HomeMy WebLinkAbout07-10-2012 C5 WalterRECEIVED
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July 10, 2012
TO: City Council AGENDA
CORRESPONDENCE
FROM: Jay Walter, Public Works Director Date ' Item# C—
VIA: Katie Lichtig, City Manager
SUBJECT: Mid Higuera Rehabilitation – Additional Information regarding Alternatives
On July 8, 2012, Council Member Carter requested additional information associated with
Additive Alternates 2 and 3, bid as part of the Mid - Higuera Rehabilitation project and identified
in the Council Agenda Report, Alternative 2 of the Council Agenda Report provides the Council
with an option to include Additive Alternate 2 and /or Additive Alternate 3 in the construction
contract for the Mid Higuera Rehabilitation project.
Additive Alternate 2 includes the installation of pavement reinforcing grid within the structural
section of the new asphalt concrete (AC) pavement at a cost of $157,000. Pavement reinforcing
grid has been found to be effective in preventing cracking and prolonging the service life of AC
pavement when it is placed over an existing section of Portland cement concrete (PCC)
pavement particularly when the thickness of the AC section is less than two inches.
Higuera Street from Marsh Street to South Street does not show the typical, repeating reflective
cracking seen in AC over PCC streets in the downtown area. This is likely due to the fact that
although there is an underlying PCC street in this area, it carries a significantly thick AC overlay.
The use of grid in this location would provide an extension of service life of about five to ten
years. Based on the bids received, including the grid installation in the project would cost an
additional $157,000 and result in an increased cost of 78 %, for a 50% increase in service life,
assuming a 10 year increased service life.
Additive Alternative 3 includes the installation of a PCC cross gutter along an existing drainage
swale at the Higuera / Pacific / Walker intersection. PCC is extremely durable to repeated
drainage flows as compared to AC. Although staff believes that the additional cost of $12,106 to
include the PCC cross gutter in this project would result in a long - lasting cross gutter, the past
performance of the existing AC swale in this location shows that the swale has lasted about as
long as the adjacent AC street. Due to the limitations in the available funds, staff cannot justify
the use of General Fund Reserves necessary to fund this component of the project.
G:\Staff-Reports-Agendas-Minutes\—CCMemos\2012\Mid Higuera RehabilitationlEvaluation of Project Additive Alte mates.docx
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