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li <br />i • <br />~J <br />a more appropriate standard would be 10 mg/1 (EPA, 1976). This year, no <br />well displayed a value higher than 1.05 mg/1. <br />Ground Water Summary <br />TDS trends are decreasing at one well, stable at four wells, and <br />increasing at twelve wells. CDOH agricultural ground water standards for <br />fluoride, iron and manganese were exceeded at certain monitoring wells. <br />In the area surrounding Yoast, ground water is not being pumped for <br />irrigation or livestock watering purposes, nor has the CDOH classified <br />any aquifer in this region for any use. The above discussion is provided <br />only to serve as a 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 t0 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 <br />YOV28 <br />YOV29 <br />YOV30 <br />YW28 <br />YW29 <br />YW30 <br />YWU29 <br />YWi730 <br />YWC33 <br />YAAL14 <br />YGAL15 <br />YGAL16 <br />YSAL1 <br />Predicted TDS values (mg/1) <br />2587 <br />3201 <br />3201 <br />3045 <br />2570 <br />2570 <br />2670 <br />2670 <br />2721 <br />2036 <br />3548 <br />1296 <br />798 <br />This years average TDS (mg/1) <br />aoo <br />Dry <br />1230 <br />950 <br />530 <br />770 <br />640 <br />1160 <br />850 <br />2820 <br />5350 <br />1130 <br />730 <br />8 <br />