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Groundwater Exploration

GD-10 system deployed for underground water detection in California (USA).The 2D ERI Pseudo-Section of two different array proves the uniformity of the resisivity value.

* Both ERI array configurations show consistent geologic features with elucidation of a pair of lenticular channel bodies within the Mehrten formation volcaniclastic horizons, located at depths between 100-240 feet deep, which correspond well to the electric log for Test Well #1, located to the left as indicated. The Mehrten Formation channel located to the southeast (right) side of the image on both arrays has apparent resistivity values approaching 100 ohm-meter near its core, which is consistent with a sandy gravel filled channel. Such gravel bearing channels in the Mehrten Formation tend to have the highest ground water yields and a proposed test well is located in the channel axis as indicated at electrode station #41.

* Both ERI array configurations show consistent geologic features with elucidation of a sandstone layer within the Mehrten Formation, located at depths between 100-220 feed deep, located on the east(right) side of the profiles. The Mehrten channel sandstone imaged on the profiles has apparent resistivity values between 45-90 ohm-meter (dart green to orange) consistent with a sandstone. A "low resistivity anomaly" caused by groundwater in fractures, bisects the channel between electrode stations 41-43 (between vertical blue lines) and corresponds to a joint fracture zone located within Dry Creek (heavy yellow line on aerial photo).