The San Francisco call., 1910-02-20

mum of settlement 1t is the most
solid type of seawall possible to con-
struct and will provide base for the
construction of such accommodations
as may be necessary if additional trans
bay traffic develops.
Section 8 will be constructed by the
same method as section s, from the foot
of Harrison street to the westerly line
of Spear street
This type of seawall is expensive in
construction, but the expense is be-
lieved to be justifiable from the fact
that 1t will be impervious to the action
of the tides, SO making possible per-
manent roadbed on East street and the
land to be created behind it.
FURTHER PLANS
The plans of the board as outlined
for future work contemplate the build
ing of permanent docks from the foot
or Harrison street up to pier 81, now in
course of construction, and from the
channel to the south end of China
basin To the north of the ferry build
ing the board hopes to be able to get
construction of a sufficient permanency
under the existing docks to warrant
the carrying of belt railroad equipment
and so give the desired connection be-
tween ship and rail the full length of
the water front
Abutting the seawall constructed
there are 20 projecting piers in the
hareor at this time, having total
length Of 36,093 feet of berth space, in
addition to which there are 1912 lineal
feet of bu1khead wharf also available
Tor berthing vessels.
In 1904 seawau bonds to the amount
OF 92,ooo,000 We're voted on and passed
oy the people at general election held
In November, 1904, and the first INSTALL
ment of these bonds, amounting to
S25O,o00, were sold on March 8, 1906.
Other 1nstallments of the bonds were
sold as conditions and necessities arose,
ana on January 2, 1910, the final In
stallment, amounting to S250000, were
SOLD, completing the issue of $2,0O0,000
with this amount of money the board
mas been enabled to construct seawall
oI the type referred to above, and also
permanent docks, built of concrete and
steel complete monolithic structures.
me construction of pier 40, the first
oock OF its kind, was begun November
l, l9OS, and completed. on June 26, 1909,
at cost of $303,200 Pier IS. differing
sHghtly IN engineering detail, was COM
menced March Is, 1909, and was COM
pIeled on September 8, 1909, at q cost
OF $2Ss,6O0. Pier Sc, q combination
uock and car ferry slip. was begun on
April l6, 1909, and completed January
= tvAVt lt q cost OF S30O,JoV'
Ihese docks are built on solid con-
crete piers, having structural steel
moor and she'd with reinforced con-
crete slab on the floor. The supporting
piers are constructed by driving a steer
cylinder of diameter greater than the
oase of the. pier exeavating the mud
ana water down to hardpan and erect
ing thereon reinforced concrete cyl
lhder pier After the concrete pier is
erected the steel cylinder is removed
ana used again The floor slab IS six
inches thick. reinforced with hall men
oars on nine inch centers. The hoor
siaD and steel frame are calculated to
carry live load of 500 pounds per
square foot. The shed walls are rem
forced concrete six inches thick. The
roof slab is two and three-quar
lhcnes thick. reinforced with wire clotn
and covered with five ply felt and
gravel roofing.
The relatively short time taken IN
the construction OF these docks, taklns 9
into consideration the magnitude of the
work, is due to the penalty and pre-