Page 184 - 1915, Springs of CA.

168 SPRINGS OF CALIFORNIA.

Analyses of water from Duncan Springs, Mendocino County, Cal.
[Constituents are in parts per million.]

I S! ?t
14° C. (57° F.)
Properties of reaction:
9 9 2
0 0 2
0 0 0
18 18 0
73 73 95
')
( 12 70
By Reacting By Reacting By Reacting
Constituents.
weight. values. weight. values. weight. values.
X
Sodium (Na). ............................. 366 15.90 363 15.80 11 0.48
482 24.04 496 24.77 67 3.34
223 18.33 220 18.11 268 22.02
rpfortn
Sulphate (SO4) ........................... 22 .4ft
Chloride (Cl). . ............................ 178 5.03 178 5.02 18 .51
Carbonate (CO3) .......................... 1,597 53.24 1,610 53.66 746 24.87
Silica (SiOa)............................... Trace. Trace. 119 3.95
2,867 1,251
Carbon dioxide (CO2) ..................... 153 6.96 311 14.14
1. Soda Spring. Analyst, J. A. Bauer (?). Authority, Bull.U. S. Geol. Survey No. 32.
2. Soda Spring. Analyst and authority, Winslow Anderson (1889).
3. Magnesia Spring. Analyst, A. W. Thatcher(?). Authority, 10th Cal.
.There is a small sulphur spring a short distance above the Soda
Spring, and a more alkaline spring farther down the ravine, but these
two have been unimproved and seldom visited.
The country rock of the hillside on which this resort is situated
seems to be mainly serpentine, but between the pavilion and the
hotel there is a band of hornblende schist 20'yards wide, and a small
amount of siliceous sandstone float was noted on the slopes near by.

McDOWELL SPRINGS (MENDOCINO 32).
McDowell Springs are situated at the southern edge of McDowell
Valley, about 5 miles southeast of Hopland. Three principal springs
issue at the northern edge of the main creek through the valley, at
the base of a 30-foot bank. In 1909 one of the springs was improved
by a brick curbing, which formed a pool about 4 feet in diameter and
2 feet deep. Much gas rises in large bubbles in the pool and is prob-
ably carbon dioxide, for it quickly extinguishes a flame and the
water is strongly carbonated. The iron content has stained the
surface of the ground near by and the water is said to precipitate too
much iron to make it suitable for bottling. The following analysis
shows the water to be of the secondary alkaline type, only moder-
ately mineralized. The relative prominence of iron and silica makes
the water of chemical interest.