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After their review of last year's Yoast ARR, the COMG made eewral comments that are <br />incorporated into thin yeaz's AHR9. The first comment roe about updating the ground and • <br />surface water standards tables presented in Tables 5 and 9. SCC reviered the new Colorado <br />Depaztment of Neal th's (CDOH) gtandazdn and compared them to the AAR tables. No ranges <br />were made to the AHR tables since the updated CDOH regulations did not change any <br />applicable standards. <br />The second comment was about the excursions of certain ground rater quality vas standards <br />that were reported in the AHR. Those issues are die cu9sed in Na following ''Ground Na ter <br />quality'' section. <br />The third comment roe about the applicability of certain surface rater use standards used <br />rn the AHR. Tables 9 and 30 have been revised to more cleazly define the standazda used. <br />The fourth cowmen! was about TDS values in rho Grassy Crack and Amend Draw alluvium. <br />Those is sues are diacueaed in the following "Ground rater Summary". <br />The fifth comment rill be answered here. This comment requested information as to why the <br />TDS values observed at Sage Creek alluvial relle YSAL3 and B exceeded the PHC (Probable • <br />Hydrologic Consequences, Tah 17) predicted value of 798 mg/1. This is the predicted value <br />at well YSAL1, the furthest downstream of the Yoast gaga Creak alluvial wells. The <br />Division is correct that the TDS values at YSAL3 and 8 aze higher than 798 mq/1. This is <br />due to the natural variability of alluvial water quality in the area. However, since the <br />Yoaat PHC used data from YSAL1 for its modeling, only data from that well should be <br />conaidared in determining the accuracy of the PHC prediction. TRerefore, SCC believes <br />that a revision of the Yoast PHC i9 not necessary. <br />ThB la9i CO~IIt wag abOUt TDS w1nB9 reported at eurfaCB water Site YSGS. This item i9 <br />discussed in the "Surface Water Summary" section of this AHR. <br />Meieorolooical Data <br />No meteorological data ie collected at the Yoaet Mine. SCC maintains a weather station <br />(rind speed and di ree tion, temporatura and precipitation) at its adjacent Seneca II-W <br />Mine. The reader is ceferred to that AHR, s~~n:~ H. SCC also maintains a precipitation <br />• <br />2 <br />