芒什處置場位於諾曼第科坦丁（Cotentin）半島西部頂端處，由阿雷瓦核廢料回收公司（Areva Nuclear Cycle,，Areva NC）經營。該公司在此將用過的核子反應爐燃料再加工，做成可再次使用的鈾和鈽燃料。
Radioactive tritium from a nuclear waste storage facility in Normandy, France is leaking into groundwater that is being used by local farmers for their dairy cattle, according to a new report published by the French laboratory ACRO.
Contamination from the low and intermediate level nuclear waste disposal facility at la Hague, the Centre Stockage de la Manche (CSM), migrates from the dumpsite into the underground aquifers used by farmers, the Hérouville St Clair-based laboratory found.
"Because of its mismanagement, CSM is causing damage to the environment," said ACRO Director Dr. David Boiley. "Repeated incidents have led to a constant release, and as a consequence the ground water and many outlets are highly contaminated with tritium."
Located on the western tip of the Cotentin Peninsula in Normandy, the Areva NC La Hague site reprocesses spent nuclear power reactor fuel into reusable uranium and plutonium.
ACRO found that levels of radioactivity in the aquifer are on average 750 Bequerels per liter (Bq/l), - more than seven times the legal European safety limit of 100 Bq/l. In agricultural land close to the dumpsite, ACRO tests found levels in the underground aquifer during 2005 averaged 9000 Bq/l - 90 times above the safety limit.
"As far as the future situation," Boiley warned, "it could worsen in the long run because there is no guarantee that the wrappings of the older wastes, which also contain more hazardous elements, will last for long periods of time. When a new contamination is detected it will be too late."
"More than 30 years ago the French public were assured that selection of the CSM dumpsite was based upon extensive assessments of the geology and hydrology, and that there was no risk of contamination," said Shaun Burnie Greenpeace nuclear campaigner. "In reality," he said, "levels have reached thousands of times the natural background level."