topographic contours within the limits of the landslide as shown in Fig. 2 depict the topography of the body of the landslide in 2012 after the geomorphic expression of the slope failure had been altered by toe cuts, pioneered access routes for the subsurface exploration equipment in addition to activities related to the soil nail wall construction along the landslide’s headscarp. The sur- veyed topographic contours from the July 2011 topographic survey conducted by Westfall were superimposed to the area of the water tank and its cut bench. The survey was performed after the failure but before the subsurface exploration took place to show the extent and magnitude of cut associated with the water tank construction.
Although this noted level bench and associated cut slope had been displaced northward as the landslide moved downslope, their relative measurements and gradients remained largely intact.
Beyond the western landslide margin of the landslide to the west, the toe of the slope abutting the created level area where the sheds and planters are situated has been cut steeply to a near- vertical gradient that varied in vertical height from about 0.9 m to 2.4 m. A concrete stairway that was cut ascending the slope is present abutting the northwest corner of the landslide at the western landslide margin. Near mid-height of the slope to the west of the landslide, another cut bench that measured up to about 6.1 m