Adopt Resolution #20-165 Approving Change Order #1 for Variolite Street Reconstruction, Improvement Project 20-01.
 

Purpose:
The purpose of this case is to adopt Resolution #20-165 approving Change Order #1 for Variolite Street Reconstruction, Improvement Project 20-01.
 
Background:
Included in the Variolite Street Reconstruction project is the replacement of existing 10” force main trunk sanitary sewer with 21” PVC gravity trunk sanitary sewer along Variolite Street between 163^rd Avenue and 166^th Avenue, a distance of approximately 2,360 feet.
 
The new trunk sanitary sewer is proposed to allow for future expansion of the sanitary sewer system to the north. After staking the proposed end of line stub, City Staff found that installing the sanitary sewer stub as proposed would impact existing trees, landscaping and existing high pressure gas mains, and that future connections made to the sanitary sewer stub would require several hundred feet of Variolite Street to be reconstructed. To avoid such existing and future impacts, this change order proposes to extend the 21” PVC sanitary sewer 160 lineal feet and to add an additional manhole to the north. The sanitary sewer stub out of the last manhole is directed into the east ditch, beyond the tree impact area, far enough off Variolite Street to avoid future impacts to the street and existing gas mains, which would cost significantly more than extending the sanitary sewer 160 feet to the north.

In addition, after award of the contract, City Staff was contacted by the residents at 7600 163^rd Lane with an inquiry to connect to city sewer and water. This change order includes the necessary work to extend 1” water service and 4” sanitary sewer service lines to the right of way at 7600 163^rd Lane NW, which the property owner can then connect to.

Park Construction plans to begin installing sanitary sewer on Wednesday, August 12, 2020. The work required to provide City utility service lines for 7600 163rd Lane NW are near the beginning point of sanitary sewer construction, therefore approval of Change Order #1 must occur before August 12th in order to ensure that Council approval is received before work associated with Change Order #1 begins. Whenever possible, Staff requests Council approval of Change Orders prior to authorizing any  associated work.

A petition and waiver agreement for the connection to City sewer and water services is considered under a separate case on the consent agenda.

No notifications are required.

Observations:
If the improvements proposed under Change Order #1 had been contemplated earlier and included in the plans, the bid prices would have reflected a commensurate increase in construction costs.
 
Alternatives:
Alternative #1 – Motion to adopt Resolution #20-165 approving Change Order #1 for Variolite Street Reconstruction, Improvement Project 20-01.
 

Payment for the work covered by Change Order #1 will be funded partly by sewer and water funds, and partly by the property owner of 7600 163rd Lane NW in an amount up to $14,409 as outlined under the separate consent agenda case requesting Council approval of a petition and waiver agreement allowing these costs to be assessed against this property.
 

City Staff recommends Alternative #1.

Motion to adopt Resolution #20-165 Approving Change Order #1 for Variolite Street Reconstruction, Improvement Project 20-01.