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<br /> <br />OC2232 <br /> <br /> <br />Moore and ~ood- 8 <br />Oral - GSA <br /> <br />. <br /> <br />The relation of the valley fill to the bedrock is <br />shown on this idealized north-south cross section of the <br /> <br />valley. The permeability of the valley fill is as many <br /> <br />times that of the bedrock, and, therefore, the bedrock <br /> <br />acts as a barrier to the downward movement of water. <br /> <br />Wells tapping the valley-fill aquifer yield as much as <br />3,000 gallons per minute but the average yield is about <br />600 gallons per minute. <br />Well data were collected to define the physical <br />character of the aquifer. Where there were no wells <br />or.where data were lacking, .test holes were augered. <br />. Observation wells were installed in places where <br />additional water-table control was needed. Water-table, <br />bedrock-contour, saturated-thickness, and depth-to-water <br />maps were constructed from the field data. In addition, <br />pumping tests were made to determine the transmissibility, <br />and specific yield of the aquifer. <br /> <br />. <br /> <br />L <br /> <br />o <br />