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IR Site 7 Sediment Remediation

IR Site 7 Sediment Remediation. Presented to: WEDA 2009 Annual Meeting. Introduction. Installation Restoration (IR) Site 7 Why is this project unique to POLB? Shipyard contaminants Collaboration between DOD, regulators, POLB Project initiated solely for purpose of remediation.

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IR Site 7 Sediment Remediation

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  1. IR Site 7Sediment Remediation Presented to: WEDA 2009 Annual Meeting

  2. Introduction • Installation Restoration (IR) Site 7 • Why is this project unique to POLB? • Shipyard contaminants • Collaboration between DOD, regulators, POLB • Project initiated solely for purpose of remediation

  3. Project Location

  4. Site History • Navy acquired beachfront and submerged lands from City of Long Beach in 1938 • Naval Shipyard opened in 1943, Naval Station opened in 1946 • LB Naval Station closed in 1994 (BRAC II); LB Naval Shipyard closed in 1997 (BRAC IV) • In 1998, part of property reverted back to City, part is leased to Port until completion of transfer(s)

  5. Who’s involved in this project? • BRAC Cleanup Team (BCT) • Navy, USEPA, DTSC, RWQCB • Port of Long Beach • Lease in Furtherance of Conveyance (LIFOC) • Resource Agencies • USFW, CDFG, NOAA (NMFS) • Restoration Advisory Board (RAB) • Army Corps of Engineers

  6. Sources of Sediment Contamination and CoCs Sources: • Process waste tanks dumped into West Basin, including plating wastes • Storm drains • Dry dock flushing (liquid chemicals, fuels, oils, and sand blasting materials) Chemicals of Concern (CoCs): • Copper, lead, mercury, silver, zinc, PAHs, DDT, and PCBs

  7. Areas of Ecological Concern

  8. The Process (aka, Paperwork) • 2007 – Record of Decision • 2007 – Pre-Design Sampling Report • 2008 – Negative Declaration • 2009 – RD/RA Work Plan • 2009 – Bids Accepted and Award • 2010 – Dredging/Sequestration • 1994 – Navy starts Site 7 investigation • 1997 – Remedial Investigation Report • 2001 – Tech Memo #1 • 2003 – Feasibility Study Report • 2005 – POLB/DTSC Consent Agreement • 2006 – Proposed Plan

  9. Remedial Action Objective To protect the presence of ecologically productive and diverse benthic communities in the sediments of IR Site 7 AOECs, consistent with existing land use.

  10. Sediment Management Objectives • Derived using matched data sets of chemical concentrations combined with three biological measures (the “triad” approach): • Amphipod survival bioassays • Echinoderm larval development bioassays • Benthic community structure analyses • The lowest chemical concentration exhibiting any effects becomes the SMO

  11. Remediation Goals (SMOs)

  12. POLB Remedial Investigation

  13. Sediment Sampling Results

  14. STLC Sampling • DTSC raised concerns during the CEQA review • 6 samples from June 2007 selected for Soluble Threshold Limit Concentration (STLC) testing • Confirmed that sediments are not hazardous waste and will not pose a risk to groundwater resources under the fill site

  15. RD/RA Work Plan Elements • Evaluated potential water quality impacts at the point of dredging and at the point of disposal using USACE computer models • Evaluated expected post-dredging residual amounts and chemical concentrations • Evaluated long-term effectiveness of the disposal location by calculating overall flux through the containment berm using the Reible model • Developed a confirmation sampling plan to verify successful removal of the chemically impacted sediments

  16. RD/RA Conclusions and Recommendations • Planned remedial design is consistent with previous site investigations and satisfies ROD • Confirmatory samples will be obtained after dredging each AOEC to determine additional sediment removal • Residual sediments are expected to be present on the seafloor after completion but are predicted to contain chemical concentrations that are below SMOs • Water quality impacts at the point of dredging and disposal were modeled and are predicted to be negligible at a compliance boundary of 300 feet.

  17. Green Port Project Elements • Local “encapsulation” of chemically-impacted sediments at Pier G Slip Fill • Electric clamshell dredging using local grid • Silt curtains and other water quality BMPs • Particulate filters and oxidation catalysts used on all possible diesel equipment • Tier 2 harbor craft or equivalent • Low-sulfur fuels in harbor craft • Collaboration with ACOE/Main Channel Project

  18. THANK YOU For more information: Christine Houston houston@polb.com

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