HomeMy WebLinkAboutItem 04 - Mustang Elevated Storage Tank Pump Station ITEM #4
MEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
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FROM: BRUNO RUMBELOW, CITY MANAGER--��
MEETING DATE: MARCH 5, 2013
SUBJECT: ENGINEERING DESIGN SERVICES CONTRACT — MUSTANG
ELEVATED STORAGE TANK PUMP STATION
RECOMMENDATION:
City Council consider approving an Engineering Services Contract with Carollo Engineer,
Inc. in an amount not to exceed $ 79,785.00 for engineering design services on the
Mustang Elevated Storage Tank Pump Station, approve a contingency fund of $10,000,
authorize the City Manager to execute the necessary documents, and take any
necessary action.
FUNDING:
The project budget will be appropriated from the unappropriated Utility Fund Balance to
Account#200-48930-534-8-000032-WA.
BACKGROUND:
The Grapevine Water System experiences low water pressure in the higher elevation
areas of south Grapevine during the summer months. During the summer months TRA
is pumping a significant volume of water north along SH 121 into central and north
Grapevine. The pressure to push this much water north results in the Mustang Tower
remaining continuously full with little or no cycling of the water in the tank.
During the summer heat, water quality in the tower begins to degrade to a point her it
must be cycled into the system. This is accomplished by virtually turning TRA off for a
period of time and allowing the water in the tower to drain into the system. While the
TRA delivery is severely dialed back, pressures in the south part of to fall and are
most noticeable in the highest elevations in High out Estates and the Kelsey Court
area.
These pressures reach an undesirable level during this operation and then begin to
recover when the TRA Pumps are engaged.
ITEM #4
This is a daily, if not more frequent procedure. Our water plant operators have to
consciously initiate by notifying TRA to reduce flow, closely monitor the elevation in the
tank as it drops, and advise TRA when to resume flow to our system.
The pump station is proposed to allow the Water Plant Operators to pump down the tank
or cycle the tank against the high pressures provided by TRA and then slowly refill the
tank without having to ever reduce the delivery pressure from TRA. This should ease
the pressure problems that the residents have experienced over the past years and
improve the water quality in the tank.
Carollo will prepare the design, construction plans and specification for this pump station
that will be housed inside the elevated tank pedestal.
to recommends approval.