Specifications include, but are not limited to: The landscaped island is to be retrofitted into an approximately 800 sq. ft. bioretention cell (hereafter referred to as BRC). The contractor is responsible for all demolition and construction, as well as the installation of a catch basin filter bag to control sediment erosion into the existing catch basin. The BRC will be installed within a portion of the existing footprint of the landscaped island in the office parking lot of the Cypress Pointe Apartments at 4861 College Acres Drive, Wilmington, NC 28403 (see figures 1, 2 and the attached plan sheets below). The contractor should minimize disturbance of the area within the landscaped island outside of the footprint to be retrofitted into the BRC and preserve as much of the existing shrubbery as is possible. The BRC shall be comprised of various layers of permeable media and base materials as specified in the attached plan sheet. The stone base layer shall be drained by a perforated PVC underdrain with cleanout valves, observation wells, and routed to an existing stormwater catch basin (see attached plan sheet). The BRC, underdrain, and observation wells shall be included in ongoing stormwater research at NC State University. The contractor is responsible for full clean up and proper off-site disposal of any construction debris and residual material. All trash shall be cleaned up daily. While unforeseen, excess earth shall be wasted and stabilized with seeding (temporary and permanent) and mulching on site before demobilization and final acceptance by the University. Sediment shall be prevented from being transported off site by stormwater runoff throughout the project (see attached plan sheet). The contractor is NOT responsible for the purchase nor installation of BRC plants. All bids shall include (1) BRC material specifications (river rock selection, filtration media selection, properties of bedding and base materials), and (2) total costs (e.g., materials, erosion control, delivery, installation, etc.).