The Cairo bulletin., 1906-07-14

plication of similar mortar TO the face
of the hub. so as 10 form continu'
Gus and even beyel surface from
the exterior of the hub 10 The
exterior Of the spigot all around.
AS soon as the cementng OF
any Joint has been completed,
the bell hole under the hub must be
carefully and compactly filed with
sand or fine earth so as to hold the
exterior mortar finish OF said JOINT
securely in it's place. The fefiling
shall then be carried half way MP the
sides Of the entire length Of pipe with
selected earth and compacted with
proper tamping tool While The p'pe
and specials are being laid in cach
section between manholas 4or other
permanent openings light from the
remote end of the section shall re-
main constantly in plain view. Al
such places as have been h7reinbe-
fore indicated for that purpose Y
branch connections shall be inserted
in the main sewers and also in the
auxiliary sewers for house connec-
lions. Each branch thus inserted SHAH
be set half way between the vertical
and horizontal. Before leaving the
work for the night or at any other
/ time the end OF the sewer shall be
/ securely closed with tight-ttting
Iplug.
Paragraph 33.-The trenches for
1.-THE sewers shall be excayated along
the lines hareinhefore described to
the necessary depth for building the
sewers. Trenches for pipe sewers
shall be exeavated one (D foot wider
at The bottom than the external diam
eter of the pipe. Trenches for con
crete sewers Shall be exeaVated al the
bottom Of sufficient width 10 permit
the placing and removing Of form
for building said concrete sewer with
tont any underwriting of the banks.
wherever the original earth Is sntfi-
|cicntly compact and solid for the
foundation of the work, the contractor
french to conform to the exterior form
and diameter of the inyert of the
isewer. In case The trench be excavated
LAT any place below the proper grade
it shall be rehlled to grade with sand
or loan, thoroughly rammed, without
extra compensation. The material OK
cavated shall be placed compaclly
along the side of the trench and
trimmed up SO las to be oi
as little inconvenience as poss
sble 10 the travelling public and
street railway company. Where
the street is graveled the gravel
when excavated, shall be kept separ.
ate from the other eXcavated material
No tunneling, except that shown on
the plan, will be allowed. When tun'
melting. the contractor shall excavate
the material to as near the true cross
section of the exterior of the sewer
as possible, using timbering or other
tunnel lining and snoring in good
workmanlike manner After the
forms have been removed from each
completed section of the sewer built
lin tunnel cut, the space between the
outside of the sewer aad tao sides
and top Of the tunnel shall be carefully
filled and thoroughly rammed into a
compact mass. No eXcayated mater
iial shall be removed from the lire Of
work, without the permission 81 the
Board Of Local improvements OF the
City of Cairo. until he trench has
i 4 ~
material shall be and remain the prop
lerty of the city and shall he removed
to such reasonable distances by the
contractor. at his own cost and ex-
pense. as shall he designated by the
Board OF Local Improyementssof the
City Of Cairo. During the progress Of
the construction OF the section of the
sewer through the leyee. the contrac'
tor. at his own cost and expense,
must securely protect the levee en-
bankment. and should the water in the
river reach an elevation above the
bottom of the mouth Of the tunnel. the
contractor shall use sheet piling Golfer
dam. concrete or brick.work, as shall
be designated by the Board of Local
improvements of the City of Cairo. for
keeping ont the water.
Paragraph "a. Where the bottom
Of the trench is NOT sufficiently com
pact to act in itself rs n proper foun-
idation for the sewer. such timber foun-
dalion shall be built. as is shown on
the plans, Of two 90 inch by twelve
iuzb inch oak plank securely spiked
TO four 90 inch by 90 inch oak sills,
spaced not more than four CD feet
Icenter to center The width Of such
Timber foundation or platform shall be
ttwothirds - - the internal diameter
Of the sewer at that point. The sur
/ face Of the bottom Of the trench shall
be 80 excavated as 10 give the timber
! foundation good. firm bearing
Throughout Such timber foundations
shall be- placed IN The sewer trenches
wherever the Board Of Local Improve
meuts n the City Of Cairo may direct
/ the same 20 be- placed.
Paragraph -. Wherever ia is
NECESSARY o. 90 50 The side Of the
..-..-- 49, hall la I~araH and rendered