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• Introduction <br />The information assembled in this 1989 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). In addition, hydrologic baseline data collected from monitoring <br />sites established at Pea body's proposed Nucla East mining area are presented. Surface <br />water information assembled include instantaneous and mean daily discharge measurements, <br />NPDES discharge monitoring reports, and water quality analysis results. Presented ground <br />water information include monthly water level measurements and water quality analysis <br />results. Reported surface and ground water information collected at monitoring sites <br />associated with Pea body's Nucla Mine and the Nucla East area encompass the 1989 water year <br />(October 1, 1988 through September 30, 1989). Locations of monitoring sites discussed in <br />this report can be found by referring to Exhibit 1, 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 />1989 water year as part of the operational monitoring program approved for Peabody's Nucla <br />• Mine. An update of monitoring activities performed at baseline monitoring sites <br />established at Peabody's Nucla East area is also provided. <br />P reci of to tion Data <br />Precipitation data for the environs of the Nucla Mine and proposed Nucla East mining area <br />from January 1980 through September 1989 are presented in Table 1. Included are data for <br />stations at Norwood, Uravan, and at Nucla East (refer to Tab 8, revised Nucla PAP). The <br />Nucla East station consists of one Belfort Model 5-780 universal recording rain gauge, <br />equipped with a 32-day electric drive chart recorder, and a 12-inch capacity weighing <br />bucket. This gauge has been in reliable operation since August 26, 1987. <br />t....L-.... 41~~..- <br /> Operational Monitoring Program - Nucla Mine. Monitoring activities conducted at the Nucla <br /> Mine during 1989 were consistent with the operational monitoring program outlined in the <br /> revised Nucla PAP and the 1988 AHR for Nucla. Table 2 provides a summary of surface water <br />• monitoring sites assoc iated with the Nu cla Mine. <br />1 <br />