Evening journal., 1905-11-07
CAN LAY MAIN
IN TURNPIKE
CONTINUED from First Page.)

meet its greater demands at cost Of
about $4,000, for a normal output of g.
100000 gallons per day of "A hours.
The city Of New Orleans. Louisiana,
after extensive investigation, received
bids recently for its requirements using
mechanical system and we are advised
that the highest bid was about s65O,COO for
a 1oOOOO,OOO gallon plant per day of "A
hours.
From these figures it is estimated that
a 100000 gallon plant. such as is re-
qulrcd for the city Of wilmington, should
be installed with all Of the best machin-
cry using duplicate units and the most
positive recording apparatus for an in
vestment Of about 100000
Comparing with a slow sand installation
Of equivalent capacity. the cost for which
is now estimated at about S30OOcO, # is
readily seen that an investment Of about
100000 is saved by the city. which should
be valued on a basis of not less than per
cent. covering combined charges Of in
terest and depreciation This amounts to
$1,000 per year on a saving in investment
against this item Of $4,000 per year must
naturally be charged the higher cost Of
operation Of mechanical system.
Our investigation satisfy us that the
difference in operating costs should not
exceed 81 per million gallons filtered.
which amounts TO sl2 per day at normal
capacity. or about $4,000 per year. You
will therefore see. under these conditions,
net saving OF at least $1,000 per year by
the use OF mechanical system.
1 Of
tion plants on the line Of the Mississippi
are OF course quite different from those
confronting the city Of Wilmington, aud
It has been unfortunate for many reasons
notn ecessary to detail here. that the st.
Louis filtration plant has been considered
so generally in connection with the VIII
mington situation. in so far as operation
and results are concerned.
Our investigation satisfies us that the
cost for coaguiants for treatment OF the
Brandywine water Will average consider
ably less than 50 per million gallons
throughout the year. 1t should run about
! $50 per million. In addition it requires
one man on each shift for any sized
plant up to 2O.OOoo0o gallons per day.
In comparison with these operating
/ charges, the SLOW stnu system aHoWS q
considerable labor item for periodic re-
movai and cleaning Of the top strata Of
/ sand. upon the cost OF which you have
several rather uncertain estimates. We
should Judge that this labor cost for
cleaning sand will reasonably amount TO
$40 per million gallons. We therefore be-
iieve that our previous estimates of per
million greater operating cost for a
mechanical system, is liberal. Under Will
mington conditions it is quite likely that
there would be less than fifty cents per
million extra cost.
AS a business proposition IN the inter-
a. of our city we, therefore. judge that
4 proof Of the following points in the use
OF a mechanical filtration system would
warrant its adoption. The regular prepa-
ration pf a filtered water both healthful
and satisfactory 10 the manufacturing en-
terprlses Of the city.
Second-The cost OF installation Of the
complete filtration outit and buildings OF
the most approved design TO approximate
slos.0o0 for a plant Of 100000 gallons rer-
day normal output, with a reserve cara
city Of 70 per cent. above poEraal.sag ssr