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. ~ ,,~ III <br />PEABODY <br />,WESTERN <br />IIIIIIIIIIIII III <br />Peabody Western Coal Company <br />February 26, 1993 <br />RECEIVED <br />Ms. Susan Morrison <br />Colorado Division of <br />Minerals and Geology <br />1313 Sherman Street <br />Suite 215 <br />Denver, CO 80203-2273 <br />MAR 2 1993 <br />DIVijlUfl lii iri,iiu~u~~ u VcUi <br />oyy <br />RE: Seneca II Mine Annual Hydrology Report <br />State Permit No. C-80-005 <br />Dear Ms. Morrison: <br />Enclosed please find three (3) copies of the 1992 <br />Annual Hydrology Report for the Seneca II Mine. <br />This report contains a compilation and analysis of <br />all hydrologic data collected during the period <br />extending from October 1, 1991 through September <br />30, 1992. Four (4) copies of this report were also <br />forwarded to the Office of Surface Mining <br />Reclamation and Enforcement to the attention of <br />Rick Holbrook (Western Field Office - Denver) .and <br />one (1) copy was sent to Donna Griffin (Albuquerque <br />Field Office). <br />The ground and surface water quality statistical <br />summaries should be reviewed with caution. Those <br />parameters which have censored values associated <br />with the data set (i.e., some of the trace <br />elements) cannot be correctly analyzed <br />statistically in Peabody's current database, and <br />summary statistics for these should be disregarded. <br />When reviewing these data, the reader should refer <br />directly to the individual water quality analyses <br />for determining which values are above or below the <br />detection limit. Peabody is developing a <br />statistical algorithm for the water quality <br />database to address censored data sets. <br />Peabody Westam Ceal Company • 1300 South Yab Sheet • Flogslaff, Arizona 86001 • Taleplwna (602) 774-S43J • Fax (604) 77~-4596 <br />