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8.b) Tiller 2008-2014 hydrograph with threshold_newGROUNDWATER ELEVATIONS AND EXCAVATION THRESHOLD 5/2008- 10/09/14 TILLER MINE SCANDIA, MINNESOTA 930.00 920.00 0116 117 in 900.00 E M r- .2 890.00 to d W 880.00 870.00 860.00 , 7 57, 7 A, 7 Q, 7 Q, 7 57, 7 St, 7 A, 7 its 7 St, 7 0�7 77 0�7 77 0�7 72i 0�7 7S 0�7 757 0�7 7R 0�7 7S 0�7 76 0�7 7> 0,7 006 �O� 7�0, X08 7�OS OQ `�/Oy X70 v'�70 �j7 s7�77 X72 R�7�, /7up s-7�, �.7 6-7St '7S ��75 Date ♦ PZ -4 PZ -5 A MW -1 0 MW -2 (aband. June 2011) x PZ -6 Prod Well PZ -3 Pond Note: Anomalous water level measurements in PZ -6 on May 12, 2014 and PZ -3, PZ -5, and PZ -6 on June 18, 2014 presumed to be measurement error per communication with Tiller staff. 50 Feet Excavation cannot go greater than 50 ft below the lowest water table elevation (915.87 ft amsl) measured in PZ -4 in 2008, which is the baseline established in the groundwater protection plan. This threshold elevation was calculated at 865.87 ft amsl based on the October 30, 2008 PZ -4 water level measurement. V 865.87 feet amsl 860.00 , 7 57, 7 A, 7 Q, 7 Q, 7 57, 7 St, 7 A, 7 its 7 St, 7 0�7 77 0�7 77 0�7 72i 0�7 7S 0�7 757 0�7 7R 0�7 7S 0�7 76 0�7 7> 0,7 006 �O� 7�0, X08 7�OS OQ `�/Oy X70 v'�70 �j7 s7�77 X72 R�7�, /7up s-7�, �.7 6-7St '7S ��75 Date ♦ PZ -4 PZ -5 A MW -1 0 MW -2 (aband. June 2011) x PZ -6 Prod Well PZ -3 Pond