Geophysical surveys for assisting in determining the ground water resources at the Kaupulehu, Puaa, and Keauhou project areas, Island of Hawaii

Abstract

"The main objective of the geophysical surveys at the Kaupulehu Project-Area 1 was to determine if high-level ground water occurs at locations above Highway #190. A ground water damming structure has been mapped by previous TDEM surveys near the Puaa Project-Area 2 at locations both north and south of the property, and the objective of the geophysical at Puaa survey was to determine if high-level ground water occurs above Highway #180 on the property. A main ground water damming structure (parallel to the coast line) is inferred to occur in the Keauhou Project-Area 3 and recent drilling results indicate that secondary damming structures may exist within the region above the main damming structure. The primary objective at the Keauhou Project Site was to test several different geophysical methods to attempt to map the position of the secondary damming structure(s). There are significant cultural features (power lines, pipelines, houses, etc.) in the Keauhou area. These features are known to significantly affect many geophysical methods, in particular, electrical and electromagnetic methods such as TDEM and also magnetic methods. Another objective of the survey in the Keauhou area was to test geophysical methods for their applicability in built-up (cultural) areas."