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• according to irrigation water criteria (Hagan, 1967). Salt concentration <br />in the soil would be expected to be excessive in areas of shallow water <br />depths where evaporation occurs. Salt evaporates can be observed in some <br />areas of the potential AVF sites. <br />Water level data for the wells are given in Table 2.7-22 for each well and <br />in the pump test tables. Depth to water levels in this area are shallow. <br />The depth to water level in all of the fill areas, which is shown on Map <br />M35A is probably less than 20 feet. Water levels in a portion of each aquifer <br />system are probably less than ten feet. Asub-irrigation potential exists <br />for alfalfa in all areas of fill and exists in some areas for crops such as <br />wheat. A significant water level rise in the Flume and Pyeatt aquifers <br />occurred between August and October. These rises are thought to be caused <br />• by rains during this period. Shallow ground-water systems are expected to <br />have a fairly large water level change yearly because these systems are <br />readily influenced by recharge and discharge. Map M32 shows the piezometric <br />surface for the sandstone above the G coal (Second SJhite Sandstone). This <br />piezometric, line is extended into the Lewis Shale because this sandstone <br />and Lewis Shale are thought to be connected in this area. A piezometric <br />surface is shown for the Third White Sandstone (SS below the G coal) on the <br />cross-section. This surface is based on the water level in well P-8 and the <br />expected gradient of the aquifer in this area. The Third and Second White <br />Sandstones are not believed to be connected hydrologically. The piezometric <br />surface between wells P-8 and P-5 would be flatter than the surface between <br />wells P-5 and P-4 if the two sandstones are readily connected. <br /> <br />2-574 <br />~_ <br />