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Introduction <br />• <br />The information assembled in this 1991 Annual Hydrologic Report (AHR) includes data <br />collected from approved monitoring sites established at Peabody Coal Company's Nucla Mine <br />(Permit No. C-81-008). Surface eater information assembled include instantaneous and mean <br />daily discharge measurements, NPDES discharge monitoring reports, and water quality <br />analysis results. Ground water information include water level measurements and eater <br />quality analysis results. Reported surface and ground eater information collected at <br />monitoring sites associated with Peabody's Nucla Mine encompass the 1991 water year <br />(October 1, 1990 through September 30, 1991). Locations of monitoring sites discussed in <br />this report can be found by referring to Exhibit ~, Hydrology Monitoring Site Location <br />Map, submitted as part of the 1988 AHR for the Nucla Mine. <br />The following sections present discussion about monitoring activities conducted during the <br />1991 water year as part of the approved hydrologic monitoring program during temporary <br />cessation (see Appendix 15-4, Tab 15, revised Nucla PAP). <br />Precipitation DaTa <br />• <br />Precipitation data for the environs of the Nucla Mine from January 1980 through September <br />1991 are presented in Table 1. Included ere data for stations at Norwood, Uraven, end et <br />Nucla East (refer to Tab 8, revised Nucle PAP). The Nucla Eest station consists of one <br />Belfort Model 5-780 universal recording rain gauge, equipped with a 32-day electric drive <br />chart recartler, and a 12-inch capacity uei 9hing bucket. This gauge has. been in reliable <br />operation since August 26, 1987. <br />Surface Water <br />Cessation Monitoring Program at Nucfa Mine. Monitoring activities conducted at the Nucla <br />Mine during the 1991 water year were performed in accordance with the approved hydrologic <br />monitoring program during temporary cessation. Table 2 provides a summary of surface <br />water monitoring sites and monitoring frequencies during temporary cessation associated <br />with the Nucla Mine. NPDES monitoring was performed in accordance ui th Peabody's Nucla <br />Mine NPDES Permit CO-0000213 (as amended on July 25, 1990). <br />lI ,1 <br />u <br />1 <br />