HomeMy WebLinkAbout7.d. Water Tower & Well RFPW,.fey, -gid•
DATE: JANUARY 14, 198$
TO: MAYOR & COUNCILMEMBERS
C/O STEVE JILK
FROM: CITY ENGINEER/PUBLIC WORKS DIRECTOR HEFTI
RE: ITEMS FOR THE JANUARY 19, 1988 COUNCIL MEETING
NEW BUSINESS
Approve RFP for Engineering Services for Design and Construction of Well and
Water Tower
The Utility Commission and Staff are recommending that the City solicit RFP's for
engineering services for design and construction of a well and water tower for
1988 and 1989. As the RFP indicates, the City has a 0.5 million gallon reservoir
and capabilities of pumping 3.6 million gallons per day (MGD). However, about
0.75 MGD of this amount is not dependable for the future because of the well
(Well #6) which supplies this amount has a vibration problem due to the shaft and
casing not being in true vertical alignment. Therefore the effective capacity
the City has is just under 3 MGD. As you can see from the attachment, we
averaged a little over a million gallons per day during the month of Junein
1987. The overall average for 1987 was 110 gallons per capita per day, or
756,000 gallons per day.
To be able to accomodate the demand for water, the City should be able to supply
the maximum day demand. Industry standards recommend that when planning to
supply water to handle a maximum day demand that the rate of supply be between
150 and 250 per cent of the average annual demand. Using 200% as a midpoint,
then the recommended rate of supply for a maximum day would be 1.5 MGD._ This is
fairly consistent with our pumping records because over the course of one of the
driest weekends in June we did pump about 1.3 MGD.
Although this is still below our maximum pumping capacity, Staff and Utility
Commission feel that the City should start planning for a new well now because of
the relatively rapid rate of growth the City is experiencing. Our water demand
increased 58% (173 MG to 273 MG) from 1985. If that trend continues then the
estimated water demand for 1989 would be about 440 million gallons or 1.2 MGD.
Then the maximum day rate would be about 2.4 MGD. Therefore, you can see that
Staff feels it is time to begin the process of constructing a new well now so
that we may have it on line by 1989.
As for the tower, in order to provide storage to equalize the peaks and reduce
the amount of pumpage required during peak hours, the industry standards
recommend about 40% of the maximum day demand. Applying this to our anticipated
demand in 1989 would require that we would have 0.96 million gallons of storage.
Storage for fire protection should amount to another 0.24 million gallons.
Page 2
Approve RFP for Engineering Services for Design and Construction of Well and
Water Tower - Continued
Therefore, the minimum storage that we would need today would be 1.2 million
gallons. Again, because of the anticipated water demand increases, resulting
from the Citys growth, Staff is recommending looking at the addition of a 1.0
million gallon storage tank. In addition to providing the adequate amount of
storage, this will also allow the City to take one tower out of service in order
to perform preventative maintenance task such as repainting and repairing ice
damage to the inside.
I will be available to discuss any aspect of this RFP with the Council if they so
desire.
CITY OF ROSEMOUNT
REQUEST FOR PROPOSALS
DESIGN & CONSTRUCTION OF MUNICIPAL WELL AND ELEVATED STORAGE TANK
PURPOSE
The purpose of this Request For Proposal (RFP) is to provide a means of
evaluating qualified consulting engineering firms in order to select the most
qualified and cost effective firm for the design and construction of a new
municipal well and elevated storage tank for the city of Rosemount.
SCOPE
The scope of this project is for the site selection, design, and construction of
a new 2.0 MGD municipal well and a 1.0 MG elevated storage reservoir for the City
of Rosemount.
EXISTING CONDITIONS
The Citys' current water supply system consist of three municipal wells drilled
down to the Jordan Aquafer. The total capacity of these wells is about 3.6 MGD.
However, one well, 0.75 MGD, is and will be limited to emergency pumping only an
should not be considered in total pumping capacity and needs. The Citys' current
storage consist of a 0.5 MG elevated storage tank within operating elevation of
between 1,075' MSL and 1,105' MSL at a head of 110' to 1451. Figure 1 shows the
overall Citys' water system including the three wells and elevated storage tank.'
The Citys' existing population is estimated at 7,000 and Figure 2 shows the
Citys' monthly water demand for 1987. Attached as Figure 3 is an excerpt out of
the Citys' MWCC Sewer Use Survey indicating the amount of water used by
classification.
PROPOSED IMPROVEMENTS
While the City is anticipating the need for a 2.0 MGD municipal well and a 1.0
MG water reservoir, the City will require the Consultant to recommend the
appropriate size of each should the Consultant feel a larger or smaller size
well or water reservoir would better suit the Citys' needs.
The well equipment shall be housed in a heated and well ventilated building. The
building shall contain the following equipment:
1.) Vertical electrically driven turbine pump with natural gas or diesel
engine backup
2.) Fluoride application
3.) Chlorine Dioxide application
4.) Microcat 9800 RTU for connecting into existing supervisory control
system.
The site selection for the well shall be made considering the possibility of the
City constructing a water treatment plant in the future.
The Consultant shall plan on providing a resident inspector throughout the
construction of the new well and elevated storage tank
As for timing, the City needs to have the well operational by late 1988 with the
elevated storage reservoir operational by spring of 1989.
QUALIFICATIONS
The Consultant shall submit the firm's qualifications and a client list of
references with the RFP.
The Consultant shall also include the names of the project management team the
Consultant purposes and also their individual qualifications along with the RFP.
FEES
The Consultant shall include the purposed method of payment for this project with
the RFP, ie. cost plus fixed fee, percentage, etc.
RFP SUBMITTALS
The following is a minimum list of submittals that the City will require for this
RFP:
1. A letter explaining the Consultants understanding of the project.
2. The Firm's qualifications.
3. List of past municipal well and water storage projects and clients.
4. List of project management team and their individual qualifications.
5. Outline of project schedule including task and estimated man hours.
6. Project fee basis and rates.
SELECTION CRITERIA
Staff will select the Consultant based on, but not limited to, the following
areas:
1. Experience of firm and project management team
2. Firms accountability record
3. Engineering fees
4. Timetable
V 7
1987 WATER DEMAND
32
30-
28-
26
02826 25.484
24
22
2t1 19.871
18.236
18 16.892 17.215
z 16 15.391
14 13,861 13.4
1.862 11.927
12 11.403
10
8
6-
4
2- ro
0
Jon Feb Mor Apr May Jun Jul Aug Sep Oct Nov Dec
MONTH
t
Survey'of Sewer Use Data f0^87
Page Three'
Municipality CITY OF ROSEMOUNTt�' w` , r.r�>;4
C.
,.
5. Unit of geaSUre Mt Ga I Ions
'`•' , "
'
• Total Municipal Water Rapped in 1987
j
'>'s'� yI
Municipal Water
Sold in 1987
r
Second Quarter 66,395,000
y
Third Quarter 128,965,000
FIRST
SEM/l'gJ
Fourth Quarter 42,712,000
QUARTE[t
lHM raJRM
AR'M
TOTAL,
273,264;000:.
Q
QUAR'T'ER Q(lARM
2C7M
t ,
1.
Residential27:000
26,0
40.03 7.00d 48�19�� 3�.iQlL.1.r.M0
1dF,�,j211 000
' t� � w
flow from hate water1987,`!',,
pIr supplies and estimated flaw for ;;t
btiJl'1l{Li{./1.'M7
2.
Institutional 2,055,000
2,491,000'' 3,898,000
2,561 A00 ' `' 11 '.005, 000
3.
Coamercial
2,739,000'
4,494,000,-5,443,006
3,322,000 ' '15;9 000
2. Institutional (vo-Tech)_ l
9 658 .3 (i�
`^
4.
Industrial.
1,064,000
1, 062,00013,000
1,166��,305000 r
leyy
4. Industrial (Winko)
88, 2(D
q
_
TOTAL FCR YEAR 31, 885, 000 48, 084, 000 ` 56,5137#000 `' 39, 090,}000 177, 632;000
5. Unit of geaSUre Mt Ga I Ions
'`•' , "
'
• Total Municipal Water Rapped in 1987
First Quarter 35,192,000
F
r
Second Quarter 66,395,000
Third Quarter 128,965,000
S,.
Fourth Quarter 42,712,000
.t
TOTAL,
273,264;000:.
Provide number of sewer connections that are
furnished with
flow from hate water1987,`!',,
pIr supplies and estimated flaw for ;;t
btiJl'1l{Li{./1.'M7
1iVin
1. Residential
2. Institutional (vo-Tech)_ l
9 658 .3 (i�
`^
3. Commercial (Union 76) _.
41 �.
4'`'
q,
4. Industrial (Winko)
88, 2(D
q
FIGURE 3.
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