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News Release

FOR IMMEDIATE RELEASE
October 10, 2002

Environmental Study Results of Eisai Site in Funado, Itabashi-ku

Tokyo (October 10, 2002) Eisai Co., Ltd. (Headquarters: Tokyo, President: Haruo Naito), has conducted a study of the soil and groundwater conditions of an idle plot of land owned by the Company, located at 13-24, Funado 4-chome, Itabashi-ku, Tokyo. Tests of the 2,185m2 site showed that pollution exceeded standard levels, and on October 9, Eisai submitted to the Itabashi Ward office a report on soil contamination along with a cleanup plan.


  1. 1.In soil tests, total mercury and arsenic eluants as well as total mercury and copper content exceeded permissible levels. Regarding eluant maximum values, total mercury was 9.4 times the environmental standard value and arsenic was 6.4 times the standard value. Regarding content, the maximum value for total mercury was found to be 130 times the reference value used by Itabashi Ward, while copper was 1.4 times the reference value.

  2. 2.In groundwater, the maximum value detected for total mercury 7.6 times the environmental standard value, and arsenic was 3.6 times the standard value. These were determined to be localized, and we confirmed that no contamination had penetrated beyond the site. The maximum value detected for Cis-1,2 dichloroethylene was 1.03 times the environmental standard value, but a second test yielded results below the environment standard value.

  3. 3.Concentrations of mercury and arsenic as airborne dust were within permissible levels as specified by the WHO Regional Office for Europe Guidelines and, therefore, do not pose a threat to human health.


From 1957 until 1989, the land in question was the factory site of Sansho Co., Ltd. (currently Sannova Co., Ltd., an Eisai subsidiary). Past production and R&D activities were investigated, but the source of the contamination could not be identified.
Based on the cleanup plan submitted to Itabashi Ward Office, the company intends to remove the contaminated soil, undertake a purification process, and also bring in clean soil.