HomeMy WebLinkAboutItem VI (B) Acceptance and Approval of Water Service Relocation Project AGENDA 12-21-93
• ._ = Item VI B
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fyjf*Of 6000�`�` JAMES W.SHIRA,P.E.
CITY ENGINEER/UTILITIES DIRECTOR
150 N.LAKESHORE DRIVE•OCOEE,FLORIDA 34761
(407)656-2322
MEMORANDUM
DATE: December 17, 1993
TO: The Honorable Mayor and Board of City Commissioners
FROM: James W. Shira, P.E.
City Engineer/Utiliti s Director
SUBJECT: Wastewater Treatment Plant Phase II Expansion
Change Order No. 1
Attached for your information is a list of changes made during
the course of construction. These changes were initiated by Field
Order to cause the least delay possible in the construction
schedule. Items 1,2, 3,7,8,9,13 and 14 are credits totalling
$30,983.00 due to work that was deleted from the contract. Items
4,5, 6, 10, 11 and 12 are additions totalling $65,565.00. The net
amount of this change order is an increase of $34,582.00.
An explanation of the various additions is provided for your
information on the attached sheet. This change order also
includes a time extension of 23 days, which moves the completion
date from December 7, 1993 to December 30, 1993 .
This change order increases the total contract amount by 0.81% to
$4,283,082.00 which is well within the amount anticipated for
this project in the 1993 bond issue (see attached ) . After
allowing for this increased contract amount, the Wastewater Bond
Construction Fund account has a remaining balance of over
$850,000.00.
I recommend that the City Commission approve Change Order No. 1
by increasing the contract amount by $34,582.00, and extending
the contract time by 23 days, and authorize the Mayor and City
Clerk to execute Change Order No. 1.
THE PRIDE OF WEST ORANGE
Item Number 4 - Add 11 Joints 20" DIP:
This 20" ductile iron pipe is one of the main influent force
mains to the plant. The majority of this force main was
built as part of the Clarke Road construction project, with
approximately 250 feet along A.D. Mims Road deleted from
that contract due to scheduling problems related to tying
into what was then an existing active force main. We decided
to move this final portion of the new force main into the
wastewater plant expansion project so that the final tie-in
and re-routing of flow could be done by a single contractor.
Item Number 5 - Add Effluent Parshall Flume:
A Parshall flume is a device used for measuring the rate of
flow of a liquid. We are required by the Department of
Environmental Protection (DEP) to accurately monitor the
rate of flow of the effluent stream from the plant. We had
been doing this with an ultrasonic flow meter, but this unit
was found to be very sensitive to voltage variations, and
was frequently out of service due to nearby lightning
strikes or other electrical disturbances. When the meter was
out of service, we had no way to accurately measure the
plant flow, and risked being cited for non-compliance. The
Parshall flume is based on mechanical and hydraulic
principles, and is not affected by weather or power
variations. The flume being installed will accurately
measure flows up to and beyond the capacity of the plant,
without the need for electronic equipment replacement as
flow increases.
Item Number 6 - Add 30"X24" MJ Reducer:
This is for furnishing and installing a ductile iron
fitting that was required to properly tie into the
existing underground clarifier effluent piping. After
the area involved was excavated, it became apparent
that the existing conditions differed from what had
been expected, and this additional fitting was
required.
Item Number 10 - Add 8" Magmeter on RAS Line:
This meter allows us to measure the amount of Return
Activated Sludge (RAS) that the plant produces. An accurate
measurement of this component of plant flow is required by
DEP as part of the automatic monitoring calculations
discussed in Item Number 5 above.
Item Number 11 - Add Fittings for Force Main Tie-In:
This is furnishing and installing fittings that were
required to tie into the existing on-site force main. These
fittings were required due to the actual configuration of
the force main installed by Prima Vista being different than
had been anticipated.
Item Number 12 - Upgrade Programmable Logic Controller:
The programmable logic controller (PLC) is an electronic
device supplied as part of the Kruger process that controls
the operation of the oxidation ditch rotors and submersible
mixers. We expanded the monitoring capability of the PLC to
include the sludge press, master effluent pump station,
effluent filter and chlorine contact chamber. Since we
intend to distribute our effluent on a public access golf
course, we are required by DEP to provide 24 hour monitoring
of our effluent quality. By automatically monitoring
effluent quality 24 hours a day, we avoid the addition of a
third shift operator which DEP would have otherwise
required.
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