Landfill Closure of the Old Waste Calcining Facility (original) (raw)
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This annual Neutron Soil Moisture Monitoring report provides an analysis and summary for site inspections, meteorological information, and neutron soil moisture monitoring data obtained at the Area 23 Hazardous Waste Trenches Resource Conservation and Recovery Act (RCRA) unit, located in Area 23 of the Nevada Test Site, Nye County, Nevada, during the October 1997-October 1998 period. Inspections of the Area 23 Hazardous Waste Trenches RCI&4 unit are conducted to determine and document the physical condition of the covers, facilities, and any unusual conditions that could impact the proper operation of the waste unit closure. Physical inspections of the closure were completed quarterly and indicated that the site is in good condition with no significant findings noted. An annual subsidence survey of the elevation markers was conducted in July 1998. There has been no subsidence at any of the markers since monitoring began six years ago. The objective of the neutron logging program is to monitor the soil moisture conditions along 30 neutron access tubes and detect changes that maybe indicative of moisture movement at a point located directly beneath each trench.
1998
The subsidence survey and visual inspections have detected no subsidence in the closure cap. q Both the Baseline Difference and Cumulative Residual data indicate dry stable conditions for all quarterly monitoring periods. The Residual Raw Neutron Counts remain below the compliance Action Level of 200 counts in the period from October 1996 through October 1997. q The closure is in compliance and performing as designed. RECOMMENDATIONS q Although not within a compliance interval or of regulatory concern, the drying trend observed in the bentonite seal arid sloughed soils beneath the cement well head protection plug will continue to be monitored to determine if the trend represents a void or drying trend within this material.