HomeMy WebLinkAboutBradley River Water Quality Report 1992Alaska Energy Authority
Bradley River
Water Quality Report
1992
RECORU vOPY
FilE NO f>MT I -I I • I 0 3 3
BRADLEY LAKE
HYDROELECTRIC PROJECT
Federal Energy Regulatory Commission
Project No. P-8221-000
ALASKA ENERGY AUTHORITY
BRADLEY LAKE HYDROELECTRIC PROJECT
1992 BRADLEY RIVER WATER QUALITY REPORT
Prepared with
assistance from:
Northern Ecological Services
Anchorage, Alaska
December, 1992
TABLE OF CONTENTS
Page
INTRODUCTION. . • • . . • • . • • . • • • • . . • • • • . • • • • • • • . . • . • • • • • • • . . • . • • . . . . 1
METHODS • . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1
RESULTS •••••••••.• . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Riffle Reach .••
Tree Bar Reach.
North Fork •.••••
Miscellaneous Data.
.... . . . . . . . . . . . . . . . . . . . . . ....
2
2
2
2
3
RECOMMENDATIONS FOR FUTURE MONITORING •••.•••••••••••••••••••.•• 3
REFERENCES • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
i
LIST OF FIGURES
Page
Figure 1. Datapod locations, Bradley River ••.••••••••••••••••• 4
surface and Intragravel Water Temperature -Riffle Reach
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
December-1991 ••
January -1992 ••
February-1992 ••
March -1992 ••
April -1992.
May-1992 •••••••
June -1992 ••• . . . . . . . . . . . . . . . . . .
. . .
. . . . . ...
...
. . . . . . . . . . . .
July-1992 •••
August -1992.
September-1992 ••
october-1992 •••
November 1992 •• . . . . . . . . . . . . . . . . . . . .
December -1991 through November -1992 •• . . . . .
Surface and Intragravel Water Temperature Tree Bar Reach
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
December-1991 ••••
January-1992 ••••••••
February-1992 ••
April -1992.
May-1992 ••••
June 1992 •••••••••
. . . . .
. . . . . . . . .
... . . . . . . . . . .
. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
July-1992 •••
August-1992 ••
september-1992 •••
october-1992 •••••
November 1992 ••• . . . . . . . . . . . . . . . . . . . . . . . . . .
December -1991 through November 1992 ••••
surface Water Temperature Northfork
Figure 27. December -1991 •• . . . . . . . .
Figure 28. January -1992 •• . . . . . . . . . . .
Figure 29. February -1992 •• . . . . . . . . . . ....
Figure 30. August -1992 •••• . . . . . . . . . . . . ... . ...
Figure 31. September 1992. . . . . . . . . . . . . ...
Figure 32. october -1992 ••• •• . . . . . . . . . . . .... . .....
Figure 33. November 1992 •• ...... . . . . . . . . . . . . ....... . . . .
Figure 34. December -1991 through November -1992 •• . . . . ..
ii
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
32
33
34
35
36
37
LIST OF TABLES
Table 1. surface water temperature and turbidity measurements
collected during the Salmon Escapement Monitoring
Page
Study downstream from Riffle Reach •.......•.••....... 38
iii
INTRODUCTION
The purpose of this report is to comply with Article 3 3 of the
Federal Energy Regulatory Commission (FERC) License which states
that a water quality monitoring program must be developed to
evaluate water temperatures in the lower Bradley River and heavy
metal and hydrogen sulfide concentration in Bradley Lake.
The monitoring program was developed and presented in the Bradley
Lake mitigation plan published in November 1985 (Alaska Energy
Authority, 1985). This is the seventh annual progress report and
covers water quality data collected during the period -December
1991 through November 1992.
In~ormation presented includes intragravel and surface water
temperatures in the Bradley River and surface water temperatures
in the North Fork of the Bradley River. Also included are surface
water temperature and turbidity measurements collected at the
Bradley River fish camp by the fisheries study crew during the July
to September period. '
The Bradley Lake Hydroelectric facility began operation in the fall
of 1991 and was operational during the period of this study.
Discharge volumes in the Bradley River during the 1992 water
quality monitoring period were characteristic of operational flows.
This annual report is the second to report on water quality during
the operational flow regime.
METHODS
surface and intragravel water temperatures continued to be
collected at two-hour intervals utilizing Model DP212 Omnidata
Datapod digital recorders as described in the 1988 Annual Water
Quality Report (Alaska Power Authority, 1988). Figure 1 depicts
the locations of the temperature stations during 1991.
The data pods were serviced at approximately monthly intervals.
Some variation in servicing interval occurred because of weather
limitations. The longest period between servicing was
approximately 5 weeks.
Additional surface water temperature and turbidity data were
collected during the mid-July to mid-September period by field
personnel associated with the Salmon Escapement Monitoring Study.
This information was collected at the fish camp which is about 150
ft. downstream from the Tree Bar Reach datapod station.
Temperature readings were always collected at 8:00 am. Turbidity
was usually measured in mid-afternoon.
1
RESULTS
The intragravel and surface water temperature data for December
1991 through November 1992 are presented in graphic form by month
and by study site. An annual graph has also been produced for each
study site. The monthly graphs were prepared using a computer
program which plots each of the 2 hour temperature readings
obtained from the datapods. The annual graphs were prepared by
computing the average daily temperature from the 12 daily
temperature readings and plotting the average daily temperature for
each day of the December to November period. Complete printouts
of the data are not presented here due to their bulk, but are
available upon request from the Alaska Energy Authority.
Riffle Reach
The record for Riffle Reach contains several gaps. All of the
daeapod units were affected by heavy snow and moisture in March
and, consequently, no data are available for March because of
datapod malfunction. In addition, the surface water probe was
damaged, probably due to ice movement in late March. The probe was
finally replaced successfully in August, resulting in the loss of•
surface water data from April through July; the intragravel
temperature probe did, however, function during this time.
Additional data were lost in September due to an unknown
malfunction in the datapod.
Graphs of the surface and intragravel water temperatures for the
months December, 1991 through November, 1992 are presented in
Figures 2 through 13 and the annual temperature record is presented
in Figure 14. The general trends observed were similar to those
seen in 1991.
Tree Bar Reach
The temperature record for Tree Bar Reach is complete except for
datapod malfunctions which occurred in March-April and part of
October.
Graphs of the surface and intragravel water temperature for the
months December through November (excluding March) are presented
in Figures 15 through 25 and the annual temperature record for the
full period December through November is presented in Figure 26.
North Fork of the Bradley River
The datapod at the North Fork monitoring site was buried under deep
snow and was not accessible in February and March. The non-
functioning unit was removed in late March, dried out and
reinstalled in late April. However, it continued to malfunction
and was returned to the dealer for repairs. It was reinstalled in
July but no usable data were obtained until August, apparently
2
because of problems with the data storage module. No data were
obtained during the time period from mid-February through mid-
August.
Graphs of the surface water temperature for the months December
through February and August through November are presented in
Figures 27 through 33 and the annual record is presented in Figure
34.
Miscellaneous Data
Surface water temperature and turbidity data collected during the
1992 Salmon Escapement Monitoring Program at the fish camp near
Tree Bar Reach are presented in Table 1.
RECOMMENDATIONS FOR FUTURE MONITORING
Water temperatures will continue to be monitored from Riffle Reach,
Tree Bar Reach and the North Fork of the Bradley River. Datapod
servicing frequency will continue to be once per month. Greater
effort will be made to anticipate datapod problems to increase the
success of data retrieval. Because several individuals are
involved in the retrieval and analysis of temperature data, a•
protocol will be developed to standardize and improve servicing
procedures and coordination between participants.
Water quality monitoring for heavy metal and hydrogen sulfide
concentrations in the Bradley Lake reservoir will be initiated in
the summer of 1993. Reservoir water chemistry data will be
collected in 1993 and again in 1995. No hydrogen sulfide smell was
noted by project staff working in the vicinity of the Bradley Lake
reservoir in 1992.
It is currently planned to prepare a final summary report in 1995
which summarizes pre-operational and post-operational water quality
data and addresses both water quality and fisheries concerns as
they may be related to the operation of the Bradley Lake
Hydroelectric Project.
REFERENCES
Alaska Power Authority, 1985. Mitigation Plan for the Bradley Lake
Hydroelectric Project. Prepared by stone & Webster Engineering
Corporation.
Alaska Power Authority, 1988. Bradley River Water Quality Report-
1988. Bradley lake Hydroelectric Project, Federal Energy
Regulatory Commission Project No. P-8221.
3
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SURFACE & INTRAGRAVEL WATER TEMPERATURE
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FIGURE 3: RIFFLE REACH-JANUARY, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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FIGURE 4: RIFFLE REACH-FEBRUARY, 1992
SURFACE & INTAAGRAVEL WATER TEMPERATURE
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FIGURE 5: RIFFLE REACH-MARCH, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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FIGURE 6: RIFFLE REACH-APRIL, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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FIGURE 7: RIFFLE REACH-MAY, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~--------------------------------------------------------~
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FIGURE 8: RIFFLE REACH-JUNE, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
8
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FIGURE 9: RIFFLE REACH-JULY, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
10 -·---··-..:---. ________ : __ ...... .,....-
9~····· .. ·····
4
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10 JULY,1~ 20 ~5 5
1-SURFACE TEMPERATUREU:.:: ....... INTRAGRAVEL TEMP. -.. ]
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FIGURE 10: RIFFLE REACH-AUGUST, 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
10.---------------------------------------------------------~
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FIGURE 13: RIFFLE REACH-NOVEM., 1992
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FIGURE 23: TREEBAR REACH-SEPT., 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
5 I I
10 SEPTEMB'I::'h, 1992
1-SURFACE TEMPERATURE .... -.==!NTRAGRAVEL TEMP. ]
I
20 ~5
FIGURE 24: TREEBAR REACH-OCT., 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~------------------------------------------------------~
sw········
0 m 4--l/·····-·--·-········· ~ ---.. ····-······-···-·--···-··································-····-··-·········-···················-.. ·-··-···-······························-······-···----····---······· .. ·-·····-···-····················-······· ............ .
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0~------------------------------------------------------~
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10 OCTOBE\l. 1992 20 ~5
l===SURFACE-TEMPERATURE ........... INTRAGRAVELTEMP: -.,
FIGURE 25: TREEBAR REACH-NOV., 1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6~-------------------------------------------------------,
5-t ........................................................................................................................................................................................................................................................................................ .
.
~ 4-+-........................................................................................................................................................................................................ . w w a:
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10 NOVEMB~~' 1992 20 ~5
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FIGURE 26: TREE BAR REACH-1992
SURFACE & INTRAGRAVEL WATER TEMPERATURE
10~--------------------------~--------~
:'il
8~--------------hl/'fl~~:N
w·: ~~v ~r 6~-................................................................................................................................................................................. f/-············ .. ···········································tV···············
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DECEMBER, 1991 THROUGH NOVEMBER, 1992
1-SURFACE TEMPERATURE .............. INTRAGRAVEL TEMP. I
0
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FIGURE 27: NORTH FORK-DECEMBER, 1991
SURFACE WATER TEMPERATURE
2~--------------------------------------------------------~
1.5---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------··-····································
w 1---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------··············· a:
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10 DECEMB~. 1991 20
[--SURFAcE TEMPERATURE I
0
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FIGURE 28: NORTH FORK-JANUARY, 1992
SURFACE WATER TEMPERATURE
2~--------------------------------------------------------~
1.5
w 11·············· .. ······· .. ·································································································--·--············--····----······················· .. ····················----········ .. ······ .. ····· ............................................................................ ..
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1
10 JANUAR~ 1992 20 ~5 5
1-SURFACE TEMPERATURE-~
FIGURE 29: NORTH FORK-FEBRUARY, 1992
SURFACE WATER TEMPERATURE
2~------------------------------------------------------~
1~, ......................................................................................................................................................................................................................................................................................................... ..
d 1-·············--·····················································"""''''·····"············· ................................................................................................................................................................................................................ .
i 0.5--· ··-····-········ ···-······-········-·---···························· . ------·-·-.... -·· .. . . ····-·-·· . ·············-.. --..... ...... . . ....... -..... -
w
0
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c:: w:::>
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1° FEBRUA~V. 1992 20 ~5 5
1-SURFACE TEMPERATURE]
FIGURE 30: NORTH FORK-AUGUST, 1992
SURFACE WATER TEMPERATURE
9~--------------------------------------------------------~
8--l·························································································································································································
0 7--······································································································································································································································································•···•··•····•···•····•···•·······•·•··
en w
~ 6--·················································································································································································································································································································
(!) w c 5--l············································································································································································································································ .. ······ .. ························ .. ············
I
w a: w :::> 4--l···················································································································································································································
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::E w
1--2--·················································································································································································································································································································
1 ..................................................................................................................................................................................................................................................................................................................... .
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AUGUSl~1992 20 ~5 5
1-SURFACE TEMPERATURE]
0
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FIGURE 31: NORTH FORK-SEPTEMBER, 1992
SURFACE WATER TEMPERATURE
8~--------------------------------------------------------~
7 --l····l··\·······A······l-1-··············l-~·················1·1·······1·+························································.,..··································································································
w s~·-····························································~·-1·····-~~---············1·························1··························1··············· a:
(!) w
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10 SEPTEMBl=ll. 1992 20 ~5 5
f-SURFACE TEMPERATURE I
0
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FIGURE 32: NORTH FORK-OCTOBER, 1992
SURFACE WATER TEMPERATURE
6~--------------------------------------------------------~
5-4·····················································1-+··················································································································································································································································
:::IE 1 -4··························································································-\·1····\-·····1·············\·····n-1·················+··············································
w .....
0~----------------------------~tx==~~--------------~~
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OCTOB&. 1992 20 ~5 5
1-SURFACE -TEMPERATURE I
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FIGURE 33: NORTH FORK-NOVEMBER, 1992
SURFACE WATER TEMPERATURE
2~--------------------------------------------------------~
1.5-+·························································································································· .. ··········································································································································································
w 1--································································-····-··-·•·•··································-·······································-············································································· a:
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-1 ~ ••• ,. anlllllll•llll•llll•n••IIBIIIIIIIIIIIIBIIIIIIIIIIIDiaiiiNIII•n••IIIIIIIIAIIIII• ' ~ 0 NOVEMB~~. 1992 •••~•,.••,.••••••••J;•""'""•••••IIn 5
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FIGURE 34: NORTH FORK BRADLEY R.-1992
SURFACE WATER TEMPERATURE
8~--------------------------------------------------------~
7-+······································-·························-···························································
6-1·······································-······························-·········································································································································································f······H~·-·
5 -1·····································-·-········································-·-······························································································································································+II·HII·······························································I
4 -1·······································-··········································································································································································································ltJf·fl··············-l········································
3--1·······································-··········································································································································································································l·······•··········h
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1
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-------I ---I ----._ -----•• I --· _..... -_.,._ -~...... ... .. -...
DECEMBER, 1991 THROUGH NOVEMBER, 1992
1-SURFACE-TEMPERATURE-.............. INTRAGRAVEL TEMP. I
TABLE 1
surface water temperature and turbidity measurements collected
during the Salmon Escapement Monitoring Study downstream from Tree
Bar Reach.
~ Temperature (c.) Turbidity (NTU)
July 15 8.3 22
July 16 10.0 24
July 21 8.5 17
July 22 8.2 16
July 23 7.6 17
Ju],y 28 8.8 27
July 29 7.8 24
July 30 7.9 34
Aug. 4 9.2 19
Aug. 5 7.8 10
Aug. 6 8.8 32
Aug. 11 9.4 36
Aug. 12 9.2 40
Aug. 13 8.6 40
Aug. 18 8.2 58
Aug. 19 8.4 45
Aug. 20 9.0 48
Aug. 25 7.8 46
Aug. 26 8.1 40
Aug. 27 7.4 62
Sep. 1 7.6 84
Sep. 2 7.5 74
Sep. 3 7.2 73
Sep. 8 7.4 76
Sep. 9 7.1
Sep. 10 5.4 75
38