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- NPDESI2. Mining in this basin began in 2000. Reconstruction of the <br />water augmentation Pond Y1 (Site YSSF2) was completed on September 13, <br />1999. It is now referred to as Pond 012 (NPDESI2) . This pond began to <br />flow again (after reconstruction) in April 2000. Flow at this pond is <br />continuous. The average flow value for this year was 0.1260 cfs, which <br />was 34% greater than the historic (2000-2014) average for Pond 012, <br />0.0938 cfs. The timing of when flow values are collected affects these <br />averages. A statistical summary of baseline chemistry data from Site <br />YSSF2 (Y1 outflow) and YSS3 (Y1 inflow) is provided in Appendix D1 of <br />the 2010 AHR. NPDESI2 exhibits a decreasing TDS trend, with the peak <br />value occurring in July 2007. <br />A slide north of Pond 012 was repaired in 2010 and 2011. An additional <br />pond, 012A, was constructed in August 2008 to compensate for the lost <br />capacity in Pond 012. Pond 012 was cleaned out in 2010 and 2012. <br />- NPDESI3. Construction of this pond was completed in December 2003. It <br />first began discharging on March 14, 2005. Average flow this year was <br />0.0042 cfs, which was 470 less than the historic (2005-2014) average <br />value, 0.0089 cfs. The timing of when flow values are collected affects <br />these averages. The TDS trend is increasing. <br />- NPDESI4. Construction of this pond was completed in September 2001. <br />It discharged for the first time on April 4, 2006. The average flow this <br />year was 0.0011 cfs, which was 93% less than the historic (2006-2014) <br />average value, 0.0165 cfs. The timing of when flow values are collected <br />affects these averages. TDS values are slightly increasing. However, the <br />peak value occurred in 2011. <br />- Site YSS2. This site exists on Sage Creek below all potential Yoast <br />Mine discharges. Monitoring at this site was resumed in 1998 after the <br />monitoring requirement was discontinued in 1993 (although field <br />parameters were occasionally collected in 1994 to 1997). A statistical <br />summary of baseline chemistry data is provided in Appendix D1 of the <br />10 <br />