1g. South Lotus Lake Boat access accept plans & authorize bids I CITY OF je.
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. _i CHANHASSEN
:411r. • 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937-1900 • FAX (612) 937-5739 ✓ U Pt-
IMEMORANDUM 1
TO: Don Ashworth, City Manager , „'
I FROM: -7-7/
Todd Hoffman, Park and Recreation Coordinator
- '5-1-�
IDATE: March 21, 1991
SUBJ: Approve Plans and Specifications and Authorize
Advertisement for Bids for South Lotus Lake Boat Access
I Grading, Drainage and Landscaping Improvements, Project
90-18
I The attached plans and specifications for the above mentioned
improvement project have been prepared in response to City Council
action taken on February 25, 1991 approving such. As you recall,
the revised total estimated cost of this project is $33, 314 . 00.
I These plans have been submitted to the Engineering Department for
final review prior to distribution to bidders. To ensure timely
completion of these improvements, the following preliminary project
Ischedule has been established.
City Council: Accept Plans and Specs March 25, 1991
Iand Authorize Advertisement for Bids
Bid Opening April 16, 1991
10: 00 a.m.
ICity Council: Award Bid April 22, 1991
IBegin Construction May 6, 1991
Complete Construction June 14, 1991
1 A great deal of consideration has been given to ensure that
neighboring residents and boat access users are minimally
inconvenienced during this outlined construction period. The
I Minnesota fishing opener occurs shortly after construction is to
begin. Work activity has been limited to 7:00 a.m. to 7 : 00 p.m.
weekdays, with no weekend work allowed to help ensure weekend boat
I access traffic flows smoothly. The twelve hour a day work schedule
has been imposed to ensure early morning and late evening
disruptions of the neighborhood do not occur. It is also noted
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Mr. Don Ashworth
March 21, 1991
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that at a minimum, one lane to the boat access will be open during
the construction period.
' Finding these plans and specifications for the South Lotus Lake
Boat Access Improvement Project complete and satisfactory, it is
recommended they be approved and authorization for bidding be
given.
' Attachments
1. Plans and Specifications
' 2 . Proposal
3 . Memo dated February 21, 1991, Amendment to Site and Drainage
Study, South Lotus Lake Boat Access
cc: Charles Folch, Assistant City Engineer
Scott Harri, Van Doren Hazard Stallings
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CITY OF
CHANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937-1900 • FAX (612) 937-5739 1
MEMORANDUM 1
TO: Don Ashworth, City Manager
FROM: Todd Hoffman, Park and Recreation Coordinator 1
DATE: February 21, 1991
SUBJ: Amendment to Site and Drainage Study, South Lotus Lake
Boat Access
Note: Please bring your copy of the Site and Drainage
Study for the South Lotus Lake Boat Access as included in
the February 11th packet. If you cannot find your copy,
please call me.
Attached please find Amendment No. 1 to the above mentioned
project. Per the request of Mayor Don Chmiel, the improvement
project as initially presented was revised enabling the total
probable cost estimate to be reduced while not compromising the
effective life of the improvements. Specific questions raised at
the February 11, 1991 City Council meeting are also addressed in
the report. It is my belief that the total estimated savings of
$7 , 275. 00 for this project meets the desired intent of this
amendment. Please note that the estimated expenditures from the
Park Acquisition and Development Fund now totals $4 , 136.20.
Recommendation 1
It is recommended that the City Council approve the South Lotus
Lake Boat Access Site and Drainage Study as amended; amend the 1991
Park Acquisition and Development Capital Improvement Program to
include expenditures of up to $8, 000 for this project; and
authorize the preparation of plans and specifications. 1
City Council Action - February 25, 1991
Councilman Wing moved, Councilman Workman seconded to approve the 1
Revised South Lotus Lake Boat Access Study and authorize
preparation of plans and specifications. All voted in favor and
the motion carried unanimously. 1
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INtk,E Or 3 1
VanDoren
f _ Hazard
Stallings,Inc.gs,
Architects • Engineers • Planners
' February 20, 1991
Mr. Todd Hoffman
Park & Recreation Coordinator
' City of Chanhassen
690 Coulter Drive
P. 0. Box 147
Chanhassen, MN 55317
Ref: Amendment No. 1
Site and Drainage Study
' South Lotus Lake Boat Access
VHS Project No. 90-312
' Dear Todd:
This letter is in response to your review comments and questions
concerning various aspects of the Study and Report. Firstly, we
' wish to clarify a statement we made about the detention ponds
"frequently" overflowing. This comment was intended to illustrate
the fact that the additional volume of storm water runoff was
exceeding the pond system capacity more often than initially
predicted. As is normal practice, these ponds were originally
sized for the runoff from a 100 year storm. A 100 year storm means
that there is a one ( 1) percent probability of the storm event to
occur - hence the saying "A 100 Year Storm. " With a larger
drainage area now upstream of the ponds, it takes a much smaller
storm to produce the same volume of runoff. These storms are
' predicted to occur more frequently and in fact did occur on several
occasions during the past 2 years.
' Another matter concerned the proposed plant materials. All plant
material meets the City ordinances concerning size. The "caliper"
inches are noted next to each species designation on the plan. The
sumac ground cover is intended to improve the erosion resistance of
' the soil cover and will blend in rather well with the existing
sumac on the hillside.
' The final issue is a response to an overall need to review proposed
improvements and trim project costs where possible. We would
recommend the following changes be made to reduce the cost while
' not reducing the effective life of the improvements:
1. Place large size rip rap stones as slope protection along the
south half of the lower retention pond in lieu of field
' stones. Cost savings are estimate to be $5,330.00.
2 . Revise outlet structure and pipe system. Cost savings
estimated to be $400.00.
3030 Harbor Lane North, Bldg. II, Suite 104, Minneapolis Minnesota 55447-2175 (612) 553-1950
I
estimated to be $400.00. I
Mr. Todd Hoffman
February 20, 1991
Page 2
Enclosed P lease find a revised Estimate of Probable Cost. The
revised Total Estimated Construction Cost is $33,314 .00 or
$7,273.00 less than initially estimated. The reduced cost is
attributable to the following items: .
Item Savings
1. Rip Rap Slope Protection $ 5,330.00
2 . Outlet Control Structure Revision 400.00
3. Contingency 573.00
4 . Plans, Specifications, Bidding,
`Staking and Inspection 970.00
TOTAL ESTIMATED SAVINGS $ 7,273.00
The reduced project cost will also favorably impact the financing
in the following manner:
Total Estimated Project Cost $33,314 .00
Less Soil Conservation Service Grant 5, 177 .80
Less Environmental Trust .Fund $24,000.00
Balance from Park Acquisition and Development Fund $ 4, 136.20
These changes have resulted in a positive economic impact to the
project. We hope we have addressed your concerns satisfactorily.
If you have any questions, please call.
Sincerely,
VAN DOREN HAZARD_STALLINGS, INC.
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R. Scott Harri, P.E.
Enclosure
RSH/ev
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