HomeMy WebLinkAbout06-02-2015 C10 MicrosurfacingCity of San Luis Obispo, Council Agenda Report, Meeting Date, Item Number
FROM: Daryl R. Grigsby, Director of Public Works
Prepared By: Gerardo Carrillo, Engineer II
SUBJECT: MICROSURFACING 2015, SPECIFICATION NO. 91309
RECOMMENDATION
1. Approve plans and specifications for the Microsurfacing 2015 Project, Spec No. 91309.
2. Authorize staff to advertise for bids and authorize the City Manager to award the contract if
the lowest responsible bid is within the Engineer’s Estimate of $882,000.
DISCUSSION
Background
The City’s Pavement Maintenance Plan (Pavement Plan) was adopted by the City Council on
April 14, 1998. The Pavement Plan was subsequently updated in 2009 to provide additional
emphasis on arterial street maintenance. The key element of the Pavement Plan is the
establishment of a rotating and methodical approach to ensuring all areas of the City receive
regular preventative or corrective maintenance. Most recent practice is to perform maintenance
in two neighborhood Pavement Areas one year, then focus on critical arterial street work the
following year, alternating between neighborhood areas and arterials each year. This provided
some cost savings in bid prices on the last neighborhood project, due to the larger quantities.
California Blvd was completed in 2013, and Areas 6 and 7 were completed last year (Attachment
1).
The 2015 Microsurfacing Project includes Microsurfacing of Johnson Avenue and Osos Street
(Attachment 2). Microsurfacing is a mixture of polymer modified emulsion, graded aggregates,
mineral filler, water and additives. Instead of breaking and curing via evaporation, like a
traditional slurry seal, a chemical reaction causes the material to cure. The quality of the
microsurfacing is dependent on the quality of the raw materials. For this reason, a minimal
amount of potable water will need to be used to supplement the water lost during the emulsion
heating process. However, staff is investigating the use of recycled water as a supplement and
will require the contractor to use this source if it meets the raw material requirements.
Completion of the 2015 Microsurfacing Project will enable the City to make progress towards
the Council’s established goal to maintain at least 70% of streets in good condition and have no
less than 7% of the City’s streets in bad condition.
In anticipation of this year’s roadway sealing project, the City’s Street Maintenance staff has
performed crack sealing on the streets included within the project scope. This preparatory work
will increase the long-term effectiveness of the seal application and reduce construction costs.
Also included with this project is the upgrade of existing street corner ramps along Osos Street to
improve access. Federal ADA standards require ramp upgrades since street surface
rehabilitation, including microsurfacing, is considered an alteration and therefore subject to the
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ADA’s requirements. The project also includes isolated pavement repairs in failed areas, curb
and gutter repairs, maintenance of existing bicycle facilities, and new pavement stripes and
markings to alert drivers of the need to share the road with cyclists.
CONCURRENCES
This project is categorically exempt from environmental review pursuant to section 15301 of the
CEQA Guidelines (Existing Facilities) since it is a maintenance and replacement project. A
Notice of Exemption has been filed through the Community Development Department.
FISCAL IMPACT
There is currently a balance of $290,190 in the Construction Phase of the Street Reconstruction
and Resurfacing Master Account (90346). Additional construction funding of $1,436,817 is
proposed in the 2015-17 Financial Plan Capital Request to augment the Master Account and
provide adequate funding for the annual pavement project. If the budget is approved as proposed,
the additional funding will be available July 1, 2015, bringing the total funding available balance
to $1,727,007 for Construction. The 2015 Microsurfacing project will be awarded after final
adoption of the 2015-17 Financial Plan. If the funding is not approved, staff will recommend
rejection of bids and staff will reduce the project to remain within the current available funding
balance.
This project is 100% funded through the one-half percent sales tax measure approved by the
City’s residents.
Estimated Project Cost
Microsurfacing 2015 Project (91309)
Construction Estimate: $881,480
Contingencies: $132,222
Material Testing: $4,500
Printing: $500
Total Project Cost $1,018,702
ATTACHMENTS
1. Pavement Area Map
2. Project Vicinity Map
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
Plans and Special Provisions
t:\council agenda reports\2015\2015-06-02\microsurfacing 2015\91309 council agenda report.docx
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ATTACHMENT 1
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