1a. Plans & Specs Bluff Creek Dr. w. Ci
CITY OF
CHANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 1 (612) 937-1900
MEMORANDUM
TO: Don Ashworth, City Manager
1
FROM: Gary Warren, City Engineer «
1
per
DATE: March 9 , 1988
1 SUBJ: Approval of Plans and Specifications for Bluff Creek Drive
City Project No. 80-5
On April 6 , 1987 , the City Council authorized preparation of
construction documents for Bluff Creek Drive road improvements.
1 This is based on the feasibility study prepared by Engelhardt and
Associates dated March 11, 1987 . The attached plans have been
prepared in accordance with this feasibility study.
The roadway which is an existing 22-foot wide gravel road in poor
condition, is proposed to be upgraded utilizing the City' s rural
1 standard section, i.e. 24-foot roadway with drainage ditches
from County Road 14 (Pioneer Trail) to West Hesse Farm Road. The
southern portion of the roadway from West Hesse Farm Road to
Trunk Highway 212 will be the City' s urban roadway section uti-
lizing barrier concrete curb and gutter and storm water drainage
piping to properly handle the runoff and slope difficulties in
this area.
1 The steepest grade on the new design is 8% . As anticipated, a
certain amount of muck excavation will be necessary to address
the poor soils on the north half of the project. What was not
1 anticipated in the feasibility study however, is the need for
concrete crib retaining walls along the tighter portion of the
roadway corridor from the railroad tracks ( station 56+75) to just
1 past the Bed and Breakfast (HSE no. 1161) station 64+00. This is
a trade-off between the cost that would be otherwise for property
acquisition and extensive side slope grading.
1 The horizontal alignment of the road has also been improved in
particular at the location of the Bed and Breakfast where we have
jogged the road 10 feet to the northeast to get further away from
1 the Bed and Breakfast property. This had an impact in increasing
our retaining wall quantities but is a necessary improvement for
clearance in this area.
1
1
•A '
Don Ashworth
March 9 , 1988
Page 2
The feasibility study estimated the total project cost to be
$535, 282 . The revised engineer' s estimate including the 30%
mark-up for contingencies, legal, administrative and engineering
is $667, 580 or an additional $132 ,298. This increase results
directly from the need for retaining walls which had not been
anticipated in the feasibility study and which is estimated to
cost $146,398 including the earth fill.
When Council accepted the feasibility study, they indicated a
preference for assessing 20% of the project costs to benefitting
property owners . The remaining cost would then be paid from the
City' s Municipal State Aid (MSA) funds . The feasibility study
envisioned that this would encumber a little over two years of
State Aid allotments based on $215,000 of annual allotment being
received from the State. Fortunately, we have recently received
the State Aid Apportionment Report for 1988 which indicates that
the City' s State Aid construction allotment has increased by
$62, 365 for a total 1988 construction allotment of $248,449 .
This year a significant amount of time was spent updating our
entire MSA "needs" reports to maximize the system needs . This,
coupled with the recent legislation which appears to have a good
chance of passing which will provide more state monies into this
fund (see administrative presentation item no. 16) , should assure
us that next year' s allotments should be as good as , if not better
than, this past year. If it remains the same and the construction
bids are as estimated by this recent engineering update, this
project will consume a little over two years of our State Aid
construction dollars ( see Attachment #2) . We obviously will be
closely watching the bidding process to see how the project pans
out as it relates to the engineer' s revised estimate and also the
allocation of State Aid funds in the future.
The plans are currently under review at the State Aid office and
we anticipate receiving State approval to proceed with the pro-
ject by the end of March. It is therefore recommended that the
City Council approve the plans and specifications for Bluff Creek
Drive improvements as prepared by William Engelhardt and
Associates dated February 19, 1988 and that staff be authorized
to advertise for bids.
Attachments : 1 . Area Map
2 . Feasibility Study Excerpt, Page 7
f A;t: Nr 1 UM -Ur.
...)",„ . .„
(
[ GI.
i J.
-1?
' Mai ' I \ 1:4319 ga II-
--1 \
1 Ng 11111
wi,ftwommIt
IA%
kr
I ...,
I ._.
1---1
1. illiir4e/p"
1 r
I ,
WI •
lit,I r illil!r1 I I 1.
z,' 2
I • a,
a. 1 --Z ""air-i--- 0 I
Ill 1111P
- ,-- -- _
L
I
I
. -
_i. Ahilitilip8 1 1111114mmii,,.4.....4
Ak ..., • •
111110
10
ui
C
I : I ' \
' .
i o..it. .
_
_
4/ _ ------... .. m.
_
141 _
.•
- 7-7----v?
I ,...,.,a1H4 ,,
1 :
. , _._ ...... ,c•
• LD ,
A
. .L.„1.;
.. _
.
. k_.
.
■ , / , \
----\\
-: i _ ..,_ =NM =MO
i I NW
.... I .
•
.
- .
Noenanv .
• ...
1 :
S .
-1
•:.,•.,..• - I\ .--• 0 .
4...v.:.;A:,..;
1
E x C vte T ruz. ,.., Fr30,41/4S i c 1 ri7 S7`L,,✓0
1
SUMMARY OF COSTS IZEV1SC il
C`STl % Al
Ige
TOTAL ESTIMATED PROJECT COST $ 535 , 282 .00 W01/ 5-
20% ASSESSED 1
Local Participation $ 107 ,056 .40 ¢I 33, - -
N.S.A. Funds $ 428 , 225 . 60 534) O(o‘k1
32% ASSESSED f 1
Local Participation $ 171 , 290 . 24 Z13� "`9
- M. S .A. Funds $ 363, 991 . 76 453,' S1
43% ASSESSED 1
Local Participation $ 230 , 171 . 26 4Z B7) OSCi
N.S .A. Funds $ 305 , 110 . 74 3_ )6Z-11
tt ASSESSMENT PER UNIT (Local Participation/66 Units)
di 1
20% Assessed $ 1622 . 07/Unit *Zc�Z3/Nv►+
ii 32% Assessed $ 2595 . 31/Unit 3 Z37/U�'1 1.
43% Assessed $ 3487 .44/Unit 43 491 Ltut+
I
0 f,5 3 4) I III 16 2 4B, 4
l is
g
1
g
•
I
I -7-
1
I
1