On July 7, the Okinawa Defense Bureau and city government released
the results of their investigation into contamination from barrels found
at a soccer ground on land returned by the U.S. military in Okinawa
City. They detected dioxin and other harmful ingredients in all
substances analyzed. The samples were taken from fouling material and
bottom soil in the area around the barrels.
The city detected dioxin in the filtrate water around the barrels at a
level 64 times the Environmental Quality Standard for groundwater. The
bureau detected dioxin at 55 times the standard. The city detected
dioxin in fouling material at a level 2.9 times the normal standard for
soil, while the bureau detected 1.9 times the standard.
The bureau and city took the same substance samples from 61 barrels and separately conducted their analysis.
The bureau detected dioxin at a level over the standard in five of the fouling material samples, while the city detected three.
Although they detected dioxin at a level under the accepted standard
in all 29 samples taken from bottom soil, the levels were higher than
that requiring caution.
The bureau and city found the key ingredients of Agent Orange–2, 4, 5-T,
trichlorophenoxyacetic acid and 2, 4-dichlorophenoxyacetic in the
filtrate water around the barrels.
However, the bureau said, “We cannot use it as proof of the
defoliant. We infer that it is chemical herbicides.” The city stated
that harmful substances, including polychlorinated biphenyls and
Pentachlorophenol caused the pollution of the soil and groundwater at
the site. However, they declined to say that what they found was Agent
Regarding the results of their investigation, the bureau and city
stated that there was no influence on the surrounding environment and
groundwater at the site.