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26 <br /> 1 Slide #15 <br /> ARMU, <br /> Public Supply Well Construction <br /> • Casing to seal off surf icial aquifer <br /> f_ 1 <br /> 3 Slide #16 <br /> AF,M <br /> VDtf O Pf f O W CF MaHOfwfxY.K <br /> Public Supply Well Construction <br /> • Open-hole rock bore or gravel- <br /> walled well 0 8 1: <br /> 5 C.J. Cornette said screens (like the picture on the left of slide #16) are put in place to <br /> 6 prevent sand and other natural sediments from falling into the well and water supply. The middle <br /> 7 picture shows a fracture in crystalline rock. He said these are hard, solid fractures that operate <br /> 8 as pipes flowing sideways through the ground that allows water to be pulled through into the <br /> 9 pump and up and out of the system. <br />