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HD Pilot Test Work Plan Hydraulic Dredge Pilot Test Work Plan Former North Water Street Manufactured Gas Plant Site Poughkeepsie, NY NYSDEC Site ID No. C314070 Central Hudson Gas and Electric Corp August 26, 2020 Pilot Test Work Plan Project reference: Central Hudson Gas and Electric Corp. Prepared for: Central Hudson Gas and Electric Corp. 284 South Avenue Poughkeepsie, New York Prepared by: AECOM 125 Broad Street New York, NY 10004 aecom.com Copyright © 2020 by AECOM All rights reserved. No part of this copyrighted work may be reproduced, distributed, or transmitted in any form or by any means without the prior written permission of AECOM. AECOM Pilot Test Work Plan Project reference: Central Hudson Gas and Electric Corp. Table of Contents 1. Introduction ......................................................................................................................................... 5 1.1 Background ............................................................................................................................... 5 1.2 Pilot Test Objectives ................................................................................................................. 6 1.3 Work Plan Organization ............................................................................................................ 6 2. Preliminary Pilot Test Activities and Determination of Test Areas ....................................................... 8 2.1 Geotechnical Investigation ....................................................................................................... 8 2.2 Sediment Dewatering Treatability Study .................................................................................. 9 2.3 Identification of Equipment and Long Lead Items .................................................................... 9 2.4 Determination of Test Areas ..................................................................................................... 9 2.4.1 Proof of HDPT Concept Plan .................................................................................................... 9 2.4.2 Pilot Dredge Plan Within Central Area Footprint .................................................................... 10 2.4.2.1 Area 2 ................................................................................................................................ 10 2.4.2.2 Area 3 ................................................................................................................................ 10 3. Equipment and Operation ................................................................................................................. 12 3.1 Fixed Arm Excavator with High Solids HD Pump with Shroud ............................................... 12 3.1.1 Equipment ............................................................................................................................... 12 3.1.2 Operation ................................................................................................................................ 12 3.1.3 Dredging Compliance/Completion Determination .................................................................. 13 3.2 Debris and Over-Sized Material Removal .............................................................................. 13 3.2.1 Equipment ............................................................................................................................... 13 3.2.2 Operation ................................................................................................................................ 14 3.3 Conveyance of Dredged Material to Dewatering Barges ....................................................... 15 3.3.1 Equipment ............................................................................................................................... 15 3.3.2 Operation ................................................................................................................................ 15 3.4 Dewatering of Dredge ............................................................................................................. 15 3.4.1 Equipment ............................................................................................................................... 15 3.4.1.1 Method 1 – Geotextile Tubes ............................................................................................ 15 3.4.1.2 Method 2 – Mechanical ..................................................................................................... 15 3.4.2 Operation ................................................................................................................................ 16 3.4.2.1 Method 1 – Geotextile Tubes ............................................................................................ 16 3.4.2.2 Method 2 – Mechanical ..................................................................................................... 16 3.5 Conveyance of Liquid from Dewatering Operation to WTP ................................................... 17 3.5.1 Measurement of liquid flow ..................................................................................................... 17 3.5.2 Equipment ............................................................................................................................... 17 3.5.3 Operation ................................................................................................................................ 17 3.6 Dewatered Dredge Material Transportation and Disposal ..................................................... 17 3.6.1 Equipment ............................................................................................................................... 17 3.6.2 Operation/Disposal Facility ..................................................................................................... 17 3.7 Backfill Operation ................................................................................................................... 17 3.7.1 Equipment ............................................................................................................................... 17 3.7.2 Operation ................................................................................................................................ 18 3.8 Existing On-Site Water Treatment Plant ................................................................................. 18 3.8.1 Equipment ............................................................................................................................... 18 3.8.2 Operation ................................................................................................................................ 19 4. Implementation ................................................................................................................................. 20 AECOM Pilot Test Work Plan Project reference: Central Hudson Gas and Electric Corp. 4.1 Proof of Concept ..................................................................................................................... 20 4.2 Central Area ............................................................................................................................ 20 5. Environmental Controls and Monitoring ........................................................................................... 22 5.1 Perimeter Sheen Control System ........................................................................................... 22 5.2 Control Actions........................................................................................................................ 22 5.3 Time-of-Work Administrative Control ...................................................................................... 23 6. Regulatory Approvals ........................................................................................................................ 24 7. Pilot Test Schedule ........................................................................................................................... 25 8. HDPT Final Summary Report ........................................................................................................... 26 9. References ........................................................................................................................................ 27 Figures Figure 1 – Geotechnical Boring Locations Figure 2 – Hydraulic Dredge Pilot Test Dredge Areas Figure 3 – Conceptual Equipment Layout Figure 4 – Excavator Profile Figure 5 – Conceptual Shroud Configuration for the Hydraulic Dredging Pump Figure 6 – Perimeter Sheen Containment System Season 3 Pilot Study Work Plan Appendices Appendix A Geotechnical Investigation Boring Logs Appendix B Geotechnical Investigation Analytical Results Appencix C Treatability Study Results Appendix D Filter Test Results Appendix E Check Valve Information AECOM Pilot Test Work Plan Project reference: Central Hudson Gas and Electric Corp. 1. Introduction AECOM USA, Inc. (AECOM) has prepared this Pilot Test Work Plan (PTWP) on the behalf of Central Hudson Gas and Electric Corporation (CHGE) to implement an in-river pilot test at the former North Water Street Manufactured Gas Plant (MGP) site (site) located at 2 Dutchess Avenue, Poughkeepsie, New York. The purpose of the pilot test is to assess the applicability of hydraulic dredging (HD) with a submersible high-solids dredge pump for removal of impacted sediment at the site. This PTWP provides details of the
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