Garfield Avenue Retaining Wall Repair at 1695THE CITY OF DUbUgU@
DT '~~ ~ All-AmericaCitY
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Masterpiece on the Mississippi
d
2007
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: 1695 Garfield Avenue Retaining Wall Repair Project
CIP 1002087
DATE: December 1, 2009
City Engineer Gus Psihoyos is recommending acceptance of the construction contract
for the 1695 Garfield Avenue Retaining Wall Repair Project, as completed by Top
Grade Excavating, Inc., in the final contract amount of $87,601.19, which is an 80.2%
increase from the original contract amount of $48,603.49. The original engineer's
estimate for this project was $95,000.
The increase from the contract amount was due to the discovery that the foundation of
the existing home at 1695 Garfield Avenue below grade level consisted of concrete
cinder blocks sitting on a sand soil, instead of what was originally assumed to be a
poured concrete foundation. Due to the discovery, there was great concern by
Engineering staff that excavating and removing the entire existing limestone retaining
wall would cause the house foundation to settle. After reviewing various options, it was
determined that the most cost-effective solution was to construct a completely new
reinforced concrete wall on the outside the existing limestone wall. The new concrete
wall was constructed with concrete form liners and integral colored concrete to simulate
a limestone wall. The house foundation was sealed with a waterproofing agent to
prevent any possible water seepage as a result of the construction of the retaining wall.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
ichael C. Van Milligen
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
THE CITY OF DU b U q Ue
DT T~ ~ All-AmericaC~y
~J ' ~
Masterpiece on the Mississippi
2007
TO: Michael C. Van Milligen, City Manager
FROM: Gus Psihoyos, City Engineer
DATE: November 25, 2009
SUBJECT: 1695 Garfield Avenue Retaining Wall Repair Project
CIP 1002087
INTRODUCTION
The enclosed resolution provides for the acceptance of the construction contract for the
1695 Garfield Avenue Retaining Wall Repair Project.
BACKGROUND
The 1695 Garfield Avenue Retaining Wall Repair Project provided for the reconstruction
of a 10-foot high limestone retaining wall. The project was designed by IIW Engineers
and Surveyors to utilize the salvaged stone from the existing wall and included new
geofoam and clean stone backfill along with new limestone where needed. All turf areas
and sidewalk that were disturbed during the project were replaced. Also the existing
roof drains of the abutting home were tied into the foundation drain of the wall.
DISCUSSION
The 1695 Garfield Avenue Retaining Wall Repair Project was completed by Top Grade
Excavating, Inc. of Epworth, Iowa, in the final contract amount of $87,601.19, which is
an 80.2% increase from the original contract amount of $48,603.49. The original
engineer's estimate for this project was $95,000.
During the de-construction of the existing limestone wall, it was discovered that the
foundation of the existing home at 1695 Garfield Avenue consisted of concrete cinder
blocks sitting on a sand soil. During the design of the retaining wall, it was assumed that
the house foundation was a poured concrete foundation since a concrete foundation
was exposed from the exterior of the home. Engineering and IIW staff also investigated
the interior of the home prior to construction to determine the condition of the
foundation. The interior of the basement is finished off with paneling and therefore staff
were unable to determine the condition of the foundation. Since the foundation was
discovered to be concrete cinder blocks below the existing grade and that they were
sitting on sand, there was great concern by Engineering staff that excavating and
removing the entire existing limestone retaining wall would cause the house foundation
to settle.
RESOLUTION NO. 448-09
ACCEPTING THE 1695 GARFIELD AVENUE RETAINING WALL REPAIR PROJECT
AND AUTHORIZING THE PAYMENT OF THE CONTRACT AMOUNT TO THE
CONTRACTOR
Whereas, the Public Improvement Contract for the 1695 Garfield Avenue
Retaining Wall Repair Project (the Project) has been completed and the City Engineer
has examined the work and filed a certificate stating that the Project has been
completed according to the terms of the Public Improvement Contract and that the City
Engineer recommends that the Project be accepted; and
NOW THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY
OF DUBUQUE, IOWA:
Section 1. The recommendation of the City Engineer is approved and the Project
is hereby accepted.
Section 2. The Finance Director is hereby directed to pay to the Contractor from
the Garfield Wall appropriations for the contract amount of $87,601.19 less any retained
percentage provided for therein as provided in Iowa Code chapter 573, and to pay such
retainage only in accordance with the provisions of Iowa Code chapter 573.
Passed, approved and adopted this nth day of Decembe
UC
Roy D. Buol, Mayor
At st:
~~
eanne F. Schneider, CMC, City Clerk
CITY ENGINEER'S CERTIFICATE OF FINAL COMPLETION OF THE 1695
GARFIELD AVENUE RETAINING WALL REPAIR PROJECT
The undersigned City Engineer of the City of Dubuque, Iowa, hereby certifies that
he has inspected the 1695 Garfield Avenue Retaining Wall Repair Project, that the
Project has been performed in compliance with the terms of the Public Improvement
Contract, and that the total cost of the completed work is $104,423.16.
Dated thi~2~ day ofr,~~Cpl~~iL , 2009.
City Engineer
Filed in the office of the City Clerk on the~~~' day of , 2009.
anne F. Schneider, CMC, City Clerk
THE CITY OF
DUB E
Masterpiece on the Mississippi
PARTIAL PAYMENT NO: COUNCIL FINAL
PROJECT NAME: 1695 Garfield Avenue Retaining Wall Repair
DATE: November 13, 2009
CONTRACTOR: Top Grade Excavating, Inc. CONTRACT AMOUNT: 548,803.49
BID ITEM DESCRIPTION UNIT UN T OST (TO DATE AMO O DATENED
RETAINING WALL REPAIR
1 Mobilization 8 Miscellaneous LS $4,000.00 1.00 $ 4,000.00
2 Waterproofing LS $1,830.00 1.00 $ 1,830.00
3 Traffic Control LS $950.00 1.00 $ 950.00
4 Structural Removal LS $7,000.00 1.00 $ 7,000.00
5 Excavation, Unclassified CY $35.61 337.00 $ 12,000.57
6 Engineered Fill TON $13.26 0.00 $ -
7 Geofoam Fill -Install Only CY $24.86 30.26 $ 752.26
8 Topsoil CY $42.59 70.00 $ 2,981.30
9 Engineered Fabric SY $4.10 170.00 $ 697.00
10 4" PCC Sidewalk SF $4.24 555.00 $ 2,353.20
11 4" Perforated CPE Drain Tile LF $31.44 0.00 $
12 4"CPE Riser LF $34.63 0.00 $
13 Drain Outlet EA $200.00 2.00 $ 400.00
14 Limestone (Salvaged) SF $2.38 0.00 $
15 Limestone (New) SF $33.33 0.00 $ -
16 Chain Link Fence LF $20.33 135.25 $ 2,749.63
17 Drainage Material TON $18.81 90.23 $ 1,697.23
18 Seed, Fertilizer and Mulch SY $2.00 175.00 $ 350.00
TOTAL AMOUNT EARNED TO DATE: $ 37 761.19
CHANGE ORDER -EXTRA WORK ITEMS
C1 PC. Concrete Wall, 8" Thick, integral color w/Foam liners CY
C2 Concrete Backfill CY
C3 Concrete Footing CY
C4 P.C. Concrete Curb 8 Gutter, 2.5' LS
C5 P.C. Concrete Handicap Ramp LS
C6 4" Perforated CPE Drain Tile LF
C7 4"CPE Riser LF
City of Dubuque -Engineering Division
Council Final Payment Form
$725.00 47.50 $ 34,437.50
$200.00 16.50 $ 3,300.00
$375.00 25.50 $ 9,562.50
$500.00 1.00 $ 500.00
$200.00 1.00 $ 200.00
$10.00 134.00 $ 1,340.00
$10.00 50.00 $ 500.00
TOTAL AMOUNT EARNED TO DATE -CHANGE ORDERS: $ 49 840.00
TOTAL AMOUNT EARNED TO DATE: E 87 801.19
TOTAL DUE CONTRACTOR: S 87 801.19
ENGINEERING: S 12 223.22
TOTAL CONSTRUCTION COST: E 99 824.41
CERTIFICATE OF THE CITY MANAGER:
I hereby certify that the above statement shows in detail the correct amount o I work required to complete the above improvement.
APPROVED:
Michael Van Mi ' en, City Manag
City of D Iowa
APPROVED:
Gus Psihoyos, City Engineer
City of Dubuque, Iowa
TE OF THE CONTRACTOR
The undersigned, Top Grade Excavating, Inc. contractor for the above improvement, does
hereby accept the above "Total Due Contractor", as full seitle/m'ent for all claims for said improvement.
CONTRACTOR: ~F~ GR~I1 KC
BY:
TITLE:
DATE: I ~ ~' ~ r~
City Engineering staff, IIW staff and the contractor reviewed various options to stabilize
the foundation. A national geotechnical engineering company was also contacted for
remediation strategies on how to stabilize the soil around the foundation. It was
determined that the most cost-effective solution was to construct a completely new
reinforced concrete wall on the outside of the existing limestone wall. The new concrete
wall was constructed with concrete form liners and integral colored concrete to simulate
a limestone wall. The house foundation was sealed with a waterproofing agent to
prevent any possible water seepage as a result of the reconstruction of the retaining
wall. A picture of the partial deconstruction of the old wall and a picture of the new wall
are attached with this memo.
RECOMMENDATION
recommend that the City Council accept the improvements and authorize payment of
the contract amount of $87,601.19 to Top Grade Excavating, Inc. of Epworth, Iowa, for
the 1695 Garfield Avenue Retaining Wall Repair Project.
PROJECT COST -BUDGET IMPACT
The summary of costs for the 1695 Garfield Avenue Retaining Wall Repair is
summarized as follows:
Construction Contract
Contingency
Construction Engineering & Inspection
The project funding summary is as follows:
CIP Fund Description
1002087 Garfield Wall
ACTION TO BE TAKEN
Award Final
$48,603.49 $ 87,601.19
15,250.00 0
16,387.00 16,821.97
$79, 240.49 $104,423.16
Fund Amount
$104,423.16
I respectfully request that the City Council adopt the attached resolution accepting the
improvements and authorizing payment of the contract amount of $87,601.19 to Top
Grade Excavating, Inc. for the 1695 Garfield Avenue Retaining Wall Repair Project.
Prepared by Jon Dienst, PE
cc: Jenny Larson, Budget Director
Bob Schiesl, Assistant City Engineer
Rich Russell, Building Services Manager