WORKING PAPER NO.    17
                      COLUMBIA RIVER BASIN PROJECT
             For Water Supply and Water Quality Management
             DETERMINATION OF DEOXYGENATION COEFFICIENTS
                         WILLAMETTE RIVER
                            SUMMER 1961
                                          DISTRIBUTION

Prepared by _   ENK                        Project Staff   X

Reviewed by _   JLA                        Cooperating Agencies	X_

Approved by _   WWT                        General 	
           U. S. DEPARTMENT OF HEALTH, EDUCATION AND WELFARE
                         Public Health Service
                               Region IX

            Division of Water Supply and Pollution Control
                           570 Pittock Block
                           Portland 5, Oregon

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This working paper contains  preliminary data  and information




primarily intended for internal  use by the  Columbia Rivet




Basin Project staff and cooperating agencies.  The material




presented in this paper has  not  been fully  evaluated and




should not be considered as  final.

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               DETERMINATION OF DEOXYGENATION COEFFICIENTS
              AT CRITICAL LOCATIONS IN THE WILLAMETTE RIVER
INTRODUCTIONS
     In determining the waste assimilative capacity of streams within
the Willamette Basin, one of the primary consideratiqns was determi-
nation of the deoxygenation coefficients (k^) for critical locations
within the basin.  During the summer of 1961 two graduate sanitary en-
gineering students from Oregon State University were employed princi-
pally to collect and analyze river samples for the determination of
kj_.  Nine sampling stations were selected within the basin, seven on
the main stem Willamette and two on tributary streams.  These stations
were located from river mile 7, near the mouth, to river mile 178 at
Eugene.

SUMMARY

     The deoxygenation coefficient (k,*s) determined during the survey,
were within the range that would be expected of the waters that were
sampled.  Changes in the rate of biochemical oxygen utilization were
noted to vary with variations in the type and strength of the wastes
that were being indirectly measured, and the relative quality of the
waters being measured.

     The background BOD of the Willamette River throughout the major-
ity of its length is quite low.  Conventional BOD time series of these
waters would result in attempting to establish a rate for a very in-
significant change in the total dissolved oxygen.  In order to obtain
the river kj, and resultant assimilative capacity, it was necessary to
either obtain a sample of a characteristic waste and dilute this with
river water from the area of waste discharge, or to obtain the sample
from the river directly below a major waste source where a significant
BOD would be present.  A decision was made to sample the stream directly
below the major waste source rather than the waste itself, and dilute
it to a predetermined strength.  It was felt this procedure would more
closely approximate that which took place in the river under natural
conditions.

     It will be noted on the data sheets that a few of the river sam-
ples were diluted.  This was done to maintain the ultimate BOD in the
sample somewhere below 100 parts per million, which through experience,
was found to be the best range with which to work.

LABORATORY METHOD UTILIZED

     The method utilized in setting up the BOD time series was a modi-
fication of the reaeration technique used at the Robert A. Taft Sani-
tary Engineering Center in Cincinnati.

     A three-gallon river sample was collected for each time series.
The temperature of  the sample  at  the  time of collection was recorded

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and the sample was then transported to the laboratory.  While in tran-
sit, attempts were made to maintain this sample at the initial river
temperature.  Samples were iced only when temperatures were extremely
high.  When the sample reached the laboratory, the temperature was
again recorded.  The maximum allowable time in transit between the
time of collection and sample set-up, was three hours.  30 to 32 BOD
bottles were then filled from the three-gallon sample.  Two duplicate
dissolved oxygen determinations were made immediately upon filling of
the bottles and the remaining bottles were placed in a dark incubator
and held at 20°C.  Following this, two bottles were taken from the in-
cubator and analyzed for dissolved oxygen at the end of 1, 2, 3, 4, 5,
7, 9, 11, 13, 15, and 20 days.  If at the end of any given day it ap-
peared that the remaining dissolved oxygen in the remaining samples
would be depleted before the next set were analyzed, all remaining
samples were then reaerated by emptying them into a large container
and shaken until the dissolved oxygen was built up to six or seven
parts per million.  The bottles were then re-filled from the container
and two were immediately analyzed for a new initial dissolved oxygen
value and remaining bottles were again placed in the dark incubator.

SAMPLING STATIONS LOCATIONS

No. 1:  McKenzie River at R.M. 11.5 - directly below Weyerhaeuser-
          Springfield pulp and paper mill outfall.
No. 2:  The Willamette River at R.M. 178.0 - downstream from the City
          of Eugene's sewage treatment plant outfall, but above the
          confluence with the McKenzie.
No. 3:  South Santiam River near Lebanon at R.M. 27.0 and 18.3 - just
          downstream from the City of Lebanon's sewage treatment plant
          outfall, and the outfall from the Crown Zellerbach-Lebanon
          pulp and paper mill.
No. 4:  Willamette River near Salem at R.M. 82.0 - approximately one
          mile below the City of Salem"s sewage treatment plant out-
          fall and two and a half miles below the Oregon Pulp and
          Paper mill outfall.
No. 5:  Willamette River near Newberg at R.M. 48.0 - some two miles
          below the Newberg sewage treatment plant outfall and
          Spaulding Palp and Paper Co. outfall.
No. 6:  Willamette River near Oregon City at R.M. 25.0 - one mile below
          Willamette Falls and Crown Zellerbach and Publisher Pulp and
          Paper companies.
No. 7:  Willamette River at Staff Jennings at R.M. 16.5 - in the upper
          Portland harbor.
No. 8:  Willamette River at the Steel Bridge at R.M. 12.0 - in Portland
          harbor.
No. 9:  Willamette River at the SP&S Railroad Bridge at R.M. 7.0 - in
          the lower Portland harbor.

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VICINITY  MAP  '2I'.30'

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METHOD USED IN COMPUTING kt FROM BOD DATA (This method was developed by
Dr. E. C. Tsivoglou at Robert A. Taft Sanitary Engineering Center in
Cincinnati, Ohio.)

     From the dissolved oxygen data obtained from each of the samples,
BOD's were computed for each of the 1, 2, 3, etc., days.  The BOD was
computed for each of the duplicate DO's of each day and averaged if
they were comparable.  If the duplicate BOD's varied considerably, each
value was plotted.  The BOD was then plotted against time, in days, for
the first stage of the BOD, usually to 10 days.  (Figure 1)  The plotted
points were then fitted visually with a smooth curve of best fit.  Fol-
lowing this, the BOD's were read from the fitted smooth curve at daily
intervals and tabulated in the following example:

                              STATION NO. 2
                                 9-11-61
                                                        Daily
            Days                   BOD               Differences
                                   (Y)                   (AY)
             0
                                                         4.0
             1                     4.0
                                                         2.9
             2                     6.9
                                                         2.0
             3                     8.9
                                                         1.3
             4                    10.2
                                                         0.8
             5                    11.0
                                                         0.7
             6                    11.7
                                                         0.4
             7                    12.1
     The daily differences in BOD were then obtained from this tabu-
lation and plotted on semi-log paper against time in days, with dif-
ferences on log scale, time on the linear scale (Figure 2).  Extend-
ing the line through the points to T=0 gives a proportional value for the
ultimate BOD (L) of 5.80.  Therefore, with T equal to 6 days:

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Station
No.
1
2
3
4
5
6
7
8
9
L . 0.585 fraction remaining = 10.1%
T/L 5.80
From LJ/L = 10K^ = fraction remaining
LT/L x 10° ° !0KT x 10 = percent remaining
Log of percent remaining = log (lO1^ x 10)
Log percent BOD remaining ** 2 - k^t
If t = 6, 7. BOD remaining = 10.1, then
Log 10.1 = 2 - kx6
i
k, = 2.0-log 10.1
1 6
k = 0.166/day
WILLAMETTE RIVER BASIN
k! DETERMINATIONS - 1961

Date
6-22 6-27 7-12 8-2 8-7 8-9 7-26 9-11
0.175 0.134
0.130 0.0595** 0.167
0.163 0.118 *
0.187 0.140 0.168 0.148
0.139
0.160 0.157
0.117
0.123
0.0984















Average
0.154
0.148
0.140
0.160
0.139
0.158
0.117
0.123
0.0984
*   Sample taken on this date, but results erratic and not meaningful.




**  Ultimate BOD (La) very low.

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,0
                                                       10

-------

*•
5  3
I-
O. I
         3  4-
         —T»

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  LONG TERM BOD DATA
WILLAMETTE RIVER - 1961

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                       DATA SHEET - LONG TERM BOD'S

Station:    No. 1 - McKenzie River

Date:   	6-22-61                     Crew:
Sampling Time:   9;1° a"m-
Setup Time:     12;30 p.m.
Temperature:     18° C.

Temperature:     21° c.
Day
Initia
1
*2
3
4
*
6
7
9
11
13
15
20
Date
6-22
6-23
reaera
6-24
6-25
6-26
reaerat
6-27

6-29
7-1
7-3
7-5

7-12
Time


ed


ed







DO (ppm)
No, 1 i No. 2
8.5
3.2
6.5
3.8
2.3
0.8
7.8
6.3

4.75
4.25
2.27
1.70

0.3
8.7
2.8
6.5
3.9
2.1
0.8
7.7
6.4

5.0
1.8
1.21


0.3
DO (ppm)
(Average)
8.6
3.0
6.5
3.85
2.2
0.8
7.75
6.35

4.87
3.02
1.74


0.3
BOD
(ppm) r

5.6
8.25
9.9
11.3
12.7

14.15
16.0
17.3


18.9
Comments:
  K! = 0.175/day

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                       DATA SHEET - LONG TERM BOD'S

Station:   No. 1 - McKenzie River

Date:      9-11-61                      Crew:
Sampling Time:   3:15 p.m.

Setup Time:      5:45 p.m.
             Temperature:

             Temperature:
                   21.5° C.
                   23° C.

Day
Inltia
1
2
3
4

5
6
7
9
11
13
15
20

Date
9-11
9-12
9-13
9-14
:eaerat<
9-15
teaeratc
9-16

9-18
9-20
9-22
9-24
9-26
10-1

Time




d

d







DO
No, 1
7.9
4.6
3.5
1.1
6.4
2.9
7.5
5.2

3.6
_ _2^L_ _
7.2
5.2

3.7
-
Cppm)
No. 2
8.1
4.7
3.5
1.0
6.2
" ~ 3.T ~ •
7.6
5.2

3.6
. _ 1.1 _ .
5.0

3.7

DO (ppm)
(Average)
8.0
4.7
3.5
1.1
6.3
	 370- ~
7.6
5.2

3.6
_ _U9_ _
7.0
5.1

3.7

BOD
(ppm) ,

3.4
4.5
7.0

10.3
12.6

14.2
15.9
17.9

19.4

   21    10-2
Comments:
  KL - 0.134/day
1.5
1.8
1.65
21.45
  bottom tray north

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                       DATA SHEET - LONG TERM BOD'S
Station:  No« 2 ~ Willamette River



Date:     7-12-61	




Sampling Time:   4:30 P*m.	




Setup Time:
                       Crew;
5:30 p.m.
Temperature:     19.5°  C.



Temperature:     24.5   C.
Day
Inltia
1
2
3
4
5
6
7
9
11
13
15
20
Date
7-12
7-13
7-14
7-15
7-16
7-17

7-19
7-21
7-23
7-25
7-27
8-1
Time













DO (ppm)
No, 1
8.7
7.9
7.4
6.5
6.2
5.7

5.1
4.9
4.1
4.2
3.8
3.1
No. 2
8.9
8.1
7.3
6.5
6.0
- -

5.4
4.9
4.2
3.6
3.9
3.1
DO (ppm)
(Average)
8.8
8.0
7.35
6.5
6.0
5.7

5.25
4.9
4.15
3.9
3.85
3.1
BOD
(ppm)

0.8
1.45
2.3
2.7
3.0

3.55
3.9
4.65
4.9
4.95
5.7
Comments:




KL = 0.130/day

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                        DATA SHEET - LONG TERM BOD'S

 Station: No.  2  - Willamette  River

 Date:    8-7-61                        Crew:
 Sampling Time:    10:55 a.m.

 Setup Time:  	1:30 p.m.
Temperature:    16
Temperature:    18° C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
8-7
8-8
8-9
8-10
8-11
8-12

8-14
8-16
8-18
8-20
8-22
8-27
Tina













DO (ppm)
No, 1
9.1
8.9
8.8
8.6

8.3

7.9
7.8
7.6
7.0
7.1
7.0
No. 2
9.3
9.3
8.9
8.7

8.2

7.7
7.8
7.6
7.0
7.0
6.9
DO (ppm)
(Average)
9.2
9.1
8.9
8.7

8.2

7.8
7.8
7.6
7.0
7.0
7.0
BOD
(ppm)
0.1
0.2
0.5
0.7

1.1

1.5

1.7
2.3
2.3
2.4
 Comments:

 DO's taken at 1:15 p.m.
 No dilution.
Kj_ « 0.0595/day

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                       DATA SHEET - LONG TERM BOD'S
Station:   No.  2 - Willamette River

Date:   9-11-61	

Sampling Time:   3:45 p.m.	
             Crew:
              Temperature:   19°C.
Setup Time:     5; 50 p.m.
              Temperature:   20°C.
Day
Initla
1
2
3
4
5
6
7
9
11
13
15
20
Date
9-11
9-12
9-13
:eaerat<
9-14
9-15
9-16

9-18
9-20
9-22

9-26

Time



d









DO (ppin)
No, 1
9.4
5.7
2.7
7.9
5.6
4.4
3.6

2.6
2.0
8.1
7.2

5.3

No0 2
9.4
5.5
2.6
7.9
5.5
4.6
3.6

2.4
1.9
8.1
7.0

5.1

DO (ppm)
(Average)
9.4
5.6
2.7
7.9
5.6
4.5
3.6

2.5
2.0
8.1
7.1

5.2

BOD
(ppm)

3.8
6.8
9.1
10.2
11.0

12.2
12.7
13.7

15.6

    21    10-2
Comments:

Middle  tray north

Kt  - 0.167/day
3.4
3.3
3.4
17.5

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                       DATA SHEET - LONG TERM BOD'S



Station:  No. 3 - South Santiam River




Date:     6-27-61                       Crew:
Sampling Time:   12;15 p.m.



Setup Time: 	1:40 p.m.
Temperature:    21° c.



Temperature:    21° c.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
6-27
6-28
6-29
6-30
•eaeratc
7-1
7-2

7-4
7-6
7-8
7-10
7-12
7-17
Time




d








DO (epin)
No, 1
7.9
5.04
2.90
1.77
7.38
6.31
5.74

4.83
4.53
3.33
1.56
0.20

No0 2
8.0
5.04
3.0
1.92
7.09
6.31
5.45

4.86
4.46
3.05
1.50
0.20

DO (ppm)
(Average)
7.95
5.04
2.95
1.84
7.23
6.31
5.59

4.84
4.49
3.19
1.53
0.20

BOD
(ppm)

28.9
49.8
60.8
70.0
77.2

84.7
88.2
101.2
117.8
133.0

Comments;




1 in 10 dilution



K  = 0.163/day

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                       DATA SHEET - LONG TERM BOD'S

Station:  No.  3 — ^antiam, ftiver

Date:     8-7-61	_	    Crew: 	
Sampling Time:    12;25 p.m.

Setup Time: 	1;45 p.m.
Temperature:  ,_ 22   c.
Temperature:    23° C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
te ratio
8-7
8-8
8-9
8-10
8-11
8-12

8-14
reaerate
8-16
8-18
8-20
8-22
8-27
Time








d




DO (ppm)
No, 1
5.8
6.5
6.3
5.8
5.0

3.7

3.0
8.0
2.5
6.9
6.2
6.1
5.6
No. 2
5.7
6.6
6.4
5.9
5.3

3.8

2.8
7.9
2.4
6.8
6.1
6.3
5.6
DO (ppm)
(Average)
5.8
6.6
6.4
5.9
5.2

3.8

2.9
8.0
2.5
6.9
6.2
6.2
5.6
BOD
(ppm)

0.2
0.7
1.4

2.8

3.7
4.1
5.2
5.9
5.9
6.5
Comments:
DO's taken at 1:15 p.m. DST
No dilution.
Sample was taken at bridge near Crabtree.
KL = 0.118/day

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                       DATA SHEET - LONG TERM BOD'S
Station:  No. 3  - Santiam River

Date:     9-11-61	

Sampling Time:    4;55 p.m.

Setup Time: 	5:50 p.m.
              Crew:
              Temperature:    21  c.
              Temperature:    21.5° C.
Day
Inltla
1
2
3
4
5
6
7
9
11
13
15
20
Date
9-11
9-12
9-13
9-14
9-15
9-16

9-18
9-20
9-22
9-24
9-26

Time













DO (ppm)
No, 1
8.8
8.5
8.2
7.8
7.3
6.5

6.0
4.9
4.1

3.1

No. 2
8.8
8.7
8.2
7.8
7.4
6.4

5.8
4.9
4.3

3.3

DO (ppm)
(Average)
8.8
8.6
8.2
7.8
7.4
6.5

5.9
4.9
4.2

3.2

BOD
(ppm)

0.2
0.6
1.0
1.5
2.4

2.9
3.9
4.6

5.6

   21   10.2
Comments:
2.8
2.7
2.8
6.1
3/4(X) = 1st days readings.
1st day BOD actually = 2.7.
Top tray north.
KI =   Sample taken, but results erratic and not meaningful.

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                       DATA SHEET- LONG TERM BOD'S

Station:  ^°°  ** ~ Willamette River
Date:
          7-26-61
Crew:
Sampling Time:    11:00  a.m.

Setup Time: 	1:30  p.m.
Temperature:   21  C.
Temperature:   22  C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
7-26
7-27
7-28
7-29
7-30
7-31

8-2
8-4
8-6
8-8
8-10
8-15
Time













DO (ppm)
No. 1
8.6
7.7
7.8
6.9
6.5
6.5

6.3
5.9
5.3
4.9
5.1
4.4
No. 2
8.3
7.4
7.4
6.8
6.5
6.3

6.2
5.6
5.2
4.8
4,8
4.3
DO (ppm)
(Average)
8.5
7.6
7.6
6.9
6.5
6.4

6.3
5.8
5.3
4.9
5.0
4.4
BOD
(ppm)

9
9
16
20
21

22
27
32
36
35
41
Comments:

DO's  taken at 1:15 p.m.
Dilution factor - 1 in 10
KL «   0.168/day

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                       DATA SHEET - LONG TERM BOD'S
Station:  No. 4 - Willamette River
Date:     6-22-61	
Sampling Time:    4:30 p.m.
Setup Time:       5;40 p.m.	
Crew:
Temperature:   20.5  Ci
Temperature:   22.5° c.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20 '
Date
6-22
6-23
reaerat
6-24
6-25
6-26
reaerat*
6-27

6-29
7-1
7-3
reaerati
7-5
7-7
7-12
Tine


d


d




d


DO (ppta)
No, 1
7.1
2.9
7.5
3.2
2.4
1.3
7.8
6.3

4.9
3.2
0.5
7.04
2.9

1.1
No. 2
7.2
2.8
7.4
3.9
2.1
1.5
7.7
5.70

5.1
2.9
0.5
7.65
2.9

0.6
DO (ppm)
(Average)
7.15
2.85
7.45
3.55
2.25
1.40
7.75
6.00

5.0
3.05
0.5
7.34
2.9

0.85
BOD
(ppm) t

4.3
8.2
9.5
10.35
12.1

13.1
15.05
17.6
22.0

24.05
Comments:
K  m  0.187/day

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                       DATA SHEET - LONG TERM BOD'S
Station:  No.  5 - Willamette River

Date:     7-12-61	

Sampling Tine:    10:50 a.m.	

Setup Time: 	1:50 p.m.	
Crew:
Temperature:   24° c.
Temperature:   26.5° C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
DaSfe
7-12
7-13
7-14
7-15
7-16
7-17

7-19
7-21
7-23
7-25
7-27
8-1
Tims













DO (ppm)
Ho, 1
7.8
7.0
6.5
6.4
6.0
5.5

5.4
5.4
5.0
4.5
4.4
3.8
No. 2
8.0
7.1
6.6
6.4
6.2
5.7

5.5
5.4
4.9
4.9
4.4
4.0
DO (ppm)
(Average)
7.9
7.05
6.55
6.4
6.1
5.6

5.45
5.4
4.95
4.7
4.4
3.9
BOD
(ppm)

4.0
6.5
7.25
8.75
11.25

12.0
12.25
14.5
15.5
17.0
19.5
Comments:
Dilution factor - 1 in 5
K  -  0.139/day

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                       DATA SHEET - LONG TERM BOD'S

Station:  No. 6 - Willamette River

Date:     8-2-61                        Crew:
Sampling Time:    2; 30 p.m.

Setup Time: 	4:40 p.m.
Temperature:
Temperature: _._..24.5° C.
Day
Initia
I
2
3
4
5
6
7
9
I-
11
13
15
20
Date
8-2-6
8-3
8-4
8-5
8-6
8-7

8-9
eaeratc
8-11
8-13
8-15
8-17
8-22
Time








d




DO (ppm)
No, 1
7.5
5.7
4.8
4.0
2.6
2.9

2.9
2.1
8.2
7.2
7.1
6.4
5.7
No. 2
7.5
5.6
4.8
4.2
3.3
2.9

2.6
2.1
8.3
7.2
7.4
6.5
5.8
DO (ppm)
(Average)
7.5
5.5
4.8
4.1
3.0
2.9

2.8
2.1
8.3
7.2
7.3
6.5
5.8
BOD
(ppm)

1.8
2.7
3.4
4.6
4.6

4.8
5.4
6.5
6.4
7.2
7.9
Comments:

DO's taken at 1:15 p.m.
No dilution.
K- =  0.160/day

-------
                       DATA SHEET - LONG TERM BOD'S
Station:  No.  6 — Willamette  River
Date:     9-11-61	
Sampling Time:   10:10  a.m.	
Setup Time:      12:50  p.m.	
Crew:
Temperature:     18.5° C>
Temperature:     19.0° C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
9-11
9-12
9-13
9-14
9-15
9-16

9-18
9-20
9-22
9-24
9-26
10-2
Tim<2













DO (ppm)
No, 1
8.2
7.2
6.3
5.5
5.2
4.8

4.6
4.1
3.8

3.2
2.4
No, 2
8.2
7.3
6.1
5.4
5.0
4.4
•
4.5
4.1
3.9

3.4
2.5
DO (ppm)
(Average)
8.2
7.3
6.2
5.5
5.1
4.6

4.6
4.1
3.9

3.3
2.5
BOD
(ppm) r

1.0
2.0
2.8
3.1
3.6

3.7
4.1
4.3

4.9
5.8
Comments:
Kx =  0.157/day

-------
                       DATA SHEET - LONG TERM BOD'S



Station:  No. 7 - Willamette River




Date: 	8-9-61                        Crew:
Sampling Time:
.   2:30 p.m.
                           Temperature:
Setup Time:     4:5° P'm-
                           Temperature:     24  C.
Day
Inltla
1
2
3
4
5
6
7
9
11
13
15
20
Date
8-9
8-10
8-11
8-12
8-13
8-14

8-16
8-18
8-20
8-22
8-24
8-29
Time













DO (ppra)
No, 1
7.94
7.52
». 23
6.75
6.45
6.33

6.16
5.82
5.85
5.13
4.60
3.45
No. 2
7.94
7.43
7.17
6.80
6.60
6.35

6.04
5.68
5.70
5.06
5.10
3.15
DO (ppm)
(Average)
7.94
7.48
7.20
6.78
6.53
6.34

6.10
5.75
5.78
5.10
4.85
3.30
BOD
(ppm) ^

0.47
0.74
1.17
1.42
1.60

1.84
2.19
2.17
2.85
3.09
4.64
Comments:




K! o  0.117/ day

-------
                       DATA SHEET - LONG TERM BOD'S



Station:  No.  8 -Willamette River




Date:     8-9-61	Crew:
Sampling Time:   2:00 p.m.



Setup Time: 	4:30 p.m.
Temperature:



Temperature:
24° C.
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
8-9
8-10
8-11
8-12
8-13
8-14

8-16
8-18
8-20
8-22
8-24
8-29
Time













DO (ppm)
No, 1
7.85
7.13
6.75
6.11
5.88
5.73

5.25
4.98
4.87
4.60
3.92
2.72
No. 2
7.78
7.15
6.65
6.39
5.97
5. 74

5.48
5.08
5.00
4.57
3.75
1.93
DO (ppm)
(Average)
7.82
7.14
6.70
6.25
5.93
5.74

5.37
5.03
5.07
4.59
3.84
2.33
BOD
(ppm)

0.68
1.12
1.55
1.88
2.08

2.45
2.79
2.88
3.23
4.03
5.49
Comments:




K! =  0.123/day

-------
                       DATA SHEET - LONG TERM BOD'S
Station:  No.  9 - Willamette River



Date:     8-9-61
Crew:
Sampling Time:   1: 30 p.m.



Setup Time:      4:20 p.m.
Temperature:
Temperature:    24  c«_
Day
Initia
1
2
3
4
5
6
7
9
11
13
15
20
Date
8-9
8-10
8-11
8-12
8-13
8-14

8-16
8-18
8-20
8-22
8-24
8-29
Time













DO (ppm)
No, 1
6.97
6.62
6.12
5.91
5.37
5.58

4.23
4,87
3.83
3.90
3.28
2.05
No. 2
7.13
6.50
6.23
5.84
5«55
5.17

4.15
4.97
4.20
3.45
3.40
1.95
DO (ppm)
(Average)
7.05
6.56
6.18
5.88
5.46
5.38

4.19
4.92
4.01
3.68
3.34
2.00
BOD
(ppm)

0.49
0.87
1.17
1.59
1.67

1.86

2.04
2.37
2.71
4.05
Comments:




Kj_ =  0.0984/day

-------