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7.3.2 Refuse Pile Monitoring <br />Monitoring the performance of the RPE East refuse pile is deemed to be important to verify its long <br />term stability. In -situ measurements relating to deformation and groundwater characteristics can <br />provide useful information as to the refuse pile's performance and give warning of possible <br />problems. <br />Instrumentation will be placed in the refuse pile after operations have started and enough material <br />has been placed to reach design capacity grade at each of the instruments shown in the monitoring <br />plan (Appendix Q. <br />For deformation monitoring, one or more inclinometers will be placed along the refuse pile centerline <br />within the refuse pile. Additionally, mirrors will be placed on the toe buttress, refuse material, and /or <br />outside the refuse pile footprint. The advantages of mirrors are that they provide much more lateral <br />coverage than inclinometers typically provide and they can easily measure vertical deformations. The <br />disadvantages are that the precision of movement is far less than that for an inclinometer and mirrors <br />are often disturbed by animals, frost heave, and other environmental factors. <br />Groundwater monitoring will be carried out by installing piezometers to measure water pressures <br />within and possibly underneath the refuse pile. These instruments will likely consist of vibrating wire <br />piezometers or open standpipe piezometers, but a combination of the two would likely provide the <br />most comprehensive information regarding permeability and seepage conditions within the refuse <br />pile. <br />7.4 Vegetative Soil (2.05.3(5)) <br />Due to relatively steep site conditions, little true topsoil is present in the RPE East refuse pile area. <br />The uppermost soil horizon(s) of colluvial soils stripped from the refuse pile foundation area will be <br />stockpiled as vegetative soil for future reclamation needs, or will be immediately placed on the face of the <br />refuse pile as it reaches design grade as part of contemporaneous reclamation. Where occasional deep <br />soils are encountered, at least 24" of the upper soil horizons will be salvaged. Vegetative soil stripped <br />from the RPE East area may be temporarily stored in live soil staging areas but will be primarily <br />stored for future use in stockpiles located in more gently sloping areas west of the RPE East as <br />shown on drawing C -05 (the North RPEE Soil Storage Area or the South RPEE Soil Storage Area), <br />Revised July 21, 2011 P45 <br />PAMp1s \06 CO \26 \06261003 RPE E Permit Mod Support \WorkFiles \Permit Application \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127 doc 36 <br />