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should be substituted for the proposed vertical wall
surmounting the bank above the level of low water.
271
4. It is new clear from the documents forward ed.
with your letter under reply that the sea wall bounding
this reclamatian is being constructed as a deep-water
vertical quay wall and that a similar construction is
contemplated for future extensions. We conclude, therefore,
that considerations of which we have no knowledge hars
outweighed the disadvantages, referred to in our letter
of the 7th October, 1922, which are involved in the
construction of a deep-water wall at this site.
It remains for us to deal merely with the specific
points connected with the design of the deep-water quay upen
which ear advice is now requested.
6. The first design for this deep-water quay, which
fronts Marine Lots 430 and 431 md is new under execution
by contract, vas prepared by Mr. Duncan, late Port ‘Engineer,
and provided for a trench dredged on the line of the work
down to a suitable stratum and then filled in with sand to
a level of 39 feet below L.V.0.8.7. The surface of this
sand was to be astered with quarry spalla above which the
foundations were to be completed with pell-mall rubble which,
in addition to forming a base for the vertical wall of
concrete blocks set in sloping bịnd above, also formed a
vide apron in front thereof,
Owing, however, to the contracter being unable
to procure sand of the specified quality, Mr. Duncan, in
order to permit the use of a finer-grained sand, modified
his first design by limiting the surface of the sand in the
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