1f. Contract Amendment for Lake Drive/TH101 Realignment I
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il : CITY OF 14,
I . ) - ,
..,_ . .. t . CHANHASSEN
690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937-1900 • FAX (612) 937-5739
Iu Action by City Administrator
MEMORANDUM
Endorsed ✓1 1 '
' T0: Don Ashworth, City Manager Modified_____._
FROM: Gary Warren, City Engineer lk_ pate Subm'tfea to Cc°,^Issiott
IDATE: March 7, 1990 ---- -
SUBJ: Approve Contract Amendment No. 2 for Lake Drive/TH 101 -/Z-10
II Realignment Improvement Project No. 88-22A
I Contract Amendment No. 2 is attached and has been prepared to resolve all
quantities and pay items outstanding from the 1989 construction effort. The
attached March 6, 1990 correspondence from BRW and the attached contract amendment
Iin detail summarize the specific construction elements warranting the amendment.
As noted therein, the net impact of the amendment is a minor add to the contract
II in the amount of $4,982.23 for a revised contract ceiling amount of
$2,299,133.07. The biggest portion of the amendment relates to the poor soils
encountered on the project in Surcharge areas A and B. Following the
reccannendations of our soil consultant, STS Consultants, it was decided to use a
I more conservative and structurally sound ,tackfill material, i.e. select
granular, to stabilize the muek excavation areas. While estimates were made
during the design phase based on soil boringsvit is not unca mon to see field
I changes of this nature necessitated since soil borings still give us a pretty
small window in which to extrapolate soil conditions. In addition, the clays of
Chanhassen change dramatically with moisture content which also is difficult to
forecast. Fortunately, the topsoil condition on the project has been better
I than anticipated and we see compensating factors at work which have resulted in
a modest contract increase.
II This office has been intimately involved with the field decisions which have
been made relative to the elements of this contract amendment and I am satisfied
that the unit prices and lump sums which have been negotiated are reasonable and
appropriate for the work conducted. The attached Contract Amendment No. 2 is
Itherefore recommended for approval in the amount of an add of $4,982.23 for a
total revised contract ceiling amount -of $2,299,133.07.
II ktm
Attachments: 1. March 6, 1990 letter from BRW.
I2. Contract Amendment No. 2.
c: Gary Ehret, BRW
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PLANNING
OILS TRANSPORTATION
MI B 'S r ENGINEERING
URBAN DESIGN
r BR W. INC THRESHER SQUARE 700 THIRD STREET SOUTH MINNEAPOLIS.MINNESOTA 55415 PHONE 612'370-0700 FAX 612/370-1378
March 6, 1990
City y of Chanhassen CITY OF CHANHASSEN
' 690 Coulter Drive n��� D
Chanhassen, MN 55317 W
Attn: Mr. Gary Warren, PE MAR 07 1990
' City Engineer ENGINEERING �T
RE: Contract Amendment #Two (2) ENG�[�1G DK �
' Lake Drive CP 88-22
Dear Mr. Warren:
' Over the past six weeks we have been working with the project contractor,
Northdale Construction, in an attempt to resolve all quantities and items of
work that have been completed in 1989. Having recently completed this task, we
' have assembled a contract amendment that resolves any remaining issues from this
past years construction.
Most of the items on this contract amendment are not the result of major changes
in scope of the project, but rather are items of work that were completed but a
unit bid price had not been established prior to this contract amendment.
' The most significant changes were the result of field decisions made by the
Soils Testing Company (STS) in direct response and recognition of the soil types
and characteristics which we encountered during construction. Specifically:
1. The deep muck excavation areas and surcharge fill areas were bid assuming
common borrow for backfill. However, the depth of the fills and the
moisture content of the on-site clays made it much more desirable to use
' select granular borrow rather than common borrow in order to avoid dif-
ferential settlements from occurring.
' As a result, the plan quantity of select granular borrow has been increased
significantly while the plan quantity for common borrow has been reduced by
an equivalent amount.
' 2. The muck depths in the area of Surcharge B were too deep to support the
storm sewer and water main without special construction. A special
"pillow" was designed by STS to support these utilities through
' Surcharge Area B. (Note that no utilities were constructed through
Surcharge Area A, except gas.)
' AN AFFILIATE OF THE BENNETT.RINGROSE.WOLSFELD.JARVIS.GARDNER.INC GROUP
DAVID J BENNETT DONALD N RINGROSE RICHARD P WOLSFELD PETER E.JARVIS LAWRENCE J GARDNER THOMAS F CARROLL CRAIG A AMUNDSEN DONALD E HUNT
MARK G SWENSON JOHN B McNAMARA RICHARD D PILGRIM DALE N BECKMANN DENNIS J SUTLIFF JEFFREY L BENSON RALPH C BLUM DAVID L GRAHAM
MINNEAPOLIS DENVER PHOENIX TUCSON ST PETERSBURG
Mr. Gary Warren
March 6, 1990
Page 2
3. The depth of the topsoil over the project area was significantly less than
anticipated; therefore, the plan quantity of common excavation, common
borrow, and muck excavation have underrun significantly.
Along with six copies of Contract Amendment #Two, we are transmitting six copies
of Partial Payment #Six for your approval . Partial Payment #Six brings us up to
date on all quantities as well as the items of payment on Contract Amendment
#Two.
We hope you find both items in order. We recommend that both be approved by
City Council at the next available meeting. pp y the
If you have any questions, please let me know.
Sincerely, ,
BRW, ,C.
,/
• y A /Ehret, PE
Projec Manager
GAE/sk
File 7-8912
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• arm Copy
L--e* Copy
Contractor Copy
!raper#or Copy
CITY OF CHANHASSEN
CONTRACT AMENDMENT
Project: TH 101 Realignment/Lake Drive
City Project No. : 88-22
' Amendment No. :
Date: (2) Two
March 12, 1990
Contractor: Northdale Construction Company, Inc.
The additions, revisions and corrections contained herein shall be made to the
Contract Documents for the project, and shall become a part of the Scope of
Work.
IIDescription of Changes:
I A. The Contractor has performed select granular borrow work, above and beyond
125% of the contract quantity. The additional granular borrow material was
required in substitution for common borrow due to modifications in the
' requirements for the surcharge sections, increases in the total muck area on
the project and modified fill requirements in the deep fill sections.
These changes were field modifications based upon the recommendation of the
' Soils Engineer after field examination of the existing soil conditions.
A new unit price for the additional granular borrow quantity has been nego-
tiated with the contractor based upon a summary of the actual time and
material costs of the work. A new unit item has been defined as follows:
Bid Schedule D - Roadway
II ADD
ORIGINAL QUANTITY
SEQ. NO./ CONTRACT INCREASE/ UNIT AMOUNT
IMn/DOT NO. ITEM UNIT QUANTITY DECREASE PRICE ADD/(DEDUCT)
57/ Select Granular CuYd 0.00 16,945.00 $7.70 $130,476.50
' 2105.522 Borrow (Excess)
(CV)
As a result of the substitution with select granular borrow, the contract
' quantity for common borrow may be reduced. A total reduction of 26,735
cubic yards can be made to the common borrow contract quantity.
' CA2-1
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The reduction in the contract quantity for the common borrow is detailed I
as follows:
Bid Schedule D - Roadway '
DEDUCT
ORIGINAL QUANTITY AMOUNT
SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
8/ Common Borrow CuYd $3.55 110,700.00 (26,735.00) ($94,909.25) '
2105.523 (CV)
A ,. Net Contract Change ADD $35,567.25
B. Specific areas of the contract work have been completed by the Contractor
and the final quantities identified. Changes in the site conditions from
those anticipated in the contract documents have resulted in significant
quantity underruns for these items. Because of the magnitude of these
underruns, these quantities are being included here for contract quantity
reduction.
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Bid Schedule D - Roadway ,
DEDUCT
ORIGINAL QUANTITY AMOUNT 11 SEQ. NO.! UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
5/ Common CuYd $1.90 69,800 (20,000.00) $38,000.06) '
2105.501 Excavation
Bid Schedule C - Storm Sewer
DEDUCT
ORIGINAL QUANTITY AMOUNT
SEQ. NO.! UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
38/ Park Pond & CuYd $2.62 45,000.00 (7,000.00) ($18,340.00)
2105.505 Ditch Muck
Excavation
$, Net Contract Change (Deduct)($56,340.00) '
C. The Contractor has constructed a rock and fabric "pillow" for utility '
installation in the surcharge areas on a time and materials basis. The
"pillow" construction was used to support the installation of temporary
storm sewer, permanent watermain and permanent storm sewer over very poor
soils in lieu of utility piling which was significantly more expensive.
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II Hourly rates for equipment and personnel were obtained from the Contractor
and approved by the Engineer prior to beginning the additional work. The
hourly rates and respective times required for each item are summarized
below. Equipment costs do not include the operator. The hourly rates
Iinclude all Contractor overhead and profit.
ITEM UNIT QUANTITY UNIT PRICE AMOUNT
II245 Backhoe HR 21.0 $138.98 $ 2,918.58
966 Loader HR 27.0 69.55 1,877.85
D8 Cat HR 20.0 93.97 1,879.40
ICompactor HR 26.0 32.46 843.96
Truck HR 35.5 44.00 1,562.00
Foreman HR 21.0 43.50 913.50
II Backhoe Operator HR 21.0 39.68 833.28
Loader Operator HR 27.0 39.07 1,054.89
Dozer Operator HR 20.0 39.07 781.40
Pipelayer HR 21.0 33.85 710.85
IIBottomman HR 21.0 33.65 706.65
Topman HR 16.0 32.94 527.04
IILabor & Equipment Cost $14,609.40
I he additional material required for the completion of the work is as
Idescribed below:
ITEM UNIT QUANTITY UNIT PRICE AMOUNT
IIAmoco Fabric 4557 SY 1,375.00 $ 1.49 $2,048.75
Limestone Aggregate Ton 672.33 8.03 5,398.81
Sand Ton 263.20 3.38 889.62
I18" Storm Pipe L.F. 307.00 16.22 4,979.54
Material Cost $13,316.72
IIThe temporary PVC storm sewer included in the contract documents can be
deleted as a result of the "pillow" construction. A total of 610 lineal
feet of 18" PVC and 2 bends have, therefore, been eliminated.
IIThe changes have resulted in the addition of a new lump sum bid item for
the "pillow" construction, as well as deletion of the temporary PVC storm
IIsewer items. The changes are detailed as follows:
Bid Schedule C - Storm Sewer
IORIGINAL QUANTITY AMOUNT
. . UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
II28/ 18" PVC SDR 26 LF $ 46.50 610.00 (610.00) ($28,365.00)
29/ 18" PVC Bends EA 250.00 2.00 ( 2.00) ($ 500.00)
' 50/ Pillow Const. LS 27,926.12 0.00 1.00 27,926.12
c , Net Contract n ract Change (Deduct) ($ 938.88)
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D. The Contractor performed work on a hourly basis to pothole the ground above I
the existing 18" water main along Lake Drive to determine the watermain
depth. The equipment and labor time required for the completion of the work
is as follows: I
ITEM UNIT QUANTITY UNIT PRICE AMOUNT
D6C (w/o Operator) HR 1.0 $ 49.35 $ 49.35 I
245 Backhoe (w/o Operator) HR 2.5 138.98 347.45
Pickup HR 2.5 6.76 16.90
Foreman HR 2.5 43.50 108.75
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Loader Operator HR 1.0 39.07 39.07
Backhoe Operator HR 2.5 39.68 99.20
Total Cost $660.72 I
A new lump sum bid item has been added to the contract documents for the
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water main potholing as detailed below. The lump sum unit price includes
all equipment and labor costs required for the completion of the work.
Bid Schedule B - Water Main I
ADD i
ORIGINAL QUANTITY AMOUNT II SEQ. NO.! UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT).
49/ Water Main LS $660.72 0.00 1.00 $660.72
II
Potholing
0 Net Contract Change Add $660.72 I
E. The Contractor has performed work on a time and materials basis to extend II the existing drain field for the Lake Susan Park pumphouse. The existing
drain field was located in the area of the proposed basketball court based
upon the new Lake Susan Park Development Plan. It was necessary to extend
the Drain Field as a result of the Lake Susan Park Grading. I
The equipment and labor time required for the completion of. the work is as
follows: I
ITEM UNIT QUANTITY UNIT PRICE AMOUNT
245 Backhoe HR 2.0 $138.98 $277.96 I
966 Loader HR 2.0 69.55 139.10
Compactor HR 1.0 32.46 32.46
Foreman HR 2.0 43.50 87.00
II
Backhoe Operator HR 2.0 39.68 79.36
Loader Operator HR 2.0 39.07 78.14
Pipelayer HR 2.0 33.85 67.70 II Bottomman HR 2.0 33.65 67.30
Oiler HR 2.0 30.35 60.70
Labor and Equipment Cost $889.72 I
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The additional materials required are described below:
11 ITEM UNIT QUANTITY UNIT PRICE AMOUNT
6" PVC SDR 35 LF 70.0 $ 1.92 $134.40
I 6" PVC Perf. LF 10.0 2.73 27.30
Filter Fabric SY 3.0 1.23 3.69
6" PVC Bend EA 1.0 4.21 4.21
II3/4" Clean Rock Ton 8.4 8.03 67.45
Material Cost $237.05
IIThe additional work has resulted in a new lump sum bid item for the drain
field extension. The lump sum unit price includes all materials, labor and
equipment costs required for the completion of the work. The new bid item
IIis detailed as follows:
Bid Schedule C - Storm Sewer
IIADD
ORIGINAL QUANTITY AMOUNT
II SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
51/ Drain Field LS $1,126.77 0.00 1.00 $1,126.77
II Extension
Lake Susan Park
IIE. Net Contract Change Add $1,126.77
F. The Contractor has performed work on a time and materials basis to install a
II 18" reinforced concrete pipe culvert under the Lake Susan Park access road.
The culvert was installed in conjunction with the Lake Susan Park grading
work to provide drainage of the area north of the park.
IIThe equipment and labor time required for the completion of the work is as
follows:
IIITEM UNIT QUANTITY UNIT PRICE AMOUNT
245 Backhoe HR 3.0 $138.98 $ 416.94
II 966 Loader HR 3.0 69.55 208.65
Compactor HR 3.0 32.46 97.38
Foreman HR 3.0 43.50 130.50
II Backhoe Operator HR 3.0 39.68 119.04
Loader Operator HR 3.0 39.07 117.21
Pipelayer HR 3.0 33.85 101.55
Bottomman HR 3.0 33.65 100.95
IIOiler HR 3.0 30.35 91.05
Labor and Equipment Cost $1,383.27
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The additional materials required are described below:
ITEM UNIT QUANTITY UNIT PRICE AMOUNT
18" RCP Apron EA 2.0 $466.40 $ 932.80
II
w/Trash Guard
18" RCP LF 72.0 13.46 969.12
Tied 3 Joints EA 3.0 7.86 _. 23.58 II Riprap Ton 2.0 21.70 43.40
Material Cost $1,968.90
The additional work has resulted in a new lump sum bid item for the II
installation of the culvert. The lump sum unit price includes all
materials, labor, and equipment costs required for the completion of the II work. The new bid item is detailed as follows:
Bid Schedule C - Storm Sewer
ADD II
ORIGINAL QUANTITY AMOUNT
SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
II
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
52/ Lake Susan LS $3,352.17 0.00 1.00 $3,352.17 II Park Culvert
F. Net Contract Change Add $3,352.17
II
G. The Contractor has removed significant areas of old bituminous that were not
contemplated in the original plans. These areas include: I
#1 County Road 17
#2 Lutheran Church Driveway
#3 TH 5 1
The contract does not specify unit prices for bituminous removal. The bitu-
minous was also significantly varying thicknesses. I
New unit prices have been established to compensate the Contractor for this
work.
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Bid Schedule D - Roadway
11 ADD
ORIGINAL QUANTITY AMOUNT
I SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
UNIT
Mn/DOT NO. ITEM PRICE QUANTITY (DECREASE) (DEDUCT)
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58/ Bituminous Removal SqYd $4.50 0.00 350.00 $1,575.00
I (County 17 - 4"-6")
59/ Bituminous Removal SqYd 5.50 0.00 528.00 2,904.00
1 (TH 5 6"-8")
60 Bituminous Removal SqYd 2.00 0.00 489.00 978.00
' (Church 2"-3")
C?, Net Contract Change ADD $5,457.00
IIH. The Contractor furnished and installed valley gutter and 7" concrete dri-
veway pavement through the driveways for adjacent businesses. New valley
Igutter and pavement were for:
#1 Empack Company - 2
II #2 Rosemount Company - 2
#3 Lake Susan Park Entrance - 1
New bid items are necessary for this work. They have been established as
Ifollows:
Bid Schedule D - Roadway
II ADD
ORIGINAL QUANTITY AMOUNT
I SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
61 7H Valley Gutter ' SF $3.50 0.00 1,655.00 $5,827.50
r62 7" Driveway SF 2.80 0.00 396.00 1,108.80
Pavement
I 14, Net Contract Change ADD $6,936.30
II I. The Contractor has performed bituminous patching work in several areas at
the request of the Engineer. These areas include:
1 #1 County Road 17
#2 Lutheran Church Parking Lot
#3 Market Boulevard
IA new bituminous patching bid item is necessary for payment of this work.
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Bid Schedule D - Roadway
ADD
ORIGINAL QUANTITY AMOUNT
SEQ. NO./ UNIT CONTRACT INCREASE/ ADD/
II
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) DEDUCT
63 Bituminous Patching Ton $ 69.00 0.00 50.OQ.._ $3,450.00 I
1, Net Contract Change ADD $3,450.00
II
J. The Contractor has installed two temporary street lights, one each for
Surcharge Area A and Surcharge Area B in order to provide temporary lighting
on those surcharge areas during the winter shutdown period. The Surcharge
II
Area B light will be removed and replaced by a permanent fixutre in conjunc-
tion with the surcharge removal in 1990. The Surcharge Area A light will
remain in place until such time that Surcharge area A is removed. I
A new bid item has been established to compensate the Contractor for this tem-
porary lighting as follows:
Bid Schedule F - Electrical II
ADD
II
ORIGINAL QUANTITY AMOUNT
SEQ. NO./ UNIT CONTRACT INCREASE ADD/
Mn/DOT NO. ITEM UNIT PRICE QUANTITY (DECREASE) (DEDUCT)
I
8 Temporary Street EA $2,855.45 0.00 2.00 $5,710.90
Light
.i, Net Contract Change ADD $5,710.90 II
SUMMARY I
Current Contract Amount $2,294,150.84
Item A Net Add $35,56715
II
Item B Net Deduct ($56,340.00)
Item C Net Deduct ($938.88)
Item D Net Add $ 660.72 1
Item E Net Add $1,126.77
Item F Net Add $3,352.17
Item G Net Add $5,457.00 II Item H Net Add $6,936.30
Item I Net Add $3,450.00
Item J Net Add $5,710.90
Contract Amendment No. 2 Net Add 4,982.23 1
Amended Contract Amount $2,299,133.07 ` '''
No changes to the Construction Schedule for the project shall be made due to the II
modifications which are included as a part of this Contract Amendment.
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APPROVALS:
RECOMMENDED BY: BRW, Inc.
By: �' , Title: Project Manager Date:
ACCEPTED BY: orthdale Con r tion Company, Inc.
By: Title: G.Nt. Date: 3 ••S—=gd
' APROVED BY: City of Chanhassen
By: Title: Date:
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