2d. Approve contract for Audubon Rd S. CITYOF
al cc
CHANHASSEN
F`- 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937 -1900 • FAX (612) 937 -5739
1
MEMORANDUM
TO: Don Ashworth, City Manager
FROM: Gary Warren, Acting City Engineer
1 DATE: January 8, 1991
' SUBJ: Approve Contract Amendment No. 1 for Audubon Road South
Improvement Project No. 89 -18
1 Attached is Contract Amendment No. 1 from Imperial Developers
regarding the subject project. As noted therein, the amendment
addresses seven revisions to the contract resulting from changes
' in field conditions such as saturated soils wherein additional
granular material, subgrade excavation and geotextile fabric was
warranted, to the inclusion of additional storm drainage
facilities to deal with unanticipated runoff. All changes were
reviewed with this office personally in the field prior to
authorization and I find the attached Amendment No. 1 in order
and consistent with the field authorizations.
The additional $12,867.09 covered by the contract amendment falls
in the non - assessable category and will be covered by the tax
increment funds. Therefore, no increase in the proposed
assessments for the abutting properties will be encountered by
this amendment.
1 It is therefore recommended that the City Council approve
Contract Amendment No. 1 in the amount of $12,867.09 revising the
total contract authorization to $602,615.22. Similarly, the
1 contract schedule should be extended by 13 days to address this
increase in work. The revised substantial completion date
therefore should be approved at October 28, 1990.
ktm
Attachment: Contract Amendment No. 1
c: Chet Harrison, HNTB
1
1
CHANGE ORDER NO. 1 ; - r
IMPERIAL DEVELOPERS, INC.
AUDUBON ROAD SOUTH UPGRADE
City Project No. 89 -18
This contract is hereby amended as follows:
General Statement:
1 Unit price quotations contained in the Item, Unit Price, Quantity section of this
supplement shall be the basis of payment for labor and /or materials furnished
to complete the work described herein. The actual payment will be computed
' by multiplying the unit price by the field measured quantity for the particular
work item. A cost summary of the change order additions or deductions
follows the work description and justifications.
1. The engineer has authorized the contractor to provide 32 feet of 36" RCP Class
II, 1 - 36" RCP Class II Apron, 1 A -27C Trash Grate, 6.6 CY of Grouted
Riprap Class II. This addition to the contract is in reference to the concrete box
culvert. The 36 inch pipe will be installed in the side of the box in lieu of a
1 drop inlet on the top of the box culvert. All other materials involved with the
installation of the pipe will be incidental to the cost of the pipe. ($3,507.49)
' II. The engineer has authorized the construction of an additional inlet structure
adjacent to the Michels property to reduce erosion along Audubon Road.
($1,400.00)
1 III. Due to the high moisture content in the subgrade of Audubon the engineer
authorized the geotextile fabric to be sewed together to increase the strength
of the fabrics interconnection. ($616.00)
IV. Mr. Michels had a drainage problem adjacent to Lyman Road, the engineer
1 authorized the contruction of the new ditch to improve drainage. ($818.00)
V. Saturated subgrade was discovered adjacent to the Barinsky property on
Audubon Road. A special granular backfill material was authorized by the
engineer to stabilize this portion of the roadway. ($5,121.60)
1 VI. Additional storm sewer aprons were required on the project. The engineer
authorized the addition of these aprons.($1,220.00)
VII. Following award of the contract, it was decided to change the catch basin
grates to improve maintenance and capacity of the inlets. The engineer
' authorized this change. ($184.00)
Net increase in the contract due to this change order is an additional $12,867.09.
1
1
• CHANGE ORDER NO. 1
SUMMARY
1
ITEM NO. DESCRIPTION UNIT PRICE QUANTITY AMOUNT
ADD TO QUANTITY: I
SEWING GEOTEXTILE LS 616.00 1 616.00
I
DITCH CONSTRUCTION LS 818.00 1 818.00
CHANGE CASTING ASSY EACH 46.00 4 184.00
MANHOLE SPECIAL EACH 1,400.00 1 1,400.00 1
2105.525 GRANULAR BORROW (LV) CY 7.76 660 5,121.60
2503.511 12 "RC APRON SEWER 11 EACH 230.00 1 230.00
2503.511 15 "RC APRON SEWER 11 EACH 330.00 . 3 990.00 I
2503.511 36 "RC PIPE SEWER 11 LF 48.00 32 1,536.00
2503.511 36 "RC APRON SEWER II EACH 550.00 1 550.00
A -27C TRASH GRATE, 36" EACH 850.00 1 850.00 ,
2511.507 GROUTED RIPRAP CL II CY 86.59 - 6.6 571.49
1
TOTAL CHANGE ORDER NO. 1 $12,867.09 1
The original Contract Sum was $589,748.13
I
The net change by previously authorized Change Orders 0.00
The Contract Sum prior to this Change Order was $589,748.13
The Contract Sum will be increased by this Change Order $12,867.09 1
The New Contract Sum including this Change Order will be $602,615.22
The Contract Time Will be changed by 13 Days I
The Date of Substantial Completion is October 28, 1990 I
1
&,J... i--.1° AP 1
C n r actor „q . 12,1 Owner Engineer / 9 1
CHANGE/13831 /1 1
1