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Note the abrupt deviation from the "zero" displacement line in Figure 4 <br />above at an approximate depth of 68 feet. This shows that the ground <br />above 68 feet is moving relative to the ground below this point, and the <br />abrupt jump in displacement signifies a rather well-defined plane or zone <br />of movement at this depth. The implication of this graph is that the mass <br />of earth above a depth between 67 and 69 feet has moved uniformly <br />downslope approximately 0.3 inch since the baseline inclinometer reading. <br />The rate of movement can be quantified by comparing the monitoring <br />dates to their respective deformation readings. <br />At large displacements the inclinometer casing may shear, thus ending its <br />use as a monitoring instrument. <br />The frequency of subsequent readings depend on the requirements of <br />each project and rate of movement. Typical monitoring frequencies range <br />from weekly to one every three months. <br />Inclinometers I GE?TECt?I Page 5 of 5