Laserfiche WebLink
discussion is provided only to serve as a comparative basis to judge <br />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) <br />YOV30 3201 <br />YW30 <br />YWC33 <br />YAAL14 <br />YGAL16 <br />YSAL1 <br />2570 <br />2721 <br />2036 <br />1296 <br />798 <br />YSAL3 798 <br />* indicates value above prediction <br />This years average TDS (mg /1) <br />2220 <br />7030* <br />770 <br />3090* <br />1490* <br />2100* <br />1290* <br />At Annand Draw alluvial well YAAL14, the TDS value observed this year <br />was 3090 mg /l. This value exceeds the predicted value of 2036 mg /l. The <br />GWPOC well for the Grassy Creek Alluvium (downstream of Annand Draw), <br />SGAL70, did not exceed the TDS GWPOC standard, 5038 mg /1. <br />At Grassy Creek alluvial well YGAL16, the TDS value observed this year <br />was 1490 mg /l. This value exceeds the predicted value of 1296 mg /l. The <br />GWPOC well for the Grassy Creek Alluvium, SGAL70, did not exceed the TDS <br />GWPOC standard, 5038 mg /1. <br />At Sage Creek alluvial well YSAL1, the TDS value observed this year was <br />2100 mg /l. The TDS value observed this year upstream at Well YSAL3 <br />(directly below Pond 012) was 1290 mg /1. These two values exceed the <br />predicted value of 798 mg /1. The GWPOC well for the Sage Creek Alluvium, <br />YSAL3, did not exceed the TDS GWPOC standard, 2675 mg /1. <br />C <br />