CEDAR RIVER
RASELINE
ECOLOGICAL
* '!» '
STUDY 1982

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DUANE ARNOLD ENERGY CENTER
CEDAR RIVER OPERATIONAL ECOLOGICAL STUDY
ANNUAL REPORT
January 1982 - December 1982
Submitted by
Donald B. McDonald
Iowa City, Iowa
May 1983

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TABLE OF CONTENTS
INTRODUCTION		1
SITE DESCRIPTION					2
OBJECTIVES				2
STUDY PLAN						3
OBSERVATIONS		6
Physical Conditions					6
Chemical Conditions..					8
ADDITIONAL STUDIES			12
Additional Chemical Determinations..*	'				12
Diurnal Variations				13
Benthic Organisms		..				14
Asiatic Clam Survey		15
Periphyton Studies						16
Fisheries Studies						17
Fish Basket Studies.......			17
Impingement and Entrairanent Studies		18
DISCUSSION AND CONCLUSIONS		19
REFERENCES								22
TABLES			24

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INTRODUCTION
This report presents the results of the physical, chemical and biological
studies of the Cedar River in the vicinity of the Duane Arnold Energy Center
during the nlaeth year of station operation (January 1982 - December 1982) as
required by Section 4.0 "Environmental Surveillance and Special Studies" of
the Nuclear Regulatory Commission's technical specifications.
The Duane Arnold Energy Center Operational Study was implemented in mid-
January 1974. Prior to plant start-up, extensive pre-operational data were
collected beginning in April 1971. These pre-operational studies provided a
substantial amount of "baseline" data with which to compare the information
collected since the station became operational. The availability of nine
years of operational data, collected under a variety of climatic and hydrological
conditions, provides an excellent basis for the assessment of the effects of
the operation of the Duatie Arnold Energy Center on the limnology and water quality
of the Cedar River. Equally important is the availability of sufficient data
to identify long-term trends in the water quality of the Cedar River which are
unrelated to station operation but are Indicative in changes in land use practices
or pollution control procedures within the Cedar River basin.

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SITE DESCRIPTION
The Duane Arnold Energy Center, a nuclear fueled electrical generating
plant, operated by the Iowa Electric Light and Power Company, is located on the
west side of the Cedar River, about 2\ miles north-northeast of Palo, Iowa in
Linn County. The plant employs a boiling water nuclear power reactor producing
about 550 MWe of power at full capacity. Waste heat rejected from the turbine
cycle to the condenser circulating water is removed by two closed loop'induced
draft cooling towers, which require a maximum of 11,000 gpm (about 24.5 cfs)
from the Cedar River. A maximum of 7,000 gpm (about 15.5 cfs) may be lost
through evaporation, while 4,000 gpm (about 9 cfs) will be returned to the river
as blowdown water from the cool side of the cooling towers.
OBJECTIVES
Studies to determine the baseline physical, chemical and biological char-
acteristics of the Cedar River near the Duane Arnold Energy Center prior to
plant start-up were Instituted in April of 1971. These pre-operational studies
are described in earlier reports.1»2>3 Data from-these studies served as a
basis for the development of the operational study. .
The operational studies were designed to identify and evaluate any signifi-
cant effects of chemical or thermal discharges from the generating station into
the Cedar River as well as the magnitude of impingement on intake screens or
entrainment in the condenser make-up water and were first implemented in
it,5,6,7,8,9,10,11
January 1974.
The specific objectives of the operational study are twofold:
1. To continue routine water quality determinations in the Cedar River
in order to identify any conditions which could result in environ-
mental or water quality problems.

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2. To conduct physical, chemical and biological studies in and adjacent
to the discharge canal and to compare the results with similar studies
above the intake. This will make it possible to determine any water
quality changes occurring as the result of chemical additions or
condenser passage and to identify any impact of the plant effluent on
aquatic communities adjacent to the discharge.
STUDY PLAN
During the operational phase of the study sampling sites have been estab-
lished in the discharge canal and at four locations in the Cedar River (Figure 1):
(1) upstream of the plant at the Lewis Access Bridge (Station 1); (2) directly
above the plant intake (Station 2); (3) at a point approximately 140 feet below
the plant discharge (Station 3); and (4) adjacent to Comp Farm, about % mile
below the plant (Station 4). Samples were also taken from the discharge canal
(Station 5).
Since January 1979 samples have been collected and analyzed by Ecological
Analysts, Inc. The conclusions contained in this annual report are based on
the results of theic analysis.
Samples for general chemical and physical analysis were taken twice per
month while complete chemical analysis, benthic and fishery studies were con-
ducted three times per year.
The following studies are discussed in this report:
I. General Water Quality Analysis
A.	Frequency: Twice per month
B.	Location: At all five sites
C.	Parameters measured:

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t
LEWIS BOTTOM ACCESS
^3 ; 34'—
LEWIS PRESERVE
PLEASANT CREEK RESERVOIR
DUANE ARNOLD
ENERGY CENTER
;aiLWICKIUP HILL^ |
* "CONSERVATION AREA
I	M
REFUGE
PALO MARSH WILDLIFE
i -x:
Figure 1. Location of Operational Sampling Sites

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1.	Temperature
2.	Turbidity
3.	Residues (total, filterable
soluble)
10.	Ammonia
11.	Nitrate
12.	Iron
13.	Tannins and Lignins
14.	Chemical Oxygen Demand
15.	Biochemical Oxygen Demand
9. Phosphate Series (total and
and nonfilterable)
4.	Dissolved Oxygen
5.	Carbon Dioxide
6.	Alkalinity (total and
carbonate)
7.	pH
8.	Hardness Series (total and
calcium)
II. Complete Water	Quality Analysis
A.	Frequency:	Spring, summer and fall
B.	Location:	At all five locations
C.	Parameters measured: All general water quality parameters plus:
III* Other Biological Studies
A.	Benthic (bottom organisms) studies
1.	Frequency: Spring, summer and fall
2.	Location: At all four river locations
B.	Asiatic Clam (Corblcula) Survey
C.	Periphyton
1.	Frequency: Spring, summer and fall
2.	Location: Upstream and downstream of station
D.	Fisheries
1.	Frequency: Spring, summer and fall
2.	Location: Upstream and downstream of station
E.	Fish Basket Studies
1.	Frequency: Summer
2.	Location: Upstream and downstream of station and discharge canal
F.	Impingement and Entrainment Studies
4.	Chromium (Cr*6)
5.	Copper
1.	Chloride
2.	Nitrite
3.	Sulfate
6.	Lead
7.	Manganese
8.	Mercury
9.	Zinc

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OBSERVATIONS
Physical Conditions
Hydrology (Table 1);
Flow in the Cedar River during the period January - December 1982 was far
above that of the previous year. Mean monthly discharges at the Cedar Rapids
gauging station ranged from 1,237 cfs in January to 14,440 cfs in March. Mean
flow for the year was ca. 7,250 cfs, the highest mean flow observed since 1973
and far greater than the 79 year average flow of 3,305 cfs. Discharges were
classified as excessive (greater than the 75% quartile) in all months except
January, April and August and were always in excess of the 1951-80 median monthly
discharges. Mean monthly discharges ranged from 118% of the 1951-80 monthly
median flow in January to 656% of the monthly median flow in December. High
spring flows resulting from snowmelt were observed during the latter half of
March 1982. A maximum spring flow of 31,700 cfs occurred on March 23. A low
flow for the year of 1,080 cfs occurred on February 16. High river flows
occurred in May, June, July and November and record monthly flows were reported
during the months of February, March, May, June and November. Hydrological
data are summarized in Table 1.
Temperature (Table 2):
River water temperatures during the period ranged from 0.0°C (32.0°F) to
28.1°C (82.6°F). Maximum temperatures were observed at all river stations on
July 26 and August 4. The highest discharge canal (Station 5) temperature
observed during the period, 30.5°C (86.9°F), was also recorded on August 4.
A maximum temperature differential (AT value) between the upstream river and
the discharge canal (Station 2 vs. Station 5) of 23.8°C (42.8°F) was observed
on March 23.

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Because of the high river flows present throughout most of the year,
station operation had little effect on downstream river temperature and virtually
no effect outside of the mixing zone. A maximum AT value between ambient
upstream temperature (Station 2) and the DAEC downstream station (Station 3)
located in the mixing zone for the discharge canal of 3.3°C (5.9°F) was measured
on December 1. Maximum observed temperature elevation at the Comp Farm Station
h mile below the plant (Station 2 vs. Station 4) was 0.6°C (1.1°F) on March 9.
This was the only temperature differential in excess of 0.5°C (0.9°F) observed
at this site on any of the twenty-four sampling dates.
A summary of water temperature differentials between upstream and downstream
locations is given in Table 3.
Turbidity (Table 4);
With the exception of the winter and late summer period, turbidity values
in excess of 20 NTU were observed in most river samples throughout the year. A
maximum river turbidity value of 324 NTU was observed in early June during a
period of increasing runoff. Minimum turbidity values of from 1 to 5 NTU were
observed in the river in January and early February. Turbidity values in the
discharge canal were usually higher than those observed in river samples but no
effects on downstream turbidity levels were apparent.
Residues (Tables 5-7);
Residue determinations included total, nonfilterable and filterable residues.
Total residue values in upstream river samples ranged from 310 to ca. 1,128 mg/L.
The highest value occurred during a high runoff period in early June. Relatively
high levels (ca. 500-700 mg/L) also occurred in October and November. Minimum
total residue values occurred in early August.

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Filterable residue values were generally somewhat lower than those observed
during 1981 due primarily to the high river flows and subsequent dilution effects.
Upstream values ranged from 180 mg/L during a period of snow melt and runoff
in February to 473 mg/L in December,. Downstream filterable residue values at
Station 3, 140 feet downstream of the discharge canal, were frequently higher
than upstream values observed above the discharge canal. A maximum downstream
value of 552 mg/L was observed at this location on August 17. Because of the
high river flows filterable residue values at Station 4, h mile below the plant,
were similar to upstream levels. Nonfilterable residue values in the river
ranged from 3 to 740 mg/L and generally paralleled turbidity levels.
Due to reconcentration in the blowdown, residue values in the discharge
canal were consistently higher than in the river samples during periods of
station operation. A maximum total residue concentration of 1,155 mg/L was
observed in the discharge canal in July while a minimum value of 415 mg/L was
observed in early April.
Chemical Conditions
Dissolved Oxygen (Table 8):
Dissolved oxygen concentrations in the river ranged from 7.2 to 21.3
(91 to 260% saturation) during the period. Lowest concentrations were observed
in July when maximum river temperatures were present. The highest dissolved
oxygen concentrations appeared to be the result of photosynthetic activity but
high values (ca. 10.5-13.5 mg/L) also occurred during the late fall to early
spring periods when water temperatures were low and the solubility of the gas
is increased. Dissolved oxygen concentrations in the discharge canal (Station 5)
were consistently lower than those observed in the river, ranging from 6.4 to
13.9 mg/L. These lower values appeared to be due primarily to the reduced

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solubility of oxygen at higher temperatures and turbulence which maintained
oxygen concentrations at near saturation levels.
Carbon Dioxide (Table 9):
With the exception of a few samples taken in August and October, free
carbon dioxide was present in all samples taken during 1982. A maximum con-
centration of 36 mg/L occurred in early February. Low values of <2 mg/L occurred
in July, August and early October.
Alkalinity. pH, Hardness (Tables 10-14):
These interrelated factors were influenced by both climatic and biological
conditions. Highest total alkalinity values in the river (ca. 235-255 mg/L)
occurred during January and December, while lowest values (ca. 70-80 mg/L)
occurred at the beginning of a period of snowmelt in February. Low values also
occurred during a high flow period in March.
With the exception of a few scattered samples taken in July, August and
October, all carbonate alkalinity values were below 1 mg/L in samples throughout
¦the year. Values for pH in river samples ranged from 7.0 in February to 8.5
in August and October with the high levels coinciding with periods of increased
photosynthetic activity. In the discharge canal pH values ranged from 6.9-8.7.
Hardness values generally parallelled total alkalinity levels with highest
values occurring in January and December and low values in February and March.
Phosphates (Tables 15 and 16);
Total phosphate concentrations in river samples were lower and exhibited
less variation than during 1981. Values ranged from <0.2 mg/L in December to
1.85 mg/L at the beginning of a period of increasing flow in February.
Orthophosphate concentrations in river samples were also relatively high
ranging from <0.01 mg/L in May and December to maximum values of 1.82 mg/L in

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February. As in previous years, reduced orthophosphate concentrations occurred
in conjunction with large plankton populations as a result of uptake by algae.
Phosphate values in the discharge canal were frequently higher than in
the river. A maximum total phosphate concentration of 2.99 mg/L was observed
in the discharge canal on February 23.
Ammonia and Nitrate Nitrogen (Tables 17 and 18);
Ammonia nitrogen concentrations in the river ranged from <0.01 to 0.95 mg/L.
Highest concentrations accompanied snowmelt in late February and high flows in
March while low values occurred during periods of relatively low flow in
September.
The trend in increasing nitrate nitrogen concentrations continued during
the current year. The highest maximum and average nitrate concentrations in
river samples observed during the course of the DAEC study were recorded during
1982. Values in river samples ranged from ca. 3.2 mg/L in early March to 15.7
mg/L in February. The average nitrate nitrogen concentration at Station 2
upstream of DAEC was 7.9 mg/L and 22% of river samples exhibited concentrations
in excess of the EPA drinking water standards of 10 mg/L.12 Concentrations
in excess of 10 mg/L were observed in January, February, April, May,
Ju ne, September, October and December, As in previous years, these high
values appear to be related to input from agricultural land and were not related
to station operation. Similar increases have been observed in the Iowa River in
recent years.13 Nitrate concentrations were frequently higher in the discharge
canal than in river samples due to reconcentration in the blowdown. A maximum
nitrate nitrogen concentration of ca. 22 mg/L was observed in the discharge
canal on February 9.

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Iron (Table 19) :
Iron concentrations in the river continued to be high during 1982 ranging
from 0.02 to 11.4 mg/L. Highest concentrations occurred in early June and
values in excess of 4 mg/L were also observed in February, March, July and
November. Low values occurred in early August. High iron concentrations were
usually observed in association with high turbidity values indicating that most
of the iron present was in the suspended form rather than in solution. Iron
levels were frequently higher in the discharge canal than in the river samples.
A maximum iron concentration of 16.4 mg/L was observed in the discharge canal
on July 26.
Lignins and Tannins (Table 20):
Concentrations of these substances which are derived primarily from decaying
plant material were extremely high during the current year ranging from 0.07
to 10.4 mg/L in river samples. Minimum values were generally observed during
low flow periods. Extremely high concentrations ranging from 6.6 to 10.4 mg/L
occurred at all locations in early November.
Chemical Oxygen Demand (Table 21):
Chemical oxygen demand (COD) values in the river exhibited considerable
random fluctuation ranging from <10 to 111 mg/L. Minimum values occurred in
early December. Values in excess of 100 mg/L occurred in July and September.
Biochemical Oxygen Demand (Table 22):
Five-day biochemical oxygen demand (BOD5) values in the river ranged from
<1 to 14.1 mg/L. Maximum BOD values occurred in February and August. The
high February levels appeared to be the result of runoff while the high August
values coincided with large algal populations. Minimum values occurred in

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March, April and December following extended periods of high flow
which flushed the readily available organic material from the surface of the
drainage basin.
ADDITIONAL STUDIES
In addition to the routine monthly studies, a number of seasonal limno-
logical and water quality investigations were conducted during the spring,
summer and fall periods. The studies discussed here include additional chemical
determinations, diurnal chemical analysis, zooplankton, benthic, periphyton
and fisheries studies as well as surveys designed to detect the presence of
the Asiatic Clam Corblcula in the vicinity of the station.
Additional Chemical Determinations
Samples for chloride, nitrite, sulfate and heavy metal analysis were
collected at all sampling stations in May, August and November. Generally, the
nonmetallic constituents generally exhibited little variation seasonally or
between the river stations. Concentrations usually fell within the expected
ranges and were similar to those observed in 1981. Chloride concentrations in
the river ranged from ca. 17 to 29 mg/L while nitrite concentrations remained
low ranging from 0.02 to 0.08 mg/L indicating little evidence of recent munici-
pal wastewater pollution. Sulfate values in the upstream river ranged from
ca. 26 to 42 mg/L. A higher value (178 mg/L) occurred in the mixing zone
(Station 3) on August 17 when river flow was relatively low but no increase
was observed during May or November when flows were high.
Heavy metal concentrations continued to exhibit a good deal of spacial
and temporal variation during the 1982 study. Although most values were within
the expected ranges and similar to those of prior years, two copper values in
lit
excess of the Iowa Water Quality Standard (20 yg/L) were observed at river

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locations upstream and downstream of the discharge in the May and August
samples.. The highest copper value (28.9 yg/L) was observed at Station 4,
H mile downstream of the plant, on May 26. This value was well below the
extremely high river copper value of 153 yg/L observed at Station 4 in
November 1981. Since several samples taken during the routine quarterly
monitoring program contained copper concentrations in excess of the 20 yg/L
standard, additional samples for copper analysis were taken from the Cedar
River and the discharge canal from August to December 1982 in order to
attempt to determine the source and significance of these high values.
These studies indicate that although copper values in river samples exhibit
considerable temporal and spacial fluctuation, values were not consistently
higher immediately downstream of the station as would be expected if increased
copper concentrations were resulting from input from the discharge canal.
Of the 45 river samples analyzed between May 1981 and December 1982, five
contained copper concentrations in excess of 20 yg/L but three of these
samples were taken upstream of the station and only a single, and suspect,
sample exhibited copper concentrations in excess of 30 yg/L, well below
levels that would be toxic.to the indigenous Cedar River biota.
No other metal values were in excess of the water quality standards.
Mercury concentrations were always below the limit of detection (0.2 yg/L)
and the high chromium values present in November 1981 were not observed
during the current year. The results of the quarterly chemical determinations
are given in Table 23.
Diurnal Variations
The diurnal studies of dissolved oxygen, carbpn dioxide, alkalinity, pH
and water temperatures which were conducted on June 8—9, August 18—19 and
November 17-18, 1982, are summarized in Table 24. The results of the spring and
fall studies reflect the effect of high river flows. Oxygen concentrations and

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pH levels in the river exhibited little diurnal variation in either the June or
November studies. A may-lmmn observed diurnal variation in dissolved oxygen in
the river of 0.4 mg/L was recorded during the June 1982 study as compared to
10.7 mg/L during August when river flow was substantially lower. During August,
as in previous summer studies, highest oxygen values occurred during the late
afternoon while tiWirtmnm concentrations were observed in the early morning hours.
A maximum dissolved oxygen concentration of 19.9 mg/L (245% saturation) was
observed at the upstream DAEC site in the August study while a minimum value of
7.8 mg/L (83% saturation) occurred at the Lewis Access site during the June
study.
Values for pH in river samples ranged from 7.6 in November to 8.8 in August.
As expected the greatest diurnal variation in pH was also observed during the
August studies.
Benthic Organisms
Bottom samples were taken at the river sampling locations in May, August
and November by means of a Ponar dredge. A total of 25 taxa were collected.
Dredge samples were dominated by free living flat worms and chironomid (midge)
larvae which accounted for 67 and 29%, respectively, of the benthic biota
collected. A few aquatic earthworms, caddis fly larvae and clams were also
collected where suitable substrate was available. Although seasonal changes
and variations in both species composition and numbers were observed between
stations, no consistent differences were observed which appear to be related
to station operation. The results are compatible with earlier studies which
indicate that variation in bottom substrate is the major factor influencing
species composition and that the shifting sand and silt bottom is the primary
cause of the limited diversity of the benthic community. The results of the
Ponar dredge samples are summarized in Table 25.

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Artificial substrate samples, collected In May, August and November, were
characterized by a different community structure and greater species diversity
than the natural substrate (Ponar dredge) samples (Table 26). A total of 50
taxa were identified. The May substrates contained the smallest numbers and
exhibited the lowest variety of forms with the number of species present
ranging from 14 directly upstream of the station (Station 2) to 8 at Station 1,
at Lewis Access. Caddis fly larvae were the dominant organisms in all samples.
The August and November artificial substrates supported somewhat larger,
more diverse populations which were also dominated by caddis fly larvae and
mayfly nymphs. Diversity was similiar at all locations during the August and
November periods. The differences in the May samples and those collected
later in the year appeared to be the result of seasonal and hydrological changes
and were not related to station operation. As in previous years the artificial
substrate studies indicate that the Cedar River both upstream and downstream of
the Duane Arnold Energy Center is capable of supporting a relatively diverse
macroinvertebrate fauna in those limited areas where suitable bottom habitat is
available. The results of the artificial substrate determinations are given in
Table 27.
Asiatic Clam Survey
In recent years several power generation facilities have experienced problems
with blockage of cooling water intake systems by large numbers of Asiatic Clams
(Corbicula sp.). This clam is common to portions of the Iowa reach of the
Mississippi River where suitable substrate :is available. This organism requires
relatively stable substrate and is normally absent from areas with a shifting
sand/silt substrate such as commonly found in the Cedar River in the vicinity
of the DAEC. Corbicula has not been collected from the Cedar River in the
vicinity of the DAEC during the routine Cedar River monitoring program which

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was implemented in April 1971. A single Corbicula was, however, collected in
January of 1979 in the vicinity of Lewis Access upstream of DAEC by Hazelton
personnel. Because Corbicula had been collected on one occasion from the
Cedar River and is commonly found in power plant intakes on the Mississippi,
studies were implemented at the Duane Arnold Energy Center in 1981 in order to
determine if the organism had established itself within the system. These
studies were continued during May and November 1982. During each survey three
Ponar dredge samples were taken along a transect in each of the two intake
bays and between the bar rack and the traveling screens. The substrate in this
area was found to consist of shifting sand and silt and contained no Corbicula.
A mussel rake was used to sample for Corbicula in the discharge canal and in
the river adjacent to the station but no Corbicula were collected in spite of
the fact that fairly stable silty sand substrate capable of supporting the
organism was present in these areas.
Periphyton Studies
Periphyton determinations were conducted during May, August and December
utilizing artificial substrates placed above and below the plant site (Stations
2 and 3, respectively). Major species and biomass determinations are given
in Tables 28 and 29.
Diatoms* chiefly Achnanthes, Cyc3otella, Gomphonema» Navicula and Nltzschia,
were the dominant organisms through the period comprising from 78 to over 99%
of the total periphyton. Highest densities occurred at both upstream and down-
stream locations in August. The blue green algae Lyngbya was common only during
the May sampling period when it accounted for ca. 8% of the organisms present.
Green algae accounted for less than 2% of the total periphyton. As in previous
years, differences in species composition and diversity between locations were
relatively minor but the total number or organisms was always greater at the

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downstream location. Biomass values were always slightly higher at the up-
stream location, however.
Fisheries Studies
Fisheries studies were conducted in May, August and November. Fish were
collected upstream at Lewis Access (Location 1) and at the DAEC site by electro-
shocking, seining and baited hoop nets. Although diversity was similar to prior
years, total numbers collected were substantially lower due likely to the high
flows present during 1982. A total of 370 fish comprising 26 species were
collected during the period. The spotfin shiner continued to be the dominant
form collected comprising 47% of the total catch. River carpsucker and carp
were also common, together accounting for 27 and 7%, respectively, of the catch.
Gamefish such as catfish, sunfish, crappie, bass and pike accounted for about
6% of fish collected. The total numbers of fish collected were lowest during
the May sampling period due likely to the high river flows but in general there
appeared to be little variation in species composition among the sampling periods.
No major differences in size or composition of populations between the upstream
and DAEC site location were apparent. A tabulation of fish collected is given
in Table 30.
Fish Basket Studies
Live basket studies to determine the effects of blowdown discharge from
the Duane Arnold Energy Center on channel catfish were conducted over a 48 hour
period from August 17-19. Ten fish were placed in each of three live boxes
located in the river immediately above the center (Station 2), immediately below
the discharge canal (Station 3), and in the discharge canal (Station 5). The
boxes were checked at six-hour intervals to determine fish condition and water
temperature. No fish mortality was observed in any of the live boxes during the
48-hour period. Diel temperature changes and temperature differences between

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stations were minor. A maximum temperature differential of 2.3°C (4.1°F) was
observed between the upstream river station and the discharge canal at the
end of the 48-hour period.
Impingement and Entrainment Studies
As in previous years the total number of fish impinged on the intake
screens at the Duane Arnold Energy Center remained very low. Daily counts
conducted by DAEC station personel indicates that a total of only 208 fish
were impinged during 1982. Highest impingement rates continued to occur during
the winter period. Only 34 impinged fish were removed from the trash baskets
from April through October. The results of the daily trash basket counts are
given in Table 31.
Entrainment studies were conducted during February, May, August and
November. Only two fish larvae were collected during the quarterly sampling
program. With the exception of the February samples, the zooplankton populations
collected at the intake generally exhibited somewhat higher densities than those
observed in 1981 but species composition and diversity were typical of that
normally observed in mid-western rivers. Rotifers continued to be the dominant
organism in all samples accounting for over 87% of all zooplankton. Highest zoo-
3
plankton densities occurred in Hay (ca. 26,000 organisms/M ) while lowest densities
occurred in February (ca. 6,700 organisms/M^). The results of the zooplankton
studies are summarized in Table 32.

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DISCUSSION AND CONCLUSIONS
The effects of the extremely high river flows present in 1982 were evident
during the current studies. During 1982 the mean discharge in the Cedar River,
as measured at the Cedar Rapids gauging station was 7,252 cfs, over twice the
mean flow present during 1981. As a result the effects of station operation
on the downstream river were insignificant.
During the current year, the average temperature elevation at Station 3,
located in the mixing zone, was only 0.6°C (1.1°F) above that of the upstream
DAEC location (Station 2). The maximum observed temperature differentials
between Stations 2 and 3 occurred during the winter months and never exceeded
3.3°C (5.9°F). Observed temperature differentials at the Comp Farm location
one-half mile below the station were even lower averaging only 0.1°C (0.2°F)
and never exceeding 0.6°C (1.1°F).
Although reconcentration of solids in the blowdown consistently resulted
in increased levels of many parameters in the discharge canal, effects on the
downstream river were minimal. Only residues, hardness, chemical oxygen demand,
sulfates and several heavy metals were routinely higher downstream of the dis-
charge (Stations 3 and A) than at upstream locations. Nitrate concentrations
13
in excess of the Iowa Water Quality Standard were observed in 18 of the 96
river samples taken during the year and copper values in two samples violated
the standard in May and August but these violations were not related to station
operation since the high values were observed at both upstream and downstream
locations. Maximum, minimum and mean values for the water quality data
collected at all five locations during 1982 are given in Table 33.
The effects of the high river flows on the biota of the Cedar River was
evident during the quarterly biological studies. These effects were most

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pronounced during the May studies when reduced kinds and numbers of macro-
invertebrates and the smallest periphyton populations were collected from the
artificial substrates. Fish collections generally yielded fewer fish than
during previous years but diversity and species composition were similar to
those observed in earlier studies. Game fish accounted for 6% of the total
catch in 1982 as compared to 4%, 3% and 8% of the catch in 1979, 1980 and
1981, respectively.
Analysis of the biological data collected during the current year continue
to support the conclusion that station operation has had no appreciable impact
on the ecology of the Cedar River. As in earlier years the only biological
parameter that consistently exhibited an effect of station operation was
periphyton. Artifical substrates located in the mixing zone (Station 3) supported
larger periphytic populations than the upstream substrates (Station 2) during
the spring, summer and fall studies. These findings do not, however, indicate
any adverse impact of station operation on the river ecology.
Although seasonal and yearly variations in other biological parameters
were observed no consistent differences between upstream and downstream locations
were apparent during the 1982 study period. As previously stated, fishery
studies conducted during 1982 yielded fewer fish than collected during the 1979
to 1981 period but no major differences in the kinds or numbers of fish collected
at upstream and downstream locations were observed.
The results of the 1982 studies continue to be consistent with prior
observations and support the conclusion that the limnology and water quality of
the Cedar River is influenced to a far greater extent by agricultural activities
in the drainage basin than by municipal or industrial discharges. As in previous
years, maximum turbidity, non-filterable residue, phosphate, lignin and tannin,
COD, and BOD values were frequently observed at the beginning of runoff periods

-------
-21-
while low levels occurred during low flow periods or following extended periods
of runoff which flushed much of the readily available material from the land
surface.
Because of the magnitude of the impact of agricultural land runoff on the
Cedar River, modifications of agricultural practices have resulted in a number
of long-term trends and changes in water quality which are apparent when the
11^5 years of data collected since the inception of the Duane Arnold Energy
Center study are analyzed. It is evident from Table 34 which presents average
yearly values for turbidity, phosphate, ammonia, nitrate and BOD for the period
1972-1982 that average concentrations of phosphate and to a lesser extent
ammonia, were higher and nitrate values far lower during the earlier years of
the study. This is especially true when years with similar mean river flows
are compared, i.e. 1972 to 1980 and 1973 to 1982. A similar pattern is apparent
in the actual quantities of materials transported by the river as is illustrated
in Table 35 which presents relative loading values calculated by multiplying
the average annual concentrations of the various parameters by the cumulative
runoff for each year of the study. The decreased levels of phosphate and
ammonia, substances which usually enter the river adsorbed onto soil particles,
are probably related to increased use of minimum tillage while the high nitrate
levels are the result of increased applications of nitrogenous fertilizers.
The fact that nitrates, in contrast to phosphates, are- highly soluble facili-
tates their transport into the river by both surface and subsurface runoff.

-------
-22-
REFERENCES CITED
1.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Report, April
1971-April	1972. Duane Arnold Energy Center." Report prepared for Iowa
Electric Light and Power Company by the University of Iowa, 1972.
2.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Report, May
1972-April	1973. Duane Arnold Energy Center." Report prepared for Iowa
Electric Light and Power Company by the University of Iowa, 1974.
3.	McDonald, D.B., "Cedar River Baseline Ecological Study Final Pre-Operational
Report, May 1973-January 1974." Report prepared for Iowa Electric Light and
Power Company by the University of Iowa^ 1974.
4.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Operational
Report, January 1974-January 1975. Duane Arnold Energy Center." Report
prepared for Iowa Electric Light and Power Company by the University of
Iowa, 1975.
5.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Report, January
1975-January	1976. Duane Arnold Energy Center." Report prepared for Iowa
Electric Light and Power Company by the University of Iowa, 1976.
6.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Report, January
1976-December	1976. Duane Arnold Energy Center." Report prepared for Iowa
Electric Light and Power Company by the University of Iowa, 1977.
7.	McDonald, D.B., "Cedar River Baseline Ecological Study Annual Report,
January 1977-December 1977. Duane Arnold Energy Center." Report prepared
for Iowa Electric Light and Power Company by the University of Iowa, 1978.
8.	McDonald, D.B., "Duane Arnold Energy Center Cedar River Operational Ecological
Study Annual Report," January 1978-December 1978. In: Reports of Environ-
mental Monitoring Program, January 1978-December 1978, Iowa Electric Light
and Power Company, 1979.
9.	McDonald, D.B., "Duane Arnold Energy Center Cedar River Operational Ecological
Study Annual Report, January 1979-December 1979." Report prepared for Iowa
Electric Light and Power Company by D.B. McDonald Research, Inc., Iowa City,
May 1980.
10.	McDonald, D.B., "Duane Arnold Energy Center Cedar River Operational Study
Annual Report, January 1980-December 1980." Report prepared for Iowa
Electric Light and Power Company by D.B. McDonald Research, Inc., June 1981.
11.	McDonald, D.B., "Duane Arnold Energy Center Cedar River Operational Study
Annual Report, January 1981-December 1981." Report prepared for Iowa
Electric Light and Power Company, May 1982.

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-23-
12.	National Interim Primary Drinking Water Standards. Federal Register.
U.S. Environmental Protection Agency, Vol. 40, No. 248 (Dec. 24, 1975).
13.	McDonald, D.B., "Summary of the Limnology and Trends in Water Quality of
the Coralville Reservoir and Iowa River During the 1980 Water Year," In:
Water Quality in the Corps of Engineers Reaervoirs in Iowa, Proceedings
of the March 1981 Seminar.
14.	State of Iowa, "Water Quality Standards," Chapter 16, 400 Iowa Administrative
Code. State of Iowa, Des Moines, Iowa. March 1978.

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-24-
TABLE 1
SUMMARY OF HYDROLOGICAL CONDITIONS
CEDAR RIVER AT CEDAR BAPIDS*
Date
1982
Mean Monthly
Discharge (cfs)
Percent of
1951-1980
Median Discharge
January
1,237
118
February
2,850
234
March
14,440
272
April
9,735
167 -
May
12,123
284
June
11,221
264
July
7,515
229
Augus t
2,689
133
September
3,477
195
October
4,906
328
November
8,865
480
December
8,231
656
*Data obtained from U.S. Geological Survey records

-------
-25-
TABLE 2
TEMPERATURE (°C) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
0.0
0.0
22.2
0.1
0.0
Jan 27
0.0
0.0
22.2
0.1
0.0
Feb 09
0.0
0.0
22.4
0.0
0.0
Feb 23
0.0
0.1
21.5
1.1
0.2
Mar 09
0.0
0.0
1'9.8
1.4
0.6
Mar 23
2.2
2.6
26.4
2.9
2.6
Apr 07
2.2
2.4
5.6
2.4
2.4
Apr 20
10.2
10.1
10.1
10.1
10.1
May 04
19.2
19.1
27.9
19.3
19.2
May 26
14.4
14.4
24.2
14.8
14.5
Jun 08
18.8
18.9
20.4
19.0
18.9
Jun 23
21.7
21.3
20.2
21.0
21.6
Jul 06
24.5
24.4
24.4
24.4
24.4
Jul 26
27.3
27.6
28.3
28.1
27.7
Aug 04
27.9
27.3
30.5
28.1
27.4
Aug 17
26.2
25.7
26.8
26.0
25.4
Sep 08
19.9
19.9
26.8
22.2
20.1
Sep 22
15.6
16.0
16.0
16.0
16.0
Oct 04
17.8
18.2
24.7
19.7
18.3
Oct 19
13.1
13.1
13.2
13.2
13.1
Nov 02
11.4
11.6
23.4
12.8
11.6
Nov 17
1.6
1.6
22.4
2.0
1.8
Dec 01
4.6
4.3
26.9
7.6
4.4
Dec 14
0.1
0.0
0.3
0.1
0.0

-------
26-
TABLE 3
SUMMARY OF WATER TEMPERATURE DIFFERENTIALS AND STATION
OUTPUT DURING PERIODS OF CEDAR RIVER SAMPLING - 1982
Average
Date AT( C)U/S River (St.2)AT( C)U/S River (St,2)AT(°C)U/S River (St,2) Station Output
1982 vs. Dia.Canal(St.5) vs. D/S River (St.3) vs. D/S River (St.4) (% full power)
Jan 14
22.2
0.1
0.0
84
Jan 27
22.2
0.1
0.0
94
Feb 09
22.4
0.0
0.0
95
Feb 23
21.4
1.0
0.1
94
Mar 09
19.8
1.4
0.6
93
Mar 23
23.8
0.3
0.0
91
Apr 07
3.2
0.0
0.0
0
Apr 20
0.0
0.0
0.0
47
May 04
8.8
0.3
0.1
81
May 26
9.8
0.4
0.1
86
Jun 08
1.5
0.1
0.0
0
Jun 23
-1.1
-0.3
0.3
0
Jul 06
0.0
0.0
0.0
0
Jul 26
0.7
0.5
0.1
33
Aug 04
3.2
0.8
0.1
86
Aug 17
1.1
0.3
-0.3
35
Sep 08
6.9
2.3
0.2
53
Sep 22
0.0
0.0
0.0
34
Oct 04
6.5
1.5
0.1
35
Oct 19
0.1
0.1
0.0
35
Nov 02
11.8
1.2
0.1
83
Nov 17
20.8
0.4
0.2
31
Dec 01
22.6
3.3
0.1
82
Dec 14
0.2
0.1
0.0
90

-------
-27-
TABLE 4
TURBIDITY (N.T.U.) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
2.3
2.7
6.9
3.5
3.3
Jan 27
2.8
4.2
6.5
2.5
3.7
Feb 09
1.7
1.5
6.3
1.8
1.4
Feb 23
117.0
120.0
161.0
119.0
127.0
Mar 09
5.2
7.7
12.8
7.4
7.6
Mar 23
59.0
77.0
176.0
82.0
62.0
Apr 07
48.0
46.0
42.0
52.0
46.0
Apr 20
26.0
25.0
27.0
25.0
25.0
May 04
21.0
21.0
31.0
20.0
23.0
May 26
35.0
32.0
64.0
35.0
40.0
Jun 08
309.0
324.0
182.0
294.0
257.0
Jun 23
38.0
37.0
40.0
36.0
40.0
Jul 06
32.0
35.0
32.0
31.0
34.0
Jul 26
39.0
48.0
359.0
109.0
48.0
Aug 04
21.0
29.0
27.0
28.0
26.0
Aug 17
16.0
19.0
15.0
15.0
17.0
Sep 08
22.0
20.0
43.0
29.0
18.0
Sep 22
21.0
25.0
25.0
25.0
25.0
Oct 04
35.0
30.0
29.0
29.0
19.0
Oct 19
16.0
15.0
16.0
17.0
15.0
Nov 02
102.0
171.0
183.0
196.0
183.0
Nov 17
37.0
37.0
60.0
38.0
37.0
Dec 01
10.0
11.0
20.0
12.0
11.0
Dec 14
19.0
17.0
20.0
20.0
19.0

-------
-28-
TABLE 5
TOTAL RESIDUE (mg/L) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plaht
1982
1
2
5
3
4
Jan 14
370
368
743
354
422
Jan 27
420
472
1,076
455
427
Feb 09
402
393
850
417
388
Feb 23
436
434
836
464
419
Mar 09
446
441
719
474
464
Mar 23
458
311
900
322
337
Apr 07
527
504
415
491
469
Apr 20
395
529
514
461
462
May 04
413
429
1,010
446
439
May 26
LA
463
1,023
470
456
Jun 08
1,128
1,044
726
1,044
1,034
Jun 23
547
523
534
507
532
Jul 06
538
516
536
539
515
Jul 26
574
552
1,155
802
710
Aug 04
319
310
911
563
430
Aug 17
392
373
1,032
619
369
Sep 08
477
465
881
629
462
Sep 22
410
381
420
391
397
Oct 04
567
493
740
493
469
Oct 19
508
481
488
477
485
Nov 02
618
728
1,090
783
750
Nov 17
443
414
619
403
430
Dec 01
457
438
1,008
490
482
Dec 14
505
470
489
476
487
LA » Lab Accident

-------
-29-
TABLE 6
FILTERABLE RESIDUE (mg/L) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
345
311
683
328
366
Jan 27
403
460
1,051
442
412
Feb 09
388
390
826
398
375
Feb 23
180
187
591
215
185
Mar 09
428
420
694
452
443
Mar 23
386
231
572
246
222
Apr 07
442
430
338
403
381
Apr 20
308
445
430
382
384
May 04
335
346
929
366
356
May 26
LA
394
909
410
389
Jun 08
388
346
422
370
374
Jun 23
419
407
434
402
412
Jul 06
420
409
445
436
419
Jul 26
444
430
600
489
590
Aug 04
233
223
845
495
348
Aug 17
300
297
994
552
293
Sep 08
417
404
765
535
404
Sep 22
362
329
370
330
344
Oct 04
445
401
660
419
399
Oct 19
464
442
438
436
443
Nov 02
350
311
715
363
353
Nov 17
392
375
486
359
389
Dec 01
432
413
958
468
458
Dec 14
473
447
458
445
472
LA - Lab Accident

-------
-30-
TABLE 7
NONFILTRABLE RESIDUE (mg/L) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
H Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
25
47
60
26
56
Jan 27
17
12
25
13
15
Feb 09
14
3
24
19
13
Feb 23
256
247
245
249
234
Mar 09
18
21
25
22
21
Mar 23
72
80
328
76
115
Apr 07
85
74
77
88
88
Apr 20
87
84
84
79
78
May 04
78
83
82
80
83
May 26
LA
69
114
60
67
Jun 08
740
698
304
674
660
Jun 23
128
116
100
105
120
Jul 06
118
107
91
103
96
Jul 26
130
122
555
313
120
Aug 04
86
87
66
68
82
Aug 17
92
76
38
67
76
Sep 08
60
61
116
94
58
Sep 22
48
52
50
61
53
Oct 04
122
92
80
74
70
Oct 19
44
39
50
41
42
Nov 02
268
417
375
420
397
Nov 17
51
39
133
44
41
Dec 01
25
25
50
22
24
Dec 14
32
23
31
31
15
LA ¦ Lab Accident

-------
Date
1982
Jan 14
Jan 27
Feb 09
Feb 23
Mar 09
Mar 23
Apr 07
Apr 20
May 04
May 26
Jun 08
Jun 23
Jul 06
Jul 26
Aug 04
Aug 17
Sep 08
Sep 22
Oct 04
Oct 19
Nov 02
Nov 17
Dec 01
Dec 14
TABLE 8
DISSOLVED OXYGEN (mg/L) VALUES FROM THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
3
h Mile
Downstream
from Plant
10.5
9.4
10.6
11.5
11.9
11.8
13.0
10.0
14.0
8.5
8.0
9.3
7.6
7.6
12.8
19.9
9.6
10.1
10.1
11.6
9.4
13.0
12.0
13.5
10.3
9.5
10.7
11.3
12.3
12.2
12.9
10.0
14.0
8.4
8.2
9.4
7.8
7.4
11.2
21.3
10.0
10.2
11.2
11.5
9.3
12.6
12.3
13.6
9.0
8.7
8.7
7.6
8.9
7.5
12.4
10.9
7.1
7.4
8.5
9.2
8.0
6.4
6.6
7.9
7.3
9.7
7.4
10.6
7.7
8.3
7.3
13.9
10.3
9.5
10.1
11.1
12.0
12.1
13.4
10.1
14.5
8.3
8.1
9.3
8.2
7.2
9.6
15.7
9.1
10.4
11.1
11.2
9.4
12.5
12.0
13.6
10.3
9.6
14.8
11.3
12.1
12.0
12.9
10.3
14.8
8.4
8.2
9.2
7.9
7.8
11.5
20.2
9.9
10.4
12.1
11.4
9.3
12.9
12.3
13.5

-------
-32-
TABLE 9
CARBON DIOXIDE (mg/L) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
H Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
28.0
29.0
14.0
22.0
22.0
Jan 27
33.0
33.0
8.0
29.0
29.0
Feb 09
36.0
36.0
6.5
36.0
36.0
Feb 23
7.0
6.0
7.0
12.0
7.0
Mar 09
15.0
15.0
6.0
17.0
15.0.
Mar 23
14.0
13.0
4.0
13.0
13.0
Apr 07
9.5
9.5
9.0
9.8
10.0
Apr 20
8.0
7.5
7.5
8.0
8.0
May 04
5.5
3.5
3.4
2.0
2.0
May 26
4.5
4.5
2.0
4.3
4.3
Jim 08
3.0
2.2
1.6
2.7
2.8
Jun 23
2.0
2.1
1.5
2.0
1.8
Jul 06
1.7
2.4
2.4
1.9
1.7
Jul 26
2.3
1.9
<1.0
1.7
1.7
Aug 04
<1.0
<1.0
1.8
1.0
<1.0
Aug 17
<1.0
<1.0
1.5
1.5
1.0
Sep 08
5.5
5.0
3.2
5.1
4.0
Sep 22
5.6
3.5
2.8
5.6
2.8
Oct 04
1.8
<1.0
<1.0
<1.0
<1.0
Oct 19
2.2
2.2
3.0
2.3
2.2
Nov 02
5.5
5.5
2.6
3.8
3.8
Nov 17
10.0
10.0
3.8
10.0
10.0
Dec 01
5.0
5.0
1.6
3.4
3.8
Dec 14
11.0
11.0
13.0
13.0
13.0

-------
-33-
TABLE 10
TOTAL ALKALINITY (mg/L-CaC03) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
ftom Plant
1982
1
2
5
3
4
Jan 14 ,
254
254
67
249
250
Jan 27
241
240
120
237
238
Feb 09
233
229
74
227
244
Feb 23
69
75
125
78
77
Mar 09
199
195
138
193
193
Mar 23
101
98
93
98
98
Apr 07
179
178
179
179
178
Apr 20
172
173
172
171
172
May 04
173
170
102
168
172
May 26
160
180
130
175
175
Jun 08
193
192
139
188
193
Jun 23
215
214
260
215
216
Jul 06
212
212
214
213
212
Jul 26
214
215
281
229
217
Aug 04
181
172
96
152
171
Aug 17
152
151
118
146
152
Sep 08
205
204
132
182
201
Sep 22
220
225
222
214
224
Oct 04
223
224
228
224
223
Oct 19
236
235
237
234
245
Nov 02
194
181
163
178
180
Nov 17
189
187
201
184
184
Dec 01
241
240
134
231
238
Dec 14
235
236
231
232
234

-------
-34-
TABLE 11
CARBONATE (mg/L-CaC03) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
0
0
0
0
0
Jan 27
0
0
0
0
0
Feb 09
0
0
0
0
0
Feb 23
0
0
0
0
0
Mar 09
0
0
0
0
0
Mar 23
0
0
0
0
0
Apr 07
0
0
0
0
0
Apr 20
0
0
0
0
0
May 04
0
0
0
0
0
May 26
0
0
0
0
0
Jun 08
0
0
0
0
0
Jun 23
0
0
8
0
0
Jul 06
8
0
0
0
4
Jul 26
0
0
30
6
0
Aug 04
6
8
0
6
12
Aug 17
10
0
0
0
6
Sep 08
0
0
0
0
0
Sep 22
0
0
0
0
0
Oct 04
8
14
18
14
14
Oct 19
0
0
0
0
0
Nov 02
0
0
0
0
0
Nov 17
0
0
0
0
0
Dec 01
0
0
0
0
0
Dec 14
0
0
0
0
0

-------
-35-
TABLE 12
UNITS OF pH FROM THE CEDAR RIVER NEAR THE
DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
is Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
7.4
7.4
6.9
7.5
7.5
Jan 27
7.3
7.3
7.4
7.4
7.3
Feb 09
7.3
7.3
7.3
7.3
7.4
Feb 23
7.0
7.0
7.5
7.1
7.1
Mar 09
7.4
7.4
7.6
7.5
7.5
Mar 23
7.3
7.3
7.6
7.3
7.3
Apr 07
7.7
7.7
7.7
7.7
7.7
Apr 20
7.7
7.7
7.7
7.7
7.7
May 04
7.8
8.0
7.7
8.2
8.2
May 26
7.9
7.9
8.0
7.8
7.8
Jun 08
8.1
00
•
8.2
8.1
8.1
Jun 23
8.3
8.3
8.5
8.3
8.3
Jul 06
8.4
8.2
8.2
8.3
8.4
Jul 26
8.2
8.3
8.7
8.4
8.3
Aug 04
8.5
8.5
7.9
8.4
8.5
Aug 17
8.5
8.3
8.1
8.2
8.4
Sep 08
7.8
7.9
7.8
7.8
8.0
Sep 22
7.9
8.1
8.2
7.9
8.3
Oct 04
8.4
8.5
8.6
8.5
8.5
Oct 19
8.3
8.3
8.2
8.3
8.3
Nov 02
7.9
7.9
8.0
8.0
8.0
Nov 17
7.7
7.7
7.9
7.7
7.7
Dec 01
8.1
8.1
8.1
8.2
8.2
Dec 14
7.8
7.8
7.7
7.7
7.7

-------
-36-
TABLE 13
TOTAL HARDNESS (mg/L-CaC03) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
267
336
394
340
343
Jan 27
316
316
574
316
316
Feb 09
302
302
528
329
306
Feb 23
126
137
394
187
151
Mar 09
262
264
345
267
267
Mar 23
151
147
311
149
147
Apr 07
290
276
272
264
276
Apr 20
248
245
244
241
243
May 04
273
241
597
273
273
May 26
248
254
432
263
275
Jun 08
299
298
288
297
300
Jun 23
290
306
291
289
291
Jul 06
339
315
305
307
309
Jul 26
332
328
390
346
334
Aug 04
307
273
470
332
301
Aug 17
234
226
374
283
202
Sep 08
288
274
451
329
257
Sep 22
208
208
203
210
200
Oct 04
310
305
461
332
317
Oct 19
353
331
332
329
332
Nov 02
295
262
412
253
242
Nov 17
188
275
381
323
340
Dec 01
308
301
565
348
316
Dec 14
339
303
313
324
332

-------
-37-
TABLE 14
CALCIUM HARDNESS (mg/L-CaC03) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft.
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
183
229
267
233
233
Jan 27
213
215
444
215
213
Feb 09
202
201
358
228
205
Feb 23
89
97
263
142
111
Mar 09
155
151
182
156
158
Mar 23
107
104
222
104
103
Apr 07
207
194
185
186
194
Apr 20
169
168
168
165
168
May 04
182
171
374
178
182
May 26
174
177
308
185
203
Jun 08
219
217
208
216
217
Jun 23
200
220
205
202
205
Jul 06
230
210
208
208
210
Jul 26
201
197
217
206
201
Aug 04
178
173
167
207
202
Aug 17
142
135
225
165
117
Sep 08
195
177
300
215
165
Sep 22
190
190
190
180
185
Oct 04
192
190
282
197
190
Oct 19
215
210
215
212
210
Nov 02
199
168
257
159
154
Nov 17
139
188
275
234
230
Dec 01
207
197
360
232
210
Dec 14
230
202
215
220
225

-------
-38-
TABLE 15
TOTAL PHOSPHORUS (mg/L-P) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
		Sampling Locations	
Upstream	140 ft.	h Mile
Upstream of Plant Discharge Downstream Downstream
Date
of Plant
Intake
Canal
of Discharge
from Plant
1982
1
2
5
3
4
Jan 14
0.88
0.96
1.34
0.81
0.81
Jan 27
0.79
0.79
1.36
0.73
0.67
Feb 09
0.88
0.88
1.41
0.90
0.90
Feb 23
1.79
1.76
2.99
1.85
1.82
Mar 09
0.86
0.92
1.44
0.94
0.91
Mar 23
0.72
0.70
1.90
0.91
0.98
Apr 07
0.50
0.50
0.46
0.42
0.42
Apr 20
0.44
0.37
0.37
0.37
0.37
May 04
0.31
0.27
0.78
0.29
0.23
May 26
0.23
0.23
0.52
0.23
0.23
Jun 08
1.00
0.92
0.85
0.92
0.93
Jun 23
0.25
0.25
0.28
0,25
0,28
Jul 06
0.24
0.24
0.28
0.24
0.24
Jul 26
0.21
0.28
1.60
0.50
0.36
Aug 04
0.34
0.45
0.78
0.45
0.98
Aug 17
0.54
0.50
1.21
0.74
0.54
Sep 08
0.61
0.78
1.61
1.36
1.20
Sep 22
0.98
1.06
0.98
0.91
1.06
Oct 04
0.54
0.54
0.92
0.46
0.46
Oct 19
0.27
0.27
0.24
0.21
0.21
Nov 02
0.49
0.55
0.69
0.55
0.59
Nov 17
0.25
0.25
0.31
0.25
0.32
Dec 01
0.20
0.20
0.30
0.20
0.20
Dec 14
<0.2
<0.2
<0.2
<0.2
<0.2

-------
-39-
TABLE 16
SOLUBLE ORTHOPHOSPHATE (mg/L-P) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
	Sampling Locations	
Upstream	140 ft	\ Mile
Upstream of Plant Discharge Downstream Downstream
Date
1982
of Plant
Intake
Canal
of Discharge
from Plant
1
2
5
3
4
Jan 14
0.80
0.92
1.32
0.80
0.80
Jan 27
0.68
0.72
1.28
0.48
0.40
Feb 09
0.81
0.83
1.40
0.83
0.83
Feb 23
1.77
1.75
2.96
1.82
1.80
Mar 09
0.81
0.88
1.44
0.94
0.88
Mar 23
0.66
0.70
1.90
0.68
0.71
Apr 07
0.50
0.50
0.46
0.42
0.42
Apr 20
0.44
0.37
0.37
0.37
0 .37
May 04
<0.01
<0.01
0.58
<0.01
<0.01
May 26
0.13
0.12
0.31
0.13
0.17
Jun 08
0.09
0.10
0.14
0.10
0.09
Jun 23
0.08
0.08
0.09
0.08
0.08
Jul 06
0.10
0.10
0.15
0.10
0.10
Jul 26
0.06
0.06
0.09
0.07
0.05
Aug 04
0.03
0.01
0,02
0.05
0.05
Aug 17
0.02
0.02
0.26
0.06
0.05
Sep 08
0.12
0.13
0.25
0.17
0.13
Sep 22
<0.10
0.10
0.10
<0.10
<0.10
Oct 04
0.10
0.09
0.19
0.10
0.09
Oct 19
0.09
0.09
0.09
0.09
0.09
Nov 02
0.15
0.16
0.23
0.17
0.17
Nov 17
0.09
0.10
0.13
0.10
0.10
Dec 01
<0.01
<0.01
0.14
<0.01
<0.01
Dec 14
<0.01
<0.01
0.02
<0.01
<0.01

-------
Date
1982
Jan 14
Jan 27
Feb 09
Feb 23
Mar 09
Mar 23
Apr 07
Apr 20
May 04
May 26
Jun 08
Jun 23
Jul 06
Jul 26
Aug 04
Aug 17
Sep 08
Sep 22
Oct 04
Oct 19
Nov 02
Nov 17
Dec 01
Dec 14
-40-
TABLE 17
AMMONIA (tng/L-N) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
	Sampling Locations	
Upstream	140 ft	Mile
Upstream of Plant	Discharge	Downstream	Downstream
of Plant Intake	Canal	of Discharge	from Plant
1	2	5 		3	4
0.75
0.79
0.16
0.78
0.75
0.36
0.34
<0.02
0.34
0.36
0.59
0.54
0.09
0.54
0.53
0.95
0.87
0.55
0.85
0.85
0.57
0.63
0.40
0.63
0.64
0.77
0.76
0.53
0.77
0.81
0.34
0.25
0.25
0.25
0.25
0.40
0.42
0.45
0.44
0.44
0.09
0.06
0.12
0.06
0.07
0.05
0.04
0.05
0.02
0.04
0.07
0.04
0.03
0.06
0.04
0.05
0.02
0.02
0.01
0.07
0.02
0.07
0.04
0.40
0.02
0.02
0.02
0.05
0.02
0.02
<0.02
<0.02
<0.02
<0.02
<0.02
0.08
0.08
0.06
<0.02
0.08
<0.01
<0.01
<0.01
0.05
<0.01
<0.01
0.32
<0.01
0.35
0.01
0.04
0.03
0.13
0.15
0.03
0.06
<0.01
0.05
0.04
0.08
0.13
0.07
0.09
0.04
0.08
0.06
<0.01
0.12
0.12
<0.01
0.11
0.10
0.06
0.10
0.10
0.16
0.11
0.07
<0.03
0.11

-------
-41-
TABLE 18
NITRATE (mg/L-N) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
	Sampling Locations	
Upstream	140 ft	% Mile
Upstream of Plant Discharge Downstream Downstream
Date
of Plant
Intake
Canal
of Discharge
from Plant
1982
1
2
5
3
4
Jan 14
6.2
5.6
11.8
6.0
5.9
Jan 27
10.7
10.7
10.7
9.3
9.8
Feb 09
12.3
13.4
22.0
14.5
15.7
Feb 23
7.3
7.5
17.6
6.6
7.1
Mar 09
3.2
3.2
1.3
3.7
3.2
Mar 23
5.5
5.5
11.5
6.2
8.7
Apr 07
5.2
4.9
4.8
4.8
4.8
Apr 20
10.6
10.6
10.2
9.4
9.4
May 04
6.5
6.0
11.8
6.3
6.4
May 26
12.8
12.1
20.2
12.0
11.9
Jun 08
9.2
9.4
6.5
9.8
8.9
Jun 23
10.8
10.2
7.5
5.5
7.5
Jul 06
8.6
8.8
7.8
8.3
8.6
Jul 26
9.4
9.3
9.4
9.6
9.4
Aug 04
5.3
5.2
10.1
6.7
5.4
Aug 17
3.6
3.7
7.6
4.9
3.6
Sep 08
6.1
5.6
8.3
10.6
5.7
Sep 22
9.6
6.2
10.7
6.3
6,2
Oct 04
4.5
4.7
5.7
4.5
4.0
Oct 19
7.0
10.5
6.9
8.4
9.6
Nov 02
8.2
6.8
11.6
7.6
7.1
Nov 17
9.1
9.1
9.4
8.7
8.7
Dec 01
8.9
10.8
20.4
9.3
9.2
Dec 14
11.2
10.4
8.1
10.4
10.3

-------
Date
1982
Jan 14
Jan 27
Feb 09
Feb 23
Mar 09
Mar 23
Apr 07
Apr 20
May 04
May 26
Jun 08
Jun 23
Jul 06
Jul 26
Aug 04
Aug 17
Sep 08
Sep 22
Oct 04
Oct 19
Nov 02
Nov 17
Dec 01
Dec 14
-42-
TABLE 19
TOTAL IRON (mg/L) VALUES FROM THE CEDAR RIVER NEAR
THE DUANE ARNOLD ENERGY CENTER DURING 1982
	Sampling Locations		
Upstream	140 ft	h Mile
Upstream of Plant Discharge Downstream Downstream
of Plant Intake	Canal	of Discharge from Plant
1
2
5
3
4
0.30
0.14
0.23
0.10
0.23
0.14
0.17
0.49
0.15
0.15
0.23
0.19
0.39
0.22
0.15
4.78
4.44
5.90
4.66
6.10
0.21
0.21
0.45
0.29
9.20
3.19
3.55
8.80
3.65
4.35
2.28
2.12
2.43
2.32
2.24
2.07
2.08
2.15
2.07
2.22
0.78
0.90
1.17
0.77
0.78
2.0
1.8
2.7
1.8
0.6
8.95
8.60
6.20
11.2
11.4
1.93
1.91
1.92
2.01
1.97
1.84
2.09
1.76
1.64
1.88
2.75
3.51
16.4
6.06
2.61
0.02
0.03
0.04
0.03
0.03
0.58
0.65
0.04
0.03
0.47
2.12
1.43
2.50
1.79
1.12
0.81
1.10
1.12
0.68
0.62
2.43
1.73
1.68
1.23
2.02
0.65
0.05
1.17
0.88
0.93
4.45
1.12
8.02
8.38
8.12
0.52
2.10
0.81
2.30
2.70
0.67
0.76
1.10
0.84
<0.03
0.22
0.67
0.87
0.07
0.34

-------
-43-
TABLE 20
TANNINS & LIGNINS AS TANNIC ACID (mg/L) VALUES FROM THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations	
Upstream	140 ft	h Mile
Upstream of Plant Discharge Downstream Downstream
Date
of Plant
Intake
Canal
of Discharge
from Plant
1982
1
2
5
3
4
Jan 14
0.19
0.22
0.27
0.09
0.23
Jan 27
0.17
0.15
0.28
0.19
0.25
Feb 09
0.19
0.18
0.23
0.16
0.17
Feb 23
1.75
1.81
2.53
1.81
1.95
Mar 09
0.44
0.50
0.68
0.53
0.61
Mar 23
1.10
1.40
1.50
1.10
1.30
Apr 07
0.79
1.15
0.74
1.52
1.59
Apr 20
0.62
0.64
0.37
0.39
0.62
May 04
0.55
0.27
0.17
0.07
0.67
May 26
0.43
0.46
0.73
0.41
0.46
Jun 08
0.57
0.46
0.35
0.53
0.56
Jun 23
0.23
0.37
0.32
0.41
0.30
Jul 06
0.30
0.34
0.50
0.52
0.55
Jul 26
0.52
0.57
0.94
0.84
0.51
Aug 04
0.49
0.46
0.61
0.48
0.50
Aug 17
0.79
0.73
0.46
0.43
0.70
Sep 08
0.53
0.53
0.84
0.56
0.76
Sep 22
0.53
0.51
1.43
0.61
0.49
Oct 04
0.71
0.74
0.87
0.64
0.94
Oct 19
0.45
0.58
0.48
0.76
0.48
Nov 02
6.60
10.00
11.90
10.40
9.40
Nov 17
2.80
2.80
4.30
2.70
2.50
Dec 01
7.6
7.2
5.7
7.1
7.4
Dec 14
7.6
7.1
6.5
6.4
7.0

-------
-44-
TABLE 21
CHEMICAL OXYGEN DEMAND (mg/L) VALUES FROM THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
25
25
34
35
35
Jan 27
25
15
44
22
15
Feb 09
23
31
148
23
23
Feb 23
5t
44
196
56
64
Mar 09
34
37
219
46
55
Mar 23
4 6
55
238
64
78
Apr 07
61
61
327
61
66
Apr 20
34
48
59
51
43
May 04
27
21
34
15
34
May 26
35
31
1Q4
33
33
Juii 08
90
60
82
49
90
Jun 23
36
38
27
27
31
Jul 06
19
101
12
111
33
Jul 26
<10
18
213
56
29
Aug 04
50
37
54
44
34
Aug 17
20
20
23
37
75
Sep 06
81
92
83
102
92
Sep 22
67
22
33
33
70
Oct 04
69
79
76
76
48
Oct 19
26
19
36
50
19
Nov 02
36
54
72
57
68
Nov 17
12
<10
26
12
19
Dec 01
<10
<10
54
<10
<10
Dec 14
10
10
15
17
28

-------
-45-
TABLE 22
BIOCHEMICAL OXYGEN DEMAND (5-day) (mg/L) VALUES FROM THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER DURING 1982
Sampling Locations
Date
Upstream
of Plant
Upstream
of Plant
Intake
Discharge
Canal
140 ft
Downstream
of Discharge
h Mile
Downstream
from Plant
1982
1
2
5
3
4
Jan 14
3.3
4.8
4.2
4.2
4.8
Jan 27
5.1
3.3
3.9
3.0
3.3
Feb 09
9.6
2.1
2.1
1.2
3.0
Feb 23
8.4
8.7
16.5
9.6
14.1
Mar 09
1.2
<1.0
2.7
2.4
1.8
Mar 23
3.0
2.4
5.7
3.0
3.3
Apr 07
3.6
3.3
2.7
2.7
3.6
Apr 20
3.3
2.7
2.4
2.4
2.7
May 04
7.5
6.9
8.1
7.2
7.2
May 26
3.0
2.7
3.0
3.0
3.3
Jun 08
5.4
3.9
3.9
5.7
4.2
Jun 23
3.3
2.4
2.1
1.8
3.3
Jul 06
5.7
3.6
3.6
4.5
3.0
Jul 26
4.2
3.6
9.0
6.6
3.6
Aug 04
8.7
8.7
11.4
10.5
10.8
Aug 17
11.0
11.0
8.7
10.0
12.0
Sep 08
3.6
2.3
2.6
2.6
2.3
Sep 22
4.2
4.1
1.5
1.5
1.2
Oct 04
6.0
8.0
7.0
8.0
8.0
Oct 19
3.0
3.0
3.0
3.0
3.0
Nov 02
10.0
6.0
6.0
5.0
5.0
Nov 17
3.0
4.0
3.0
3.0
3.0
Dec 01
2.0
2.0
2.0
2.0
2.0
Dec 14
4.0
2.0
3.0
4.0
3.0

-------
QUARTERLY CHEMICAL ANALYSIS - 1982


Cl-
no2-n
SOiT2
Cr+6
Cu
Pb
Mn
Hg
Zn


(mg/L)
(mg/L)
(mg/L)
(Pg/L)
(Hg/L)
(Mg/L)
(lig/L)
(yg/L)
(yg/L)





May 26





1.
Upstream-Lewis Access
28.6
0.08
37.8
<3
2.2
5.1
80
<0.2
8.6
2.
DAEC Upstream
28.0
0.08
28.2
<3
2.4
6.4
80
<0.2
8.8
3.
DAEC Downstream
27.1
0.08
35.2
<3
4.1
6.4
90
<0.2
7.7
4.
\ Mile Below Plant
27.7
0.08
30.2
<3
28.9
34.6
90
<0.2
45.1
5.
Discharge Canal
37.6
0.06
280.4
<3
25.4
10.6
150
<0.2
18.4





August 17





1.
Upstream-Lewis Access
19
0.03
40
2.6
21.0
*1.0
90
<0.2
30
2.
DAEC Upstream
18
0.03
40
2.6
6.0
<1.0
180
<0.2
60
3.
DAEC Downstream
27
0.03
178
2.6
8.0
<1.0
<20
<0.2
70
4.
% Mile Below Plant
18
0.03
42
2.6
10.0
<1.0
60
<0.2
60
5.
Discharge Canal
46
0.10
469
2.6
36.0
<1.0
<20
<0.2
80




November 17





1.
Upstream-Lewis Access
19.4
0.02
26
<4
6.2
11.4
80
<0.2
30
2.
DAEC Upstream
18.6
0.02
27
<4
3.9
10.3
90
<0.2
20
3.
DAEC Downstream
17.2
0.02
31
<4
4.5
3.8
120
<0.2
20
4.
H Mile Below Plant
17.9
0.02
31
<4
6.2
10.5
420
<0.2
30
5.
Discharge Canal
19.6
0.02
69
4
6.6
0.8
240
<0.2
110

-------
-47-
TABLE 24
WATER TEMPERATURE, DISSOLVED OXYGEN, pH,.AND ALKALINITY
DATA COLLECTED IN THE CEDAR RIVER DIEL STUDY CONDUCTED
NEAR DUANE ARNOLD ENERGY CENTER, 8 AND 9 JUNE 1982 "
Dissolved

Time
Temoerature Oxygen
PH
Alkalini'
Date
(Hrs)
(C)
(mg/1)
(Units)
(mg/1-CaCI



Location 1


8 June 1982
1315
19.0
7.8
8.1
195
8 June 1982
1700
18.8
8.0
8.1
193
8 June 1982
2110
18.5
8.2
8.1
194
9 June 1982
0105
18.4
8.1
8.1
199
9 June 1982
0505
18.2
8.0
8.2
196
9 June 1982
0910
18.2
8.0
8.0
177



Location 2


8 June 1982
1405
19.0
8.0
8.1
196
8 June 1982
1745
18.9
8.2
8.1
192
8 June 1982
2150
18.3
8.2
8.1
193
9 June 1982
0150
18.3
8.2
8.1
196
9 June 1982
0540
18.2
8.3
8.2
200
9 June 1982
0940
18.1
8.2
8.0
188



Location 3


8 June 1982
1400
19.0
8.5
8.1
195
8 June 1982
1740
19.0
8.1
8.1
188
8 June 1982
2145
18.5
8.1
8.1
191
9 June 1982
0145
18.5
8.3
8.1
198
9 June 1982
0535
18.4
8.4
8.2
198
9 June 1982
0935
18.4
8.1
8.0
190



Location 4


8 June 1982
1355
19.1
8.1
8.1
196
8 June 1982
1735
18.9
8.2
9.1
193
8 June 1982
2140
18.4
8.1
8.1
192
9 June 1982
0140
18.4
8.1
8.1
197
9 June 1982
0530
18.3
8.0
8.2
200
9 June 1982
0930
18.4
8.3
8.0
191



Location 5


8 June 1982
1410
19.7
8.6
8.2
138
8 June 1982
1750
20.4
8.5
8.2
139
8 June 1982
2155
19.0
8.8
8.2
166
9 June 1982
0155
19.8
8.6
8.2
201
9 June 1982
0545
19.2
9.0
8.1
196
9 June 1982
0950
20.4
8.6
8.1
173

-------
-48-
TABLE 24 (cont'd)
WATER TEMPERATURE, DISSOLVED OXYGEN, pH, AND ALKALINITY
DATA COLLECTED IN THE CEDAR RIVER DIEL STUDY CONDUCTED
NEAR DUANE ARNOLD ENERGY CENTER, 18 AND 19 AUGUST 1982
Time Temperature
Date	(Hrs) (C)
Dissolved
Oxygen	pH Alkalinity
(mg/1)	(Units) (mg/l-CaC03)
Location 1
18 August 1982
0655
24.0
9.9
8.3
164
18 August 1982
1055
24.8
13.4
8.7
170
18 August 1982
1445
26.3
19.2
8.3
145
18 August 1982
1830
26.5
19.4
8.4
130
18 August 1982
2255
25.5
13.8
8.3
136
19 August 1982
0245
24.9
10.7
8.1
145



Location 2


18 August 1982
0615
24.0
9.2
8.3
153
18 August 1982
1015
24.3
14.3
8.8
161
18 August 1982
1415
26.0
19.0
8.5
144
18 August 1982
1757
26.6
19.9
8.8
128
18 August 1982
2235
26.0
13.8
8.4
128
19 August 1982
0205
25.3
11.0
8.2
136



Location 3


18 August 1982
0600
24.2
8.6
8.2
153
18 August 1982
1000
24.4
14.4
8.8
148
18 August 1982
1400
26.5
15.6
8.5
138
18 August 1982
1745
26.8
15.9
8.5
124
18 August 1982
2203
26.3
11.9
8.4
126
19 August 1982
0150
25.2
9.8
8.1
133



Location 4


18 August 1982
0610
24.1
8.8
8.2
151
18 August 1982
1007
24.2
14.0
8.8
157
18 August 1982
1408
26.0
19.1
8.7
149
18 August 1982
1752
26.4
19.5
8.6
132
18 August 1982
2215
26.1
14.1
8.5
125
19 August 1982
0200
25.3
11.6
8.2
132



Location 5


18 August 1982
0630
24.1
8.1
8.0
147
18 August 1982
1025
25.0
8.7
8.0
109
18 August 1982
1420
27.4
7.6
8.0
117
18 August 1982
1805
27.0
7.3
7.6
102
18 August 1982
2230
26.0
8.4
8.4
128
19 August 1982
0220
25.1
8.0
8.0
134

-------
-49-
TABLE 24 (cont'd)
WATER TEMPERATURE, DISSOLVED OXYGEN, pH, AND ALKALINITY
DATA COLLECTED IN THE CEDAR RIVER DIEL STUDY CONDUCTED
AT DUANE ARNOLD ENERGY CENTER, 17 AND T8 NOVEMBER 1982
Dissolved
Time Temperature Oxygen	pH Alkalinity
Ml	(hrs) (C)	(mg/1) (Units) (mg/l-CaC03)
Location 1
17 November 1982
0615
1.0
12.9
7.7
176
17 November 1982
1010
1.1
12.9
7.7
184
17 November 1982
1410
1.6
13.0
7.7
189
17 November 1982
1818
1.7
12.8
7.7
191
17 November 1982
2200
1.8
12.6
7.7
194
18 November 1982
0150
1.9
12.7
7.6
195


Location 2


17 November 1982
0720
0.8
12.8
7.7
178
17 November 1982
1048
1.1
13.0
7.7
182
17 November 1982
1512
1.6
12.6
7.7
187
17 November 1982
1910
1.7
12.6
7.6
187
17 November 1982
2237
1.7
12.7
7.6
190
18 November 1982
0225
1.7
12.7
7.6
192


Location 3


17 November 1982
0719
1.8
12.7
7.7
165
17 November 1982
1045
2.2
12.6
7.7
176
17 November 1982
1510
2.0
12.5
7.7
184
17 November 1982
1908
2.2
12.5
7.6
186
17 November 1982
2235
2.2
12.8
7.6
186
18 November 1982
0223
2.1
12.6
7.6
190


Location 4


17 November 1982
0715
0.8
12.9
7.7
177
17 November 1982
1040
1.2
12.9
7.7
179
17 November 1982
1500
1.8
12.9
7.7
184
17 November 1982
1905
1.8
12.6
7.6
186
17 November 1982
2230
1.8
12.7
7.6
189
18 November 1982
0220
1.8
12.7
7.6
190


Location
5


17 November 1982
0635
19.9
8.6
8.2
194
17 November 1982
1030
18.8
9.0
8.2
202
17 November 1982
1445
22.4
8.3
7.9
201
17 November 1982
1850
15.8
9.1
7.7
159
17 November 1982
2220
14.3
9.6
7.6
149
18 November 1982
0210
16.8
9.2
7.7
150

-------
-50-
TABLE 25
DENSITIES (no./m2) AND PERCENT COMPOSITION OF THE DOMINANT*a*
BENTHIC MACROINVERTEBRATES COLLECTED WITH A PONAR GRAB SAMPLER
FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER, 27 MAY 1982
Location

)

2

3

4

Taxon
no/m2
%
no/m2 %
no/m*
¦ %
no/m2
%
Rhabdocoela
near Macrostomum" sp.
435
60.5
0
0.0
95
20.0
397
91.3
Oligochaeta
Unid. Aeolosomatidae
Imm. Tubificidae w/o cap.
0
0
0.0
0.0
0
38
0.0
9.1
113
. 0
24.0
0.0
0
0
0.0
0.0
Trichoptera
Potamyia flava
0
0.0
0
0.0
76
16.0
0
0.0
Diptera
Chernovskiia orbicus
Polypedilum simulans type
227
0
31.5
0.0
0
321
0.0
77.3
0
19
0.0
4.0
38
0
8.7
0.0
Total Macrostomidae
Total Tubificidae
Total Hydropsychidae
Total Chirononridae
Total Benthos
435
0
0
246
718
60.5
0.0
0.0
34.2
0
95
0
321
416
0.0
22.7
0.0
77.3
95
0
76
95
473
20.0
0.0
16.0
20.0
397
0
0
38
435
91.3
0.0
0.0
8.7
Total Taxa
5

5

13

2

(a) Taxa that compose > 5% of the total benthos at any location.

-------
-51-	
TABLE 25 (cont'd)
DENSITIES (no./m2) AND PERCENT COMPOSITION OF THE DOMINANT^)
BENTHIC MACROINVERTEBRATES COLLECTED WITH A PONAR GRAB SAMPLER
FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER, 17 AUGUST 1982
Location
Taxon
Rhabdocoela
near Macrostomum sp.
Di ptera
Chernovskiia orbicus
Phaenopsectra sp.
Rheotanytarsus sp
Robackia claviger
near Corynoneura sp.
Gastropoda
Physa sp.
Total	Macrostomidae
Total	Chironomidae
Total Physidae
Total Benthos
Total Taxa
1


t

3

4
no/m2
%
no/m2
%
no/m2
%
no/m2
%
19
1.9
113
42.9
132
77.8
1172
79.5
0
0.0
19
7.1
0
0.0
57
3.9
416
41.5
0
0.0
0
0.0
0
0.0
19
1.9
0
0.0
19
11.1
0-
0.0
529
52.8
57
21.4
0
0.0
208
14.1
0
0.0
76
28.6
0
0.0
0
0.0
0
0.0
0
0.0
19
11.1
0
0.0
19
1.9
113
42.9
132
77.8
1172
79.5
983
98.1
151
57.1
19
11.1
284
19.2
0
0.0
0
0.0
19
11.1
0
0.0
1002

265

170

1474

5

4

4

5

(a) Taxa that compose > 5% of the total benthos at any location.

-------
-52-
TABLE 25-(cont'd)
DENSITIES (no/tn2) AMD PERCENT COMPOSITION OF THE DOMINANT (a)
BENTHIC MACROINVERTEBRATES COLLECTED WITH A PONAR GRAB SAMPLER
FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER, 18 NOVEMBER 1982
Location

1


2

3

4
Taxon
no/m2
%
no/m2
%
no/m2
%
no/m2
%
Rhabdocoela
near Macrostomum sp.
548
53.7
1058
86.2
1418
98.7
1625
89.6
Diptera
Robackia claviger
near Corynoneura sp.
435
0
42.6
0.0
0
113
0.0
9.2
19
0
1.3
0.0
57
132
3.1
7.3
Total Macrostomidae
Total Chironomidae
Total Benthos
548
473
1021
53.7
46.3
1058
170
1229
86.2
13.9
1418
19
1436
98.7
1.3
1625
189
1814
89.6
10.4
Total Taxa
4

4

2

3

(a) Taxa that compose > 5% of the total benthos at any location.

-------
-53-
TABLE 26
TAXONOMIC LIST OF BENTHIC MACROINVERTEBRATES COLLECTED FROM
THE CEDAR RIVER NEAR THE DUANE ARNOLD ENERGY CENTER,
APRIL - NOVEMBER 1982	
	Source of Collection
Natural	Artificial
		Taxon 		Substrate Substrate
Platyhelminthes
Turbellaria
Macrostomidae
near Macrostomum sp. Schmidt	Xvfl)
Nematoda
Unidentified Nematoda	X
Entoprocta.
Urnatellidae
Urnatella gracilis Leidy	X
Annelida
Oligochaeta
Plesiopora
Aeolosomatidae
Unidentified Aeolosomatidae	X
Enchytraeidae
Unidentified Enchytraeidae	X
Naididae
Nais behningt (Mfchaelsen)	X
N. bretscher'i (Michaelsen)	X
!• conwuni's Tiguet	X
N. variabilis Piguet	X
Figuetiella michiganensis Hiltunen	X
Prfstlna Toreli CPiguet)	X
Tublficidae
Limnodrilus clanaredianus Ratzel	X
L. hoffmeTiten Claparede	X
r. udekemianus Claparede	X
Arthropoda
Crustacea
Isopoda
Asellidae
Asellus sp. Geoffrey St. Hillaire	X
Talitridae
Hyalella azteca (Saussure)	X

-------
-54-
TABLE 26 (cont'd)
Source' of' Collection
Natural	Artificial
Taxon	Substrate Substrat'e
Insect a
Ephemeroptera
Potamanthidae
Potamanthus sp. Pictet	X
Ephemeridae
Hexagenia sp. Walsh	X
Caenidae
Caenis sp. Stephens	X
Tricorvthodes sp. Ulmer	X
Heptagen-iidae
Heptaqenla diabasia Burks	X
H'. flavescens (Walsh)	X
Stenacron interpunctatuiii Jensen	X
Stenonema sp. Traver	X
S. exiguum T raver	X
1>. integrurn (McDunnough)	X
S. terminatuiii (Walsh)	X
Baetidae
Baeti's sp. Leach	X
Isonychi'a sp. Eaton	X
Odonta
Coenagrionidae
Unidentified Coenagrionidae	X
Plecoptera
Perlodidae
Isoperl'a sp. Banks	X
Trichoptera
Hydropsychidae
Cheumatopsychfe sp. Wallengren	X
Hydroosvcne orris Ross	X
H. phalerifra Hagen	X
H. simulan's Ross	X
Fotamvia fTava Hagen	X	X
Polycentropodidae
NeureclipsIS sp. McLachlan	X
Coleoptera
Elmidae
StenelmiS sp. Dufour	X
Dlptera
Tipulidae
Unidentified Tipulidae	X
Slmuliidae
Simulium so. Latreille	X	X

-------
-55-
TABLE 26 (cont'd)
Source of Collection
Natural	Artificial
Chironomidae
Chironomlnae
Chernovski ia orbicus (Townes)	X
Cryptochironomus sp. Kieffer	X
Cryptotendipes sp. Lenz	X
Dicrotendi pes sp. Kieffer	X
Glyptotendipes sp. Jueffer	X
Micropsectra sp. Kieffer	X
Paratanvtarsus sp. Kieffer	X
Paratendioes near connectens Lipina	X	X
Phaenopsectra sp. kieffer	X	X
Polypedilum convictum type	X
P. simula"ns type	X	X
ftheotanytarsus sp. (Bause)	X	X
Robackia claviger (Townes)	X
Stenochironomus sp. Kieffer	X
Stictochironomus sp. Kieffer	X	X
Tanypodinae
Procladius sp. Skuse	X
Thienemannimyia series sensu Fittkau	X
Orthocladiinae
near Corynoneura sp. (Winnertz)	X
Cricotopus sylvestris group sensu Hirvenoja	X
C. tremulus group sensu Hirvenoja	X
Eukiefferiell a sp. Thienemann	X
Nanocl-adius sp. Kieffer	X
Parakiefferiella sp. (Thienemann)	X
Rheocricotopus sp. Thienemann and Harnisch	X
Empididae
Unidentified Empididae	X
Stratiomyi idae
Unidentified Stratiomyiidae	X
Mollusca
Gastropoda
Basomatophora
Phvsidae
Phvsa sp. Oraparnaud	X
Pel ecypoda
Heterodonta
Sphaeriidae
Sphaerium transversum (Say)	X
Total Taxa	25	50
(a) "X" indicates taxon was present.

-------
-56-
TABLE 27-
ABUNDANCE (no./sampler) AND PERCENT COMPOSITION OF THE DOMINANT*3)
MACROINVERTEBRATES COLONIZING HESTER-DENDY ARTIFICIAL SUBSTRATE
SAMPLERS FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER,
7 APRIL - 25 MAY 1982 	 	 	
Location
Taxon

1

2

3

4
no.
%
no.
% ¦
no.
%
no.
%
Oligochaeta





0.0


Nais Behninqi
0
0.0
0
0.0
0
17
8.9
Ephemeroptera








Isonychia sp.
2
6.9
5
8.5
0
0.0
9
4.7
tmm. Heptageniidae
6
20.7
0
0.0
0
0.0
6
3.1
Stenonema sp.
2
6.9
0
0.0
1
2.2
2
1.0
S. ihteqrum
0
0.0
3
5.1
0
0.0
0
0.0
Trichoptera








Hydropsyche orris
2
6.9
14
23.7
6
13.3
49
25.5
H. simulans
7
24.1
6
10.2
18
40.0
36
18.8
Potamyia flava
6
20.7
15
25.4
5
11.1
36
18.8
Di ptera




8



Simulium sp.
3
10.3
3
5.1
17.8
19
9.9
Thierieniannimyia series
0
0.0
6
10.2
0
0.0
4
2.1
Eukiefferiella sp.
0
0.0
0
0.0
3
6.7
0
0.0
Total Naididae
0
0.0
3
5.1
0
0.0
25
13.0
Total Oligoneuriidae
2
6.9
5
8.5
0
0.0
9
4.7
Total Heptageniidae
8
27.6
3
5.1
3
6.7
8
4.2
Total Hydropsychidae
15
51.7
35
59.3
29
64.4
121
63.0
Total Simuliidae
3
10.. 3
3
5.1
8
17.8
19
9.9
Total Chironomidae
1
3.5
9
15.3
3
6.7
10
5.2
Total Benthos
29

59

45

192

Total Taxa
8

14

9

17

(a) Taxa that compose > 5% of the total benthos at any location.

-------
-57-
TABLE 27 (cont'd)
ABUNDANCE (no./sampler)AND PERCENT COMPOSITION OF THE DOMINANT^3)
MACROINVERTEBRATES COLONIZING HESTER-DENDY ARTIFICIAL SUBSTRATE
SAMPLERS FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER,
6 JULY - 17 AUGUST 1982
Location
Taxon
Ephemeroptera
Isonychia sp.
Heptaqenia flavescens
Stenonema sp.
S. integrum
(Taems sp.
Trichoptera
Hydropsvche orris
H. simuTans
Fotamyia flava
Diptera
Simulium sp.
Polypedilurn convi ctum type
Thienimannimyia series
Stenochironomus sp.
Total Oligoneuriidae
Total Heptageniidae
Total Caenidae
Total Hydropsychidae
Total Simuliidae
Total Chironomidae
Total Benthos
Total Taxa
1

2

3

4
no. • %
no.
i
no.
%
no.
%
-(b)
11
2.4
7
6.2
7
2.4
«m •»
8
1.7
1
0.9
20
6.9

6
1.3
5
4.6
15
5.2

1
0.2
22
20.2
8
2.8

5
1.1
9
8.3
4'
1.4
m —
90
19.4
0
0.0
42
14.5
«»«•
119
25.6
25
22.9
102
35.3

79
17.0
1
0.9
9
3.1

86
18.5
0
0.0
55
19.0

28
6.0
2
1.8
11
3.8
—
4
0.9
15
13.8
1
0.4
——
0
0.0
8
7.3
1
0.4
--
11
2.4
7
6.2
7
2.4
—
15
3.2
29
26.6
45
15.6
—
6
1.3
10
9.2
5
1.7
—
288
61.9
27
24.8
153
52.9
mm mm
86
18.5
0
0.0
55
19.0
—
37
8.0
33
30.3
18
6.2
—
465

109

289

—
21

19

21

(a)	Taxa that compose > 55& of the total benthos at any location.
(b)	Dash (—) indicates the sampler was lost.

-------
-58-
TABLE 27 (cont'd)
ABUNDANCE (no./sampler) AND PERCENT COMPOSITION OF THE DOMINANT^3)
MACROINVERTEBRATES COLONIZING HESTER-OENDY ARTIFICIAL SUBSTRATE
SAMPLERS FROM THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER,
4 OCTOBER - 18 NOVEMBER 1982	
Location
Taxon

1

2
3


4
no.
%
no.
%
no.
*
n
no.
%
Oligochaeta








Nais behningi
9
13.0
19
9.3
8
5.4
14
8.4
Ephemeroptera




13
8.7


Heotaqenia flavescens
1
1.5
14
6.8
3
1.8
Plecoptera





2.0


IsoperTa sp.
2
2.9
7
3.4
3
17
10.2
Trichoptera




27
18.1


Immature Hydropsychidae
11
15.9
30
14.6
16
9.6
Hydropsyche orris
9
13.0
14
6.8
26
17.5
27
16.3
H. simulans
23
33.3
58
28.3
41
27.5
47
28.3
Potamyia flava
4
5.8
16
7.8
4
2.7
10
6.0
Diptera



8.8
12
8.1


Rheotanytarsus sp.
•
5
7.3
18
2
1.2
Total Naididae
9
13.0
22
10.7
8
5.4
21
12.7
Total Heptageniidae
1
1.5
21
10.2
17
11.4
11
6.6
Total Perlodidae
2
2.9
7
3.4
3
2.0
17
10.2
Total Hydropsychidae
47
68.1
119
58.1
100
67.1
101
60.8
Total Chironomidae
7
10.1
31
15,1
16
10.7
8
4.8
Total Benthos
69

205

149

166

Total Taxa
12

22

17

23

la) Taxa that compose > 5% of the total benthos at any location.

-------
DENSITY AND PERCENT OCCURRENCE OF DOMINANT TAXA, MAJOR DIVISIONS, AND TOTAL PERIPHYTON
COLLECTED FROM ARTIFICIAL SUBSTRATES IN THE CEDAR RIVER NEAR THE DUANE ARNOLD ENERGY
CENTER, MAY, AUGUST, AND DECEMBER 1982
Taxa

25 May
1982


19 August 1982

1
December 1982

Location
i 2
Location
i 3
Location 2
Location
i 3
Locatior
i 2
Location 3
2
units/cm
t
0
units/cm'
*
2
units/cm
%
2
units/cm
X
2
units/cm
*
M
2
units/cm

BACILLARIOPHYTA












Achnanthes lanceolata
41,991
16.04
149,055
22.40
n
0.00
53,634
4.40
0
0.00
0
0.00
Cyclotella atomus
278
o.u
0
0.00
43,194
4.75
103,770
8.51
0
0.00
0
0.00
Cyclotella meneghlniana
2,225
0.85
0
0.00
27,616
3.04
157,404
12.90
2,419
0.30
0
0.00
Cyclotella












pseudostelligera
n
0.00
0
0.00
46,735
5.14
64,127
5.26
4.839
0.60
2,856
0.30
Gomphonema parvulum
2.781
1.06
43,382
6.52
125,334
13.79
104,936
8.60
19,355
2.39
19,038
2.00
Gomphonema olivaceum
18,076
6.91
88,988
13.37
0
0.00
0
0.00
600,000
74.02
866,208
90.83
Navicula cryptocephala












v. veneta ,
13,904
5.31
23,359
3.51
0
0.00
0
0.00
6,452
0.80
0
0.00
Navicula pelllculosa
0
0.00
0
0.00
170,653
18.78
2,332
0.19
0
o.on
0
0.00
Navlcula tripunctata
22.R03
8.71
26,140
3.93
0
0.00
0
0.00
0
0.00
0
0.00
Nitzschia dissipata
38,654
14.77
83,982
12.62
5,665
0.62
0
0.00
8,065
0.99
3,808
0.40
Mitzschia palea
18,076
6.91
31,702
4.76
47,443
5.22
73,455
6.02
7,258
0.90
3,808
0.40
Nitzschia paleacea
0
0.00
5,006
0.75
55,232
6.08
29,149
2.39
8,871
1.09
0
o.oo
Skeletonema potamos
0
0.00
0
0.00
33,989
3.74
159,736
13.09
3,226
0.40
0
0.00
Total Bacillariophyta
228,583
87.34
604,004
90.76
708,100
77.91
1,165,961
95.56
806,450
99.48
951,883
99.81
CHLOROPHYTA
1,841
0.70
13,873
2.08
16,458
1.81
14,612
1.20
696
0.09
174
0.02
CRYPTOPHYTA
230
0.09
0
0.00
0
0.00
130
0.01
87
0.01
0
0.00
CYANOPHYTA












Lyngbya epiphytica
0
0.00
0
0.00
138,110
15.20
0
0.00
0
0.00
0
0.00
Lyngbya spp.
25,776
9.85
33,501
5.03
0
0.00
0
0.00
0
0.00
0
0.00
Total Cyanophyta
31,070
11.87
47,635
7.16
184,280
20.28
39,145
3.21
3,393
0.42
1,566
0.16
EUGLENOPHYTA
0
0.00
0
0.00
0
0.00
261
0.02
0
0.00
87
0.01
TOTAL PERIPHYTON
261,724

665,512

908,838

1,220,109

810,626

953,710


-------
-60-
TABLE 29
PERIPHYTON BIOMASS PRODUCTION (mg/dm2/day) FROM SAMPLES COLLECTED
IN THE CEDAR RIVER NEAR THE DUANE ARNOLD ENERGY CENTER,
MAY, AUGUST, AND DECEMBER 1982			
1 December
0.91
0.92
1.05
0.96
0.96
0.63
1.18
0.78
0.85
0.86
Location
Me
25 May
19 Auqust
2
a
1.94
3.55

B
1.81
4.01

c
(a)
3.41

D
(a)
(a)

Mean
1.88
3.66
3
A
1.38
1.90

B
1.48
2.00

c
0.38
2.03

D
(a)
(a)

Mean
1.08
1.98
^ Missing replicate.

-------
TOTAL NUMBER OF FISH COLLECTED BY ALL SAMPLING METHODS ON THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER - MAY 25, 26 1982

LEWIS ACCESS

DAEC
SITE




Baited


Baited


Electro-

Hoop
Electro-

Hoop
Total
Species
shocking
Seine
Net
shocking
Seine
Net
Number
Bluntnose Minnow

3 %

2

Bullhead Minnow

0

1

Sand Shiner

0

3

Spotfin Shiner

6

14

Carp
0


1

Highfin Carpsucker
0


1

Quillback
2


1

River Carpsucker
6
2
2
2
0
6

Bigmouth buffalo
1


1

Bluegill

1

1

Green Sunfish

0

1

Black Crappie


1
0

Black Bullhead


1
0

Channel Catfish

2

2

Number of Individuals
9
14
4
6
24
6
61
Number of Species
3
5
3
5
7
1
14

-------
TOTAL NUMBER OF FISH COLLECTED BY ALL SAMPLING METHODS ON THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER - AUG 17, 18, 1982

LEWIS ACCESS


DAEC SITE


Species
Electro-
shocking
Seine
Baited
Hoop
Net
Electro-
shocking
Seine
Baited
Hoop
Net
Total
Number
Bluntnose Minnow

Bullhead Minnow
1
Fathead Minnow

1


Creek Chub

1




Spotfin Shiner

15

71
Gizzard Shad
1



Carp
3


15
Highfin Carpsucker
1





River Carpsucker
36


20

8

Bigmouth Buffalo
2



Smallmouth Bass
1


White Crappie


1

Northern Pike
3



Channel Catfish

1

2
1


Number of Individuals
46
18
1
38
73
8
184
Number of Species
6
4
1
4
3
1
14

-------
TOTAL NUMBER OF FISH COLLECTED BY ALL SAMPLING METHODS ON THE CEDAR RIVER
NEAR THE DUANE ARNOLD ENERGY CENTER - NOV. 17 AND DEC. 1, 1982

LEWIS
ACCESS


DAEC SITE


Species
Electro-
shocking
Seine
Baited
Hoop
Net
Electro-
shocking
Seine
Baited
Hoop
Net
Total
Number
Bluntnose minnow
1

Bullnose minnow

1



Brook silverside
1




Bigmouth shinner

2



Sand shinner

2

3

Spotfin shinner

51

18

Gizzard shad

1



Carp
5


3

Golden redhorse
1

Shorthead redhorse
1

River carpsucker
7


13

Bigmouth buffalo
1




Icthiobinae

2

5

Mud darter

1



Johnny darter

1



White crappie
4




Bluegill
1




Number of Individuals
19
61
0
18
27
0
125
Number of Species
6
8
0
4
4
0
17

-------
-64-
TABLE 31 -
DAILY NUMBERS OF FISH IMPINGED AT THE DUANE ARNOLD
ENERGY CENTER, JANUARY - DECEMBER 1982
Day of












the Month
Jan
Feb
Mar
to
Max
II
Jul
Aug
Sep
Oct
Nov
De<
1
0
0
1
0
0
0
0
0
0
0
0
1
2
1
8
0
0
1
0
0
0
0
0
0
4
3
0
2
0
0
0
0
0
0
0
0
0
2
4
0
1
0
0
1
0
0
1
0
0
0
0
5
0
0
0
0
0
0
0
9
0
0
0
2
6
0
0
3
0
0
0
0
1
0
0
2
1
7
0
0
0
0
0
0
0
0
0
1
1
1
8
0
0
0
0
0
0
0
0
0
0
2
2
9
0
3
0
0
0
0
0
0
0
0
0
1
10
0
4
1
0
0
0
1
0
0
0
0
0
11
0
3
0
0
0
0
0
0
0
0
1
0
12
0
0
0
0
0
0
0
0
0
0
1
6
13
0
0
9
2
0
0
0
0
0
0
0
1
14
0
0
6
0
0
0
1
0
0
0
0
1
15
0
0
3
0
0
1
0
1
0
1
0
3
16
0
0
0
0
0
0
0
0,.
. 0
0
1
3
17
0
0
0
0
0
0
0
ow 0
0
2 ~,«
4
18
0
0
1
0
1
0
1
0
0
0
l(b)
5
19
0
1
0
0
0
0
0
0
0
0
0
2
20
°/ ^
0
0
0
0
0
1
0
0
0
2
4
21
-(a)
0
0
1
0
0
0
0
0
0
1
6
22
-

0
0
0
1
0
1
0
0
0
3
23
-
0(b)
0
0
0
0
0
0
0
0
1
7
24
-
0
0
0
0
0
0
1
0
0
2
2
25
-
0
0
0
0.
. 0
0
0
1
1
0
1
26
-
0
0
0
0(d) 0
0
0
0
0
2
2
27
-
0
0
0
0
0
1
0
0
0
5
0
28
-
0
0
2
0
0
1
0
0
0
8
0
29
-

0
0
0
0
0
0
0
0
6
0
30
16

0
0
0
0
0
0
0
0
1
0
31
8

0

0

0
0

0

0
Total
25
22
24
5
3
2
6
14
1
3
39
64
Annual Total 208
(a)	Basket frozen, unable to perform count.
(b)	Dates that impingement collections were made by EA personnel.

-------
MEAN ABUNDANCE AND PERCENT OCCURRENCE OF ZOOPLANKTON IDENTIFIED FROM ENTRAPMENT SAMPLES
COLLECTED QUARTERLY IN THE CEDAR RIVER NEAR DUANE ARNOLD ENERGY CENTER, 1982	
	Taxa	
Nauplii
Calanoid copepodites
^Cyclopoid copepodites
^Cyclops vernal is
*£. bicuspidatus thomasi
^Diaptomus sililoides
•^Eucyclops speratus
TOTAL COPEPODA
¦^tBosmina lonqirostris
^Ceriodaphnia pulchella
^ Chydorus sphaericus
¦^Daphnia parvula
-^Scapholeberis kingi
TOTAL CLADOCERA
Asplanchna spp.
Bdelloid Rotifera
Brachionus spp.
Cephalodella spp.
Conochiloides spp.
Conochilus spp.
Euchlanis spp.
Filinia spp.
Kellicottia sp.
Keratella spp.
Lecane spp.
Monostyla spp.
Notholca spp.
Notomnatid Rotifera
Polyarthra spp.
Pompholyx spp.
Svnchaeta spp.
Unidentified Roti fera
TOTAL ROTIFERA
TOTAL ZOOPLANKTON
23 February
27 May
18 August
18 November
No./m°
%
No./mJ
%
No./mJ
%
No./mJ
%
209
3.13
6269
23.99
676
2.92
1432
6.31
0
0.00
0
0.00
0
0.00
50
0.22
38
0.57
88
0.34
24
0.00
75
0.33
19
0.28
0
0.00
24
0.10
0
0.00
0
0.00
0
0.00
0
0.10
12
0.05
0
0.00
0
0.00
0
0.00
25
0.11
19
0.28
0
0.00
0
0.00
0
0.00
285
4.27
6357
24.32
724
3.13
1594
7.03
76
1.14
353
1.35
24
0.10
311
1.37
0
0.00
0
0.00
0
0.00
12
0.05
0
0.00
0
0.00
0
0.00
25
0.11
0
0.00
0
0.00
0
0.00
37
0.16
0
0.00
44
0.17
0
0.00
0
0.00
76
1.14
397
1.52
24
0.10
385
1.70
0
0.00
177
0.68
0
0.00
0
0.00
1536
23.01
177
0.68
2510
10.85
1089
4.80
720
10.79
3885
14.87
13384
57.88
7263
32.02
19
0.28
0
0.00
732
3.17
52
0.23
0
0.00
0
0.00
0
0.00
52
0.23
0
0.00
88
0.34
0
0.00
52
0.23
0
0.00
132
0.51
0
0.00
0
0.00
19
0.28
1854
7.09
314
1.36
104
0.46
0
0.00
0
0.00
0
0.00
52
0.23
1156
17.32
3311
12.67
3555
15.37
5396
23.79
19
0.28
0
0.00
0
0.00
0
0.00
0
0.00
177
0.68
105
0.45
156
0.69
2294
34.37
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
0
0.00
104
0.46
436
6.53
3576
13.68
0
0.00
415
1.83
0
0.00
1236
4.73
209
0.90
0
0.00
19
0.28
4371
16.72
627
2.71
5966
26.31
95
1.42
397
1.52
941
4.07
0
0.00
6313
94.59
19381
74.16
22377
96.77
20701
91.27
6674

26135

23125

22680

1 i".
i%
£
f	CTv
w	yi
&	-**7
J?/


-------
SUMMARY OF WATER QUALITY DATA FOR THE CEDAR RIVER AND THE DISCHARGE CANAL AT THE
DUANE ARNOLD ENERGY CENTER FROM JANUARY THROUGH DECEMBER 1982
Location


1
2
3
4
1-4 »
5
General Water Duality







Temperature
(C)
Mean
Min-gax
11.6
0.0-27.9
24
11.6
0.0-27.6
24
12.2
0.0-28.1
24
11.7
0.0-27.7
24
11.8
0.0-28.1
96
21.1
0.3-30.5
24
Dissolved Oxygen
(¦8/1)
Mean
Min-Max
N
11.1
7.6-19.9
24
11.2
7.4-21.3
24
10.8
7.2-15.7
24
11.2
7.8-20.2
23
11.1
7.2-21.3
95
8.6
6.4-13.9
24
pH
(units)
Mean
Min-Max
N
7.9
7.0-6.5
24
7.9
7.0-8.5
24
7.9
7.1-8.5
24
7.9
7.1-8.5
24
7.9
7.0-8.5
96
7.9
6.9-8.7
24
Alkalinity, total
(ag/l-CaC03)
Mean
Min-Max
N
195
69-254
24
195
75-254
24
192
78-249
24
195
77-250
24
194
69-254
96
161
67-281
24
Alkalinity, carbonate
(wq/l-CaCOg)
Mean
Min-Max
N
1.3
0.0-10.0
24
0.9
0.0-14.0
24
1.1
0.0-14.0
24
1.5
0.0-14.0
24
1.2
0.0-14.0
96
2.3
00.0-30.0
24
Carbon l»1oxide
(i»g/l)
Mean
Min-Max
N
9.1
n.A-36.n
24
8.8
n.ft-3fi.n
24
8.7
1.0-36.0
24
8.2
1.0-36.0
24
8.7
0.8-36.0
96
4.5
0.9-14.0
24
Residue, ftitrable
(¦g/1)
Mean
Min-Max
N
381
inn-473
23
3fiO
m 7-4 fin
24
406
215-552
24
384
185-590
24
385
lR0-5«>0
95
651
338-1051
24
Turbidity
(MTU)
Mean
Min-Max
N
43
1.7-309
24
48
1.5-324
24
51
1.8-294
24
45
1.4-257
24
47
1.4-324
96
66
6.3-359
24
Residue, nonfiltrable
(¦g/1»
Mean
Min-Max
N
113
14-740
23
111
3-698
24
118
13-674
24
109
13-660
24
113
3-740
95
129
24-555
24
Residue, total
(¦g/l)
Mean
Min-Max
N
493
319-618
23
481
310-1044
24
524
322-1044
24
493
387-1034
24
498
310-1044
95
780
415-1155
24
Iron, total
(¦9/1)
Mean
Min-Max
N
1.03
0.02-9.0
24
1.72
0.03-8.6
24
2.22
0.03-11.2
24
2.14
<0.03-11.4
24
1.98
0.02-11.4
96
2.85
0.04-1*.4
24

-------
-67-
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T
7
Indicators of Contamination
Biochemical Oxygen	Mean
Demand	Hln-Hax
(S day) (*g/l)	N
Chemical Oxygen	Mean
Demand	Hi n-Hax
(•9/1)	*
Odor, threshold	Mean
(units)	Min-Max
N
Tannins and Ltgntns Mean
(•9/1)	N1 n-Hax
N
Trace Metals
Chromium, hexavalent Mean
(uo/H	Min-Max
N
Copwr, total	Mean
llig/11	Min-Max
N
Lead, total	Hean
(pq/1)	Mln-Hax
N
Mercury, total	Mean
(ug/11	Hln-Hax
N
Zinc, total	Mean
(wg/1)	M1 n-Max
K
5.1
4.3
1.2-11.0
<1-11.0
24
24
37.4
39.1
<10-90
<10-101
24
24
0.4
0.5
0-3
0-2
24
24
1.50
1.63
0.17-7.63
0.15-10.
24
24
<4
<4
3
3
0.7
4.0
2.2-20.7
2.4-5.7
3
3
5.B
5.9
<1-11.4
<1-10.3
3
3
<0.2
<0.2
3
3
0.02
0.03
0.01-0.03
0.01-0.(
3
3
(a) Pooled-river data for Locations 1 through 4.
(bj Number of determinations.
Location
1	T
5
4.5
1.2-10.5
24
4.6
1.2-14.1
24
4.6
<1-14.1
96
4.9
1.5-16.5
24
45.3
<10-111
24
45.5
<10-92
24
41.ft
<10-111
96
92.1
12-327
24
0.6
0-2
24
0.5
0-2
24
0.5
0-3
96
0.5
0-2
24
1.61
0.07*10.4
24
1.66
0.17-9.40
24
1.60
0.07-10.4
96
1.78
0.17-11.9
24

-------
Year
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
COMPARISON OF AVERAGE YEARLY VALUES FOR SEVERAL
PARAMETERS IN THE CEDAR RIVER UPSTREAM OF DAEC 1972-1982
san Flow
(cfs)
Turbidity
(NTU)
Total PO,
(mg/L)
Ammonia
(mg/L-N)
Nitrate
(mg/L-N)
BOD5
mg/L
4,418
22
1.10
0.56
0.23
5.7
7,900
28
0.84
0.36
1.5
4.0
5,580
29
2.10
0.17
4.2
4.7
4,206
58
1.08
0.33
2.8
6.5
2,082
41
0.25
0.25
2.8
7.3
1,393
15
0.33
0.52
2.9
6.5
3,709
23
0.26
0.22
4.4
3.3
7,041
26
0.29
0.12
6.6
2.5
4,523
40
0.34
0.19
5.4
4.3
3,610
33
0.77
0.24
6.0
6.5
7,252
43
0.56
0.23
8.0
5.1

-------
Year
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
SUMMARY OF RELATIVELY LOADING VALUES (AVERAGE ANNUAL CONC. X CUMULATIVE RUNOFF)
FOR SEVERAL PARAMETERS IN THE CEDAR RIVER UPSTREAM OF DAEC 1972-1982
•an Flow
(cfs)
Cum. Runoff
(in)
Turbidity
RELATIVE
Total PO^
LOADING VALUES
Ammonia
Nitrate
BOD
4,418
9.24
203
10.2
5.2
2
53
7,900
16.48
461
13.8
5.9
25
66
5,580
11.64
338
24.4
2.0
49
55
4,206
8.77
509
9.5
2.9
25
57
2,082
4.35
178
1.1
1.1
12
32
1,393
2.91
44
1.0
1.5
8
19
3,709
7.74
178
2.0
1.7
34
26
7,041
14.79
385
4.3
1.8
98
37
4,523
9.45
378
3.2
1.8
51
41
3,610
7.53
248
5.8
1.8
45
49
7,252
15.13
651
8.5
3.5
121
77

-------