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the
dredged trench to a level of 47 fest below L.V.0.3, 7.,
quarry spalle and pell-nell rubble above being correspond-
ingly increased in thickness to provide the same level for
the base of the wall and extent of apron as in the previsus
design.
8.
Mr. Duncan's successor, kr. Baker, the present
Port Engineer, states that as considerable doubt exinto
regarding the permanent stability of the foundations of
a quay wall constructed in accordance with the design of
his predecesser, an alternative design has been adopted
which eliminates sand as a material to be deposited in the
foundations and substitutes peli-mell rubble.
9.
It is anticipated that the foundations formed en
these latter lines will be completed along the length
frenting Marine Lata 450 and 431 before sur reply has been
received but, in view of possible economy by the use of
sand in the foundations of future extensions of the quay
wall at this site, Mr. Baker suggests that our advise ba
obtained on the following points:-
(a) Whether sand, equal to the sample as forvarded,
may be used for forming quay wall foundatione in
accordance with Mr. Duncan's first design;
(b) In the event of our being unable to approve the
design referred to in (8), whether sand, or part
sand, may be used in the quay wall foundatione,
and, if so, an outline of our proposals is required.
10.
Mr. Baker requests further that we should be
asked to advise, in connection with his alternative design,
to which the wall is new being constructed and which
eliminates all sand in the foundations:-