National Republican., 1874-05-08

tb sewers and six tuShes below the gran. ar Tho
quite. bottom OF tho slVers. and the Irenci tt,an
| filled L. 10 tho fevef OF thst grade with clean
| siiarp sa1d, and thoroughly Tsmmed and made
solid The trench shall be one fset wider oa each
side Of the sewer intended tn be latd IN II, 1T the
point Of its greStest external diarreter, provided
thnt it shall in no case be ofIess wfdrR than four
feet sfx Inches and from t5is point TO the botLsm
OF the trench the s'des shall be vertioa and also
from the same point the SIDES o. the trench shall
horfIoutsf 70 one foot vertical, and 30 cOntfRRed
until the trench has with Of twelve feet: theuco
cal, and &C > width OF Twelve ieet. In case tSg
width % tho sewer exceeds ten feet the trench
shall be excsysted one foot wider on eSch Side
sides o. ths trench shsll be carried up vertically
at that width to the surface. No rock outside Of
the line sbOvs described will bS estimated or
In all cases Of roes blasting the bIsgtto be care
iulay covered With heavy timber, sccoydHg TO the
blastiDs. and tss msssriaI 30 e1caysted 70 DO i'm
meIiately removed froap the groand.
or Wnsre allne Of watesptpe lntersects thu cgreh
Oe removed withoae blasttat ~ ~. b
Whereverrook Is sencouassrsd in sxcavataHgths
ny, IN snai % NrppeS q earth In ssstienSof
duly netihed in orderth As may meaSuse0r
m me same; and an the rock excaysted
will not be estimated or allowed: :
No soa or disintegrated rock which NAV be re--
In rock filings or elsewhere aut no roeE ISatso.
ever outside the lines Of the trench. ThJch ms1
have been previously loOsened tD sxcayatlng Tor ,
water pipes or other purposes; and which BY rea-
son Of such loosenlng, may fail into the trench.
will Be measured or allowed.
EMBASKxENT-
O. Where embankment may be found necessary =
to support the foundation Of the sewers, IL shall
be made of the width and slopes shown on the
plan OF the work. The ground shall be prepared
BY carefully grabbing and clearing II, removing
material, Of Whatever nature; the embankmeat
shall then be formed Of good loan, gravel, or
sand free from all stones Of above four inches in
diameter, and Of those neiowthat sine 10 . propor-
ton not to exceed one part OF stone tetbree parts
OF earth, In any place.. The material 10 to be de-
thickness; each layer to be separately compacted
oy heaVy iron rollers and where they cannot be
used, by heavy paxior's rammers.- ..r.. .
No breaks or Irregularities In the distribution
OF the material or formation of the layers win bo
allowed, and the whole embankment Is to be car
sohd ioundstion. Phe sewer viii Be- placed 4
thereon. and 1t must in all cases be covered at
least three ieet deep over its top with earth, in
slopes shown on the plan OF the work.
The embaukment shall be carried up 10 the
height OF the springing line Of the upper arch Of
the sewer in sections OF least one hundred feet
In length, before the sewer or any part Of It, is
constructed, and the trench subsequently eXca-
waited for the sewer in accordance yiLh the speci-
hcatlon for trenches.
That part Of the embanknent required to be
made before the sewer Is commenced shall be car
ried on lengthwise Of the sewer in one layer, and
the cmbankment on the centre iiueof the sewer
shall be kept at least twenty-five feet In advance
of the extreme outer side of the embankment.
Tho remainder of the embankment shall bs
made In horizontal layers Of not more than nine
inches in thickness, as above described.
All man-holes are to be carried up to their full
height, as described in section % Of these spech-
cations. and are to be similarly covered and pro-
tected for thickness Of at least three feet around
the shaft thereof
Receiving basins. with their connecting cuI-
yerts, are to be similarly carried up and covered
nrOtactRd VI n nr6R nv tho Anrnu
siOner Of Public Works.
Where the trenches do not furnish sudieieut ma
procure and supply such deficiency at his own cost
and expense.
REPILLIso.
10. After the sewer, with its required foundR-
ton, Is laid or built the work shall be backed in
and carefully packed and rammed by truSty per-
sons under and around the sewer, with proper
material and with proper tools In refiliing, the
earth or sand shall be faithfully rammed as tho
work progresses, and in no case shall the'number
OF men back-hlllng be more than twice the num-
Der of those ramming, nor shall the layers in any
case exceed nine inches in thickness.
IL. As the trenches are Allied in and the work
completed, the contractor shall cart away or
from the ground, or to such places on the line Of
the work as the engineers shall direct, and leave
all roads and places free, clear and in good orderI
and in case this Is neglected he Will be allowed
twelve hours only to remove the same, after .
written notification Of his failure neglect, when
1t will be done by the department OF public works
II. The rehlling in all cases shall be of good
loan, sand or gravel, free from stones Of above
tiOn not to exceed that required in section . OF
these specifications. For height or at least one
and half feet ct above ~ the top Of al PiPe,sowers
Where pipe-sewers are used especial precaution
will be required. The earth must be carefully
laid in so as not to disturb them, and tamped and
solidIy rammed down under and around tbs pipes,
with proper tools made for this purpose. The
trench shall then be filled by layers, as above de-
fhaHa fha los ~ loaa min
inches above the top Of the pipe shall be carefully
thrown in with shoYels, and not from barrovs or
,and an n n, eises S o. EHSk snd
manner above described for height of at least
fifteen inches above the top of the pipe.
Is. Should there be q deficiency OF proper ma
terial for relling, the contractor will be required
to furnish the same at his own cost and charge;
and in all cases the streets or avenues must be re-
filled to the same height as previously existed,
unless the commissioner Of public works shall d.
rect otherwise.
BRICK MASONRY.
H. (a) In the construction OF brick masonry,
none but the best quality Of whole North River
bricks, burned hard entirely through, will be
used; they are to be culled as they are brought
upon the ground, and all bats and all bricks Of
improper quality are to be Immediately removed
from the work.
(6l The bricks are to be thoroughly wet by i'm
Ond @ course is TO be laid BY line. Every brIcS is
required to be laid in full joint of mortar, made
as described in sections 10 and II Of these specih
tion. In case is mortar to be slushed grouted
in afterwards.
tel All Inverts, or bottom curves, are to be
worked FROM profles accurately made according
to the dimensions OF the sewer, and correctly set
to the grades furnished. Fitrifsd stone
ware inyerts will be used whom required by the
commissioner OF public works.
The brick are to be neatly and truly laid BY
line and the joints to be carefully struck on the
Inside. The bonds In all cases to be formed as
shown on the sections.
,(dl The upper curves or arches to be formed on
strong centres Of correct form and dimensions,
corning to the sizes and shapes required. The
centres shall not be removed or withdrawn until
the work is thorou ghiy set and the filling Of earth
Is properly put In to line which is at least half
way from the springing line to the crown Of tho
The brick are to be laid true and by line; the.
OF mortar. The centres are to be drawn or struck
with care, so as not to crack or lnjure the work.
from injury In any way. No wheeling or walking
on it will be allowed. and any portion injured
must be rccIsid by the contractor.
N All brick work, as 1t progresses, must bo
racked back in courses, and In no case will it be
allowed TO be toothed, unless by special permis-
sion in writing from the engineer.
Is. Vitrifed sewer-pipes or spurs equal In every
respect to those described In sections % and q OF
these specifications, and Of not less than six
inches interior diameter, and Of sufficient length
to project at least four inches beyond their OK
terror are to be worked into the walls of the
and in the direction of the tioW Of the current.
They are to be built in opposite each house, and
where there are no houses at an average distance
apart of seven and one half feet opposite all lot
fronts: they to be set that their inner ends
will be flush with the inner face of the sewer,
which end must be nodded or trimmed to the
same curve. They are to be set at such height
in the walls as the engineer may direct, and each
pipe or spur is to be closed outside by inserting
an earthenware cover made for the purpose.
All pipe branches or lateral sewers are to be-
similarly furnished and built in, where required
MORTAR.
10. All mortar is to be composed Of one part OF
fresh h-ground hydraulic cement, Of the best quail
ity, and two parts of clean, sharp sand, entirely
free from loam- 1t is to be carefully and thor
oughly mixed dry, and sufficient quantity OF
water is to be afterward added to make it Of good
consistency. The mortar Is to. be mixed in no
greater quantity than Is required for the work in
hand. Any excess that may be left over at night,
or that may have been standing longer than two :
hours, Is not to be re-tempered and used in any
way.
No moStar of improper quality will be allowed
to be used In the work.
All cement furnished by the contractor will Be
subject to inspection and test before It is used,
and II found Of improper quality, must be jmme-
diately removed from the work.
The contractor will be required to furnish the
engineer inspector full facilities for examining
and testing all cement brought upon the ground,
aud the engineer is to decide upon the character
and severity Of the test to be applied.
When cement is accepted, II not Immediately
kept dry, and In no case will It be allowed to be
placed upon the ground without bookings uRder
the barrels.
A N mort ar nust ha rnixad In a nronar box ,.o6a