Massiot, C.; Boyes, A.F.; Viskovic, G.P.D. 2026 Groundwater measurements of geotechnical bore holes associated with the second Mount Victoria Tunnel, Wellington. Lower Hutt, NZ: Earth Sciences New Zealand. GNS Science report 2026/03. 9 p.; doi: 10.21420/TS85-HW38
Abstract
Groundwater temperature logging was undertaken in geotechnical borehole BH101B for the second Mount Victoria Tunnel project in Wellington in January 2026. Measurements were made using a HOBO U12-015 stainless steel temperature-data logger lowered into the borehole with controlled stationary equilibration at selected depths. The groundwater temperature was uniform throughout the measured interval, with an average value of 14.4 ± 0.1°C. No thermal gradients or anomalies were observed, indicating stable groundwater conditions. The results demonstrate that simple downhole temperature logging provides reliable information to support geotechnical investigations (auths)
