Agenda - Council - 11/09/2010 - Laserfiche WebLink

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GO VI Serif CASE # 5, Olo CONSIDER AWARD OF CONTRACT FOR A CULVERT REPLACEMENT UNDER 176TH LANE NW By: Tim Himmer, City Engineer Background: Staff has noticed that a section of the roadway along 176th Lane NW, between Okapi and Marmoset Streets, has been continually eroding over time causing potholes in the street. Upon further investigation it was discovered that the culvert under that roadway, which serves as the drainage way for County Ditch #51, has deteriorated and is showing signs of failure. The roadway subgrade from above is falling through holes in the culvert causing roadway failures. If this problem were to continue without being addressed it could lead to a catastrophic failure. Staff has solicited quotes from 3 contractors to perform a culvert replacement project, which work would entail: • Mobilization, traffic control, and erosion control • Ditch by-pass construction and dewatering • Removal and replacement of a 42" culvert • Muck excavation • Installation of flared end sections and rip -rap placement for armoring • Removal and reinstallation of the bituminous roadway It is anticipated that this work can be completed in approximately 10 days. It is ideal to perform this type of work late in the season when the flows within the ditch are at their lowest and impacts to the surrounding area can be minimized. Depending on the weather the final paving of the project may extend into next spring, but the roadway will be brought to grade and made passable with class 5 in the interim (if necessary). Funding: The low bidder is Dryden Excavating, Inc. in the amount of $44,365. The funding of this project will come from the Storm Water Utility Fund. Recommendation: Staff recommends that the City Council award a contract to Dryden Excavating, Inc. for the culvert replacement under 176th Lane NW in the amount of $44,365. Attachments: Location map Reviewed By: Finance Director Public Works Director City Administrator CC: 11/9/10