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Ground Water Points of Compliance <br />Two GWPOC's have been established for the Yoast Mine. Attachment 15 -1 of <br />the Yoast Mine PAP provides the details. The ground water standards for <br />Grassy Creek Alluvial Well SGAL70 are provided in this AHR on Table 7. <br />Data from Well SGAL70 may be found in the Peabody Sage Creek Mine AHR, <br />Appendix C. No exceedances of those standards were observed the sample <br />collected from this well this year. <br />The ground water standards for Sage Creek Alluvial Well YSAL3 are <br />provided in this AHR on Table 8. Data from Well YSAL3 may be found in <br />Appendix C of this AHR. No exceedances of those standards were observed <br />on the sample collected from this well this year. <br />Ground Water Summary <br />TDS trends are decreasing at four wells, increasing at three wells, and <br />recently stable at two wells. CDPHE agricultural ground water standards <br />were exceeded for pH only at one well, YWCU33. In the area surrounding <br />Yoast, ground water is not being pumped for irrigation or livestock <br />watering purposes, nor has the CDPHE classified any aquifer in this <br />region for any use. The above discussion is provided only to serve as a <br />comparative basis to judge ground water quality. <br />In the Probable Hydrological Consequences (PHC, Tab 17, Attachment 17 -5) <br />section of the Yoast Mine PAP, predictions were made as to the expected <br />TDS increases to be observed at various monitoring wells. The following <br />table outlines these predictions along with this year's observed average <br />values (annual average for bedrock wells, May - September average for <br />alluvial wells). <br />Well Predicted TDS values (mg /1) This years average TDS (mg /1) <br />YOV30 3201 2820 <br />YW30 2570 7475* <br />YWC33 2721 302 <br />YAAL14 2036 3050* <br />19 <br />