HomeMy WebLinkAboutAgenda Report - August 6, 2008 E-06AGENDA ITEM P,40 to
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AGENDA TITLE: Approve Plans and Specifications and Authorize Advertisement for Bids for
School Street and Spruce Street Wastewater Pipe Improvement Project
MEETING DATE: August 6,2008
PREPARED BY: Public Works Director
RECOMMENDED ACTION: Approve the plans and specifications and authorize advertisementfor
bids for the School Street (Spruce Street to 350 Feet South of
Spruce Street) and Spruce Street (School Street to Alley East of
School Street) Wastewater Pipe Improvement project.
BACKGROUND INFORMATION: This project consists of trenching and installing approximately 535 linear
feet of eight -inch wastewater pipe, abandoning the existing wastewater
pipe, and other and incidental and related work, all as shown on the
plans and specifications for the project and as presented in ExhibitA.
The existing wastewater pipe in this section of School Street was video inspected in June 2008. The video
showed that the non -reinforced concrete pipe has extensive deterioration. The pipejoints have large offsets
and the pipe wall has a severe corrosion problem. The corrosion problem is so severe that there are sections of
the pipe missing.
Further investigation by staff has found two areas that contributeto the extensive corrosion problem in the
pipeline. First, this section of the wastewater pipe in School Street has a minor reverse slope. This means the
wastewater stays in the pipelinefor a long period of time during non -peak periods. Second, the wastewater pipe
in Spruce Street from the alley east of School Street to School Street was installed nine inches lower than the
downstream pipe in School Street. Again, the wastewater stays in the pipeline for an extended period of time
during non -peak periods. When wastewater is stagnant or slow -flowing (less than two feet per second),
hydrogen sulfide gas develops, leading to the deterioration of material containing cement (concrete pipe and
cemented joints).
Staff is recommending replacing these two sections of the wastewater pipe to correct the problems as soon as
possible. The existing wastewater pipe will be grouted and abandoned in place. The plans and specifications
are on file in the PublicWorks Department.
FISCAL IMPACT: The estimated project cost is $83,000. The projectwill result in less required
maintenance for this section of wastewater pipe.
FUNDING AVAILABLE: Funding for this project is included in the FY 08/09 Budget in the Wastewater
Replacement Fund (171).
Planned Bid Opening Date: August 27, 2008
F. Wally Wandelin
Public Works Director
Prepared by Lyman Chang, Senior Civil Engineer
Attachment
cc: Water Service Manager
Senior Civil Engineer Chang
APPROVED: I_Za�
BI&4, City Manager
K 1WPIPROJECTSISEWERIScYsoolStWastewaterPipelCPS&A doc 713012008
.••:-1DICITY OF LOPUBLIC WORKS DEPARTMENT
EXHIBIT A
School St & Spruce St
Wastewater Pipe Improvements/
R Projects\School St WW Replacement\CC_Exhibit A.dwg, Layout3, 07/17/2008 8:27:06 AM, Ichang