Ordnance Reef Hawaii

Aloha & Welcome to Ordnance Reef
Project Overview

Office of the Deputy Assistant Secretary of the Army for Environment Safety and Occupational Health (ODASA-ESOH)) with Federal, State and Local partners have teamed together in Oahu Hawaii to address various issues identified off of the Waianae Coast relating to a Discarded Military Munitions site, Ordnance Reef (Site HI-06). The U.S. Department of Defense’s will assess the potential risk to human health and the environment, identify munitions disposal options, establish and Ordnance Reef Outreach Plan and initiate institutional controls promoting unexploded ordnance safety, and remove energetics that wash ashore. Ordnance Reef (Site HI-06) is located on the West Coast of the island of O‘ahu, Hawai‘i, more commonly referred to as the Leeward Coast. This is a fairly large rural geographical area. The communities immediately surrounding Ordnance Reef (Site HI-06) are Kapolei, N?n?kuli, M?‘ili, and Wai‘anae. Site HI-06 is located approximately 2 miles south of Waianae’s Pokai Bay.

Sea Disposal Site HI-06 is the primary focus of the Ordnance Reef Project. During a benthic survey of the Island of Oahu’s western outfall diffuser in 1992, the City and County of Honolulu, Department of Wastewater Management’s oceanographic team discovered military munitions between 0.3 and 0.6 miles northwest of the diffuser. Military munitions were observed on the ocean bottom between 60 and 120 feet of sea water. All military munitions observed were described as unexploded ordnance (UXO). USACE requested Explosive Ordnance Disposal Mobile Unit THREE Detachment Middle Pacific (EODMU3 DET MIDPAC) located at Pearl Harbor, Hawaii to conduct an underwater survey to determine the location and scope of UXO present at Site HI-06 and identify the various amounts and types of military munitions involved. A variety of military munitions were located during the survey including, but not limited to, 8 inch naval gunfire projectile ammunition, 105mm and 155mm artillery projectiles, a naval mine, mortars, bombs, and SAA. Approximately 2,000 military munitions were identified by size and type. A complete listing of munitions types and locations can be found in this report (020729 EOD Incident Report - Support to POH.PDF). EODMU 3 DET MIDPAC reported the munitions as DMM, not UXO because the munitions were either not fuzed or had not been fired or dropped as designed to initiate it s arming sequence therefore the munitions did not pose an immediate risk.

The National Oceanic and Atmospheric Administration (NOAA) conducted a screening-level survey of Site HI-06 (Ordnance Reef) in 2006. This study confirmed the original report and also made an initial assessment of the potential Munitions Constituents (MC) at Site HI-06. The NOAA study found little or no evidence of MC derived from the DMM.

Independent assessments of results from the surveys concluded there was no imminent or substantial threat to human health or to the environment, from either the explosive hazards or a potential release of MC from the DMM. The assessment of the explosive risks found that the greatest risk is from activities that deliberately disturb the munitions. All other risks are considered minimal, and the implementation of an explosives safety education program would minimize the risk posed by the presence of these munitions.

Funding for the Ordnance Reef Project was made possible through the efforts of Hawai‘i’s Congressional delegation and by the DoD (Office of the Deputy Assistant Secretary of the Army for Environment Safety and Occupational Health (ODASA-ESOH)) through its National Defense Center for Energy and the Environment.

This website will provide the public with accurate and timely information about the program and its results.

Last Modified: 19 March 2014 at 09:52