AgdaPkt 2013-06-03 Closed and Joint

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6.2.A. - Page 1 RE PO RT To the Honorable Mayor and City Council From the Cit Mana er June 3, 2013 SUBJECT Final Acceptance — Redwood Shores Lagoon Maintenance Boat Ramp RECOMMENDATION By motion, accept the Redwood Shores Lagoon Maintenance Boat Ramp Project, authorize the release of bonds and retention according to city procedures, and authorize the City Manager to increase the contract amount by 16.5% for a total amount of $321,258.40. BACKGROUND On October 8, 2012, Council awarded the construction contract for the Redwood Shores Lagoon Maintenance Boat Ramp Project to Applied Water Resources Corporation of Walnut Creek, California. The project consisted of constructing a permanent boat ramp to enable city staff and contractor better maintenance access to the lagoon on the east side of Shell Parkway. Construction started on January 2013 and achieved final completion on April 2013. Final walkthrough was conducted with PWS staff and punch list items were completed by the end of April 2013. ANALYSIS The contract was awarded for a base bid of $275,670.00. The project was successfully completed in accordance with the plans and specifications. Change orders were issued totaling $45,588.40. The final contract amount is $321,258.40 which is 16.54% higher than the initially awarded contract amount. The Council action on October 8, 2012 included an authorization for City Manager to increase the contract amount up to 10% of the amount awarded. Staff is seeking an additional 6.54% to supplement the cost of change orders. During construction, unforeseen conditions related to the quantity of silt was encountered which resulted in extra excavation and disposal of material. This resulted in additional quantities of base rock and rip rap required to cover the excavated silt area in order to create a solid foundation for the ramp and surrounding area. The other quantity adjustment was for the extra cubic yards of structural concrete required to construct the retaining walls and driveway. Contractor provided proof of tags for the materials to City's staff for information and review.