Data book on groundwater chemistry in the Tono area

This data book is the revised edition of the previous data book, made by Iwatsuki et al. (2001). Chemical data of groundwaters from 5 boreholes (MIU-4, DH-2, DH-3, MSB-2 and MSB-4) and those for onsen (spa) (Mikai and Hayakawa, 1970) are added to the previous edition. This data book presents the chemical data for groundwaters, surface waters and rain waters in the Tono area, obtained up to the beginning of April 2003. Compositions for about 350 waters are tabulated. These data were acquired over a period of more than 15 years, during many different studies that had various purposes. The data were obtained through the uranium exploration, the hydrochemical investigation within and around the Tono Mine, the regional hydrogeological study and the hydrochemical investigations within the Shobasama site and the MIU (Mizunami Underground Research Laboratory) construction site. While considerable effort has been expended to transcribe data correctly from the various sources, a care must be taken to read the data because of uneven quality in the data due to different methods of sampling and analyzing. Therefore report indicates the data sources, the geographical locations where the data were obtained and the main sampling and analytical methods respectively in order to reconfirm the suitability of the data for each appraisal purpose. (author)