorus, nitrate+nitrite-nitrogen, Kjeldahl nitrogen and total
ammonia-nitrogen, averaged over the three-day period of the field study, are shown in Figures
8 through 11. Average total phosphorus were below the detection level (0.01 mg/1) at the
outlet of Lake Coeur d'Alene. Average total phosphorus increased to 0.055 mg/1 at the first
river sampling station downstream from the STP. As shown in Figure 8, the average
concentration of total phosphorus decreased in a downstream direction after the initial pulse
was introduced by the STP. Possible sinks for total phosphorus include uptake by attached
algae and macrophytes and uptake by planktonic algae which eventually settle to the bottom of
the river. No data were collected during this survey for testing either of these hypotheses.
Nitrate+nitrite-nitrogen in the Spokane River was below the level of detection (0.01
mg/I) throughout the field study (Fig. 9). Both Kjeldahl nitrogen and total ammonia-nitrogen
were greater at the station just downstream from the discharge of the STP, as shown in Figures
10 and 11. However, Kjeldahl nitrogen and ammonia-nitrogen decreased downstream after
the initial increase. Volatilization, nitrification, and algal uptake are potential sinks for
ammonia. When nitrification occurs, the loss in ammonia-nitrogen should be accompanied by
an increase in nitrate-nitrogen. The measurements of nitrate+nitrite-nitrogen made in this study
do not show an increase in nitrate+nitrite-nitrogen corresponding to the decrease in ammonia-
nitrogen. Insufficient information was available to determine the importance of volatilization or
algal uptake to the nitrogen budget.
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I
>*
o
60
58-
56-
54-
52-
50
102
A
Q
A
Q
O
A
ID
O
A
Q
Q Mean
A Maximum
° Minimum
104
106 108
Spokane River Mile
110
112
Figure 6. Mean, maximum and minimum conductivity in the Spokane River between Lake
Coeur d'Alene and Post Falls Dam during the field of study of August 16-18, 1988.
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.§
3
1
GO
i
7.5
7.0-
6.5-
6.0-
5.5
A
D
O
A
0
O
A
0
0
Q
O
Q Mean
A Maximum
° Minimum
102
104
106 108
Spokane River Mile
110
112
Figure 7. Mean, maximum and minimum pH in the Spokane River between Lake Coeur
d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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•§>
E
I
0.10
0.08-1
0.06-1
0.04-J
0.02-J
0.00
102
D
O
Q Mean
A Maximum
° Minimum
104
106 108
Spokane River Mile
110
112
Figure 8. Mean, maximum and minimum total phosphorus in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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0.011
I
0.010-^
0.009
13 Mean
A Maximum
0 Minimum
00
102
104
106
108
110
112
Spokane River Mile
Figure 9. Mean, maximum and minimum NO2+NO3-Nitrogen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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•§,
6
2
13
0.4
0.3 -]
o.i-
0.0
102
Q Mean
A Maximum
° Minimum
104
106
108
110
112
Spokane River Mile
Figure 10. Mean, maximum and minimum Kjeldahl Nitrogen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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I
0.15
0.10-
0.05-
0.00
102
a
o
Q Mean
A Maximum
0 Minimum
104
106
108
110
112
Spokane River Mile
Figure 11. Mean, maximum and minimum NH3 Nitrogen in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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21
Biological Oxygen Demand (BODI
Ultimate BOD, Luit, and rates of deoxygenation,Ki, were determined from standard,
uninhibited 5-, 10-,15-,20- and 60-day BOD measurements from samples obtained on each of
the three days during the field study. The parameters Luit and Kl were estimated by
minimizing the squared difference between the observations and the equation for BOD:
-K.t
L = LuUe 1 (1)
where,
L = the BOD at any time, t, mg/1
Luit = the ultimate BOD, mg/1
t = time, days
KI = the deoxygenation rate constant, days"1.
The simplex method for minimizing a nonlinear function (Nelder and Mead, 1964) was
used to find the minimum. The mean, maximum and minimum ultimate BOD for the receiving
water stations are shown in Figure 12, the estimated values of the deoxygenation rates, KI, are
shown in Table 3.
Table 3. Mean, maximum and minimum of the estimated deoxygenation rate, KI, in the
Spokane River during the field study of August 16-18,1988.
Deoxygenation Rate, KI, days'1
Spokane River Mile
111.1
108.6
106.5
104.4
102.2
Mean
0.05
0.05
0.08
0.09
0.08
Maximum
0.06
0.05
0.13
0.14
0.10
Minimum
0.04
0.05
0.06
0.06
0.06
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I
I
§
«
9
a
•a
4-
3-
2-
Q
O
13 Mean
* Maximum
0 Minimum
to
to
102
104
106
108
110
112
Spokane River Mile
Figure 12. Mean, maximum and minimum ultimate BOD in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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23
Alkalinity and Hardness
Mean, maximum and minimum of observed alkalinity and hardness in the Spokane
River during the field study are shown in Figures 13 and 14, respectively. Both hardness and
alkalinity increase downstream implying a continuous inflow along the entire reach.
Groundwater inflow (Drost and Seitz, 1978) represents a potential source.
Metals
Average concentrations of total arsenic, total recoverable cadmium, total recoverable
copper, total recoverable chromium,total recoverable iron, total recoverable lead, total mercury,
and total recoverable zinc are shown in Figures 15 through 22.
Point Sources
Water samples from the Coeur d'Alene STP, composited over a 24-hour period, were
collected on August 16, 17, 18, and 19, 1989. The average, maximum and minimum for
measurements of flow rates, nutrients, metals, BOD and conductivity are given in Table 4.
Average flow of the STP on each of these days was obtained from the flow-measuring device
operated by the STP. Loadings were estimated as the product of the average flow times the
measured concentration of the composited sample. The loadings estimated in this way are also
given in Table 4.
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t
8
y
o
(A
at
22.
21-
20-
19-
18
102
B
O
A
B
Q Mean
A Maximum
° Minimum
to
104
106
108
110
112
Spokane River Mile
Figure 13. Mean, maximum and minimum alkalinity in the Spokane River between Lake
Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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•a
e
cA 22-
O
U
6
CO
c3
CO
CO
0>
1
K
"3 21.
o
H
90-
A
A
D A
D Q
A 0 A
m
0 0
Q
0
D Mean
A Maximum
° Minimum
to
Ul
102
104
106 108
Spokane River Mile
no
112
Figure 14. Mean, maximum and minimum hardness in the Spokane River between Lake
Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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I
1.0-
0.8-
0.6-
0.4.
0.2.
0.0.
100
D
O
A
D
Q Mean
A Maximum
° Minimum
to
o\
102
104 106
Spokane River Mile
108
110
112
Figure 15. Mean, maximum and minimum total arsenic in the Spokane River between Lake
Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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s.
I
1.5
1.0-
0.5-
0.0
100
Q
O
n
o
Q Mean
A Maximum
° Minimum
to
102
104
106
108
110
112
Spokane River Mile
Figure 16. Mean, maximum and minimum total recoverable cadmium in the Spokane River
between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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I
3
u
u
1
b
§
10
8-
6-
4-
2-
102
Q Mean
A Maximum
0 Minimum
104
106
108
110
112
to
oo
Spokane River Mile
Figure 17. Mean, maximum and minimum total recoverable copper in the Spokane River
between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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d3
u
4-
3-1
2-
1-
100
Q
O
102
A
8
104 106 108
Spokane River Mile
110
Q Mean
A Maximum
° Minimum
112
Figure 18. Mean, maximum and minimum total recoverable chromium in the Spokane River
between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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o
100.
80-
60-
40-
20-
100
D
O
102
A
3
A
Q
O
Q Mean
A Maximum
0 Minimum
104 106 108
Spokane River Mile
110
112
Figure 19. Mean, maximum and minimum total recoverable iron in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
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fi
4-
3-
2-
1-
100
D
O
102
A
Q
Q
O
104
106
108
Spokane River Mile
Q
O
110
112
Q Mean
A Maximum
° Minimum
Figure 20. Mean, maximum and minimum total recoverable lead in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988.
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f
bo
ffi
u
1
0.5
0.4-1
0.3-
0.1-
0.0
100
A
D
o
102
13 Mean
A Maximum
° Minimum
104 106 108
Spokane River Mile
110
112
U)
to
Figure 21. Mean, maximum and minimum total recoverable mercury in the Spokane River
between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
-------
•§>
3
'
U
s
G
^
(U
Di
a
o
£
90-
80-
70-
60-
50-
40-
30-
20-
10-
0-
A
Q
0 °
A
D A
0 °
6
o
Q Mean
A Maximum
° Minimum
100
102
104 106 108
Spokane River Mile
110
112
Figure 22. Mean, maximum and minimum total recoverable zinc in the Spokane River between
Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988.
-------
34
Table 4. Mean, maximum and minimum values of water quality characteristics of the effluent
of City of Coeur d'Alene's STP during the field study of August 16-18, 1988. Loadings for
BOD, nutrients and metals are also shown.
Parameter
Flow - cfs
Deoxygenation Rate,
KI - days'1
pH - standard units
Conductivity -
}imho/cm
Alkalinity as CaCOs
-mg/1
Hardness as CaCOs
-mg/1
NHs-Nitrogen - mg/1
NO2+NOs-Nitrogen
-mg/1
Kjeldahl Nitrogen -
mg/1
Total Phosphorus -
mg/1
Total As - Hg/1
Total Recoverable
Cd-ng/1
Total Recoverable
Cu - ng/1
Total Recoverable Cr
Total Recoverable
Total Recoverable
Hg-ng/1
Total Recoverable
Mean
4.24
0.07
6.7
674
197
71
15.8
1.2
22.3
7.0
1.5
0.70
5.9
3.5
5.3
0.11
31
Parameter Value
Maximum
4.45
0.08
6.7
677
202
110
16.6
1.6
23.0
7.2
1.8
1.0
14.4
'
4.0
7.0
0.17
51
Minimum
4.09
0.06
6.7
672
193
32
14.7
0.8
21.5
6.8
1.4
0.5
1.6
3.1
4.0
0.08
0
Loading
Pounds/Day
—
—
—
—
—
360
28.1
510
160
0.04
0.02
0.10
0.08
0.10
0.003
0.71
Zn-ng/1
-------
35
CONCLUSIONS
The results of the field study conducted during the period August 16-18, 1988 were
were similar to those of earlier studies (Yearsley, 1980) in a number of ways. Major
conclusions derived from the results include:
• Dissolved oxygen was low at those locations in the river where a thermocline had formed.
The depth of the thermocline was generally at a depth of approximately seven meters and was
observed in two segments of the river. One of these segments was near Ford Rock (Spokane
River Mile 104.4) and the other was in the forebay of Post Falls Dam (Spokane River Mile
102.2).
• The City of Coeur d'Alene's STP contributes a significant load of phosphorus to the
Spokane River. Upstream from the STP discharge the observed concentration of total
phosphorus was below the detection limit of 0.01 mg/1. The mean value of observed total
phosphorus downstream from the STP was 0.055 mg/1. The estimated average loading of total
phosphorus from the STP was 160 pounds/day during this period.
In addition, the results of the August 16-18, 1988 field study showed that the City of
Coeur d'Alene' STP contributed significantly to the BOD loading and to the loading of
nitrogen, primarily in the form or organic nitrogen and ammonia.
-------
36
BIBLIOGRAPHY
Drost, B.W. and H.R. Seitz. 1978. Spokane Valley-Rathdrum Prairie Aquifer, Washington
and Idaho, U.S. Geological Survey Open-File Report 77-289.
Seitz, H.R. and M.L. Jones. 1982. Flow characteristics and water-quality conditions in the
Spokane River, Coeur d'Alene Lake to Post Falls Dam, northern Idaho. USGS Open-
File Report 82-102. 56pp.
Yearsley, J.R. 1980. Water quality studies of the Spokane River between Coeur d'Alene,
Idaho and Post Falls, Idaho, 1978-1979. EPA Region 10, Seattle, WA. 53 pp.
Yearsley, J.R. 1987. An estimate of NPDES permit limits for the Cities of Post Falls and
Coeur d'Alene, Idaho. ESD, EPA Region 10, Seattle, WA.
-------
APPENDIX A
Measurements of Water Quality in the Receiving Waters
and from Point Sources in the Spokane River
between Coeur d'Alene and Post Falls, Idaho
In situ measurements of water quality in the Spokane River between Coeur d'Alene and
Post Falls, Idaho during the period August 16-18,1988 are given in Table A-l. Station
locations can be obtained from Figure 1. Laboratory measurements of various water quality
characteristics from both receiving waters and point sources are given in Table A-2. The key
relating laboratory sample numbers and station location is given in Table A-3.
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
Time
hm
630
650
700
713
718
723
734
746
754
805
813
820
833
842
851
905
906
910
918
929
935
Station
Location
#1 Right
#lMid
#lLeft
#2 Right
#2 Mid
#2 Left
#3 Right
#3 Mid
#3 Left
#3A Right
#3 A Mid
#3 A Left
#4 Right
#4 Mid
#4 Left
#4 A Right
MA Mid
#4ALeft
#5 Right
#5 Mid
#5 Left
Depth
m
0.9
2.8
0.3
2.0
0.8
2.4
0.7
3.2
0.7
2.8
0.7
2.1
0.3
2.6
0.9
3.3
0.8
2.4
0.8
2.8
0.9
3.1
0.9
3.1
0.6
5.5
0.5
5.1
0.8
3.5
0.7
2.6
0.7
5.6
0.9
6.5
0.7
5.9
0.8
5.9
0.9
5.0
Temp
C
20.34
20.37
20.14
20.17
20.20
20.22
20.31
20.35
20.39
20.31
20.24
19.99
20.80
20.86
20.94
20.97
20.91
20.90
21.26
21.30
21.27
21.24
21.31
21.16
21.42
21.45
21.48
21.33
21.50
21.52
21.72
21.75
21.82
21.81
21.82
21.78
21.93
21.88
21.92
21.82
21.95
21.90
DO
mg/L
7.45
8.07
8.16
8.09
8.08
7.93
7.95
7.88
7.92
7.91
7.97
7.88
7.78
7.60
7.84
7.77
8.06
7.96
7.23
7.18
7.68
7.87
7.86
7.87
8.10
8.05
8.08
7.79
7.97
7.97
8.61
8.57
8.52
8.46
8.51
8.32
8.71
8.40
8.72
8.65
8.73
8.73
DO
%Sat
88.3
95.7
96.3
95.6
95.5
93.8
94.2
93.4
94.0
93.7
94.3
92.8
93.0
91.0
94.0
93.2
96.6
95.4
87.2
86.7
92.7
94.9
94.9
94.7
98.0
97.5
97.9
94.0
96.6
96.6
104.8
104.4
103.8
103.1
103.7
101.4
106.4
102.5
106.5
105.4
106.7
106.6
Cond
umho/cm
48
48
48
48
49
49
53
52
51
49
49
50
52
53
53
53
53
53
53
53
54
53
52
53
53
53
52
52
53
53
53
52
54
52
52
52
52
52
52
52
52
52
PH
std units
7.54
7.79
7.45
7.66
7.37
7.59
7.45
7.53
7.55
7.41
7.52
7.29
7.51
7.20
7.21
7.24
7.32
7.04
6.75
7.11
7.29
7.28
7.16
7.25
7.18
7.38
7.04
7.40
7.01
7.36
7.07
7.50
7.48
7.52
7.38
7.47
7.32
7.57
7.52
7.77
7.46
7.84
Secchi Depth
meters
3.0
4.0
*
3.8
3.5
4.0
3.8
3.5
3.3
3.6
A-2
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
Time
hm
954
1001
1008
1020
1030
1035
1044
1430
1437
1441
1445
1452
1454
1500
Staloc
#6 Right
#6 Mid
#6 Left
#8 Right
#8 Mid
#8 Left
P.F. Dam
LakeEnt
#1 Right
tflMid
#lLeft
#2 Right
#2 Mid
#2 Left
Depth
m
0.8
2.0
5.0
7.0
7.7
0.8
2.0
5.0
7.0
0.2
2.0
3.0
0.9
2.0
5.0
7.0
8.9
0.9
2.0
0.9
0.8
2.0
5.0
7.0
10.0
12.5
1.1
2.0
5.0
1.0
2.0
1.0
2.2
1.0
3.3
1.0
3.0
1.0
3.2
1.0
2.0
Temp
C
22.04
22.03
21.91
21.91
21.81
22.05
22.03
21.98
21.83
22.05
22.04
21.99
22.05
21.98
21.90
21.82
21.48
22.02
22.05
22.08
22.06
22.01
21.89
21.73
21.12
19.04
21.74
21.58
21.23
21.34
21.34
21.42
21.11
21.42
21.03
21.33
21.01
21.16
21.01
21.08
21.01
DO
mg/L
8.26
8.29
8.15
7.64
7.09
8.41
8.39
8.33
7.53
8.46
8.39
8.42
8.31
8.26
8.18
7.88
4.46
8.35
8.35
8.46
8.18
8.07
7.82
6.65
3.13
0.18
7.56
7.55
7.62
8.29
8.23
8.16
8.25
8.34
8.42
8.09
8.28
8.27
8.16
8.47
8.40
DO
%Sat
101.1
101.4
99.5
93.3
86.4
102.9
102.6
101.9
91.8
103.6
102.7
102.9
101.8
101.0
99.9
96.0
54.0
102.2
102.2
103.6
100.2
98.8
95.5
80.9
37.6
2.0
92.1
91.7
91.9
100.1
99.4
98.7
99.2
100.9
101.2
97.7
99.4
99.5
97.9
101.8
100.8
Cond
umho/cm
52
51
52
52
51
52
52
52
52
52
52
52
51
51
51
51
51
52
52
51
52
51
52
51
51
51
49
50
49
49
49
49
50
50
50
59
55
51
55
51
51
PH
std units
7.43
7.53
7.50
7.34
7.13
7.48
7.33
7.64
7.26
7.37
7.52
7.58
7.30
7.40
7.53
7.42
6.85
7.39
7.44
7.46
7.44
7.41
7.26
6.91
6.63
6.46
7.21
7.28
7.36
7.56
7.66
7.48
7.64
7.51
7.68
7.22
7.37
7.44
7.38
7.64
7.67
Secchi Depth
meters
4.5
4.2
'•
4.5
A-3
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18,1988.
Date
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
Tune
hm
1506
1510
1515
1520
1525
1528
1536
1541
1545
1550
1557
1603
1606
1609
1615
1620
1630
Staloc
#3 Right
#3 Mid
#3 Left
#3A Right
#3 A Mid
#3 A Left
#4 Right
#4 Mid
#4 Left
#4 A Right
MAMid
#5 Right
#5 Mid
#5 Left
#6 Right
#6 Mid
#6 Left
Depth
m
1.0
2.6
1.0
3.5
1.0
2.2
1.0
3.0
1.0
3.2
1.0
2.5
1.0
5.5
1.0
5.4
1.0
1.0
1.7
1.0
6.7
1.0
5.8
1.0
6.5
1.0
3.1
1.0
2.0
5.0
8.0
1.0
2.0
5.0
7.0
10.0
11.0
1.0
Temp
C
21.45
21.32
21.37
21.31
21.45
21.38
21.79
21.47
21.79
21.47
21.78
21.49
22.14
21.44
22.19
21.40
22.25
22.53
22.21
22.43
21.80
22.86
21.95
22.78
21.91
22.66
22.10
22.57
22.41
22.02
22.41
22.50
22.36
22.05
21.86
21.09
20.71
22.47
DO
mg/L
8.33
8.18
8.34
8.23
8.59
8.28
8.00
7.97
8.33
8.64
8.53
8.80
8.46
7.82
8.60
8.15
8.73
8.62
8.64
9.13
7.63
8.82
8.50
8.73
8.39
8.87
8.81
8.71
8.56
8.44
8.56
8.71
8.63
8.46
6.66
4.43
3.80
8.69
DO
%Sat
100.9
98.8
100.8
99.4
104.0
100.1
97.4
96.5
101.5
104.6
103.9
106.5
103.8
94.7
105.6
98.5
107.3
106.5
106.1
112.5
93.0
109.6
103.8
108.3
102.4
109.8
108.0
107.7
105.5
103.3
105.5
107.5
106.2
103.6
81.2
53.3
45.3
107.3
Cond
umho/cm
54
53
53
54
53
53
53
53
53
53
53
53
53
53
54
52
52
53
53
54
53
53
52
53
52
53
52
52
52
51
52
53
52
52
52
52
53
52
pH
std units
7.21
7.28
7.28
7.34
7.44
7.36
7.11
7.18
7.27
7.41
7.34
7.34
7.27
7.15
7.36
7.24
7.47
7.94
7.95
7.68
7.37
7.57
7.46
7.68
7.51
7.70
7.72
7.61
7.55
7.39
7.55
7.59
7.59
7.61
6.95
6.69
6.62
7.54
Secchi Depth
meters
A-4
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18,. 1988.
Date
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/16/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
Time
hm
1645
1650
1656
1700
630
640
646
656
700
704
711
720
730
742
747
750
Staloc
#8 Right
#8 Mid
#8 Left
P.P. Dam
#1 Right
#lMid
tflLeft
#2 Right
#2 Mid
#2 Left
#3 Right
#3 Mid
#3 Left
#3A Right
#3AMid
#3 A Left
Depth
m
2.0
5.0
8.9
1.0
2.0
5.0
7.2
10.0
1.0
2.0
1.0
1.0
2.0
5.0
7.0
10.0
11.9
1.0
2.8
1.0
2.0
1.0
2.9
1.0
2.8
1.0
2.9
1.0
2.2
1.0
3.0
1.0
3.7
1.0
2.6
1.0
3.3
1.0
3.2
1.0
3.0
Temp
C
22.33
22.01
21.46
22.67
22.61
22.07
21.88
21.45
22.58
22.46
22.47
22.68
22.63
22.03
21.89
21.06
19.49
20.59
20.53
20.60
20.65
20.63
20.63
20.85
20.86
20.93
20.66
20.90
20.75
20.49
20.47
20.54
20.56
20.51
20.48
20.89
20.80
20.94
20.80
20.93
20.75
DO
mg/L
8.59
8.22
4.64
8.52
8.25
8.30
7.29
2.35
8.46
8.36
8.67
8.20
8.32
8.19
6.88
2.13
0.01
7.93
7.88
7.81
7.67
7.53
7.56
7.88
7.73
7.80
7.89
7.70
7.83
7.60
7.46
7.88
7.75
8.14
7.89
7.67
7.72
7.50
7.69
7.53
7.77
DO
%Sat
105.7
100.6
56.2
105.5
102.0
101.6
88.9
28.5
104.6
103.1
106.9
101.6
103.0
100.3
84.0
25.6
0.1
94.5
93.7
93.1
91.4
89.7
90.2
94.3
92.5
93.4
94.1
92.3
93.6
90.4
88.7
93.7
92.2
96.8
93.7
91.8
92.3
89.9
92.0
90.2
92.8
Cond
umho/cm
52
52
53
51
51
51
50
52
52
52
52
53
51
51
52
52
52
49
48
49
48
48
48
58
58
54
54
50
50
52
52
52
52
51
51
53
53
53
53
53
53
PH
std units
7.63
7.31
6.78
7.47
7.42
7.40
7.17
6.54
7.44
7.41
7.71
7.44
7.50
7.44
7.09
6.56
6.37
7.47
7.44
7.41
7.36
7.30
7.31
7.30
7.26
7.26
7.44
7.38
7.46
7.26
7.23
7.34
7.29
7.47
7.41
7.20
7.20
7.15
7.22
7.15
7.23
Secchi Depth
meters
'•
3.4
4.1
A-5
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
Time
hm
755
806
814
823
827
831
840
847
857
905
915
930
Station
Location
#4 Right
#4 Mid
#4 Left
#4A Right
#4AMid
#4ALeft
#5 Right
#5 Mid
#5 Left
#6 Right
#6 Mid
#6 Left
Depth
m
1.0
2.0
5.0
1.0
2.0
5.0
1.0
2.0
1.0
1.5
1.0
1.5
1.0
2.0
5.0
6.5
1.0
2.0
5.9
1.0
2.0
5.0
6.1
1.0
2.0
5.0
6.0
1.0
2.0
5.0
7.0
7.8
1.0
2.0
5.0
7.0
10.0
12.8
1.0
2.0
5.0
7.5
10.0
Temp
C
21.29
21.35
21.32
21.36
21.37
21.32
21.32
21.36
21.42
21.40
21.60
21.40
21.63
21.63
21.63
21.62
21.73
21.78
21.70
21.75
21.78
21.75
21.72
21.76
21.78
21.72
21.65
21.81
21.83
21.84
21.83
21.58
21.89
21.89
21.83
21.79
21.02
19.87
21.90
21.90
21.86
21.83
21.11
DO
mg/L
8.01
7.92
7.92
8.05
7.96
7.97
8.24
8.22
8.71
8.63
8.56
8.63
8.52
8.42
8.39
8.37
8.44
8.30
8.25
8.42
8.38
8.29
8.25
8.42
8.32
8.33
8.30
8.20
8.17
8.17
8.10
6.97
8.30
8.23
7.52
7.54
4.55
1.81
8.32
8.28
8.21
7.86
3.02
DO
%Sat
96.6
95.8
95.6
97.2
96.2
96.3
99.5
99.3
105.4
104.4
104.0
104.4
103.5
102.2
101.9
101.6
102.7
101.0
100.3
102.6
102.1
100.9
100.4
102.6
101.4
101.4
100.8
100.0
99.6
99.6
98.8
84.6
101.4
100.5
91.7
91.8
54.6
21.2
101.6
101.0
100.2
95.8
36.3
Cond
umho/cm
52
54
53
53
53
52
52
53
52
52
53
52
53
53
53
52
52
53
52
52
53
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
52
55
PH
std units
7.25
7.24
7.23
7.27
7.15
7.24
7.32
7.33
7.47
7.47
7.37
7.47
7.34
7.42
7.45
7.39
7.38
7.34
7.36
7.35
7.38
7.37
7.35
7.37
7.35
7.40
7.38
7.38
7.38
7.39
7.38
6.91
7.39
7.43
7.16
7.11
6.71
6.47
7.34
7.41
7.42
7.23
6.61
Secchi Depth
meters
4.0
3.9
3.6
*
3.5
3.5
3.7
A-6
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
Time
hm
942
952
1002
1008
1435
1440
1445
1453
1458
1502
1509
1512
1516
1521
1528
1532
Station
Location
#8 Right
#8 Mid
#8 Left
P.F. Dam
#1 Right
#lMid
#lLeft
#2 Right
#2 Mid
#2 Left
#3 Right
#3 Mid
#3 Left
#3A Right
#3 A Mid
#3 A Left
Depth
m
1.0
2.0
5.0
7.0
10.0
1.0
2.0
5.0
7.0
8.0
1.0
1.0
2.0
5.0
7.0
10.0
13.4
0.8
2.8
1.0
2.8
1.0
2.8
1.0
2.5
1.0
3.0
1.0
2.0
1.0
2.6
1.0
3.1
1.0
2.2
1.0
3.0
1.0
2.8
1.0
2.5
Temp
C
21.82
21.85
21.83
21.79
21.38
21.88
21.88
21.85
21.82
21.75
21.78
21.91
21.92
21.88
21.83
21.19
18.58
21.37
21.34
21.34
21.32
21.63
21.31
21.40
21.14
21.15
21.13
21.19
21.16
21.12
21.05
21.05
21.00
21.04
21.02
21.33
21.09
21.23
20.99
21.15
21.00
DO
mg/L
8.21
8.17
8.02
7.67
2.79
8.22
8.18
8.17
7.92
6.94
8.30
7.94
7.98
7.79
7.73
1.63
0.15
7.66
7.59
7.48
7.43
6.77
7.63
7.85
7.82
7.87
7.92
8.02
7.92
8.09
8.18
8.07
8.18
8.43
8.45
7.91
7.92
8.22
8.47
8.73
8.54
DO
%Sat
100.1
99.6
97.7
93.4
33.7
100.3
99.9
99.6
96.5
84.5
101.1
97.0
97.5
95.0
94.2
19.6
1.7
92.5
91.7
90.4
89.8
82.2
92.1
94.9
94.1
94.7
95.2
96.6
95.3
97.3
98.3
97.0
98.2
101.3
101.5
95.5
95.2
99.1
101.7
105.1
102.5
Cond
umho/cm
52
52
52
52
51
52
52
51
51
51
52
52
52
52
52
52
53
49
49
49
49
49
48
54
52
51
51
51
50
52
52
52
53
52
52
53
53
52
53
52
53
PH
std units
7.39
7.39
7.38
7.25
6.60
7.20
7.31
7.35
7.26
6.96
7.37
7.26
7.26
7.21
7.15
6.54
6.35
7.48
7.35
7.14
7.18
8.20
7.37
7.28
7.33
7.27
7.36
7.44
7.48
7.35
7.46
7.26
7.43
7.46
7.56
7.06
7.22
7.35
7.64
7.36
7.52
Secchi Depth
meters
4.0
A-7
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
Time
h m
1541
1545
1550
1555
1600
1610
1617
1623
1629
1638
1646
1700
Station
Location
#4 Right
#4 Mid
#4 Left
#4A Right
#4AMid
MA Left
#5 Right
#5 Mid
#5 Left
#6 Right
#6 Mid
#6 Left
Depth
m
1.0
4.8
1.0
5.6
1.0
3.0
1.0
1.7
1.0
2.0
5.0
7.1
1.0
2.0
5.0
1.0
2.0
5.0
1.0
2.0
5.7
1.0
2.0
1.0
2.0
5.0
7.0
1.0
2.0
5.0
7.0
10.0
12.0
15.6
1.0
2.0
5.0
7.0
10.0
Temp
C
22.33
21.30
21.97
21.26
21.74
21.58
22.26
22.13
22.30
22.07
21.72
21.67
22.37
22.20
21.72
22.47
22.01
21.85
22.35
22.07
21.81
22.44
22.04
22.38
22.25
21.93
21.87
22.50
22.21
21.95
21.82
21.14
20.34
18.90
22.56
22.47
21.94
21.83
21.13
DO
mg/L
8.54
8.17
8.47
8.24
8.80
8.58
9.08
9.19
8.93
8.88
8.41
8.17
8.85
8.85
8.31
8.91
8.74
8.19
8.67
8.67
8.10
9.04
8.84
8.72
8.66
8.37
7.97
8.43
8.52
8.35
7.22
4.40
2.64
0.08
8.45
8.57
8.46
7.55
2.97
DO
%Sat
105.0
98.6
103.5
99.4
107.2
104.1
111.6
112.7
109.9
108.7
102.3
99.4
109.0
108.7
101.1
109.9
106.9
99.9
106.7
106.1
98.7
111.4
108.2
107.4
106.4
102.2
97.3
104.1
104.6
102.0
88.0
52.9
31.3
1.0
104.5
105.8
103.4
92.0
35.8
Cond
umho/cm
54
53
54
53
53
53
53
53
53
53
53
52
53
53
53
53
52
53
53
53
52
53
52
53
52
52
52
52
52
52
52
53
53
54
52
52
52
52
53
PH
std units
7.34
7.57
7.35
7.52
7.41
7.48
7.69
8.02
7.64
7.66
7.29
7.25
7.61
7.60
7.52
7.66
7.55
7.47
7.43
7.40
7.50
7.70
7.87
7.68
7.69
7.77
7.47
7.47
7.61
7.60
7.29
6.71
6.35
6.39
7.52
7.61
7.45
7.04
6.48
Secchi Depth
meters
3.8
3.8
3.8
•
3.5
3.8
A-8
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/17/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
Time
h m
1723
1731
1738
1740
630
637
644
655
657
700
706
714
722
730
733
736
Station
Location
#8 Right
#8 Mid
#8 Left
P.F. Dam
#1 Right
tflMid
#lLeft
#2 Right
#2 Mid
#2 Left
#3 Right
#3 Mid
#3 Left
#3A Right
#3 A Mid
#3 A Left
Depth
m
1.0
2.0
5.0
7.0
9.0
1.0
2.0
5.0
1.0
1.0
2.0
5.0
8.0
10.0
12.0
1.1
2.8
1.3
2.0
1.0
2.6
1.1
3.1
1.1
3.2
1.1
2.2
1.1
2.9
1.1
3.5
1.1
2.4
1.1
3.0
1.1
3.1
1.1
2.8
Temp
C
22.51
22.14
21.93
21.87
21.64
22.51
22.19
21.96
22.60
22.16
22.16
21.92
21.82
21.45
19.43
20.27
20.26
20.27
20.33
20.18
20.20
20.43
20.39
20.41
20.48
20.16
20.19
20.67
20.67
20.77
20.79
20.71
20.70
20.46
20.50
20.47
20.49
20.43
20.36
DO
mg/L
8.50
8.38
7.79
7.59
3.38
8.41
8.54
7.55
8.88
8.03
8.03
7.65
6.11
3.88
0.14
8.04
8.01
7.89
7.73
7.80
7.64
7.32
7.28
7.38
7.36
7.70
7.64
7.75
7.57
7.80
7.68
7.82
7.72
7.48
7.36
7.94
7.88
7.94
7.92
DO
%Sat
104.9
102.7
95.1
92.6
41.1
103.8
104.8
92.3
109.8
98.5
98.5
93.4
74.5
47.0
1.6
95.1
94.8
93.4
91.6
92.2
90.3
87.0
86.3
87.6
87.5
91.0
90.3
92.4
90.3
93.2
91.9
93.4
92.2
88.9
87.5
94.4
93.7
94.3
93.9
Cond
umho/cm
52
52
52
52
52
52
52
51
52
53
53
52
51
51
51
49
48
48
49
49
48
61
61
55
51
49
50
55
54
55
54
54
54
52
52
52
52
53
52
PH
std units
7.42
7.55
7.29
7.20
6.50
7.41
7.55
7.25
7.64
7.30
7.30
7.40
6.95
6.57
6.34
7.75
7.73
7.70
7.52
7.61
7.52
7.30
7.22
7.36
7.33
7.42
7.43
7.37
7.28
7.40
7.38
7.36
7.28
7.28
7.47
7.34
7.60
7.32
7.55
Secchi Depth
meters
•
A-9
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
Time
hm
742
752
758
805
809
814
822
828
834
840
848
900
Station
Location
#4 Right
#4 Mid
#4 Left
#4 A Right
#4 A Mid
#4ALeft
#5 Right
#5 Mid
#5 Left
#6 Right
#6 Mid
#6 Left
Depth
m
1.1
2.0
5.1
1.1
2.4
5.2
1.1
1.1
1.8
1.1
2.0
5.9
1.1
2.0
5.2
1.1
2.0
4.8
1.1
2.0
5.0
6.5
1.0
2.0
5.0
1.0
2.0
5.0
6.2
1.0
2.0
5.0
7.0
10.0
12.0
13.0
15.0
16.8
1.0
2.0
5.0
7.0
Temp
C
20.91
20.95
20.93
20.91
20.93
20.90
20.99
21.26
21.26
21.48
21.48
21.41
21.50
21.51
21.50
21.50
21.54
21.52
21.53
21.53
21.47
21.44
21.56
21.55
21.47
21.63
21.66
21.63
21.62
21.67
21.67
21.66
21.30
20.30
20.39
19.76
18.96
18.86
21.64
21.66
21.64
21.63
DO
mg/L
7.97
7.96
7.98
8.17
8.09
8.05
8.16
8.46
8.42
8.32
8.34
8.42
8.24
8.23
8.21
8.37
8.32
8.34
8.25
8.13
8.10
8.06
8.34
8.19
8.17
8.02
7.97
7.88
7.75
7.91
7.88
7.83
7.63
5.15
2.50
1.34
0.11
0.08
7.99
7.92
7.81
7.39
DO
%Sat
95.5
95.5
95.7
97.8
97.0
96.4
97.9
102.1
101.6
100.8
101.0
101.9
99.8
99.7
99.5
101.4
100.9
101.1
100.0
98.5
98.1
97.6
101.2
99.4
98.9
97.4
96.9
95.7
94.1
96.1
95.8
95.2
92.1
61.0
29.7
15.7
1.3
1.0
97.1
96.2
94.9
89.7
Cond
umho/cm
52
53
53
53
53
52
53
52
52
53
52
51
52
52
52
53
53
53
53
53
52
52
53
52
52
52
52
52
53
52
52
52
52
53
55
53
54
55
52
52
52
52
PH
std units
7.46
7.46
7.47
7.44
7.44
7.47
7.39
7.57
7.51
7.50
7.38
7.61
7.42
7.43
7.49
7.47
7.47
7.57
7.49
7.53
7.55
7.42
7.52
7.47
7.55
7.37
7.41
7.42
7.31
7.34
7.42
7.43
6.73
6.52
6.38
6.38
6.37
6.38
7.30
7.31
7.37
7.23
Secchi Depth
meters
3.9
4.0
'. 3.5
3.7
3.8
A-10
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18,1988.
Date
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
Time
hm
922
930
933
940
1448
1455
1458
1507
1510
1513
1521
1525
1531
1537
1540
1546
Station
Location
#8 Right
#8 Mid
#8 Left
P.P. Dam
#1 Right
tflMid
#lLeft
#2 Right
#2 Mid
#2 Left
#3 Right
#3 Mid
#3 Left
#3A Right
#3AMid
#3 A Left
Depth
m
1.0
2.0
5.0
7.0
8.7
1.0
2.0
4.4
1.0
1.0
2.0
5.0
7.0
10.0
1.0
2.7
1.0
1.9
1.0
2.6
1.0
2.0
1.0
2.8
1.0
2.2
1.0
2.7
1.0
3.3
1.0
1.5
1.0
3.3
1.0
3.0
1.0
2.8
Temp
C
21.53
21.59
21.56
21.57
21.56
21.69
21.68
21.60
21.63
21.70
21.71
21.64
21.63
21.56
21.03
20.84
20.91
20.89
20.88
20.75
21.08
20.73
20.80
20.66
20.92
20.77
21.11
21.07
21.07
21.04
21.12
21.15
21.10
20.86
21.10
20.91
21.14
20.92
DO
mg/L
7.41
7.31
7.52
6.96
7.16
7.68
7.65
8.05
8.16
7.34
7.28
7.19
7.22
6.28
8.07
8.11
7.96
7.96
8.08
8.05
7.93
7.87
7.87
7.97
8.03
7.99
7.91
8.04
7.84
7.92
8.42
8.47
7.55
7.64
8.00
8.26
8.26
8.75
DO
%Sat
89.8
88.8
91.2
84.5
86.8
93.4
93.0
97.8
99.1
89.3
88.5
87.4
87.7
76.1
97.0
97.0
95.4
95.4
96.8
96.1
95.4
94.0
94.1
95.1
96.2
95.5
95.1
96.6
94.2
95.2
101.2
102.0
90.8
91.4
96.2
99.0
99.4
104.9
Cond
umho/cm
51
52
51
51
51
52
51
51
52
51
52
52
52
53
49
49
49
49
49
49
53
52
50
51
50
51
54
53
53
53
53
53
52
53
53
53
54
53
pH
std units
7.13
7.12
7.25
7.11
7.16
7.24
7.27
7.41
7.51
7.10
7.12
7.18
7.22
6.80
7.43
7.77
7.53
7.59
7.50
7.56
7.27
7.43
7.27
7.59
7.50
7.59
7.34
7.50
7.23
7.57
7.42
7.54
7.12
7.22
7.16
7.38
7.39
7.85
Secchi Depth
meters
3.9
A-ll
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
Tune
hm
1553
1601
1606
1614
1617
1625
1634
1637
1645
1652
1659
1708
Staloc
#4 Right
#4 Mid
#4 Left
#4A Right
#4AMid
#4ALeft
#5 Right
#5 Mid
#5 Left
#6 Right
#6 Mid
#6 Left
Depth
m
1.0
2.0
5.0
1.0
2.0
5.0
1.0
1.0
2.0
1.0
2.0
5.0
7.0
1.0
2.0
5.0
6.2
1.0
4.2
1.0
2.0
5.0
7.0
1.0
2.0
1.0
2.0
5.0
6.1
1.0
2.0
5.0
7.0
10.0
13.4
1.0
2.0
5.0
7.0
10.0
Temp
C
21.56
21.41
20.82
21.53
21.45
20.80
21.46
22.03
21.80
21.96
21.80
21.48
21.47
22.06
21.99
21.51
21.50
21.92
21.62
22.20
21.85
21.58
21.51
22.31
22.10
22.03
21.99
21.75
21.70
22.25
22.25
21.96
21.70
21.38
19.93
22.32
22.30
21.88
21.71
21.69
DO
mg/L
8.54
8.47
7.99
8.40
8.39
8.00
8.56
8.92
8.94
8.76
8.76
8.34
8.24
8.77
8.71
7.82
7.84
8.87
8.33
8.56
8.56
8.24
8.01
8.55
8.87
8.47
8.44
7.99
7.79
8.28
8.27
8.14
7.83
5.18
1.38
8.24
8.21
8.13
7.80
7.68
%Sat
103.5
102.5
95.6
101.8
101.5
95.6
103.7
109.1
109.0
107.0
106.7
101.0
99.8
107.3
106.5
94.8
95.0
108.3
101.2
105.1
104.4
100.0
97.0
105.2
108.7
103.7
103.2
97.3
94.7
101.7
101.6
99.5
95.3
62.6
16.2
101.4
101.0
99.2
94.9
93.4
Cond
umho/cm
53
52
52
53
53
52
53
53
53
53
53
53
53
54
53
53
53
53
53
54
53
53
53
53
53
53
53
52
52
52
53
53
52
52
52
52
53
53
52
52
PH
std units
7.53
7.65
7.60
7.59
7.62
7.43
7.56
7.80
7.94
7.72
7.82
7.48
7.38
7.68
7.81
7.24
7.20
7.99
7.55
7.59
7.68
7.47
7.26
7.77
8.00
7.59
7.65
7.37
7.21
7.50
7.58
7.39
7.20
6.69
6.30
7.45
7.48
7.36
7.17
7.10
Secchi Depth
meters
3.9
3.4
3.7
3.7
A-12
-------
Table A-l. In-situ measurements of water quality in the Spokane River during the
field study of August 16-18, 1988.
Date
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
08/18/88
Time
hm
1724
1732
1736
1739
Station
Location
#8 Right
#8 Mid
#8 Left
P.F. Dam
Depth
m
1.0
2.0
5.0
7.0
8.5
1.0
2.0
5.0
1.0
1.0
2.0
5.0
7.0
10.0
12.5
Temp
C
22.14
21.88
21.73
21.68
21.64
22.29
22.18
21.74
22.32
22.03
21.91
21.81
21.74
21.51
19.43
DO
mg/L
7.96
8.12
7.56
7.23
7.16
7.80
7.85
7.40
8.11
7.78
8.10
7.87
7.43
4.72
0.11
DO
%Sat
97.6
99.1
92.0
87.9
86.9
95.9
96.3
90.0
99.8
95.2
98.9
95.9
90.5
57.2
1.3
Cond
umho/cm
53
52
52
52
52
52
53
52
52
53
53
52
52
52
51
pH
std units
7.34
7.42
7.15
7.03
6.97
7.22
7.26
7.04
7.43
7.20
7.38
7.28
7.09
6.58
6.25
Secchi Depth
meters
A-13
-------
Table A-2. Laboratory measurements of water quality for receiving
waters and point sources during August 16-18, 1988.
EPA
Lab#
340300
340301
340304
340307
340302
340303
340305
340306
340311
340316
340321
340312
340317
340322
340313
340318
340323
340314
340319
340324
340315
340320
340325
340326
BODS
mg/L
8.00
5.60
12.40
8.40
8.60
12.20
0.73
0.42
0.44
0.89
0.79
0.78
1.28
0.98
1.04
1.25
0.92
1.27
1.70
1.13
1.08
BOD10
mg/L
17.60
29.60
27.60
38.60
36.80
47.20
0.59
0.89
0.79
1.14
1.12
1.47
1.48
1.30
1.55
1.67
1.39
1.83
1.96
1.22
1.50
BOD15
mg/L
114.00
90.40
72.80
23.60
8.20
24.00
0.96
0.82
1.09
1.43
1.40
1.94
1.87
1.64
1.75
2.01
1.78
2.20
2.28
1.76
2.10
BOD20
mg/L
74.00
98.00
86.80
15.40
17.60
21.60
0.95
1.15
1.21
1.91
1.84
2.34
2.07
1.90
2.03
2.16
2.03
2.30
2.48
1.85
2.25
BOD60
mg/L
1.75
1.92
2.89
2.66
3.09
2.88
3.54
3.05
3.35
2.98
A-14
-------
Table A-2. Laboratory measurements of water quality for receiving
waters and point sources during August 16-18, 1988.
EPA
Lab#
340300
340301
340304
340307
340302
340303
340305
340306
340311
340316
340321
340312
340317
340322
340313
340318
340323
340314
340319
340324
340315
340320
340325
340326
NH3-N
Total
mg/1
0.01U
16.000
16.600
14.700
0.01U
0.055
0.055
0.058
0.01U
0.01U
0.01U
0.066
0.052
0.120
0.032
0.020
0.01U
0.01U
0.01U
0.01U
0.01U
0.01U
0.0 1U
0.0 1U
4O2NO3-r
Total
mg/1
0.01U
1.65
0.80
1.24
0.01U
25.00
26.00
25.50
0.01U
0.01U
0.01U
0.01
0.01M
0.01
0.0 1U
0.01U
0.01U
0.0 1U
0.01U
0.01U
0.0 1U
0.0 1U
0.01U
0.01U
Kjel-N
Total
mg/1
0.04U
22.50
23.00
21.50
0.04U
1.92
2.06
2.50
0.10
0.14
0.12
0.32
0.24
0.34
0.26
0.22
0.18
0.26
0.20
0.18
0.20
0.16
0.20
0.06
Phos
Total
mg/1
0.01U
7.000
7.200
6.800
0.0 1U
9.900
10.200
10.200
0.01 M
0.010
0.010
0.056
0.044
0.066
0.064
0.044
0.044
0.040
0.038
0.040
0.030
0.030
0.036
0.010
A-15
-------
Table A-2. Laboratory measurements of water quality for receiving
waters and point sources during August 16-18, 1988.
EPA
Lab#
340300
340301
340304
340307
340302
340303
340305
340306
340311
340316
340321
340312
340317
340322
340313
340318
340323
340314
340319
340324
340315
340320
340325
340326
Arsenic
As-Total
ug/1
0.6
1.4
1.8
1.4
0.5U
3.7
4.4
3.9
0.5U
0.5
0.5
0.6
0.5U
0.6
0.8
0.5
0.6
0.6
0.5
0.7
0.5U
0.7
0.5U
0.5U
Mercury
Hg-Total
ug/1
0.08U
0.17
0.08U
0.08U
0.08U
0.21
0.08U
0.08U
0.44
0.45
0.08U
0.25
0.13
0.08U
0.30
0.19
0.08U
0.17
0.37
0.08U
0.11
0.15
0.08U
0.08U
Cadmium
Tot-Rec
ug/1
0.1U
0.6
1.0
0.5
0.1U
0.2
2.0
0.2
0.7
0.4
0.6
0.7
0.4
0.4
0.3
0.3
0.3
0.3
0.3
1.3
0.2
0.3
0.2
0.1U
Chromiurr
Tot-Rec
ug/l
0.5U
3.3
3.1
4.0
0.7
1.3
0.9
0.9
0.5U
0.7
0.5U
1.2
1.7
0.5U
1.8
0.7
0.5U
0.5U
1.2
1.9
0.7
0.7
1.4
0.5U
Lead
Tot-Rec
ug/1
1U
5
7
4
1U
2
1
1
1
1
2
2
2
2
1
2
2
1
1
2
1
1
2
1U
Iron
Tot-Rec
ug/1
7U
253
216
7U
102
105
109
25
22
18
27
24
23
34
32
34
28
30
84
25
28
37
7U
Zinc
Tot-Rec
ug/1
5U
51
42
5U
43
38
40
75
63
67
'66
62
66
56
54
56
53
58
56
43
47
46
5U
A-16
-------
Table A-2. Laboratory measurements of water quality for receiving
waters and point sources during August 16-18, 1988.
EPA
Lab#
340300
340301
340304
340307
340302
340303
340305
340306
340311
340316
340321
340312
340317
340322
340313
340318
340323
340314
340319
340324
340315
340320
340325
340326
Cond@25C
Meter
umho/cm
1.5
672.0
674.0
677.0
1.7
538.0
538.0
538.0
53.8
53.8
52.8
57.6
57.0
58.3
57.5
57.8
56.2
56.9
56.2
56.6
56.0
55.3
55.2
1.8
pHLAB
Meter
Std Unts
4.40
6.74
6.72
6.74
4.20
6.80
6.80
6.74
6.25
5.95
5.97
6.30
6.22
6.17
6.37
6.27
6.20
6.35
6.25
6.30
6.35
6.34
6.39
4.28
Alk-Tot
CaCO3
mg/1
0.1U
193.0
202.0
196.0
0.6
60.4
62.0
60.0
18.7
19.0
19.2
19.3
19.3
20.1
19.6
19.9
20.5
20.2
20.6
19.9
19.8
19.5
19.5
1.5
Hard-Tot
CaCO3
mg/1
l.OU
103.0
110.0
l.OU
105.0
103.0
20.5
21.5
21.4
21.8
21.5
21.9
21.3
22.3
21.6
22.0
21.9
21.9
21.3
21.4
21.5
1.0
A-17
-------
Table A-3. Index for location of laboratory samples for receiving waters and point
sources during the field study of August 16-18,1988.
EPA
Lab#
340300
340301
340304
340307
340302
340303
340305
340306
340311
340316
340321
340312
340317
340322
340313
340318
340323
340314
340319
340324
340315
340320
340325
340326
Date
88/08/16
88/08/16
88/08/17
88/08/18
88/08/16
88/08/16
88/08/17
88/08/18
88/08/16
88/08/17
88/08/18
88/08/16
88/08/17
88/08/18
88/08/16
88/08/17
88/08/18
88/08/16
88/08/17
88/08/18
88/08/16
88/08/17
88/08/18
88/08/18
Time
0840
0845
0845
0940
0950
0955
0930
0835
0630
0630
0630
0740
0715
0710
0835
0800
0745
0920
0845
0820
1020
0945
0920
Description
Coeur d'Alene STP effl blank
Coeur d'Alene STP effl (G)
Coeur d'Alene STP effl (24)
Coeur d'Alene STP effl (24)
Hayden Lk STP effl blank
HaydenLk STP effl (G)
Hayden Lk STP effl (24)
HaydenLk STP effl (24)
Stal
Stal
Stal
Sta3
Sta3
Sta3
Sta4
Sta4
Sta4
Sta5
Sta5
Sta5
Sta8
Sta8
Sta8
Transfer Blank
River
mile
111.0
111.0
111.0
111.1
111.1
111.1
108:6
108.6
108.6
106.5
106.5
106.5
104.4
104.4
104.4
102.0
102.0
102.0
A-18
-------
APPENDIX B
Method for Estimating
Cross-Sectional Averages
of
Water Quality
To compute the mean values by station for dissolved oxygen (DO) concentration,
percent DO saturation, water temperature and conductivity, the receiving water data for
these parameters were aggregated using areal average techniques. The data were depth-
averaged for each section (right, middle, and and left) of each station.
Although DO, temperature, and conductivity were measured at increasing depths,
these specific depths were not identical across sections or stations. Therefore, a method
was sought that would produce estimates of parameter averages from the raw data. First,
the river bed at each section was assumed to be 0.5 meters below the greatest depth where
measurements were made (see Figs. B-l.l and B-1.2). Next, simple linear equations
(expressing parameter values as a function of water depth) were fit to each successive pair
of measurements. Parameter values were assumed to be constant in the intervals between
the surface and the first measurement and between the last measurement and the river bed
(Fig. B-1.3). Parameter averages were then computed from the areas under the resulting
line segments.
Assuming the section widths (right, middle, and left) were equal, the overall
average for the station was computed by summing all of the areas, then dividing by the
sum of the water depths. These data were further aggregated by summing over all the days
on which measurements were made to obtain a station average of each parameter for the
period of study. The results are presented as highly aggregated tranformations of the raw
data.
B-l
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APPENDIX C
Measurements obtained from the
Citizens' Volunteer Monitoring Program
The State of Idaho's Department of Environmental Quality, working in cooperation with
local volunteers, have implemented a sampling program in the Spokane River at three locations in
the Spokane River between Coeur d'Alene and Post Falls, Idaho. Data obtained from this
program is given in Tables C-l, C-2, and C-3.
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Table C-1. Water quality measurements in the Spokane River at the Cedars Site (approximate R.M. 111.1) obtained
in the Gtizen's Volunteer Monitoring Program supported by the State of Idaho's Department of
Environmental Quality.
CVMP1988
CEDARS SITE
DATE
TIME
MAXIMUM DEPTH (M)
SECCffl DEPTH (M)
TEMPERATURE (C)@ 1M DEPTH
TEMPERATURE (Q@ 1M OFF BOTTOM
DISSOLVED OXYGEN (MG/L)@ 1M
DISSOLVED OXYGEN (MG/L)@ 1M OF!
TOTAL AMMONIA (MG/L)
TOTAL NO2+NO3 (MG/L)
TOTAL KJELDAHL (MG/L)
TOTAL PHOSPHORUS (MG/L)
ORTHOPHOSPHORUS (MG/L)
SPECIFIC CONDUCTANCE (UMHOS)
CHLOROPHYLL a (UG/L)
ZINC (UG/L)
DEQDUPE
5/25/88
1100
2.75
2.75
13.3
12.2
12
12
0.013
0.014
0.11
0.011
52
90
6/27/88
1100
2.75
2.75
20
21
4
4
0.014
0.008
0.13
0.009
0.001
45
1.1
220
7/19/88
930
2.75
2.75
21
20
8
8
0.05
0.018
0.05
0.008
0.001
48
1.1
60
8/23/88
1000
2.6
2.6
20
20
7
8
0.007
0.02
0.09
0.009
0.002
51
1.7
30
9/27/88
1000
2.5
2.5
16
16
9
7
0.018
0.02
0.12
0.007
0.002
51
1
59
9/27/88
1000
2.5
2.5
16
16
9
7
0.021
0.016
0.11
0.008
0.002
53
1
10/18/88
1000
0.007
0.012
0.13
0.008
0.001
54
0.7
50
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Table C-2. Water quality measurements in the Spokane River at Harbor Island (approximate R.M. 106.5) obtained
in the Citizen's Volunteer Monitoring Program supported by the State of Idaho's Department of
Environmental Quality.
SPOKANE RIVER
CVMP 1988
HARBOR ISLAND
DATE
TIME
MAXIMUM DEPTH (M)
SECCHI DEPTH (M)
TEMPERATURE (C)@ 1M DEPTH
TEMPERATURE (C)@ 1M OFF BOTTOM
DISSOLVED OXYGEN (MG/L)@ 1M
DISSOLVED OXYGEN (MG/L)@ 1M OH
TOTAL AMMONIA (MG/L)
TOTAL NO2+NO3 (MG/L)
TOTAL KJELDAHL (MG/L)
TOTAL PHOSPHORUS (MG/L)
ORTHOPHOSPHORUS (MG/L)
SPECIFIC CONDUCTANCE (UMHOS)
CHLOROPHYLL a (UG/L)
ZINC (UG/L)
FECAL COLIFORM (#/100 ML)
DEQDUPE
5/25/88
1300
5.75
3.25
13.3
13.3
12
12
0.011
0.019
0.14
0.014
0.001
50
70
6/27/88
1200
5.75
3.75
20
21
9
9
0.027
0.017
0.13
0.017
0.007
46
1.6
140
7/19/88
1100
5.75
3.25
21
21
9
6
0.045
0.009
0.12
0.018
0.003
50
1.7
60
10
8/23/88
1030
5.8
2.75
21
21
4
8
0.026
0.027
0.19
0.037
0.022
55
6.5
30
9/27/88
1140
5.8
4.5
15
15
8
9
0.053
0.036
0.17
0.029
0.017
53
0.8
55
10
9/27/88
1140
5.8
4.5
15
15
8
9
0.045
0.027
0.14
0.027
0.018
53
1
10/18/88
1000
0.024
0.025
0.13
0.02
0.013
56
0.6
50
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Table C-3. Water quality measurements in the Spokane River at Post Falls Bridge (approximate R.M. 101.8) obtained
in the Citizen's Volunteer Monitoring Program supported by the State of Idaho's Department of
Environmental Quality.
SPOKANE RIVER
CVMP 1988
POST FALLS BRIDGE
DATE
TIME
MAXIMUM DEPTH (M)
SECCHI DEPTH (M)
TEMPERATURE (C)@ 1M DEPTH
TEMPERATURE (Q@ 1M OFF BOTTOM
DISSOLVED OXYGEN (MG/L)@ 1M
DISSOLVED OXYGEN (MG/L)@ 1M OF!
TOTAL AMMONIA (MG/L)
TOTAL NO2+NO3 (MG/L)
TOTAL KJELD AHL (MG/L)
TOTAL PHOSPHORUS (MG/L)
ORTHOPHOSPHORUS (MG/L)
SPECIFIC CONDUCTANCE (UMHOS)
CHLOROPHYLL a (UG/L)
ZINC (UG/L)
DEQDUPE
5/25/88
1430
9
3.25
14
13.4
13
13
0.013
0.017
0.14
0.014
0.001
80
70
6/27/88
1200
8.6
3.5
19.7
21
5
5
0.019
0.021
0.12
0.016
0.005
48
220
140
7/19/88
1030
8.5
2.75
22.5
21
9
9
0.028
0.003
0.13
0.017
0.002
50
60
60
8/23/88
1115
8.6
4.75
22
22
10
8
0.01
0.016
0.12
0.028
0.01
55
30
30
9/27/88
1240
8.5
4.75
15
15
8
8
0.035
0.033
0.16
0.027
0.017
54
52
55
9/27/88
1240
8.5
4.75
15
15
8
8
0.038
0.034
0.18
0.027
0.018
53
1
10/18/88
0.024
0.018
0.16
0.023
0.014
56
50
50
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