The herald., 1897-03-26
to avoid all burning or soorching Of ths

to avoid all burning or scorching Of th2
materials.
Hand mixing by the use of shovels or
other tools, or the use of open kettles IN
mixing the wearing surface will not be
allowed, and is positively prohibited.
The pavement mixture thus prepared
must be delivered at tho point of laying
on the foundation at a temperature OF
not less than $50 degrees Fahrenheit.
1t shall be then carefully spread by
means of hot iron rakes In such man
ner as to give a uniform and regular
grade of such depth that after having
received its utmost compression as soon
as possible after II has been laid, IL VIII
have a thickness of two inches.
The surface, after being spread with
hot rakes, shall be compressed with
heated hand rollers. after which small
amount of hydraulic cement or intusor-
ial earth shall be SWEET over 1t. 1t
shall then be thoroughly compressed by
a steam roller weighing not less than
two hundred and fifty (25o) pounds to
the inch run.
The rolling TO be continued for not
less than five hours for every one thou
sand 10000 square yards of surface, said
finished surface to be perfectly smooth,
free from all voids, cracks, and con-
forming at all points TO the finished
surface of the street as shown in the
plan and cross-section In the office OF
the city engineer.
When the pavement or asphalt wear
ing surface extends to the curb the pave
ment or asphalt wearing surface, laid
as hereinbefore specified, must in addi-
tion for width of twenty-four (24l
inches next TO and adjoining the curb
be coated with pure hot asphaltic ce-
ment (of the quality hereinbefore spec
ified) and smoothed with hot smoothing
. 1, ,,rr,f
to q certain depth with an excess of as
phalt No traffic to go over the finished
pavement in less time than forty eight
hours after laying. No wearing surface
shall be laid during rainy weather, nor
when the temperature of the air is less
than 40 degrees Fahrenheit
If the foundation is concrete no wear
ing surface shall be laid until said foun-
dation is at least seventy-two hours
old. nor shall it be laid when the sur
face of the foundation is wet
The bidder must deposit with the city
clerk prior to or at the time of sub
hitting his bid, samples of material he
intends to use. together with statements
under oath as follows:
First-A specimen of the natural CAL
ifornia solid asphaltum to be used with
a statement Of where the asphaltum was
mined.
Second-A specimen of the refined nat
ural California liquid asphalt used in
the rock and to be used in flux
ing the paving cement when heated.
Third-A specimen of the asphalt ce-
ment to be used with statement of its
Fourth-A specimen of the sand to be
used.
Fifth-A specimen of pulverized car
Donate of lime or other mineral dust to
be used
Specimens as above must be furnished
TO the superintendent Of streets as often
as may be required during the progress
of the work.
No bid to be received or considered
unless the deposit of materials and
statements referred to above accompany
said bid nor unless they strictly conform
to the requirements of specifications con-
tained herein.
Any bid accompanied with sample
which does not come up to the standard
required by these specifications shall
be rejected.
To secure uniformity in bidding all
samples must be submitted in sealed
glass jars or bottles duly labeled and
attested by the bidder. The jars or bot
ties will be furnished the bidder by the
,ity clerk. ...a,-.