Mesothelioma is caused by asbestos inhalation

Asbestos is a generic term for a group of six naturally occurring fibrous silicate minerals. The predominant fibrous nature of minerals found at the W.R. Grace/Zonolite Site are of the tremolite-actinolite solid solution series (referred to in this Action Memo as amphibole asbestos).

Asbestos can cause asbestosis and is a recognized human carcinogen, causing lung cancer and mesothelioma, a lethal neoplasm of the lining of the chest and abdominal cavities. Cancer of the larynx and esophageal lining have also been associated with exposure to asbestos. Commercial forms of asbestos have been found to be carcinogenic in experimental animals.

An investigation is currently being undertaken by the Agency for Toxic Substances and Disease Registry (ATSDR) to determine if these asbestos-related diseases have been found, to an unprecedented extent among former plant workers, their families, and to nearby residents with no known occupational or family connection to the vermiculite processing operations in Hamilton Township, New Jersey. Initial interviews by EPA with former plant workers indicate some anecdotal incidence of asbestos-related injuries.

Actual and/or threatened releases of asbestos from this Site, if not addressed by implementing the response action selected in this Action Memorandum, may present an imminent and substantial endangerment to public health, or welfare, or the environment.