MEMO TO: Members of the City Council
FROM: Mayor John Marchione
SUBJECT:
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Award of Bid to NW Relining LLC, in the Amount of $319,640.10 for Relining of Stormwater Pipes, 152nd Ave Westpark and 90th St, Project No. 20021603
I. RECOMMENDED ACTION
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Approve the award of bid for the 152nd Ave Westpark and 90th St storm water project, Project No. 20021603 to NW Relining LLC of Olympia, Washington in the amount bid of $319,640.10 and authorize the Mayor to execute the contract
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II. DEPARTMENT CONTACTS
Martin Pastucha, Director of Public Works 425-556-2733
Mike Paul, City Engineer 425-556-2733
Joseph O'Leary, Project Manager 425-556-2738
III. DESCRIPTION/BACKGROUND
The stormwater lines in the right of way of 152nd Ave adjacent to Westpark Business Park are in a state of disrepair. City maintenance crews have identified these pipes for replacement based on pipe inspection video recordings. The existing corrugated metal pipes are heavily corroded and large tree roots have entered the pipes at various locations, obstructing water flow during storm events. After evaluating options for replacing the pipe, it was determined that least expensive and less obtrusive construction approach is to slip line the existing pipe with new pipe.
On NE 90th Street, east of 160th Ave NE, there is a large existing perforated stormwater infiltration pipe. The large pipe was designed and installed with perforations prior to the existence of the wellhead protection zone. This pipe was found to be good candidate for slip lining to ensure the integrity of the pipe. When slip-lined, the pipe will no longer infiltrate untreated stormwater into the wellhead protection zone. This will also extend the service life of the pipe which is needed to provide stormwater conveyance.
Bid Results
The project was advertised in the Daily Journal of Commerce on June 28, 2018. The City Clerk received bids until July 12, 2018. There were four (4) bidd...
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