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All surface water data collected during this reporting period are ,• <br />provided in Appendix D. Data for each site begins with a flow hydrograph <br />of all historic data (plus an annual hydrograph for NPDES sites), <br />followed by a listing of individual water quality and quantity data for <br />the current water year, followed by remarks if present. This is <br />followed by a TDS regression plot using the LOWESS method (see the <br />Ground Water Quality section), and a listing of historic percent <br />milliequival ent values for major ions and TDS values. A statistical <br />report representing baseline (i.e., premining) data for each site <br />downstream of mining (when available) is provided in Appendix D1. On <br />this statistics report, "censored data" refers to analytical values that <br />were below the detection limit, which were censored from the <br />min/max/mean calculations. The time frame for baseline conditions is <br />listed under "conditions specified" at the bottom of each page. <br />Sage Creek <br />- Site YSSF3. This site exists on Sage Creek upstream of all potential <br />Yoast Mine discharges. Its flow hydrograph indicates the lowest peak <br />flow since 1994 occurred this year. <br />- NPDESI4. Construction of this pond was completed in September 2001. <br />No discharge has occurred yet. <br />- NPDESI2. Reconstruction of the water augmentation Pond Y1 (Site <br />YSSF2) was completed on September 13, 1999. It is now referred to as <br />Pond 012 (NPDESI2). This pond began to £low again (after reconstruction) <br />in April 2000. Average flow in 2000 was 0.089 cfs, in 2001 it was 0.060 <br />cfs and in 2002 it was 0.059 cfs. The flow value this year was 898 of <br />the historic value for Pond 012, but only 46~ of Pond Y1's historic <br />(1991-1999) flow value, 0.129 cfs. A statistical summary of baseline <br />chemistry data from Site YSSF2 (Yl outflow) and Y553 (Y1 inflow) is <br />provided in Appendix D1. NPDESI2 exhibits an increasing TDS trend. <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 /> <br />• I <br />10 <br />