Page 71 - 1915, Springs of CA.

HOT SPRINGS. 67

thick-bedded sandstone at the upper boundary of an area of shale
that geologically overlies the sandstone.1 These springs range in
observed temperature from 111° to 118°, and in discharge from about
2 to 10 gallons a minute. The total yield is probably not far from 50
gallons a minute. All of the springs are mildly sulphureted and
seem to be otherwise of similar mineral character. The following
is an analysis of water from the main spring:

Analysis of water from main spring, Montedto Hot Springs, Santa Barbara County, Cal.
[Analyst and authority, Winslow Anderson (1888). Constituents are in parts per million.]

Properties of reaction:
51
40
9
Primary alkalinity. ............................................................. 0
0
113
By Reacting
Constituents. weight. values.
Sodium (Na).. . ..................................................................... 110 4.80
Potassium (K).. .................................................................... Trace. Trace.
Calcium (Ca). ....................................................................... 30 1.52
27 2.20
7.9 .87
Hydrogen (H). ...................................................................... Trace. Trace.
Sulphate (SO4). ..................................................................... 393 8.18
18 .51
21 .70
Trace. Trace.
Silica (SiOs) ...................................................................... 20 .67
626.9
163 7.40
60 2.55
o If correct, this indicates an unstable condition. From the form in which the analysis was stated, how-
ever, it appears likely that this represents alkalinity, on evaporation of the residue, soluble in water and
may be due in part to loss of chloride on ignition. It has been so considered in stating the properties of
reaction.
This water belongs to the laxative class of medicinal waters, being
characterized by sulphate salinity of primary and secondary bases.
The tertiary alkalinity is prominent and adds to its medicinal value.
Two small bathhouses and a hotel and cottages have been erected
here, and the place was formerly conducted as a resort but was
closed during 1909 and 1910.
A portion of the water from the springs forms part of the supply of
the Montecito Water Co. It is aerated in a screened tank1 and part
of the sulphide content is thereby precipitated as sulphur and removed
before the water enters the mains.
SAN MARCOS HOT SPRINGS (SANTA BASE ABA 2).
San Marcos Hot Springs, which are sometimes referred to as Moun-
tain Glen Hot Springs, are situated about 20 miles by road northwest
of Santa Barbara, in a deep, brushy stream canyon. Warm sul-
i See Arnold, Ralph, Geology and oil resources of the Summerland district, Santa Barbara County,
Cal.: U. S. Geol. Survey Bull. 321, PI. 1,1907.