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• Surface Vater <br />Operational Monitoring Prooram - Nucla Mine. Monitoring activities conducted at the Nucte <br />Mine through January, 1990 were consistent with the operational monitoring program <br />outlined in the revised Nutla PAP end the 1989 AHR for Nucla. For the remainder of the <br />1990 water year, monitoring activities at the Nutla Mine were performed in accordance with <br />the approved hydrologic monitoring program during temporary cessation. Table 2 provides a <br />summary of surface water monitoring sites and monitoring frequencies during temporary <br />cessation associated Lith the Nucla Mine. <br />Discharge values collected from surface water monitoring sites at tha Nucle Mine during <br />the 1990 water year are presented in Appendix A. This appendix also contains select <br />h ydrogrephs constructed from [he discharge date. Vater quality data collected et Nucla <br />Mine surface water monitoring sites can be found in Appendix C. <br />A renewal to Peabody's Nucla Mine NPDES permit (NO. [0-0000213) was i~s sued on September <br />29, 1989, with en effective date of November 1, 1989. The permit was revised on November <br />28, 1989 to include informal corrections. On July 25, 1990, the permit was emended to <br />remove NPDES Outfall 006 from the "active mining" category to the "postmining" category. <br />Appendix F toot sins the renewed NPDES permit (effective 11/1/89) end the permit amendment <br />(effective 7/25/89). <br />Monitoring activities conducted et the Nucle Mine during the 1990 eater year included <br />compliance monitoring as outlined in Peabody's NPDES Permit No. CO-0000213 et ou [fells <br />001, 002, 003, 004, 005 end 006. Through October 31, 1989, monitoring was conducted in <br />aetordente with the previous NPDES permit (effective 12/84, see Appendix 7-6, Tab 15, <br />Nucle PAP). From November 1, 1989 to July 25, 1990, monitoring was conducted according to <br />the terms end conditions of the renewed NPDES permit (effective 11/1/89). After July 25, <br />1990, NPDES monitoring was performed in ectordance with the emended NPDES permit <br />(effective 7/25/90, see Appendix F). Appendix 8 contains Discharge Monitoring Reports <br />(DMR's) for each outfall for the fourth quarter of 1989, and the first, second, and third <br />quarters of 1990. Discharge measurements collected at NPDES Site 006 (instantaneous) end <br />NPDES Site 001 icontinuous and instantaneous) during the 1990 water year ere presented in <br />Appendix A. <br />• During the 1990 water year, spoil spring surveys were conducted within end adjacent to the <br />7 <br />