1. IR Site 7 Sediment 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
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)
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
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

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)
Chemical
SMO (dry)
ER-L
ER-M
Copper
254 ppm
34 ppm
270 ppm
Lead
100 ppm
46.7 ppm
218 ppm
Mercury
0.9 ppm
0.15 ppm
0.71 ppm
Silver
3.5 ppm
1 ppm
3.7 ppm
Zinc
307 ppm
150 ppm
410 ppm
Total PAH
5400 ppb
4022 ppb
44,792 ppb
Total DDT
210 ppb
1.58 ppb
46.1 ppb
Total PCB
570 ppb
22.7 ppb
180 ppb

12. POLB Remedial Investigation

13. Sediment Sampling Results
AOEC
Metals Detected
Above SMOs
Depth of Contamination
Dredging Depth
(+ overdredge) A
copper, lead, mercury, zinc
4 feet
4 + 2
C-East
none
N/A
2 + 2
C-West
mercury, zinc

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