134 
IOWA ACADEMY OF SCIENCES. 
The source of the contamination of the water supply is 
not far to seek. Within two blocks of the main street 
pumping station in all directions there are several manure 
piles and over fifty out houses. There are also nine wells 
within the area which pierce the so-called “impervious 
stratum of clay,” which, by the way, is loess, and below 
this there is coarse sand and gravel. The city wells are 
said to be ninety feet deep. The following cut represents 
the area: 
Mfest Seveftth St 
x X 
x X 
X X 
X 
X x 
X 
X. 
£ 
e 
1 
> xx 
X X 
o 
xx xx 
o * 
x D 
O * 
t % 
X 
o 
CO 
X X 
X 
X 
X X X X 
x x 
* X 
X Q 
X * 
X 
° X X 
fuojwsJ 
X 
> 
XX 
X 
XXX o 
X O 
* o 
x X XX 
x x 
X XXX 
W<?s* S-t. 
.Map of /Warn St. 
Vumpmg Stat ioi\ 
and vican&iy 
Sioux City, ]&. 
J- K. AchenbdcA 
O 
X 
x x x x 
X X 
□ 
□ 
Q H/etfc a] examined nraiei? 
X Out - houses. 
0 Manure piles. 
x x x 
X X X x x 
X 
The following analyses of the water of three wells of 
this region were made by Mr. John K. Ackenback. The 
results here recorded need no comment except that nearly 
every item in the analyses condemns the water for drink- 
ing purposes, yet the water from these wells and many 
* others is used by a large number of people in the region. It 
is a peculiar fact that those who live nearest the city water 
works make the least use of the city water. 
No. 1. 
No. 2. 
No. 3. 
510 West 6th, 
Jan. 23, 1904. 
613 Sioux street, 
Jan. 23, 1904. 
513 Sioux street, 
Jan. 23, 1904. 
Total solids . . . 
646.5 
612 
602 
Chlorides 
37 
23 5 
26.3 
Nitrogen as nitrates. '. . . . . 
IS 
6 
6.1 
Nitrogen as nitrites 
.025 
None 
Trace. 
Nitrogen as free ammonia 
.176 
.0664 
.040 
Nitrogen as albuminoid ammonia 
.128 
.0336 
. 155 
Oxvgen consuming power 
4.05 
2.83 
4.3 
