From
Max
Title
Final Change Order No. 15 with Jackson Construction on Mayfield Road and the Airport Detention in the negative amount of ($111,457.78)
Presenter
Romin Khavari, City Engineer
Recommend Action
Approve
Analysis
On June 17, 2008, the City of Grand Prairie awarded a construction contract to Jackson Construction in the amount of $10,875,144 and authorized a 5% contingency of $543,756 for a total of $11,418,900 for the Mayfield Road paving, drainage and water improvements and Airport Detention Pond with water and wastewater improvements.
The current Change Order No. 14 provides for final project adjustments in all sections.
Change Order No. 1 adjusted the amount of the construction contract from $10,875,144 to $10,950,981; the difference of $75,837 was necessary to cover general construction items ( listed under Section VIII of the contract) to include site preparation, construction staking, barricading and traffic control, joint stormwater pollution prevention plan and as-built survey.
Change Order No. 2 in the amount of $65,588 provided for minor adjustments of one fire hydrant and 6 linear feet of 48 and 27 RCP storm drain due to conflicts with other existing utilities. It also provided for the installation of 77 Linear feet of 30 water pipe and 30 valve and other related items at Traders Village water tower site;
Change Orders No. 3 and No. 4 made adjustments for project traffic control. No funding was required.
Change Order No. 5 provided for adjusting an existing 24 waterline where it conflicted with a proposed channel crossing; it also provided for the installation of a driveway approach south of the airport as well as minor adjustments to proposed Storm Sewer manhole and miscellaneous pavement striping. This change order also provided for a rebate to the city for storm sewer embedment where crushed concrete was used in lieu of crushed stone embedment as specified in the construction contract.
Change Order No. 6 provided for the installation of an 8 water main by open-cut and trenchless methods; re-mobilization for the batch plant set up and the deletion of stamped concrete from the crosswalks at Mayfield Road and SH 360.
Change Order No. 7 provided for adjustment of storm drain inlets in conflict with proposed sidewalk, ground water control for storm drain outfall structure, waterline service adjustments, relocation of a storm drain inlet, channel improvements upstream of 54 RCP storm drain, additional driveway paving and other miscellaneous items of work.
Change Order No. 8 provided for the concrete cap over an existing shallow 24 water main in Mayfield Road. It also provided for a driveway replacement for the Chesapeake site at Great Southwest Parkway installed since this project was bid, the installation of metal beam guard rail fence at a headwall structure and other miscellaneous adjustments.
Change Order No. 9 provided for SH 360 & Mayfield Road interchange improvements consisting of an extension of existing left-turn lanes on Mayfield Road under SH 360 to increase storage capacities and installation of advanced left-turn lanes for Westbound and Eastbound Mayfield Road at the Northbound and Southbound Frontage Roads for SH 360. These improvements were included in Mayfield Road construction project since the advanced left turn bay east of northbound frontage road is already included as part of the project. Change Order No. 10 also provided for additional concrete driveway repairs for a new gas well in Great Southwest Parkway, additional concrete pavement at Parham Drive for smoother transition from Mayfield Road and some sidewalk repairs.
Change Order No. 10 provided for drainage revisions for a flume between Traders Village and Airport detention pond, Forum Drive pavement adjustments for improved rideability and other miscellaneous adjustment.
Change Order No. 11 provided for the addition of grouted rock rip-rap around the Airport detention to prevent erosion, addition of landscaping in the parkway along Family Dollar and the Furniture Store, grading on Trader's Village property to eliminate excessive run-off into Mayfield Road, pavement removal and replacement at Mayfield Road and SH 360, to improve surface drainage and connection to existing pavement, additional wrought iron fence at the Airport perimeter and to include revisions to the Entry sign proposed at SH 360 and Mayfield Road and other miscellaneous adjustments.
Change Order No. 12 provided for the widening of the curb returns at the Northwest and Southwest corners of Mayfield Road and Great Southwest Parkway. The $18,288 increase was for work to facilitate 18-wheeler traffic movement between the islands and the back of the curb and will also discourage large vehicles from jumping the curb. This change order provided a credit to the City in the amount of $9,000 because there was no need to offset uneven pavement surface in the center lane of Mayfield Road thus reducing this change order increase to the net amount of $9,288 . It also provided for the replacement of street signs at SH 260 and Mayfield intersection and other miscellaneous items of work.
Change Order No. 13 provided for pavement marking adjustments in sections I, II and IX along with the deletion of a ramp.
Change Order No. 14 provided for required ADA sidewalk adjustments.
Financial Consideration
State statutes require City Council approval of a change order when the cumulative cost of this change order exceeds $25,000. With approval of this change order, the City Manager will be able to approve the change order to a cumulative value of $25,000 without additional Council approval. Also, the City, as an owner, reserves the right to increase the amount of work to be performed in a given construction contract by an amount not to exceed twenty-five (25%) percent of the original bid. The amount of this contract is $10,875,144 and the 25% value of this contract is $2,718,786.
No additional funding is requested.