HomeMy WebLinkAbout05-01-2018 Item 11 Southwood and Ellen Way Drainage Improvement
Meeting Date: 5/1/2018
FROM: Daryl Grigsby, Director of Public Works
Prepared By: Lyle Nemeth, Engineer II
SUBJECT: SOUTHWOOD AND ELLEN WAY DRAINAGE IMPROVEMENT,
SPECIFICATION NO. 91623
RECOMMENDATION
1. Approve plans and specifications for the Southwood and Ellen Way Drainage Improvement
Project, Specification No. 91623; and,
2. Authorize staff to advertise for bids; and,
3. Authorize the City Manager to award the contract if the lowest responsible bid is within the
Engineer’s Estimate of $207,000.
DISCUSSION
Background
A large portion of the City’s storm sewer pipeline infrastructure is comprised of corrugated metal
pipe (CMP). In the 1960’s and 1970’s, CMP was the industry standard due to its inexpensive
material cost, ease of installation and projected 50-year design life. In the City’s experience, CMP
has proven to have a life of 20 to 30 years. CMP typically fails by friction from the action of
flowing water with rocks and sediment, 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 address failing CMP drain systems at two locations: Southwood Drive
and Ellen Way. The drain system on Southwood Drive is adjacent to the following properties:
1404 – 1220 Southwood Drive and 1370 Woodside Drive. The drain system on Ellen Way is
adjacent to 546 and 547 Ellen Way. The proposed project will rehabilitate and extend the
existing storm drain systems by removing 150 linear feet of CMP and installing 350 linear feet of
polyvinyl chloride (PVC) pipe or High Density Polyethylene (HDPE) pipe liner. The existing
CMP systems being replaced have been identified by City staff as being at the end of their useful
life. The project will upgrade four catch basins to the current City-standard. In addition, one new
catch basin and three new manholes will be installed.
ENVIRONMENTAL REVIEW
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.
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FISCAL IMPACT
Project funding was adopted in the 2017-2019 Financial Plan as part of the Master CMP
Replacement account. There is currently $944,972 in the Master CMP Replacement account to
support this request for $252,000. At the time of contract award, a Budget Amendment Request
will be generated to transfer funding from the Master CMP Replacement account to the
Southwood and Ellen Way Drainage Improvement project’s account for construction.
This project will be 100% funded through Measure G, the half-cent sales tax measure approved
by the City’s residents.
ALTERNATIVE
Deny authorization to advertise the project. Staff does not recommend this alternative as the
condition of the pipe puts adjacent infrastructure at risk of failure.
Attachments:
a - Vicinity Map
b - Council Reading File - 91623 Plans - 100%
c - Council Reading File - 91623 Special Provisions - 100%
STREET & FLOOD CAPITAL BUDGET
Master CMP Replacement (90742)$944,972
Southwood and Ellen Way Drainage Improvement (91623)
Construction:$207,000
Construction Contingencies:$40,000
Material Testing:$4,000
Printing:$1,000
Total Cost of Project $252,000
Remaining Balance in Master Account $692,972
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