Rock Island Argus. (Rock Island, Ill.) 1893-1920, 1909-01-28

;ary sand and gravel Gravel must be
If such depth as to thoroughly protect
he screen system from sand and of
such size as not to become deranged
in washing The bidder will give the
size and depth of the sand and gravel
he proposes to use in submitting his
proposal. He must specify the effect
i've size and uniformity coefficient of
the sand he proposes to use and shall
furnish a sample of his bid The
bidder will be compelled to
furnish a sand that will answer fully
to the sand he bid upon furnishing.
SECTION 81.
Controllers-The rate of filtration
shall be controlled by an outlet con-
troller, placed in the discharge pipe
from each filter Contractors will
submit detailed drawings and specifi-
cations of the type of controller which
it is proposed to use and a chart show
ing the operation and percentage of
variations as used in actual practice.
SECTION rs.
Loss of Head Gauges-Each filter
will be equipped with loss of head
gauge to indicate when filters require
washing. Gauges to be located at
convenient point adjacent to each
filter
SECTION 90
Sample Outfit-There will be pro-
vided a suitable means of securing
samples from each individual filter.
Also means of securing samples of
the raw water, treated water and the
clear well, consisting of glass vases or
other receptacles located at some con
venient point on the operating flor
through which shall be circulated con-
tinuous streams of water Bidder to
submit detailed drawings of such ap
3aratus he proposes to furnish for this
work
SECTION 80.
Filter Connections-Each filter bed
will be equipped with raw water inlet,
filtered water outlet, wash water in.
let and the drain to the sewer and air
inlet. each properly provided with
controlling valves and connections -
the various main lines of pipe con-
trolling same. Bidders will specify the
style AMI make of valve proposed.
method of operating and furnish de-
tailed drawings of same.
SECTION 81.
Solution Plant-The plans show
the construction of four "a concrete
he shape or size of these tanks do
not coincide with the bidders ideas he
is at liberty to change their size or
design in such way as will enable
him to comply with the requirements
OF guarantees.
II is the intention and desire to use
sulphate of iron and lime for the pur-
iiication of the water. The plant
should be arranged so that sulphate
of aluminium may also be used il the
, successful bidder determines that it
is necessary to the fulfllment of the
guarantees. Each bidder will specify
| the material he proposes TO use as
coagulant or reagent for the purifica-
| ton of this water in the fulflllment of
| the guarantee requirements. The ar
rangement for feeding solutions shall
! be such as to be under full and COM
rlete control of the operator at ali
times and shall be readily adjustable
| to various quantities in such manner
| that the operator may know at all
times the amount and character of the
solutions he is using. All piping.
valves and fittings that may be used
on an acid solution shall be made of
material not affected by same and the
contra tor will specify this and show
| in his detailed specifications the ar
rangement proposed for preparing and
applying the solutions properly. All
pipe or fittings through which milk of
lime may be conveyed, shall be made
in short sections easily removed for
cleansing or with plugs and tees at
bends in place of ellis so that brush
NAV be used in cleaning. Solution
tanks will be provided with gauges SD
that the operator may have knowl-
edge of the amount of solution each
tank contains at all times from the
operating floor.
| SECTION 80.
Scale-There will be installed in the
storage room a storage platform scale
of 500 pounds capacity for properly
weighing the chemical charges to
solution tanks.
SECTION 33.
Cast Iron Pipe-The contractor will
furnish and lay all cast iron pipe, cast
iron bell and spigot pipe, bell and
igot specials, flange pipe and fange
specials used in the construction of
the slant to a point outside of the
lines of structure indicated on the
drawing. including suction discharge
piping to low-service pumping machin-
, cry, wash-water pumps, sludge pumps.
tall piping and fittings in the gallery
and sedimentation basins required for
1t