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Figure 6. MW-7 Well Completion, Depth to Groundwater, and Water Quality <br /> • MW-7 completed within sandstone and shale bedrock <br /> • Greater contribution of water from shale with greater depth to groundwater <br /> • Groundwater in shale may have different composition than in overlying sandstone <br /> M W-7 <br /> Sodium and Sulfate versus Depth to <br /> a� aA Cased Groundwater <br /> 0 0 -�--- --� Interval 350 2500 <br /> 0 0-42 ft bgs 300 • • <br /> 2000 <br /> UO O 250 S • <br /> Screened E 1500 <br /> I 200 • <br /> --- ---- Interval 3 v <br /> 17-42 ft bgs c 150 • 1000 <br /> N • � <br /> 100 • N <br /> 500 <br /> � 50 i <br /> _N <br /> 00 Silica Sand 22 23 24 25 26 <br /> Backfill Depth to Groundwater(feet) <br /> m 42-70 ft bgs <br /> •Sodium *Sulfate <br /> ARCADIS <br />