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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 /> v aA Cased Groundwater <br /> p - Interval 350 2500 <br /> Ln 4- 0-42 ft bgs 300 • <br /> O • • 2000 <br /> cn O Joao 250 S <br /> Screened E 200 1500 <br /> • <br /> Interval E <br /> 17-42 ft bgs o 150 • l000 <br /> N • • � <br /> 100 <br /> V) 500 <br /> 50 <br /> 0 • 0 <br /> O Silica Sand 22 23 24 25 26 <br /> V) r\ <br /> o Backfill Depth to Groundwater (feet) <br /> m 42-70 ft bgs •Sodium •sulfate <br /> '' ARCADIS <br />