Discuss, consider, and take appropriate action regarding Change Order No. 7 in the amount of $302,109.20 for Project 1810-265-North Mays Extension (Capital Excavation) P: 224 Funding Source: Road Bond.

This Change Order provides the final balancing for the overrun of Contract quantities on the project as a result of addressing field conditions not accounted for in the original plans. This Change Order adds items to compensate the Contractor for various work including installation of soil stabilization measures under the bridge and a Force Account item to pay for the installation of Oncor illumination poles, wire and conduit south of the bridge.

The following is a description of new items added to the Contract by this Change Order:

Item 416-WCO1 Drill Shaft Test Cores. This item pays for additional cores at the bottom of the drill shafts to confirm the depth of bearing material supporting the foundation. 
Item 730-WC01 Mowing/Maintenance. This item pays for mowing and litter pickup on the project at the request of the City of Round Rock prior to final acceptance of the project. 
Item 164-WC01 Seeding for Erosion Control (Under Bridge Seed Mixture Special). This item pays for a special seed mixture recommended by the Lady Bird Wildflower Center placed under the bridge. 
Item 550-WC01 Fencing (Chain Link). This item pays for modifications to an existing chain link fence so that it would match the new driveway constructed by the project. 
Item 341-WC03 Asphalt Repair. This item pays for repair to asphalt pavement to correct the cross slope in a pedestrian cross-walk to meet the ADA requirements.

Due to the lack of exposure to sunlight and rainfall, vegetation did not establish under the bridge. To provide stabilization, heavy soil retention materials are being added to prevent erosion from drainage under the bridge. The plans and materials have been reviewed and approved by the City of Round Rock and the Water Control and Improvement District (WCID). 

Item 999-WC06 Mobilization for Soil Stabilization under the Bridge. This item pays for mobilization of equipment and management for the installation of soil stabilization materials under the bridge.
 Item 999-WC07 Survey for Soil Stabilization under the Bridge. This item pays for survey for the installation of soil stabilization materials under the bridge. 
Item 999-WC08 Fine Grading for Soil Stabilization under the Bridge. This item pays for grading prior to the installation of the soil stabilization materials. The grading will provide a smooth surface according to the manufacturer’s installation directions. 
Item 999-WC09 Flexamat. This item pays for the soil stabilization materials to be installed under the bridge. Flexamat will be placed in the areas of the highest flows of water to prevent erosion. 
Item 999-WC10 Pyramat. This item pays for the soil stabilization materials to be installed under the bridge. Pyramat will be placed in the remaining areas to prevent sediment loss.
Item 999-WC11 Seeding for Erosion Control (City of Round Rock Mixture under the Bridge. This item pays for application of seed prior to the installation of the soil stabilization materials. The seed is being placed at the request of the City. 
Item 999-WC12 Skid Steer for Grading. This item pays for the use of a Skid Steer Loader to make repairs to erosion under the bridge outside the limits of the installation of the materials.
 
After the project was designed, Oncor notified HNTB that they no longer installed or maintained illumination circuits on a bridge. Oncor requested that the illumination on the bridge be separated from the remaining illumination circuits on the project. To accommodate this request, the illumination on the bridge will be added to a circuit just south of the bridge.  Adding to the existing circuit minimized the impact of the changes.  A Force Account Item is being added to pay for the installation of five (5) more illumination poles, additional wire and conduit to address Oncor’s request. 

Item 999-WC13 Force Account for Oncor Illumination.  This item is a force account item to pay for the installation of poles, wire and conduit for the modifications to the Oncor illumination circuits south of the bridge.  The actual cost of the work will be tracked and paid in the new item.      

This Change Order results in an increase of $302,109.20 to the Contract amount, for an adjusted Contract total of $11,750,980.68. The original Contract amount was $10,775,835.75. Because of this and all other Change Orders, $975,144.93 has been added to the Contract, resulting in an 9.05% net increase in the Contract cost. No additional days will be added to or deducted from the Contract as a result of this Change Order.