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"I a well used to supply potable water dug or bored well casings must be of water-tight concrete, tile, or galvanized or corrugated metal pipe to a minimum distance of 10 feet (3048 mm) below the ground surface. Where the water table is more than ___________ below the ground surface, the water-tight casing shall extend below the table surface. A. 10 feet (3048 mm) B. 20 feet (6096 mm) C. 50 feet (15 240 mm) D. 100 feet (30 480 mm)!"
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