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25 <br /> In this region, where crystalline rock is the norm, C.J. Corvette explained that air rotary <br /> drilling is used. He said it is like an upside-down ballpoint pen with a hammer that pounds while <br /> rotating, using air to lift rock cuttings out. This is different from mud rotary used in coastal areas. <br /> Chart #1: <br /> z5rt(.5- <br /> u[ 4 11 <br /> C.J. Corvette used the illustration in chart #1 to show that casings function as straws, <br /> getting past soils to access beneath the crystalline rock, with grout surrounding it to prevent <br /> contamination. Well videos verify construction quality, with every community well videoed to <br /> ensure standards are met. <br />