The URL can be used to link to this page

Home My WebLink AboutCO 5 CAG-18-001 , CO #5-19 /G\1.Y 0 ( IhAt4-5) , \' k'"7'Cl ‘ Change Order No. 5 Contract Title: NE 31st St Bridge Replacement Project Contractor: Hamilton Construction Co. Contract No. : CAG 18-001 Federal Aid No. : BROS-1070(009) ® Ordered by Engineer ❑ Proposed by the Contractor(VECP) ❑ Unilateral Original Contract Amount: $1,255,999.00 Original Contract Working Days: 80 Current Contract Amount: $1,259,899.00 Current Contract Working Days: 90* Estimated Net Change This Order: $0.00 Added Working Days: 0 New Contract Amount: $1,259,899.00 Total Contract Working Days: 90 'Note:Minor Change No 1 added 2 Working Days,Minor.Change No.2 added 2 Working Days,Minor Change No.3 added 3 Working Days. Prepar By: Iss By: Olguk Resident Engfiee Date Engineer ' f Renton Transportation Date tr je 1 MM"icr Design Manager) Reviewed By: Consent By: Engineer of Record Date Surety(Greater than 25%cost and/or 20% Date time Increase) Reviewed By: Endorsed By: l�l�a-.-..149,11 f'/' . / / i2C4/>City of enton Project Manager Date Contractor &L.7 Tra••t. be;19n Executed By: �ivl Reviewed By: ,A4,744101 /1111-, i6 _ City Attorney(Greater than$35,00o Date Cit of R9fton Public'Works Dat and/or change In scope) Administrator/Mayor Change Order No. 5 _,. Contract Title: NE 31st St Bridge Replacement Project Contract No. CAG-18-001 Page 1 of 4 THE CONTRACT IS MODIFIED AS FOLLOWS: Description of Change: • Revise quantity for the following bid items in the contract: o Bid Item No. 32, GRAVEL BACKFILL FOR WALL, Revised Quantity= 22 C.Y. • Add the following bid items to the contract: o Bid Item No. 5-32, NATIVE BACKFILL FOR WALL, Quantity= 1 L.S., Unit Price = $1,840.00 per L.S. • Add Special Provision Section 6-02.3(22) Drainage of Substructure 6-02.3(22) Drainage of Substructure Delete this section and replaced it with the following: All backfill behind the abutments shall be gravel backfill for walls, unless the Engineer determines that native backfill is suitable for this use. • Add Special Provision Section 6-02.5 Payment 6-02.5 Payment Section 6-02.5 is supplemented with the following: "Native Backfill for Wall", lump sum. The lump sum Contract payment shall be full compensation for all costs incurred by the Contractor for placement and compaction of Native backfill behind the abutments. Reason for Change: The abutments are comprised of reinforced concrete,founded on concrete piles. Each abutment is surrounded on three sides by steel sheet piling with a reinforced concrete cap.This sheet piling provides scour protection for the abutments. Each abutment includes a back wall creating an L-shape type of abutment.The superstructure consists of precast, pre-stressed,voided slab girders with a wear course of HMA.The HMA spans between sheet pile caps on each side of the roadway.Traditional approach slabs were not included in the design. However,a +2-ft thick layer of Controlled Density Fill (CDF)was placed behind the abutments, extending 10-ft beyond each end of the bridge into the roadway approaches. A 6-inch layer of Crushed Surfacing Base Course (CSBC)was placed on top of the CDF and HMA was placed on top of the CSBC.The vertical limits of Structural Excavation started at the base of the abutment and ended below the CDF layer. Change Order No. 5 Contract Title: NE 31st St Bridge Replacement Project Contract No. CAG-18-001 Page 2 of 4 The Schedule of Prices included Bid Item No. 32, Gravel Backfill for Wall, Quantity=45 C.Y. The roadway drains away from the bridge so there is not a significant source of surface water runoff that could infiltrate behind the abutments and increase lateral hydrostatic pressures.As a result,the design did not include weep holes or underdrains for the abutments or the sheet pile walls.The 2016 WSDOT Standard Specifications Section 6-02.3(22) Drainage of Substructure states "Unless the Plans require otherwise, all other backfill behind the wall or abutment shall be gravel backfill for walls."The native material on site consists of sand with some gravel and silt. Drawing No. 9 includes detail called "Excavation and Backfill limits,Typical Section at Abutment".This detail shows Gravel Backfill for Wall placed behind the abutments.The vertical limits at each abutment extends from the base of the abutment to the base of the CDF layer.The horizontal limits at each abutment extends 3-ft from the back face of the abutment. Drawing No. 11 includes Roadway Sections& Details.Typical Sections 3 and 4 show typical roadway sections at each end of the bridge where CDF was to be placed.The material shown under the CDF layer is defined as Native Material. The information shown on these two drawings results in a discrepancy for the type of material to be placed behind the abutments, underneath the CDF layer. Approximately,22 C.Y. of Gravel Backfill for Wall was imported to the project and placed behind the abutments. Progress Payment No.5 included payment for the imported quantity of Gravel Backfill for Wall. However,stockpiled native material was also placed behind the abutments.The contract did not include a bid item for the placement of native material. The use of native backfill was discussed in the field.The Engineer determined that the material was suitable for this use.The placement and compaction of backfill behind the abutments occurred on October 8, 2018. Materials: Native Backfill for Wall. Plans: No changes were made to the drawings. Adjustment: This Change Order includes changes as defined in Section 1-04.4. Specifically, altering specifications. Extension of Time: The Time for Completion is extended 0 non-compensable Working Days in accordance with Section 1-08.8. Change Order No. 5 Contract Title: NE 31st St Bridge Replacement Project Contract No. CAG-18-001 Page 3 of 4 Equitable Adjustment: This Change Order includes an equitable adjustment in the unit price of the new bid item. The unit price for the new bid item is as follows: • Bid Item No. 5-32, NATIVE BACKFILL FOR WALL, Unit Price = $1,840.00 per L.S. Sections 1-04.4 and 1-04.5 of the 2016 WSDOT/APWA Standard Specifications shall govern this Change Order.The Work of the referenced Contract is modified to include the changes detailed herein.The payment provided for herein shall constitute the complete and final settlement for all costs of labor, equipment, materials, overhead, profit, permit fees, and all other claims that may be made by the Contractor as a result of this change. Attachments: Forms to be attached to Change Order O Plans • Field Directive ❑ Change Order Quotation ® Estimated Change Order Cost El Project Labor List ❑ Force Account Equipment Rate Request (DOT Form 422-010 EF) O Equitable Adjustment Determination Change Order No. 5 Contract Title: NE 31st St Bridge Replacement Project Contract No. CAG-18-001 Page 4 of 4 Estimated Change Order Cost Change Order No. 5 Bid Item No. Description Quantity Unit Unit Price Estimated Cost Force Account Item description Labor Estimate $0.00 Labor Markup 29% $0.00 Equipment Estimate $0.00 Equipment Markup 21% $0.00 Materials Estimate $0.00 Materials Markup 21% $0.00 Services Estimate $0.00 Services Markup 21% $0.00 Mobilization Estimate $0.00 Subcontractor Work Estimate $0.00 Subcontractor Markup 12%,10%,7% $0.00 Bid Item Change 32 GRAVEL BACKFILL FOR WALL -23 L.F. $80.00 -$1,840.00 5-32 NATIVE BACKFILL FOR WALL 1 L.S. $1,840.00 $1,840.00 Equitable Adjustment Per attached determination Estimate $0.00 Calculated Cost $0.00 Estimated Change Order Cost $0.00 Page 1 of 1