VOR
kun iga tesise et de
316
broken off and compared with the rock above water level at the sides of the bay, and, as the result of this comparison, there
seems no room to doubt that rock in situ has been reached. Over
a small portion of the area (6 feet diameter) covered by the
well, the rock dipped away to greater depth. The sinking of
this well was completed by the middle of October.
a
Whilst the operations above-described were in progress,
large number of prickings with Norton tubes (171 in all) were made all over the site of the dam, the result of which was to
confirm the information obtained from No. 2 Well and borings
formerly taken. They showed the presence of a hard layer, pre- sumed to be rock, at an average depth of about 40 feet over the
entire area.
As the information obtained from No. 3 Well cast some doubt
upon the reliability of that derived from No. 2 and from the borings, &c., operations were undertaken with a view to sinking the latter to a greater depth, if possible. It was then found
that what was formerly supposed to be rock was really a large
The removal of such an obstacle was necessarily a
work of some difficulty and it had not been accomplished by the
close of the year.
boulder.
In consequence of the results obtained from No. 3 Well,
attention was turned to two sites further inland, where trial
pits were made in the hillsides for the purpose of ascertaining
whether a satisfactory foundation would be obtainable without
excavating to great depths. Arrangements were also made for
sinking a well on one of the sites with the same object.
on the trial pits was completed by the close of the year,
Work
but
on the well it was delayed until the plant could be released
from No. 2.
No comments yet.
Private notes are available after approval.