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water quality well, YOV29, was dry. CDPHE agricultural ground water <br />standards for pH, fluoride and iron were exceeded at, certain monitoring <br />wells. In the area surrounding Yoast, ground water is not being pumped <br />for irrigation or livestock watering purposes, nor has the CDPHE <br />classified any aquifer in this region for any use. The above discussion <br />is provided only to serve as a comparative basis to judge ground water <br />quality. <br />• <br />In the Probable Hydrological Consequences (PHC, Tab 1.7, 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 (mq/1) <br />YOV28 2587 <br />YOV29 3201 <br />YOV30 3201 <br />YW28 3045 <br />YW29 2570 <br />YW30 2570 <br />YWU29 2670 <br />YWU30 2670 <br />YWC33 2721 <br />YAAL14 2036 <br />YGAL15 3548 <br />YGAL16 1296 <br />YSAL1 798 <br />YSAL3 798 <br />* indicates value above prediction <br />This years averaqe TDS (mq/1) <br />870 <br />Dry <br />2040 <br />900 <br />470 <br />6750* <br />430 <br />790 <br />840 <br />3125* (2980* calculated) <br />4975* (4635* calculated) <br />1440* (1350* calculated) <br />1420* (1345* calculated) <br />1160* (1140* calculated) <br />At Annand Draw alluvial well YAAL14, the average TDS value observed this <br />year was 3125 mg/1. This value exceeds the predicted value of 2036 mg/1. <br />The PHC predictions are based on long-term average values. Individual <br />TDS measurements will vary from year to.year due to climatic conditions. <br />7