Bacteriological Study oe Denver Water Supply 13 
COMPARATIVE RESULTS OF CO-OPERATIVE INVESTIGATION 
Samples Collected November 11, 1916. 
Table No. III.—Number of Bacillus coli per 100 c. c. 
Sample 
No. 
Source 
Jno. B. 
Ekeley 
State 
Chemist 
U. of C. 
W. G. 
Sackett 
Bact. 
Colo. Ag. 
Exp. Sta. 
Dr. W. C. 
Mitchell 
Bact. City 
& Co. of 
Denver 
H. I. de 
Berard 
Chemist 
D. U. W. 
Company 
Average 
1 . Mississippi Av. 
filtration Galler¬ 
ies, Inlet W. D. 
Res. 
0 
0 
0 
0 
0 
2. Platt Riv. Raw 
—Intake Mars- 
ton Lake—4 8 " 
Cond. . .. 
10 
10 
6 
10 
- T - 
9 
3. Bear Cr. Raw— 
Intake Marston 
Lake—Flume 
10 
10 
6 
100 
** 
32 
4. Marston Lake— 
Outlet N. S. 
Plant—Raw .... 
6 
0 
6 
6 
4.5 
5. Marston Lake N. 
S. Plant-Treated 
0 
0 
0 
0 
0 
6 . P. C. Infiltration 
Galleries—30" 
Cond. Wynetka . 
0 
4 
o 
u 
2 
2 
7. Slow Sand 
Filters, Treated 
—40" Cond. 
Wynetka . 
0 
0 
0 
0 
0 
8 . Willard Rapid 
Filters, Treated 
—34" Cond. 
Wynetka . 
0 
0 
0 
0 
0 
9. Marston Lake 
So. Side Plant 
—Treated—48" 
Cond. Wynetka . 
0 
0 
! 
1 
1 
0 I 0 
0 
10. Drinking Foun¬ 
tain in City— 
Cor. 1st & Bdwy. 
0 
0 
1 1 
1 1 
0 0 0 
11. Cherry Cr. In¬ 
filtration Galler¬ 
ies—Cap. Hill 
Res. 
0 
! 
■I 1 
0*1 0 I 0 
12. Tap in City 
Chemical 
Laboratory . . . . j 2 
1 
0 
1 1 
1 ■ 1 
0 I 0 1 0.5 
