2016/11/30 Council Agenda Packet

Project: East Grand Ave Sewer System Replacement and Storm Water Separation Change Order No. 3 Change Order Effective Date:November 8,2016 JUSTIFICATION: Schedule B: Modified Bid Items: Bid Item B-14- Control Density Fill.The quantity of control density fill was not required nearly to the extent anticipated during the design and allowed for in the bid proposal. Bid Item B-58-Remove&Replace Generator Pad. This bid item is being deleted as a result of the added work at Lift Station#32. A portion of the work required under this bid item was done by City of Everett forces and the rest of the work was completed by KLB Construction forces. The revised work effort required by KLB Construction is being paid under new bid item B-69—Remove&Replace Generator Pad. New Items: Item B-66—Pervious Concrete. At the intersections of 21St,22nd,23rd and 24th Streets and East Grand Avenue,where curb bulb-outs were added to make space for the new Stormwater treatment units,pervious concrete is being used in these areas between the sidewalk and new curb. This is in lieu of topsoil and grass which would become a maintenance burden for the City or adjacent property owners.Pervious concrete is expected to require very little maintenance and is consistent with the objectives of this project which is to reduce storm water runoff in the sewer system. The cost for pervious concrete includes the removal of existing materials to a depth of 1 foot, and placement of 4- inches of pervious concrete over 8-inches of free draining gravel. Item B-67—Private Walkways and item B-68—Concrete Steps. Justification for these two items was necessary as the new curb and sidewalk grade elevations changed slightly along various areas of East Grand Avenue,requiring height adjustments to the private walkways that abut the new sidewalk grade. In certain instances new concrete steps were incorporated into these private walkways to aid in matching grade of new sidewalks. Item B-69—Remove&Replace Generator Pad. This bid item is being added as portion of the work required under original bid item#58 was completed by City of Everett forces,with the rest of the work completed by KLB Construction forces. The revised work effort required by KLB Construction is paid for under this new bid item. CONTRACT TIME: Twenty eight(28)working days are being added to the contract time by change order#3 as a result of structural modifications made to Lift Station#32 to raise the height of the existing wet well structure. The hatchways requested by the City's Technical Service Group,in the top concrete slab above the wet well of the lift station,had significant long lead procurement time frames,which resulted in the need to add these additional 28 working days. Page 4 of 4 223