Page 140 - 1915, Springs of CA.

130 SPRINGS OF CALIFORNIA.
and to a plunge, and has also been used for garden irrigation. Water
from another spring that rises at the edge of the meadow, 800 yards
to the southeast, has been used to supply a wooden swimming plunge
near by. The observed temperature of this spring was 98° and its
flow was about 30 gallons a minute. Its water is more noticeably
sulphureted than that of the first-mentioned spring, and it also has
a corrosive effect on the boards that curb it.
A cool spring beside the hotel and another at camp grounds to the
southeast have been used for drinking. The other springs have been
slightly used for irrigating vegetable patches. The water of one of
them, called the Hobo Spring, issues with a temperature of 111°,
which is the highest that was observed in this group. An old bath-
house at the westernmost spring was apparently little used.
The following are analyses of water from the main hot spring and
the cool spring at the hotel:

Analyses of water from Campbell Hot Springs, Sierra County, Cal.
[Analyst, not given. Authority, advertising matter. Constituents are in parts per million.]
Main hot spring. Cool spring.

40° C. (104° F.)
Properties of reaction:
54 62
38 14
0 0
Primary alkalinity. ........................................ 0 0
Secondary alkalinity. . ..................................... 8 24
70 57
By Reacting By Reacting
Constituents. weight. values. weight. values.
69 3.00 97 4.22
Calcium (Ca). . ................................................. 44 2.19 44 2.19
Magnesium (Mg). . ............................................. 4.5 .37 4.2 .35
Iron (Fe).. .....................................................
Aluminum (Al). . .............................................. } » .75 13 .47
Sulphate (SO*).. . .............................................. 143 2.98 154 3.20
Chloride (Cl).. ................................................. 75 2.11 70 1.96
Carbonate (CO3).... ., .......................................... 14 .47 48 1.60
Silica (SiO2)... . ............................................... 117 3.88 116 3.85
487.5 546.2
The analyses indicate that these two springs yield waters of the
same general type, but the water of the cool spring is characterized
by greater proportions of primary bases and -alkalinity as well as
somewhat greater concentration.
The hills near the springs are of lava that is probably andesite.
The fault that passes through Sierra Valley has been mapped on
Plate III (in pocket) as passing close to the Campbell Hot Springs.
Hence the origin of the hot springs, like that of the hot wells farther
north, seems to be properly assigned to the presence of this struc-
tural break, through which deep-seated water rises.