Page 13 - sfdcoronersinquest

1
A
2
are many ualities of rock. It rests on twolayerst,f rock on the
3
east end and up to quite a distanceof the west endit was in
4 Schistd is the name that is attachedtie therock.
schist mica.
5
The west end was on a solid indurated conglomerate.
6
Q, What was the bottom on?
7
A On the schist.
8
»14 J'OU find anygranite there anywherefor the building
9
of the dam?
10
A. There is no granite in the country unill 70\I. get fl/lll&F
11
up the canyon past P01MJ:' Plant Number Two and then it is not a
12
true granite, and then it is gneissoidgranite.
13
Q This wasknown as a gravity dam?
14
A Yes, plus the arch, a pia gravitydam is concreteone
15
that depends forits stability on the mass of the concrete or of
16
the material, maybemasonry thatis in it without the advantage
17
of an arch. It is quite common, however,to archa damand this
18
was one of the arched kind. We call that really supplying a
19
factor of safety.
standing?
20
Q. Theu-oh then is the part that remains....,._,
21
A It is a piece of it. fhe whole thingacrossthe main
22
canyonwasan arch 'lq> to the l.yke part, which is four lnotl.ftf.. el"
23
fivehundredfeet long and that restson the dyke,and that n-.
taere still.
24
25
About how large a section is that whichstill remains?
26
A It is about ten feet thick andof various depths,-. to
27 the observations of the arch. It stands on an arch. The undulations

28
make it a deep as twenty-fivefeetin places, but it is all 1111rJ.M.
29
in the gr&un4. about a third.It is buried at an _.... of UG1d
30
a third, I \VO'd.4 say,of the thicknessof the enafttla is buried
31
in the material, in the formation.
32 When the damwas built did you go down deeperbelowthe
Q.