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these averages. A statistical summary of baseline chemistry data from <br />Site YSSF2 (Yl outflow) and YSS3 (Y1 inflow) is provided in Appendix Dl. <br />NPDESI2 exhibits a recently decreasing TDS trend (SF 0.5), with the peak <br />value occurring in July 2007. <br />A slide north of Pond 012 remains was repaired this year. An additional <br />pond, 012A, was constructed in August 2008 to compensate for the lost <br />capacity in Pond 012. <br />- NPDESI3. Construction of this pond was completed in December 2003. It <br />first began discharging on March 14, 2005. This year, this pond started <br />flowing in April and stopped flowing in May. One additional flow event <br />occurred in June. Average flow this year was 0.0028 cfs, which was 69% <br />less than the historic (2005-2010) average value, 0.0093 cfs. The timing <br />of when flow values are collected affects these averages. The TDS trend <br />is increasing. <br />- NPDESI4. Construction of this pond was completed in September 2001. <br />It discharged for the first time on April 4, 2006. This year, this pond <br />started flowing in April and stopped flowing in May. One additional flow <br />event occurred in June. The average flow this year was 0.0069 cfs, which <br />was 61% less than the historic (2006-2010) average value, 0.0176 cfs. <br />The timing of when flow values are collected affects these averages. TDS <br />values are increasing. <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. Its TDS <br />plot indicates a stable trend (SF 0.5), with the peak value occurring in <br />September 2006. <br />Grassv Creek / Annand Draw <br />• <br />9