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• Two additional surface water monitoring sites were added to the Nucla Mine monitoring <br />network in 1988, Sl'!-N8 and SW-N9 (see Exhibit 1, 1988 Nucla AHR). Discharge at both sites <br />was monitored continuously during the 1989 water year using stilling well pipes coupled <br />with Stevens Digital Water level Recorders. Appendix A of this AHR contains rating tables <br />developed for both sites during 1989 and daily discharge values measured during the 1989 <br />water year. Water quality was also monitored at both sites during 1989 for the same <br />constituents and at the same frequencies as other surface water monitoring sites <br />established at the Nucla Mine (see Appendix 15-1, revised Nucla PAP). Appendix D of this <br />AHR contains water quality data collected at both sites during the 1989 water year. <br />Discharge values collected from surface water monitoring sites at the Nucla Mine during <br />the 1989 water year are presented in Appendix B. This appendix also contains select <br />hyd rogra phs constructed from the collected discharge data. Water quality data and <br />statistical sunmaries of the water quality data collected at Nucla Mine surface water <br />monitoring sites can be found in Appendices D and E, respectively. <br />Monitoring activities conducted at the Nucla F1i ne during the 1989 water year included <br />compliance monitoring as outlined in Peabody's NPDES Permit No. CO-0000213 at outf alls <br />001, 002, 003, 004, 005 and 006. Appendix C contains Discharge Monitoring Reports (DMR's) <br />for each ou tfall for the fourth quarter of 1988, and the first, second, and third quarters <br />of 1989. Discharge measurements collected at NPDES Site 006 (instantaneous) and NPDES <br />Site 001 (continuous and instantaneous) during the 1989 water year are presented in <br />Appendix 0. <br />During the 1989 water year, spoil spring surveys were conducted within and adjacent to the <br />Nucla permit boundary. The first survey was conducted during May 1989, and the second <br />during September 1989. Both surveys involved visual observations for seeps and springs, <br />and resulted in no discovery of any additional spoil seeps or springs within the surveyed <br />area. <br /> The field equipment used for sampling conductivity and temperature at the Nucla Mine and <br /> tJucla East mi ning area (YSl conductivity meter) was tested for accuracy on 1•ta rch 17, 1989 <br /> and again on July 28, 1989. the Nucla conductivity meter was calibrated by measuring the <br /> conductivity of a 0,01 molar po to 55ium chloride (KC1) solution at 19° C. Based on the <br /> conductivity table for this solution at 19° C (YSI, 1979), [he conductivity of the <br /> solution was 1246 umhos. the Nuc la meter registered a conductivity of 1189 umho s in <br />7 <br />