1c1. Willow Ridge approve Plans & Specs .
CITYOF lc' ,_
1
1 ..., CHANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937 -1900 • FAX (612) 937 -5739
1 le NM Ply Oty Adminientor
MEMORANDUM b+dorsed ✓ ��
I irlodifler1 =
Dote Submitted to Commission
Rejected
TO: Charles Folch, City Engineer Dear 4. 2-‘72.-
1 FROM: Dave Hempel, Sr. Engineering Technician
■
DATE: April 1992 Dote Submitted to Council
P ril 8 q.)
1 SUBJ: Approve Plans and Specifications for WillowRidge - Project No. 91 -14
1 Attached are the construction plans for street and utility improvements proposed for WillowRidge. The plans
have been reviewed by staff and appear to be acceptable with the following recommendations:
I 1. The applicant shall resubmit new storm sewer calculations verifying that the storm sewer is adequately
sized and the number of catch basins are appropriate for a coefficient of runoff of between .45 to .50.
I 2. The applicant's engineer shall provide the City with hydraulic calculations to insure the watermain is
sized adequately to insure sufficient fire flow during peak demands. In the event the 6 -inch watermain
is not justified, the City will require enlarging the watermain to an 8 -inch diameter main. In addition,
1 connections to the existing City sanitary sewer and watermains on Lake Lucy Road will need to be
realigned to be continuous from WillowRidge Drive versus the jog as proposed on the submitted plans.
3. All of the City's lift stations and pump houses are monitored by the City's new telemetry system. The
I proposed lift station should also be incorporated into the City's telemetry system. The applicant shall
be responsible for compensating the City for one -half of the cost to install the telemetry system. The
telemetry system is estimated to cost $12,000. Therefore, staff recommends the applicant be required
1 to provide the City with a cash escrow in the amount of $6,000. The City will initiate a future project
to have the telemetry system installed once the lift station has been completed and operational.
1 SPECIFICATIONS
Specifications for WillowRidge are not attached to this item; however, staff has administratively reviewed the
I document and finds it acceptable subject to minor changes which are being amended by the applicant's engineer.
Therefore, it is recommended that the City Council approve the construction plans prepared by Sathre - Bergquist,
Inc. dated February 21, 1992, revised April 1, 1992 along with the specifications dated March 20, 1992
I conditioned upon the recommendations stated herein.
OFFICIAL ENGINEERING COPY
ktm Received _
1 c: Michael Pflaum, Lundgren Bros. Revision No.
Bob Payette, Sathre-Bergquist Approved by City Engineer
Date y -8 -1Z 46"
Approved by City Council
«' PRINTED ON RECYCLED PAPER Date
fr x 16
#
4. Improvements. The Developer shall install and pay for
the following:
1 A. Sanitary Sewer System
B. Water System
C. Storm Water Drainage System
D. Streets
E. Concrete Curb and Gutter
F. Street Signs
' - G. Street Lights
H. Site Grading
I. Underground Utilities (e.g. gas, electric,
telephone, CATV)
' J. Setting of Lot and Block Monuments
K. Surveying and Staking
L. Lift Station
' 5. Time of Performance. The Developer shall install all
required improvements by November 15, 1993. The Developer may,
however, request an extension of time from the City. If an
extension is granted, it shall be conditioned upon updating the
security posted by the Developer to reflect cost increases and the
extended completion date.
6. Security. To guarantee compliance with the terms of this
Contract, payment of special assessments, payment of the costs of
' all public improvements, and construction of all public
improvements, the Developer shall furnish the City with a letter of
credit from a bank, cash escrow, or equivalent ( "security ") for
$459,426.00. The amount of the security was calculated as 110% of
1 the following:
Sanitary sewer $ 73,000.00
Watermain $ 37,400.00
On -site storm sewer $ 42,600.00
Streets. $ 89,500.00
Street lights and signs $ 1,250.00
Erosion control $ 9,600.00
Engineering, surveying, and inspection $ 37,210.00
Grading $ 80,000.00
Iron Monuments $ 1.100.00
Lift Station and Telemetry System . . . $ 46,000.00
TOTAL COST OF PUBLIC IMPROVEMENTS . . . $417.660.00
This breakdown is for historical reference; it is not a restriction
on the use of the security. The security shall be subject to the
approval of the City. The security shall be for a term ending
December 31, 1993. The City may draw down the security, without
notice, for any violation of the terms of this Contract. If the
required public improvements are not completed at least thirty (30)
days prior to the expiration of the security, the City may also
draw it down. If the security is drawn down, the draw shall be
used to cure the default. With City approval, the security may be
reduced from time to time as financial obligations are paid, but in
1 SP -2
a,
1 Council: The Developer shall convey to the City a temporary street
• easement for the temporary cul -de -sac.
' U. If after three years from the date the final plat is
approved by the City Council, the remaining public utility and
street improvements (Phase II) are not constructed, the City shall
I proceed with a 429 public improvement project and assess the costs
back to the benefitting properties. The developers and /or property
owners shall waive any and all procedural and substantive
objections to the special assessment, including but not limited to
hearing requirements and any claim that the assessment exceeds the
benefit to the property. Notice of future street extension shall
be placed in the chain of title for all WillowRidge property
1 owners.
V. The developer shall notify all future property
' owners adjacent to the proposed lift station on Willowridge Court
that the City will be installing a 25 foot high antenna to the lift
station to accommodate the City's telemetry system.
11 W. The Developer is responsible for reimbursing the
city a sum of $455.00 for engineering services from Bonestroo,
Rosene, Anderlik & Associates for review of storm water /water
' quality impact of the Ortenblad /Ersbo development.
X. The proposed lift station shall be incorporated into
the City's telemetry system. The City will initiate the
installation of the telemetry system once the lift station has been
completed, tested and operational. The Developer shall be
responsible for compensating the City for one -half of the cost to
' install and equip the lift station with the telemetry system. The
telemetry system is estimated to cost $12,000.00. The Developer
shall be required to provide financial security with the City in
' the amount of $6,000.00 to guarantee repayment to the City for
their share of the telemetry system.
' Y. The Developer shall resubmit new storm sewer
calculations verifying that the storm sewer is adequately sized and
the number of catch basins are appropriate for a coefficient of
runoff of between .45 to .50.
1 Z. The Developer's engineer shall provide the City with
hydraulic calculations to insure the watermain is hized adequately
' to insure sufficient fire flow during peak demands. In the event
the 6 -inch watermain is not justified, the City will require
enlarging the watermain to an 8 - inch diameter main. In addition,
connections to the existing City sanitary sewer and watermains on
' Lake Lucy Road will need to be realigned to be continuous from
WillowRidge Drive versus the jog as proposed on the submitted
plans.
' 9. General Conditions. The general conditions of this
Contract, approved by the City Council on February 22, 1988, are
' attached as Exhibit "B" and incorporated herein.
SP -6