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• 6.0 - MONITORING PROGRAM <br />6.1 Stability Monitoring <br />As shown on Drawing No. MG-R-C-001, a total of 4 open tube <br />piezometers will be installed during the initial stages of the <br />construction. Piezometers P-1 and P-4 will be installed at the <br />beginning of construction operation. These piezometers will be <br />utilized to monitor for water level on a quarterly basis. The <br />piezometers will be installed in both the refuse material and <br />colluvium. A piezometer will consist of four inch diameter PVC <br />' pipe, perforated at the bottom. A typical installation detail <br />has been presented in the previously submitted application (p. <br />~ • 56). <br />In addition to piezometers, it is planned to install surface <br />monuments which will be located downslope of the refuse pile <br />area. The locations of these monuments are shown on Drawing <br />No. MG-R-C-001. The monuments will consist of driving steel <br />rods to a sufficient depth so that they will remain. stable with <br />the surface soils. A survey record will be kept as to their <br />horizontal location and elevation. Measurements will initially <br />be taken on a monthly basis during the spring and summer months <br />and frequency of measurements will be adjusted based upon the <br />observations and the pile construction. <br />• <br />-26- <br />