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26 <br /> Slide #15 <br /> AKM , <br /> Public Supply Well Construction <br /> • Casing to seal off surficial aquifer <br /> l / <br /> 1 <br /> Slide #16 <br /> ARM <br /> Public Supply Well Construction <br /> • Open-hole rock bore or gravel- <br /> walled well 0®r: .2 . <br /> C.J. Corvette said screens (like the picture on the left of slide #16) are put in place to <br /> prevent sand and other natural sediments from falling into the well and water supply. The middle <br /> picture shows a fracture in crystalline rock. He said these are hard, solid fractures that operate as <br /> pipes flowing sideways through the ground that allows water to be pulled through into the pump <br /> and up and out of the system. <br />