A. Task 1 – Containment Pond Sediment and Debris Removal / Disposal 1. Removal of accumulated sediment and debris in the area located between the Containment Pond dam and Maine Avenue. All excess material will be removed, and the cross section of the containment area and upstream Domestic Canal shall be returned to the original design specifications as detailed on Sheet 2 of Appendix B. 2. Removal of sediment and stone clogged with sediment in the concrete bench drains located on both the northern and southern sides of the Containment Pond, followed by the replacement of any damaged perforated piping (as needed) and specified stone to return these structures to their original design specifications, will also be required. These specifications are detailed on Sheet 2 of Appendix B. 3. Flow diversion (in the form of driven piles or coffer dams) and project phasing (detailed on Sheet 2 of Appendix B) will be necessary to minimize erosion and sedimentation to downstream waterbodies (Birch Stream) during this task. The type and configuration of flow diversion will be at the Proposer’s discretion but must be approved by the City prior to the commencement of the project. 4. The final stage of this task will require the completion of appropriate stabilization. Stabilization methods are detailed in the specifications (Detail A3, C1, and D1) and the Notes found on Sheet 2 of Appendix B. All excavated material will be dewatered (as needed for transport) and disposed of off-site. 5. Includes the following line items, which are referenced on the mandatory Bid Form (pages 10-16). a. Mobilization – priced per lump sum (LS). b. Adequate erosion and sediment control measures to protect adjacent natural resources in accordance with all State and local regulations – priced per lump sum. c. Confirm the location of all existing utilities in the field – priced per lump sum. d. Dewatering and flow diversion – priced per lump sum. e. Sediment and vegetation removal and disposal – priced per lump sum. f. Remove and replace bench drain stone, as required, following sediment removal – priced per cubic yard (CY): Approx. 50 CY in total. g. Remove and replace perforated piping in concrete bench drains, if damaged or deemed necessary following the completion of Bid Form - Task 1 - Items 5 and 6, due to sludge contamination - Priced per linear foot (LF): Approx. 220 LF in total. h. Restore all vegetated areas, stabilize and return all areas disturbed during the project to original design specifications – priced per lump sum.
