Q 135
P.W.E. New Territories.
It was found necessary to line several short lengths with cement concrete of a minimum thickness of 12 inches at distances of 291 to 304, 4191 to 461, and 554 to 627 feet from the Tunnel portal.
The rock met with was mostly granite of varying hardness with intrusions of soft green stone.
In December a start was made with the excavation of the open cut approach to the North end of this Tunnel.
South Conduit.-This work was nearing completion at the end of the year. Owing to the poor nature of the foundations more work than was anticipated had to be undertaken at the main stream crossing near the North Tunnel,
South Tunnel.-Operation was commenced at the North end in February and at the South end in April. By the end of the year a length of 1,327 feet has been driven from the North end while another length of 1,143 feet has been pierced from the South end. Granite of a good quality was found throughout and no lining so far has been found necessary.
A length of 884 feet of cement concrete invert has been laid up to the close of the year.
1925 Estimates, $400,000.00 Total Estimates, $1,100,000.00
1925 Sup. Vote, $50,000.00 $450,000.00
Expenditure to 31.12.25, $449,908.44
1925 Expenditure, $449,908.44
(f). Reception Reservoir.-A Contract for $170,208.43 was let to Messrs. Trollope & Colls (Far East), Ltd., in December, 1924, and the excavation for the foundations of the Draw-off Dam was commenced in February. Concrete depositing began in May and by the end of the year 1,100 c. yds. of fine cement concrete and 900 c. yds. of cement concrete displacer have been laid.
45 c. yds. of granite ashlar inner facing and 120 c. yds. of granite rubble outer facing were fixed.
The excavation for the overflow dam was completed and concrete laying begun before the close of the year.
1925 Estimates, $50,000.00 Total Estimates, $175,000.00
1925 Sup. Vote, $70,000.00 $120,000.00
1925 Expenditure, $99,271.64
Expenditure to 31.12.25, $99,271.64