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pQ~y III IIIIIIIIIIIIIIII <br />RECEIVE[ <br />PEABODY COAL COMPANY <br />Ws~tsrn Dl7rltlon <br />MAR 21 1991 <br />Mined Land <br />Reclamation Division <br />March 8, 1991 <br />Mr. Dan Mathews <br />Colorado Mined Land <br />Reclamation Division <br />1313 Sherman Street <br />215 Centennial Building <br />Denver, CO 80203 <br />RE: Seneca II-W Mine Annual Hydrology Report <br />State Permit No. C-82-057 <br />Federal Permit No. CO-0067 <br />Dear Mr. Mathews: <br />7300 Soutft Yele <br />FleBstafl, Arizona SS007 <br />(602) 774-5253 <br />Enclosed please find three (3) copies of the 1990 Annual <br />Hydrology Report for the Seneca II-W Mine. This report <br />contains a compilation and analysis of all hydrologic data <br />collected during the period extending from October 1, 1989 <br />through September 30, 1940. Copies of this report were <br />also forwarded to the Office of Surface Mining Reclamation <br />and Enforcement to the attention of Rick Holbrook (Western <br />Field Office - Denver) and Ron Sassman (Albuquerque Field <br />Office). <br />The ground and surface water quality statistical summaries <br />should be reviewed with caution. Those parameters which <br />have censored values associated with the data set (i.e., <br />some of the trace elements) cannot be correctly analyzed <br />statistically in Peabody's current database, and summary <br />statistics for these should be disregarded. When <br />reviewing these data, the reader should refer directly to <br />the individual water quality analyses for determining <br />which values are above or below the detection limit. <br />Peabody is currently developing a statistical algorithm <br />for the water quality database to address censored data <br />sets. <br />