HomeMy WebLinkAbout5.b. Rural Water System Update26 2875 145111 ` I W
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ROSEMOUNT, MINNFS()TA 5',f)(ift
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February 12, 1988
TO: Mayor Hoke
Councilmembers: Napper
Oxborough
Walsh
Wippermann
FROM: Stephan Silk, Administrator/Clerk
RE: Rural Water System Update
Gentlemen;
Attached you will find a letter from Gordon Kraus, Engineer for
DeWild Grant, Richert and Associates Co., this is the firm
designing the rural water system for the U & M. I believe the
letter is quite clear as to the question before us and that is
whether to consider the utilization of the water tower as the
holding facility for the system or not.
Staff's review of this proposal at this writing has been minimal
and we will complete discussion and be prepared to discuss it at
our meeting on Tuesday.
At first blush we have only the concern about upkeep costs on the
tower even if it is brought up to a quality maintenance condition
level. Other issues I believe would have minimum concern. Though
we don't wish to hold up this project it is possible we may not
be prepared to recommend a position on it until our March lst
meeting but on Tuesday we will attempt to come to a consensus on
it.
dck
DeWild Grant Reckert & Associates Co.
Architecture Engineering and Planning
315 First Avenue RECEIVED
Rock Rapids, Iowa 5'1246
(712) 472-2531
February 8, 1988 FEB 111988
CLERK': OFFICE
Mr. Raymond J. Jackson, P.E. CITY OF ROSEMOUNT
Engineering and Architecture
Room 100 Shops Building
319 15th Avenue SE
University of Minnesota
Minneapolis, MN 55455
City of Rosemount
2875 145th St. W.
Rosemount, MN 55068
Attn: Steve Jilk, Administrator
Re: Rosemount Rural Water System
DGR Project No. 3776
Gentlemen:
This is to request the approval of the City of Rosemount and the
University of Minnesota of the concept I discussed individually
with you last week. We feel there are distinct advantages to
both the University and Rosemount to incorporate the existing
University Research Center elevated tank into the proposed rural
water system. This letter will detail these advantages and
provide background information so that both parties can respond
in a timely manner. In order to maintain the work schedule
required to complete the construction of this project during the
1988 construction season, we need your response by Feb. 17.
Background Information
The project area is within the City Limits of the City of
Rosemount, located in Dakota Co. The western portion of the City
has developed into a high density housing area and has a water
supply, distribution, and storage system relying on a -number of
wells within that portion of the City. The eastern part of the
City is predominantly rural in character with scattered home
sites and farms which rely on individual wells finished in the<
Prairie due Chien or Jordan aquifers. Because of chloroform
contamination in approximately 27 of these wells it has been
determined that a rural water supply system should be built by
the University of Minnesota to serve as a replacement domestic
water supply for the polluted wells. The system would be
designed to allow for expansion to serve up to a total of 201
3460 West 38th Aveniee 1051 Off icfr Park Road 600 Sioux City I" ederat Plaza BIdq 1't'M F asr, 1401 5trofl'
Denver, Colorado 00211 Wi,!;t Df=s Wines. Iowa 50265 Sioux City. If1wa i )1f11 'iwuy I , 1I7,. CiouLh Dakota 57104
(303) 458-0311 (515) 225-8346 17121277-3049 tEi05) 339-4157
February 8, 1988
Page Two
City of Rosemount
connections which may ultimately be affected by the pollution
plume origination from the Research Center. The City of Coates
has also requested service from the proposed system. After
construction the system would be given to the City of Rosemount
for operation and maintenance.
Initial Plannin
During the initial planning stages of the proposed rural water
system, three alternative water sources were considered as
follows:
1. Connection to the existing City of Rosemount system.
2. Construction of two new wells.
3. Utilize the existing Research Center water system.
These alternatives were presented to the City of Rosemount and
the second alternative, construction of two new wells, was
selected. Planning proceeded based on this alternative. The
initial design concept was to provide service to the initial 27
connections and up to 201 total connections utilizing a small
hydropneumatic tank to balance peak flows with the well pumping
capacity.
Dakota Co. AVTI
During the design development phase the City requested that the
new facilities also serve the Dakota Co. AVTI This was a
reasonable request since the relatively large water use of this
facility would allow the City to spread their fixed operating
cost over a larger water use amount and thus reduce the cost per
1,000 gallons of water to the rural customers and bring these
costs down to the same range as presently experienced in the
balance of the City water systema
Because the new well and hydropneumatic tank facilities could not
provide adequate flows for fire protection, it was suggested that
the Research Center would continue providing fire protection by
retaining the connection of their system to the exterior main and
fire hydrants at the AVTI and that the new supply would serve the
inside water needs of the facility. The effect of this would be
to drastically reduce the amount of water supplied by the
Research Center, leaving a small number of water using facilities
within the Center. We anticipate that because of demand
reductions due to this change, the Research Center elevated tank
would have very little water turnover and will likely freeze
during the winter unless recirculation and/or water heating
facilities are constructed. Because fire protection will need to
be provided to the AVTI, removing the tank from service is not a
viable alternative unless a substitute facility is constructed.
February 8, 1988
Page Three
City of Rosemount
The addition of the AVTI also had a significant effect on the
well/hydropneumatic system planned as the rural water supply.
Instead of a modestly sized hydropneumatic tank and well pump
system, a tank of 7 feet in diameter by 19 feet long with two 40
horsepower well pumps would be required.
Because of this, we have approached both the University and the
City with the suggestion that the Research Center tank and
connecting pipeline become a part of the proposed rural water
system. Both parties have agreed to seriously consider this
concept.
The Universitv Research Center Water System
The University Research Center elevated tank has a capacity of
50,000 gallons. It was constructed in 1941 as part of the Twin
Cities Arsenal. The tank is part of a water distribution and
supply system serving the Research Center as well as the Dakota
Co. AVTI adjacent to the Research Center.
The water supply consists of one primary and one standby well
finished in the Prairie du Chien and the Jordan aquifers.
Distribution is by cast iron mains, presumably constructed at the
same time as the elevated tank. A 10" diameter cast iron main
connects the Research Center system to the AVTI.
Proposal Summary
The proposed system would consist of two new wells and a control
building on the old City Hall site with a connecting main to the
existing Research Center system and the new rural users. Sensors
in the Research Center elevated tank would transmit level
information to the control building and well pumps would be
automatically staged on and off to keep the elevated tank full.
A complete preliminary design is currently being developed for
these facilities and will be reviewed with the University and the
City at a later date.
There are a number of details that will need to be worked out in
order to transfer ownership or control of the elevated tank from
the University to the City. Some of these include the following:
1. Who will supply water to the Research Center facilities? We
suggest that the City sell water to the Research Center at
the existing City water rates.
2. What will happen to the existing Research Center wells? We
suggest that they be inspected, and if they meet health and
safety standards, the City accept ownership and then
maintains them as a backup source only.
February 8, 1988
Page Four
City of Rosemount
3. What is the condition of the elevated tank? We suggest an
inspection by a qualified engineering firm, determine a
maintenance schedule, and complete initial maintenance by
the University before transfer to the City.
4. What about the balance of the Research Center distribution
pipeline not part of the connecting pipeline between the new
water source and elevated tank? We see no reason for the
City to own this. Because it may be needed to serve
facilities at the Research Center, the University will
probably need to continue maintaining these lines or
contract with the City for this service.
We recognize that other significant details need to be dealt with
but ask that to expedite matters, agreement be reached in
principle on the general concept by February 17 so that our
design work can proceed. The general concept is that the City
accepts ownership of the Research Center elevated tank and
connecting main so that these facilities can become a part of the
proposed rural water systema
Additional information, such as the anticipated water needs of
the new system, is enclosed with this letter or is available in
your files. We are available to answer additional questions you
may have and can attend meetings at the University or City if you
feel this might be helpful. To illustrate the importance of a
timely decision, we also include a copy of our work schedule
dated January 6, 1988. You will note that we had anticipated
starting January or early February but cannot proceed with this
phase until this matter is settled. A new schedule is being
developed based on a determination of this matter by February 17
and will move bid letting into May or June with construction
start in June or July. Additional delays will jeopardize the
completion of the project this construction season.
We look forward to your response.
Sincerely,
DEWILD GRANT RECKERT
& AS CIATES COMPANY
1.�
Gordon B. Krause, P.E.
Project Manager
GBK:kld
cc: Fay Thompson
Mark Longson
ROSEMOUNT RURAL WATER
ESTIMATED WATER NEEDS
October 1987
(Revised February
1988)
Average Day
Peak Day
(gallons)
(gallons)
PRESENT NEEDS
Rural (27
connections)
4,000
11,000
AVTI
32,000
81,000_
Coates
12,000
31,000
Water loss
(20%)
10,000
25.000
Total
58,000
148,000
FUTURE NEEDS
Rural (201
connections)
30,000
75,000
AVTI
32,000
81,000
Coates
12,000
31,000
Water loss
(20%)
15.000
37,000
Total
89,000
224,000
Rosemount Rural Water System
Project No. 3776
Project Work Plan
1/6/88
Revised"
Task
No.
Responsible
Target
Task
Party
Date
A. Preliminary
1.
Determine, service locations
DELTA
1/7
2.
Determine design water needs
DGR
1/15
3.
Determine location of wells
DELTA
1/7
B. Water
Source Design
1.
Site survey
D EI -7- 4 -DGR—
1/22
2.
Select design alternative
hydropneumatic storage or
variable speed pumping
DGR
1/15
3.
Subcontract architectural,
electrical, and mechanical
services and initiate work
DGR
1/22
4.
Size and select equipment
DGR
1/29
5.
Contact electrical power
supplier and request service
DGR
2/5
6.
Construct/test pump.pilot well
DELTA
1/29-
7.
Construct/test pump production
well
DELTA
2/26
8.
Soils investigation
DGR
1/29
C. Pipeline Design:
1.
Select pipeline route
DGR
1/15
2.
Size and class pipeline
DGR
1/29
3.
Locate meter and service line
%?_
1/22
4.
Locate valves and appurtenances
DGR
1/29
Task
No.
Responsible
Target
Task
Party
Date
D. Drawings and Specifications
1.
Obtain aerial photography
DGR
1/22
2.
Draft mapping
DGR
1/29
3.
Develop floor plan pump house
DGR
1/29
4.
Complete water source civil
drawings I
DGR
2/19
5.
Receive First Draft A and M&E
Drawings
DGR
2/19
6.
Prepare quantity takeoff pipeline
DGR
2/5
7.
Assemble contract doe's
DGR
2/19
8.
First Draft Civil Spec's
DGR
2/19
9.
Receive First Draft A and ME
Specs.
DGR
2/19
10.
Assemble First Draft and Cost
Estimate of complete Drawings
and Specs.
DGR
2/22
11.
Final Draft and Cost Estimate
Drawings and Spec's.
DGR
3/7
E. Permits and Right -of -Way
1.
Apply for county, R.O.W.
DGR
2/12
2.
Apply for state R.O.W,
DGR
2/12
3.
Apply for RR R.O.W.
DGR
2/5
4.
contact existing utilities
DGR
2/5
5.
Contact rural users
DELTA
1/22
M
Task
No.
Responsible
Target
Task
Party
Date
F. Reviews and Approvals:
1.
Preliminary design conference
with Rosemount
'DGR
1/14
2.
Review of First Draft,
Delta,
Rosemount, U. of M.
DGR
2/26
3.
Review of Final Draft,
Delta,
Rosemount, U. of M.
DGR"
3/11
4.
Dept. of Health Review
and
Approval
DGR
3/25
5.
Authorize Advertisement
for
Bids
U. of M.
4/1