Rock Island Argus. (Rock Island, Ill.) 1893-1920, 1909-03-30
TEXT OF RECOMMENDATIONS OF EXPERT ENGINEERS ON FILTER

which can be remedied in advance by
more specific agreement.
4. We think it is desirable that the
contract should state that the con-
tractor shall be responsible for the
setting of all lines and grades on the
work except the preliminary survey.
5. We note that the duration of the
test is stated differently in two parts
of the specifications, which should be
remedied
6. We think that the capacity Of
the coagulating basin, provided by the
contractor. should be stated as below
some fixed flow line. Say elevation
"24."
Z. We are of the opinion that a
lcoagulating basin will be better work
ed in this climate by being covered,
and would recommend that this be in
cluded in the contract, should it be
awarded. We estimate the cost of
covering this basin with reinforced
concrete at $4,000.
s. Contractors who have appeared
before us have offered to deduct from
$500 to $11, geo from their bid, in
case the city will do the excavatine
and cofferdam work necessary TO pro
cure foundation. 1t may be observed
that nearly all of this amount will be
saved to the city by adoption of the
| hill site, hereinafter mentioned
/ In addition to these changes in the
specifications, we. would suggest thai
it is wise to remember that the city o.
Rock Island must expend further mon
leys for the completion of the plant, in
addition TO the bids as presented
THESE further moneys will be needed
including the extras elsewhere recon-
mended for the following purpose an,
in about the following estimate,
amounts
Estimate of work to be added t,
lowest bidder:
/. Additional clear water ba-
sins under filters. 1850 o.
II. Covering sedimentation
paSins -.-.. ........... 1000 O
| q. Completing raw water sue
ton from wet well and de-
; livery pipe to clear water
well, in excess of contrac-
: tors bid .................. 200O.G
a. Steam connections and
heating .......,..... =. 1900. o
D. Lighting .......... $685.
D. Laboratory equipments. $500
T. Completion of grounds
around building .... 5000
Is. Connection with city mains
FOR laboratory and motor
driven machinery ...... 2OO.1
=. Unknown extras on foun-
dationS, not included in
contractors bid and approx
mated at .............. 10000
;, 10. Expenses of final test,
general engineering super
i vision and inspection, say. 1000 0
g III. Additional sum for more !:
: efficient low lift pumping
engines -....... ......... 1S0OG
I lotdl $3.50, S2O450.t
t Amount of S20I50.0O is, in our opil
e ion, advisable and necessary to con
y Iplete the plant at the river pumpin
@ station in suitable shape for econ,
i mical operation and must be faced /;
! the outset as the necessary expend
n ture, additional to the work. covere
:, under the city's specifications.
Selection of Lowest bid.
, The examination of so many d
tailed propositions. as have been su
mitted to you, for the constructio
:. and equipment of the filtration plaI
- at the river station, has been VOL
u of no little difficulty. Many bidde
u have submitted numerous proposition
y each embodying different styles
machinery and methods of constru
IS ton. The bidders themselves diff
Is among each other as to certain min
e. methods of equipment. all of whic
G. however, may be regarded as good
is All of the plans submitted are,
e, our opinion, capable of efficiently al