Work includes construction of new sidewalks, sidewalk connectors, driveway approaches, curb ramps, curbs and/or gutters; reconstruction and/or repair of existing sidewalks, sidewalk connectors, driveway approaches, curb ramps, curbs and/or gutters; removal and disposal of various existing pavements, trees, tree roots and debris; grading and preparation of subgrade and sodding; and adjustment of existing utility valve covers to new finished grade. One or a combination of more than one of the work described herein may be required to be performed at any given site pursuant to the requirements of the Work Order governing the site. If any changes are required due to conflict of design and or field conditions, the Engineer will make the final determination. The Contractor and all subcontractors, under this Contract, are prohibited from performing any work, other than specified in the Contract and/or directed by the Engineer, within the limits of the project site, without prior written notification to the Engineer. This includes any work for private or commercial entities.