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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 0.0874 cfs, which <br />was 6% less than the historic (2000 -2011) average for Pond 012, 0.0926 <br />cfs, and was 32% less than the Pond Yl's historic (1991 -1999) flow <br />value, 0.1293 cfs. The timing of when flow values are collected affects <br />these averages. A statistical summary of baseline chemistry data from <br />Site YSSF2 (Y1 outflow) and YSS3 (Y1 inflow) is provided in Appendix D1 <br />of the 2010 AHR. NPDESI2 exhibits a recently decreasing TDS trend (SF <br />0.5), with the peak 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. This year, this pond started <br />flowing in March and stopped flowing in April. One additional flow event <br />occurred in July. Average flow this year was 0.0012 cfs, which was 870 <br />less than the historic (2005 -2011) average value, 0.0095 cfs. The taming <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 flowed in March only. The average flow this year was 0.0010 cfs, <br />which was 94% less than the historic (2006 -2011) average value, 0.0184 <br />cfs. The timing of when flow values are collected affects these <br />averages. TDS values are increasing. However, the peak value occurred in <br />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 />E3 <br />