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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Dredging and Sediment Management

Guam Deep Ocean Disposal Site (G-DODS)

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On September 8, 2010 EPA published the Final Rule designating G-DODS as the newest ocean disposal site in Region 9. Previously, all sediments from Port, Navy, or other dredging projects around Guam had to be disposed on land where capacity is limited. G-DODS provides an additional option for managing dredged sediments when other options aren’t available. This site was chosen after two years of evaluation as the location that best avoids environmental impacts while still being close enough to Guam to be affordable to use. As with all of EPA’s other dredged material disposal sites, only projects having clean (non-toxic) dredged material may be permitted to use G-DODS, and only when project-specific alternatives (including beneficial reuse) are not practicable.

Disposal Site Information

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Location Approximately 11 nautical miles NW of Apra Harbor, Guam (see map)
Center coordinates 13° 35.500' N by 144° 28.733' E (NAD 83)
Water Depth 8,790 feet (2,680 meters) at center
Overall Size 7.1 square nautical miles [3 nautical mile (5.6 kilometer) diameter on seafloor]
Shape Circular
Surface Disposal Area 3,280 feet (1,000 meter) diameter circle at center of overall disposal site
Volume Limit 1.0 million cubic yards (764,555 cubic meters) of suitable dredged material per calendar year

Supporting Documents

Final EIS

More Supporting Documents

Meeting Presentation Materials

presentation slidePublic Meeting Presentations Slides, August 20, 2009 (PDF) (46pp, 6.4M)

Contact Information

Allan Ota (ota.allan@epa.gov)
Tel. (415) 972-3475

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