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• <br />• <br />EXHIBIT 2 - Continued <br />presented in three units of measurement: 1) PCF, pounds water per cubic <br />foot soil; 2) g/cc, grams water per cubic centimeter soil; and 3) % <br />vol., percent volume by weight. The nuclear gauge was standardized at <br />each location before the readings were taken.' <br />Soil moisture conditions, and the extent of the capillary fringe in <br />• <br />• <br />particular, depend on the lithology and characteristics of the alluvium <br />containing the water table. Clay materials are capable of high moisture <br />retention, while an aggregate has almost no retention capability, because <br />of the difference in porosity of the two materials. Thus, the capillary <br />fringe in alluvium consisting of clay will extend farther above the water <br />table than that of alluvium consisting of gravel. In addition, the <br />interface between one lithology and another within the alluvium has an <br />effect on moisture content. The interface between the A and B soil <br />horizons can also affect the amount of moisture available within the root <br />zone. <br />To document the above effects on soil moisture, information on <br />• <br />• <br />topsoil thickness, root depth, and water table elevation from nearby <br />alluvial wells was analyzed along with the data collected from the <br />neutron probe access tubes. The location of the alluvial wells is shown <br />on Map 4, Mine No. 3 Hydrology. All of the above information is <br />graphically presented in this Exhibit in Figure 2, Neutron Probe Access <br />Tube Moisture Logs. The raw data collected were interpreted considering <br />site-specific conditions of lithology, topsoil, roots and alluvial water. <br />