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• Energy Fuels and storage rights will be transferred to Sedimentation <br />Pond A planned in ECIm-an Park (See Section 780.21 for further discussion <br />of water rights). <br />Sub-Irrigation. In order to evaluate the possibility of sub-irrigation <br />from ground water in the study area, a system of 28 shallow wells was <br />installed to form transects crossing the valley at 7 locations. The <br />wells were installed in backhce pits to facilitate soil sampling and <br />detailed logging of unconsolidated materials, and were censtructed with <br />perforated PVC casing to enable water monitoring and sampling. The logs <br />of the backhce pits are presented in Exhibit 8, Drill Hole Logs. Litho- <br />logic data from these logs were used in constructing the Eckman Park <br />Stream charmel Cross Sections (Map 51). <br />• Observations were made during the digging of the backhce pits, <br />including depth of soil and root zone; type of alluvial material; and <br />water inflow to the pit. No soil mottling or other evidence of periodic <br />ground water fluctuation into the root zone was observed. With the <br />exception of a few isolated sand and gravel deposits, the channel fill is <br />predominately tight, sticky clay. The clayey alluvium in the study area <br />was found to be nearly impermeable, because when the digging exposed a <br />gravel layer, the water level in the pit suddenly rose several feet. <br />This indicates that while the gravel deposits are saturated and transmit <br />confined water when excavated, the impermeable clay surrounding the <br />gravel effectively prevents these deposits from transmitting water to or <br />from the overlying stream arri root zone. This fact is also reflected in <br />the transect well water levels and the low water table shown on Table <br />105, Hydrographs of Transect wells in Eckman Park Drainage 1979; Figure 44, <br />785-9(i) <br />