ROSE LAKE
 TRANSECT STUDY
FEDERAL WATER
POLLUTION CONTROL
ADMINISTRATION
NORTHWEST REGION
PORTLAND,OREGON

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              ROSE LAKE TRANSECT STUDY

                 Station No. 153007

              September 23 and 24,  1969
                    Prepared by

                   Gary L. Burns
                  Working Paper
                     No. 75
Technical Assistance and Investigations Branch
          Office of Technical Programs
Federal Water Pollution Control Administration
                Northwest Region
                Portland, Oregon
                   April 1970

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A Working Paper presents' results of




investigations which are to some extent




limited or incomplete.  Therefore,




conclusions or recommendations—




expressed or implied—are tentative.

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                                CONTENTS


                                                               Page

INTRODUCTION

     Purpose	   1
     Objectives	   1
     Authority 	   3
     Sampling Program  	   3

SUMMARY

     Findings  	   4
     Conclusions	   8
     Recommendations 	  11

STUDY AREA

     Station Location and Description  	  12

SAMPLING AND ANALYTICAL METHODS

     Sampling Methods and Schedule 	  13
     Analytical Procedures 	 	  13

DISCUSSION .  .	15

REFERENCES .	17

APPENDIX	18

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                                FIGURES

Figure No.                                                    Page No.

     1      General Location Map                                 2

     2      pH and Total Coliform Diurnal  Values
              Cross-Section Aveage)                               5

     3      Temperature and Conductivity Diurnal  Values           6

     4      Dissolved Oxygen and Percent Saturation
              Diurnal Values (Cross-Section Average)              7
                                 TABLES

Table No.                                                     Page No,

     1      Rose Lake Stream Survey Data 9/23-24/69               9

     2      Quarterly Report of FWPCA Water  Quality
              Monitoring Stations,  Dalene River  at
              Rose Lake, Station No.  153007                      11

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                              INTRODUCTION







                                Purpose







     The Federal Water Pollution Control Administration (FWPCA),




Pollution Surveillance Branch, maintains a system of water quality




sampling stations on interstate waters in the Northwest Region.




Throughout the year water samples are collected at these stations




and analyzed, and the data are used to evaluate water quality.




Knowledge of conditions peculiar to each station is helpful in  the




evaluation of the data obtained.  This study documents conditions




at Station No. 153007 located at river mile 153.4 on the Coeur  d'Alene




River approximately five miles below the confluence of the North  and




South Forks (Fig. 1).  Diurnal and spatial variances at the station




were observed during a 24-hour period.




     A similar study was performed on April 1, 2 and 3, 1969.   The




report on that study is available in the files of the Pollution




Surveillance Branch.







                              Objectives







     The objectives of the survey were to determine:




     1.  What is the optimum sampling point in the stream cross-




section?




     2.  What are the diurnal changes occurring in physical,  chemical,




biochemical, and bacteriological water quality at the sampling  site?



     3.  What factors influence water quality at the sampling site?

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5 10     ao    so   	so
  General Location  Kap
       FIGURE  1

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                               Authority







     Authorization for this study was from the Federal Water Pollution




Control Act (33 U.S.C. et seq.) as amended.   The study was performed




by the Technical Assistance and Investigations Branch of the Office of




Technical Programs as requested by the Pollution Surveillance Branch.







                            Sampling Program






     1.  Six water samples were collected every two hours for a




24-hour period.  The initial sample collection was at 1300 hours




(1:00 pm) on September 23, 1969, with the final samples obtained at




1100 hours (11:00 am) on September 24, 1969.




     2.  Three equally spaced sampling points were selected across




the river on the bridge.  Two samples were taken from each point,  one




at the five-foot depth and another five feet above the bottom.




     3.  The follo.v/ing analyses were performed on the samples:  pH,




specific conductivity, dissolved oxygen, total alkalinity, total




coliform, and temperature.

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                                SUMMARY


                                Findings


     1.  The total coliform concentrations shov; a minimum value—'

of 45 total coliforms per 100 milliliters (TC/100 ml) at 1500 hours

through 1700 hours.  The peak of 406 TC/100 ml occurred at 2300 hours,

By 0700 hours the concentrations had dropped again to 60 TC/100 ml

(Fig. 2).

     2.  The only fecal coliform organisms detected were at

1300 hours and at 0100 hours.  The concentrations were (5 fecal

coliforms per 100 milliliters (FC/100 ml).

     3.  The diurnal temperature fluctuation x>?as only 0.5° C.;

temperatures registered 13° C at 1300 hours through 2100 hours, then

gradually decreased to 12.5° at 0300, and remained at this value for

the remaining eight hours (Fig. 3).

     4.  At 1300 hours dissolved oxygen (DO) and percent saturation

were 9.0 milligrams per liter (mg/1) and 91 percent respectively.

The high values of 9.5 mg/1 DO and 96 percent saturation occurred at

2300 hours,  and then  decreased  gradually  (Fig.  4). '" •   "• .

     5.  The specific conductivity and pH values displayed similar

diurnal patterns.  The maximum values recorded at 1500 hours were

7.4 pH and 200 micromhos per centimeter Gumho/cm) conductivity.
     ~   All values quoted in the Findings,with the exception of flow
data and metals concentrations, are bi-hourly averages for the entire
cross-section.

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   75 ,


   74 -


   73'-

   72 -

   71 -

   70 -


   69 -


Time: 1300    1500     1700    1900   2iOO   2300    0100   0300   0500   0700   0900
  o.
                                                                                           1000
  400 1

  350

  300

  250
  200
r-  E
O
<-J O


 •r  150.
  100

   50
Time: 1300    1500   1700     1900    2100    2300   0100   0300   0500  . 0700   0900   1000
                      -pH and  Total  Coliform Diurnal  Values  (Cross-Section Average)

                                               FIGURE 2

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    ,
o  e
       135-
       130"
       125.
    Time?  1300    1500    1700   1900   2iOO   2300    0100    0300    0500   0700   0900    1000
   e
  • o
 •a r^
 c o
 O X
 u e
230i


220.




210




200"


190-



180




170J
          1300    1500    1700   '  1900    2100   2300   0100   0300   0500  . 0700    0900    1000
                                 Temperature  and Conductivity Diurnal Values

                                                  FIGURE 3

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S 60
  B
96
95
94
93 .
92
91
90
     Time:  1300   1500    1700   1900   2iOO   2300    0100   0300   0500   0700   0900
                                                                                    1000
  4J
  a
96
95
94
93
92
91 .
           1300 .    1500    1700     1900    2100    2300   0100   0300   0500  . 0700   0900   1000
                Dissolved Oxygen and Percent  Saturation Diurnal Values  (Cross-Section Average)
                                                  FIGURE 4

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                                                                   8







The values steadily decreased until 0900 hours the next day, when




pH was 6.9 and conductivity was 189 jimho/cm (Fig. 2 and 4).




     6.  The alkalinity concentrations remained steady throughout




the 24-hour period at 25 to 30 mg/1 total alkalinity.




     7.  The quarterly STORET retrieval from the Pollution Surveillance




Branch shows metals concentrations for the first day of the




survey (9/23) were:  copper—3 micrograms per liter (jag/1) , total




iron—650 jug/1, dissolved lead—55 jug/1, zinc—100,000 jug/1 (Table 2).




     8.  The mean daily discharges recorded by the U.S. Geological




Survey at Cataldo were 438 cubic feet per second (cfs) for 9/23/69




and 494 cfs on 9/24/69.







                              Conclusions
     1.  Generally speaking, transverse and vertical variations in




pattern values were essentially nonexistent (Table 1).




     2.  Sample collection may be at any point in the main cross-




section to obtain a representative specimen.




     3.  The upstream factors that influence water quality at the




station are:




         a.  The South Fork of the Coeur d'Alene River receives




untreated wastes from mine tailings, acid industrial wastes from




zinc, and lead smelter operations, phosphoric acid wastes, and wastes




from an antimony plant on Big Creek.  The mine and smelter wastes




contain heavy loads of suspended sediments and biologically toxic




concentrations of lead and zinc.

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           TABLE 1

ROSE LAKE . STREAM. SURVEY DATA
          9723-24/69
TIME
STATION
1300
15.QO
1700
1900
2100
2300
0100
0300
0500
0700
0900
1100
TEMPERATURE WC
ABC
13.0
13.0
13.0
13.0
13.0
12.8
13.0
12.5
12.5
12.5
12.5
12.5
13.0
13.0
13.0
13.0
12.8
12.8
13.0
12.5
12.5
12.5
12.5
12.5
13.0
13.0
13.0
13.0
12.8
12.8
12.8
12.5.
12.5
12.5
12.5
12.5
A
7.2
7.6
7.3
7.3
7.0
7.0
6.9
6.9
6.9
6.9
6.9
6.9
PH
B
7.5
7.4
7.3
7.3
7.1
6.9
7.0
6.9
7.0
7.0
6.9
7.0
C
7.5
7.3
7.4
7.1
7.1
7.0
6.9
6.9
6.9
7.0
6.9
7.1
CONDUCTIVITY
ABC
205
220
210
209
205
195
200
191
195
199
197
165
218
220
199
185
195
196
187
199
187
184
191
170
220
223
199
200
203
198
204
197
197
188
187
159
DISSOLVED OXYGEN
ABC
8.9
9.1
9.0
9.4
9.4
• 9.5
9.5
9.4
9.3
9.2
9.1
9.2
9.1
9.1
9.2
9.3
9.5
9.5
9.4
9.5
9.3
9.2
9.2
9.3
9.1
9.1
9.2
9.3'
9.5
9.5
9.4
9.4
9.3
9.2
9.2
9.3
% SATURATION
Ax B C-,
89
92
93
95
95
96
95
95
94
93
92
93
92
92
93
94
96
96
95
96
94
93
93
'94
92
92
93
94
96
96
95
95
94
94
93
94
TOTAL COLIFORM
ABC
640
178
50
40
165
330
610
215
90
85
80
145
110
160
50
55
65.
440
180
85
50
110
60
110
125
180
30
40
55
450
165
100
165
90
65
110

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                          TABLE 2

QUARTERLY REPORT OF FWPCA WATER QUALITY MONITORING STATIONS
                    DALENE RIVER AT ROSE LAKE
                     STATION NO. 153007
DATE
FROM
TO
69/07/08
69/08/05
69/08/26
69/09/23
TIME
OF
DAY
1800
1300
1730
1615
SWL
FBI
mg/1




COPPER
CU
ua/1
12
12
3
3
IRON
TOTAL
ug/1
340
670
275
650
LEAD
PB,DISS
UR/1
50
93
30
55
SILICA
DISSOLVED
mg/1
9.6
11.0
12.0
11.0
ZINC
ZN,DISS
us/1
2110
3850
5700
10000
COLOR
PT-CO
UNITS

5
15

COLIFORM
DLY ENDO
MF/100ML

25
1750


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                                                                  11







         b.  Raw municipal waste is discharged into upstream waters




from the communities of Wallace, Mullan,  Osburn,  Silverton,




Smelterville, and the Burke-Male-Gem area.   The city of Kellogg also




discharges lagoon-treated municipal wastes.






                            Recommendations






     1,  Dissolved oxygen analyses should be performed using both




the Winkler (Azide)  Method and a dissolved  oxygen probe to determine




if the Winkler Method is distorted by the heavy metals concentrations




in the water.  This  procedure is recommended for all routine sampling




stations that monitor waters from the South  Fork of the Coeur d'Alene




River.




     2.  The routine samples should always be collected at approxi-




mately the same time of day.  If possible,  the upstream industrial




schedule should be obtained for the day previous to and the day of




sampling.    '  .




     3.  A 24-hour survey at the sampling station should be conducted




on a quarterly basis.




     4.  An extensive survey should be conducted in the area, con-




centrating on the effects of heavy metals and the origin of bacter-




iological contamination.

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                                                                  12
                               STUDY AREA







                    Station Location and Description







     The Rose Lake Station No. 153007 is located at river mile.




153.4 on the Coeur d'Alene River approximately 15 miles below the




town of Cataldo and approximately 25 miles above the entry of the




Coeur d'Alene River into Coeur d.'Alene Lake (Fig. 1).




     The specific location is:  lat 47°32'13" N, long 116°28'16" W.

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                                                                  13
                    SAMPLING AND ANALYTICAL METHODS


                     Sampling Methods and Schedule


     Water samples were collected every two hours during the 24-hour

period.  Collection was made at three predetermined cross-section

points, with two vertical profile samples taken at each of the three

points.  The samples were obtained using a Kemmerer—  Sampler.  A

single "haul" provided enough water to fill containers for chemical

(dissolved oxygen, conductivity, pH, and alkalinity),  and bacter-

iological (total and fecal coliform) analyses.

     Dissolved oxygen samples were chemically stabilized at the time

of collection for titration upon return to the field laboratory.

     Temperatures were noted and recorded at the time of sampling

using a hand thermometer.

     All of the analyses were performed in a 17-foot enclosed labor-

atory trailer stationed near the sampling point.


                         Analytical Procedures


     The following laboratory methods v?ere used for analysis:

     pH was determined with a Beckman Zeromatic Model pH meter.

     Specific conductivity analyses were performed using a Beckman

Model RB 3-327 conductivity bridge.
     ~~   The mention of brand names is for identification only, and
constitutes no endorsement by the United States Department of the
Interior, Federal Water Pollution Control Administration.

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                                                                  14
     Dissolved oxygen samples were titrated for quantity,  using the




Alsterberg (Azide) modification of the Winkler Method as found in




"Standard Methods" (1).




     Alkalinity was determined by titration with a Hach Model DL-ER




portable laboratory.




     Fecal coliform determinations were conducted using the membrane




filter method according to the procedures as described by  Geldreich (2)




In studies by Geldreich (3) this method was confirmed as comparable to




the most probable numbers method for fecal coliform as described in




"Standard Methods" (1)




     All the bacteriological samples were incubated and counted in




the field.

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                                                                  15



                               DISCUSSION




     The diurnal parameter patterns are illustrated in Figures 2,



3, and 4.  It is noted that a sharp rise in total coliform,. dissolved



oxygen, and percent saturation values and a decrease in pH and con-



ductivity occurred at 2300 hours.  This phenomenon is apparently



caused by waters from the daily mining and domestic activities of



upstream communities converging on the sampling point.  A consistent



flow of 438 cfs was recorded on September 21, 22, and 23, and the



flow increased to 494 cfs  on September 24.  This increase in flow,



combined with the lack of algal activity and the possibility of


                                                       o /
analytical interference due to high iron concentrations—' could



account for the increased dissolved oxygen values recorded at



2300 hours.



     Because of the extreme seasonal and daily variability in water



quality conditions, and the numerous factors that influence the



patterns (flow, industrial and domestic activities, rainfall, etc.),



the instigation of a quarterly 24-hour cross-section sampling program



would yield more interpretive data.


     Mining and smelter wastes contribute heavy loads of suspended



sediments and biologically toxic concentrations of lead, copper, zinc,
     —' It is stated in "Standard Methods": (1)  "The Alst.erberg

modification is used for most sewage, effluents and streams if they

contain not more than 1 mg/1 ferrous F .   Other reducing or oxidiz-

ing materials should be absent."

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                                                                  16
and arsenic to the South Fork of the Coeur d'Alene River.   As  a re-




sult, the South Fork has become biologically sterile.   Both the




South Fork and the Main Stem have been destroyed for water uses




except waste disposal.  Farm lands along the river must provide dikes,




flood gates, and pumps to prevent these toxic wastes from reaching




the fields.




     Although insufficiently treated municipal discharges  introduce




high bacteriological concentrations into the South Fork, the prime




cause of pollution is the presence of toxic concentrations of  heavy




metals.  The South Fork of the Coeur d'Alene River sewer district




has completed an engineering study on sewage collection and treat-




ment, and is in the process of securing financing.




     The State of Idaho reports the mining operations  are  installing




tailing ponds to remove silt and sand from mine washings,  and  are




studying treatment procedures for the reduction of contaminants from




metal processing operations and significant sources of mine drainage.







                              Field Data







     The appended material contains all field and laboratory bench




data obtained during the study.

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                               REFERENCES
(1)   American Public Health Assoc.,  Inc.   Standard methods  for
     the examination of water and wastewater,  12th ed.   1962.
(2)   Geldreich,  Edwin E.,  et al.   Fecal coliform organisms
     medium for  membrane  filter technique.   Journal American
     Waterworks Assoc.   57:2,  208-214  1965.
(3)   Geldreich,  Edwin E.,  Sanitary significance of fecal coli-
     forms in the environment.   Water Pollution Control Research
     Series Publication No.  WP-20-3.   U.  S.  Department of
     the Interior,  Federal Water Pollution Control Administration,
     1966.

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     APPENDIX
STREAM SURVEY DATA .

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STATION! NO.
9/23/70
TREAM  SURVEV DATA
PAGE
O~
.
r V-\ f~\ A N^t ul T" *""" *" '
i

rCTNi R °C
CONJD. ,o.7V,c,
1 ''
O TtT.c/v IT
OQ . , , , ,n ,'.
-i ALr<. v
j [ r-io'l. j V/H.'.jE
u.' '• TTP/IMT
>: D,O, -••'-''•
•• T. Coll.
. . Fpr?l P.nn .
TEMP. "C
COMD. f- ,-\ r«/-
w 1 ^: "".. ;..-
F T. Coli.
Fecal Coli .

LOG/
A B
'
j 13.0 13
i 190 T,
7.1 7

so :
i
1 •
i
8.7 9
1100 M
0
13.0 13'
i
220 22
7.5 7

25 C
i
9.1 9.
180 '•• 17
0

xTiON: -sM
C

0 ; 13.0
?0 215
3 7.4
l
50 ' 30
0 9.1
50 120
i
0 0
0 13.0
!0 220
l
7 7.3

!0 30

1 9.1
0 120
0 0
1
cnos?
D

13.0
220
7.5

30
9.1
100
0
13.0
. 220_.
7 fi

25

9.1
200
0

	
E

13.0
225
7 5

30
8.9
150
2
13.0
220
7 5

30

9.0
60
	 2

\ (^

~ ~ '
13.0

7,R

35
9.2
100
• 2
13.0
-225
7 1 -,-

30

9.1
100
_JL_

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5 TAT; ON/  N^

9/23/70
                     15300?
^v 	 ,	k ,	 ,       s^.   	       I  »
 *^~OJ^ A •,/,    \i ;r^\/r.zv/ .  '/»••*• A
_/ ;  r-. ft. /-A '    > .• i	• -\.V :   •  i*/'  • • ''^

OF_6
i LOCATiOM- ;X] CROS5 ACTION: ("CM-.!: KEY ON.< PAG."'.) STATISTICS j
r -\*\ i""^ xs •*/ [""•"T* *•-*' ^7 1 1! •
![*•/•*• I /*J) . ^ ){ 1 1 ;- • • « . ., 	 ! , . . ,. 1
:. ' •. i *
TC.MP. °C i 13>0
COrJO. ;j.r,ho 22Q
_! I I
P t i "7 O
0 ! /.£
H AU;<. i '"•'•
ovj/i. ; VALUE: 25
J I D.O. :."r';-;'M:'
,- vv-.;,/i. j VP.LUe i 8.8
• • T. Coll. 1 50
i I 1 Wv M^. /v- i
B- C ! D j E ! F i - ! ' "*•- ' 11(- j AV':!- j
13.0 13.0 13.0 | 13
.0 i 13.0 ! !
j ' j i i ! i .]
200 i 198 200 ! 200 ! 198 ! 1 1
7.3 7.2 7.4 7
-• I
25 , 	 25 L 25 i
. ' .!
9.2 9.2 9.1 9
.4174! • ii' '
( ..... . 1
25 25 ! j i
i ! i! ' '
; j
.2 9.2 i
i : : i |l
50 70 30 50 10 I
i 1
For.,1 Tnli 0 0 0 0
TEX; P. »C i 13 0
COMD. r-
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3TAT i O Ni NO.  1530Q7
9/23/70

URVEV  ATA
p>\pAr^")PTER .

TEM R °C
CONJD- ?.:<"n'no
pM
g! i hrrfcAMT
°: A' '< • '".'•
oa /••S'_f\.
! >•»?/!. ' VALUE;
111 ', T,T(Vi.-.)T
v- T-> O '••''•
^ u. --A •- ••
.- »•>*>/;. vwj£
"•" ~" '
T. Coli.
: Frrnl Coli .
TEM P. "C
CON! D. |--av>'.o
PH
j T.Tf'-'iMT
oi A; i/ . •••'.!•
g | .,b>V WLUJ."
i j TirCAfJT
rl o : ^'^
_ 'Nv''./\. ',' V/-!~IJE
\ • " )
f- T. Coll.
1
j Fecal Coli.

LOG AT1,
A B
| 13.0 13.0
210 200
6.8 7.1
i i
!
25 25

9.4 9.4
80 250
0 0
12.8 i 12.8
!
200 : 190
7.0 7.0
i
25 30
1
9.4- 9.5"
280 - 380
0 1 0
| '
OM .IN
c
12.8
200
7.0
25

9.4
40
0
12.8
198
6.q
30

9.4
470
0

CROSS
D
•12.8
190'
7.1
25

9.5
90
_. 0 .
12.8
19 2_
fi,Q
30 '

9.5
410
0

i?.t-;cT;o:
E
12.8
195
7-.1
25

9.4
130
	 D_.
12.8
	 • "•—
18R
7. JO
25

9.4
330
0

. /• 	
F
12.8
210
7.1
25

9.5
80
.. 0 .
12.8
- _2oa
7 0
30

9.5
570
0

E KCY C


















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-------
3TAT;ON MO.
9/24/70
              153007
STREAM  SURVEV DATA
PAG"._ A  OF.
1 1 '
| A B
TEMP. ~C j 13.0 13.0
t "" " ]
COKi!"'. 'j''r\'rc^ ! 9nn onn
^' • - / "• ^ i tUU /|. VALUE | " "
111 „ ^ T.TP/.MT i
- [?>S/i. "vnwr. j 9-4 '9.5
T.. Coli. i 47° 75°
! F-,1 rnn 1 0 j 0
,.v .7.^ cv. • ii - - - T

i i. ii i
''"""' l! ^8 6 Q
	 i1 •- : u . o , —..\j...j...
! Tivt'^wr 'i i
g /\i '/ i- >"-M' i!
g ,^,V/;.' ! WU.UJ.-' | 30 30
! ! r *'.'"* jj
^ -y\. ! VMLUE 1 9.4 9.4
P T. Coli. 270 -- 160
Fecal Coli. ! 0 0
1
ON. IN! C^OSS
C 1 D
i
13.0 i • 13.0
ioc i on-
lo b i- • i y u
7.0 i 6'. 9
i
1
25 | 25
t
9.4 .|' 9.4 '
200 | 160
0 | 0
12.5 ! 12.5
188 ! 200
i
69' 69
30 ! 25
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•: Key OM PAG.-:) j STATISTICS
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STATION  MO.
9/2.4/70
1530Q7_
D T REAM  OURVEV DATA
PAGE __5__ O F  6
_O CAT !
pAf-;ANAri7~~> '
• il " """• ' ""
| A B-
i ' •- • • <
TEMR "C |j 12<5 12_5
CONJO. f-.MT.So 2oo 190
PU i
t" ' • 6.9 6.9
g riT«A.MTii |
d /\! •< |, ""'.'• ji
»v7-j/i. j VALUE ij 25 25
| D.O. -T'TM.MT . ..
— v i v*/ 1. : vrj '..{_; £ Q 7 0 Q
; 	 [ ••' , ; J * *J J • O
' ! i
1 T. Coli . i 60 i 130
|
For,i1 Pnl-; . li 0 .! 0'
TF-'v.x'O T !'
. ^ n...,^, . c , 12<5 12.5
CON-.D. «.•>!>•/? 188 200
!
P^1 ! 6.8 • 6.9
j "Ti?rtMT ;
S ^A V/\LUJ:- i 25 • 25
o . •' !i .._ -
j | i Tiri-'A.KiT |
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w ^r/(. "V/ILUC '9.1 '9.3"
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h T. Coli. 90 ^-100
Fecal Coli . ! 0 0
! 1
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OM .!N CROSS SECTipKi (f^r?
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C i D ; E |F
12.5 12.5 12.5 i 12.5
i
185 188 -i 192. ': 200
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7.0 7.0 i 6.B i fi.Q
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25 25 25 | 25
9.2 ! 9.3 9.2 i 9.3
60 40 140 ! 190
o ; o o ! • o
12.5 12.5 12.5 1 12.5
" " 	 " " :~ *' ' 	
180 188 194 i 182
6.9 7.0 6.9 1 7.0
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25 ' 25 •' 25 I 25
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120 100 i 80 j 100
0 I 2 0 ! 0
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5TAT ION  NO.
 9/24/70
                    153007
T~ O';r f\ T-./I    V '.f'N/^r
1  !—\ C. A-\ l  .  »_/ O ,-\V C
PAGE _6	OF.

i LOCATION IN CROSS
A | B C D
TfJ.XR "C 12.5 12.5 12.5 12.5
CO.SJO. p-nho i98 195 195 | 187
PH ' 6.8 6.9 6.9 6.9
i T: Tf-; A,- ,-T
AII- i n'' '•
. \ — 1'~* • r
rvtfj'/i. ; VAi.ua 25 25 25 "25
i
Q o '-•• ''''''•' • - • 	
>Wi. • vfl«.-.E i .9.0 9.1 9.2 ! 9.1
I ' 1
T. Coli . 1! 50 40 60 60
rpr.ii r.nii • 'i 0 i o o n
T"~kxP °r '' ' '
'" • 12.5 12.5 ' 12.. 5 12 5
Ii
CCK'D ur,-;^ 1
' "- ! 160 170 170 169
P'"' II 6.9 • 6.9 7.0 6.9
AiK I"""! . .
.,:,y/', j V/Uur j 25 25 j 25 25
] TirCA,,i-r i
;-:vy\' : v/li-UE 9.2 9.2 9.2 9.3
T. Coli. ' i 160J ~ 130 i 120 100
1 ii i
Fecal Coli. F Q! 0 0 0
ii
ii
I-.ECTlOki ("sen KCY ON RAGE 0 Ij ' STATISTICS '
T? " ! pi MAX. MiiM. AV^.
11 ! r 1 . !
	 i 	 " 	 ' ' : l ~~"i 	
12.5 12.5 !
i
175 178
! !
6.9 6 Q
|
25 25 i
	 1
9.2 9.1 | i
i
30 100 i l • i
0 0 ^ • . _ . i J
__ _
1 2 5 1 ? 5 ' '
1 k_ I N^ 1 t» « \^ ' ' .i..i
!
158 160 ' •
7.1 7.0 I
i i
25 • 25 i
i i
! ! 1 . •
9.2 9.3
j i ' '
70 130 1 i
i '
0 0 i
i 1 i
i • l!
r~

-------