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r~ PQ~4 <br />SIE Cov~n~~1 <br />PEABODY COAL COMPANY <br />Western Division <br />February 24, 1992 <br />Ms. Susan Morrison <br />Colorado Mined Land <br />Reclamation Division <br />1313 Sherman Street <br />Suite 215 <br />Denver, CO 80203 <br />RE: Seneca II-W Mine <br />State Permit No. <br />Federal Permit No <br />Dear Ms. Morrison: <br />oo~ /~7y^q /j <br />1300 So ~ I ""`-' I ~v <br />Flagstaff, Arizona 66001 <br />1602)77n-5253 <br />RE~EI~/ED <br />F E B 2 8 1992 <br />Mined Land <br />Reclamation nip"~'~r <br />Annual Hydrology Report <br />C-82-057 <br />. CO-0067 <br />Enclosed please find three (3) copies of the 1991 <br />• Annual Hydrology Report for the Seneca II-W Mine. <br />This report contains a compilation and analysis of <br />all hydrologic data collected during the period <br />extending from October 1, 1990 through September <br />30, 1991. 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 currently developing a <br />statistical algorithm for the water quality <br />database to address censored data sets. <br />u <br />