HomeMy WebLinkAbout01/04/2011, C4 - MONTEREY STORM DRAIN REPLACEMENT, A MEASURE Y-1/2 CENT SALES TAX FUNDED PROJECT, SPECIFICATION NO. council"` 4-2011
acEnaa REpoRt
CITY OF SAN LUIS OBISPO
FROM: Jay D. Walter, Director of Public Works IE
Prepared By: Manny Guzman, Engineer II
SUBJECT: MONTEREY STORM DRAIN REPLACEMENT,A MEASURE Y—
1/2 CENT SALES TAX FUNDED PROJECT,SPECIFICATION NO. 91036
RECOMMENDATIONS
1. Approve plans and specifications for the Monterey Storm Drain Replacement Project, a
Measure Y- '/s cent sales tax funded project, Specification No. 91036.
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$350,000.
DISCUSSION
A large portion of the City's storm sewer pipeline infrastructure is comprised of corrugated metal
pipe (CMP). In the 1970s and 1980s CMP was the industry standard due to its inexpensive material
cost and ease of installation. Since then, CMP has proven to have a design life of 20 to 30 years.
CMP typically fails by friction, corrosion or both. Once the integrity of the pipe has been
compromised, the pipe's surrounding soil becomes susceptible to piping (soil picked up by flowing
water and carried away) and the pipe will eventually collapse.
The proposed project will remove CMP at various locations on Monterey Street from Toro to
California. The CMP will be replaced with either polyvinyl chloride(PVC) pipe or High Density
Polyethylene (HDPE) pipe. The existing CMP being replaced has been identified by City staff as
being at the end of its useful life. Also included in this project is the replacement of storm drain
grates located within the project's work limits. Six grates were identified as roadway obstacles
for the bicycle community because the open grid of the grate can catch a narrow bicycle tire.These
grates will be replaced with more bicycle-friendly grates to prevent this from occurring.
Thirteen catch basins will also be replaced with current City-standard catch basins. Existing catch
basin are typically top opening structures with metal grates that tend to clog or are undersized for
the current water runoff. The new catch basins are sized appropriately for the current drainage
requirements and are side-opening structures that are more free-flowing and easier to negotiate for
bicycles and pedestrians.
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Monterey SD Replacement Spec. No. 91036 Page 2
CONCURRENCES
This project is exempt from environmental review and a Notice of Exemption has been filed
through the Community Development Department.
FISCAL IMPACT
There is currently $666,668 in the Master CMP Replacement account to support this request for
$350,000. At the time of contract award, a Budget Amendment Request will be generated to
transfer funding from the Master CMP Replacement account to the Monterey Storm Drain
Replacement project's account for construction.
This project will be 100% funded through Measure Y, the half-cent sales tax measure approved
by the City's residents.
Master CMP Replacement (90742) $666,6681
,Monterey SD Replacement(91036):__ __—f-- _
1 _ Constructional $_350000i
Construction Contingencies: $35,00011
Material Testing: $3,000
- Printing:! $1,000!
,Total Cost of Project _ _ — $3§%Q90j
Remaining Balance in Master Accounti- - $277,6681
ALTERNATIVE
The Council could opt not to construct this project. Staff does not recommend this alternative as
the condition of the pipe puts adjacent infrastructure at risk of failure.
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
Plans and Specifications
7 .
T:\Council Agenda Reports\Public Works CAR\2010\CIP\91036 Monterey SD Replacement\91036 CAR Advertise.doc
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