Willow Farm Hydrogeologic Characterisation The Willow Farm site investigations were undertaken between August and November 2020 under the supervision of GHD field staff. A total of 20 machine drilled bore holes were advanced to characterise the geological and geotechnical conditions over the site. All of the holes were drilled using a continuous core methodology. On completion of the borehole piezometers were installed to allow groundwater monitoring and testing. Details for the monitoring wells and recorded groundwater levels are summarised in Table 1. Table 2 provides the groundwater depths and elevations for the multi-level vibrating wire piezometer constructed at the Willow Farm Vent Shaft in borehole WNDD007. Groundwater Levels Table 1 Monitoring Well Construction and Groundwater Levels Screen Interval (m) Elevation Groundwater Depth Groundwater Elevation From To m RL m m RL WFBH001D 15.4 18.4 1170.5 13.1 1157.3 WFBH001S 8.1 11.1 1170.5 7.0 1163.5 WFBH002 5.5 6.5 1158.2 5.0 1153.3 WFBH003 9.0 15.0 1163.1 13.2 1149.9 WFBH004 3.0 6.0 1161.2 5.9 1155.4 WFBH005 1.0 3.0 1150.0 1.1 1148.9 WFBH006D 1.0 3.0 1151.0 1.9 1149.1 WFBH006S 5.0 8.0 1151.0 1.8 1149.3 WFBH007 3.0 6.0 1152.4 3.1 1149.3 WFBH008 3.6 9.6 1229.7 5.7 1224.0 WFBH009 6.5 9.5 1180.6 6.2 1174.4 WFBH010 1.4 7.4 1220.3 4.8 1215.5 WFBH011D 11.5 15.0 1233.2 7.4 1225.8 WFBH011S 4.0 7.0 1233.2 5.8 1227.4 WFBH012D 15.3 18.3 1246.5 2.4 1244.1 WFBH012S 3.0 6.0 1246.5 2.0 1244.5 WFBH013 3.0 6.0 1205.2 1.3 1203.9 WFBH0014 25.0 32.0 1200.0 8.0 1192.0 WFBH0015 9.5 15.5 1165.9 5.7 1160.2 WFBH0016 9.5 15.5 1166.2 5.3 1160.9
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